wip

2025-10-06 19:59:41 +07:00 · 2019-12-02 13:18:50 +01:00
323 changed files with 98188 additions and 51752 deletions
@@ -1,27 +0,0 @@
 # This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
 name: Node.js CI
 on:
  pull_request:
    branches: [ master, owl-next ]
 jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [12.x, 14.x, 16.x]
    steps:
    - uses: actions/checkout@v2
    - name: Use Node.js ${{ matrix.node-version }}
      uses: actions/setup-node@v1
      with:
        node-version: ${{ matrix.node-version }}
    - run: npm install
    - run: npm run test
    - run: npm run check-formatting
@@ -15,7 +15,6 @@ yarn-debug.log*
 yarn-error.log*
 package-lock.json
 yarn.lock
 #ide's
 .vscode
@@ -24,11 +23,4 @@ yarn.lock
 node_modules
 # Extras temp file
-/tools/owl.js
+/tools/owl.js
 release-notes.md
 .rpt2_cache
 # useful in some cases
 /temp
@@ -1,612 +0,0 @@
 # Changelog
 This document contains an overview of all changes between Owl 1.x and
 Owl 2.x, with some pointers on how to update the code.
 Note that some of these changes can be magically implemented (for example, by
 patching the `setup` method of `Component` to auto register all the lifecycle
 methods as hooks). This will be done for the transition period, but will be
 removed after.
 ## Changes
 **Components**
 - components can now have empty content or multiple root nodes (htmlelement or text) ([details](#31-components-can-now-have-arbitrary-content))
 - new `useEffect` hook
 - new `onDestroyed`, `onWillRender` and `onRendered` hooks
 - breaking: lifecycle methods are removed ([details](#1-component-lifecycle-methods-are-removed))
 - breaking: can no longer be mounted on detached DOM ([details](#2-components-can-no-longer-be-mounted-in-a-detached-dom-element))
 - breaking: standalone `mount` method API is simpler ([details](#4-mount-method-api-is-simpler))
 - breaking: components can no longer be instantiated and mounted by hand ([details](#5-components-can-no-longer-be-instantiated-and-mounted-by-hand))
 - breaking: components can no longer be unmounted/remounted ([details](#6-components-can-no-longer-be-unmountedremounted))
 - breaking: template name is no longer inferred from the class name ([details](#7-template-name-is-no-longer-inferred-from-the-class-name))
 - breaking: components no longer have a `shouldUpdate` method ([details](#8-components-no-longer-have-a-shouldupdate-method))
 - breaking: component.el may be a text node, and is no longer `null` ([details](#9-componentel-may-be-a-text-node-and-is-no-longer-null))
 - breaking: style/class on components are now regular props ([details](#10-styleclass-on-components-are-now-regular-props))
 - breaking: components can no longer be mounted with position=self ([details](#11-components-can-no-longer-be-mounted-with-positionself))
 - breaking: `t-on` does not work on components any more ([details](#12-t-on-does-not-work-on-components-any-more))
 - breaking: `t-component` no longer accepts strings ([details](#17-t-component-no-longer-accepts-strings))
 **Portal**
 - portals can now have arbitrary content (no longer restricted to one single child)
 - breaking: does no longer transfer dom events ([details](#13-portal-does-no-longer-transfer-dom-events))
 - breaking: does render as an empty text node instead of `<portal/>` ([details](#14-portal-does-render-as-an-empty-text-node-instead-of-portal))
 **Slots**
 - breaking: `t-set` does not define a slot any more ([details](#3-t-set-will-no-longer-work-to-define-a-slot))
 **Miscellaneous**
 - improved performance
 - much simpler code 
 - finer grained reactivity: owl 2 tracks change per key/component
 - finer grained reactivity: sub components can reobserve state
 - new App class to encapsulate a root Owl component (with the config for that application)
 - new `Memo` component
 - breaking: `Context` is removed ([details](#15-context-is-removed))
 - breaking: `env` is now totally empty ([details](#16-env-is-now-totally-empty))
 - breaking: most exports are exported at top level ([details](#18-most-exports-are-exported-at-top-level))
 - breaking: properties are no longer set as attributes ([details](#19-properties-are-no-longer-set-as-attributes))
 - breaking: `t-foreach` should always have a corresponding `t-key` ([details](#20-t-foreach-should-always-have-a-corresponding-t-key))
 - breaking: `EventBus` api changed: it is now an `EventTarget` ([details](#21-eventbus-api-changed-it-is-now-an-eventtarget))
 - breaking: `Store` is removed ([details](#22-store-is-removed))
 - breaking: `Router` is removed ([details](#23-router-is-removed))
 - breaking: transition system is removed ([details](#24-transition-system-is-removed))
 - breaking: no more global components or templates ([details](#25-no-more-global-components-or-templates))
 - breaking: `AsyncRoot` utility component is removed ([details](#26-asyncroot-utility-component-is-removed))
 - breaking: `useSubEnv` only applies to child components ([details](#27-usesubenv-only-applies-to-child-components))
 - breaking: `env` is now frozen ([details](#28-env-is-now-frozen))
 - breaking: `t-ref` does not work on components ([details](#29-t-ref-does-not-work-on-component))
 - breaking: `t-on` does not accept expressions, only functions ([details](#30-t-on-does-not-accept-expressions-only-functions))
 - breaking: `renderToString` function on qweb has been removed ([details](#32-rendertostring-on-qweb-has-been-removed))
 ## Details/Rationale/Migration
 All changes are listed in no particular order.
 ### 1. component lifecycle methods are removed
 There was two ways to define hooks: the component methods (`willStart`, `mounted`, ...) and the hooks (`onWillStart`, `onMounted`, ...). In Owl 2, the component methods have been removed.
 Rationale: it makes the implementation simpler and slightly faster. Hooks are more composable
 than component methods. It enforces a single entry point to check all the useful lifecycle
 calls (instead of it being scattered in the component definition). It feels more "modern".
 Migration: lifecycle methods should be defined in the `setup`:
 ```js
 class MyComponent extends Component {
  mounted() {
    // do something
  }
 }
 ```
 should become:
 ```js
 class MyComponent extends Component {
  setup() {
    onMounted(() => {
      // do something
    });
  }
 }
 ```
 ### 2. components can no longer be mounted in a detached dom element
 Nor document fragment.
 Rationale: it is actually very difficult to do it: this implies that a component
 can be mounted more than once, that we need to check every time different status,
 that some elements is in the dom, and was a cause for bugs. Also, we don't use it
 in practice. Removing this means that we have a much simpler mental model of what
 happens.
 Migration: well, not really easy. The code needs to be refactored in a different way.
 ### 3. **`t-set` will no longer work to define a slot**
 The `t-set` directive cannot define a slot anymore. Only the `t-set-slot` directive
 can do it.
 Rationale: it was left for compatibility reason, but was deprecated anyway.
 Migration: `t-set` should be changed to `t-set-slot` (when defining a slot)
 Example:
 ```xml
 <SideBar><t t-set="content">content</t></SideBar>
 ```
 should become:
 ```xml
 <SideBar><t t-set-slot="content">content</t></SideBar>
 ```
 ### 4. `mount` method API is simpler
 Before, the `mount` method was used like this:
 ```js
 await mount(Root, { target: document.body });
 ```
 It is now simpler and takes the root component and a target argument:
 ```js
 await mount(Root, document.body);
 ```
 Rationale: the `mount` method is only useful anyway for small toy examples,
 because real applications will need to configure the templates, the translations,
 and other stuff. All complex usecases need to go through the new `App` class,
 that encapsulates the root of an owl application.
 ### 5. components can no longer be instantiated and mounted by hand
 In Owl 1, it was possible to instantiate a component by hand:
 ```js
 const root = new Root();
 await root.mount(document.body);
 ```
 Now, it is no longer possible. All component instantiations should be done by
 the owl framework itself.
 Rationale: the `mount` method does not make sense for all non root components.
 Also, the fact that it was possible for a component to be sometimes root,
 sometimes a child made for a weird constructor signature. This changes makes it
 simpler.
 Migration: all code doing that should use either the `mount` method (if the use
 case is simple enough, or the `App` class):
 ```js
 const app = new App(Root);
 app.configure({ templates: ..., ...});
 await app.mount(document.body);
 ```
 ### 6. components can no longer be unmounted/remounted
 Rationale: this is a very difficult feature to implement (it adds a lot of possible
 state transitions), compared to its benefit.
 Migration: all code using it should find a way to export and reimport the state
 ### 7. template name is no longer inferred from the class name
 Before, it was possible to define a component without specifying its template:
 ```js
 class Blabla extends Component {
    // no static template here!
 }
 ```
 with the `Blabla` template. It also worked with subclasses. But then, this means
 that the code had to look up all the super classes names to find the correct
 template.
 Rationale: in practice, it is not really useful, since all templates are usually
 namespaced: `web.SomeComponent` anyway. All the trouble to do that was just not
 worth it.
 Migration: simply explicitely defines the template key everytime:
 ```js
 class Blabla extends Component {}
 Blabla.template = "Blabla";
 ```
 ### 8. components no longer have a `shouldUpdate` method
 Rationale: `shouldUpdate` is a dangerous method to use, that may cause a lot of
 issues. Vue does not have such a mechanism (see https://github.com/vuejs/vue/issues/4255),
 because the reactivity system in Vue is smart enough to only rerender the minimal
 subset of components that is subscribed to a piece of state. Now, Owl 2 features
 a much more powerful reactivity system.
 Migration code: remove the `shouldUpdate` methods. Then, maybe the following
 ideas may help:
 - try to organize the state/architecture to minimize the number of state updates
 - take advantage of the finer reactivity system. For example, if we have a list
  of items, with a component for each item, we can write this:
  ```js
  class Item extends Component {
      setup() {
          this.item = useState(this.props.item); // and only use this, not props.item
      }
  }
  ```
  Doing so will make it that each `Item` component will register itself as an
  observer of its own item, and will be the only component being rerendered when
  its item object is updated.
 - use the `Memo` component to wrap some piece of template. `Memo` memoize its
  content, and only update itself if its props are different (shallow comparison):
  ```xml
    <Memo a="state.a" b="state.b"> 
        <t t-esc="state.a"/>
        <t t-esc="state.b"/>
        <t t-esc="state.c"/>
    </Memo>
  ```
 ### 9. component.el may be a text node, and is no longer `null`
 This comes from the fact that Owl 2 supports fragments (arbitrary content). When
 it is not defined, it was `null` in Owl 1 and is `undefined` in owl 2.
 ### 10. style/class on components are now regular props
 Before, it was possible to do this in a template:
 ```xml
 <Child style="..." class="..."/>
 ```
 (or with `t-att-style` and `t-att-class`). This does no longer work, as they are
 now considered normal props.
 Rationale: with the move to fragments, the semantics of where the style/class
 attribute should be set is unclear. Also, it is actually very hard to implement
 properly, in particular with higher order components. And another issue is that
 it (slightly) breaks the encapsulation of behaviour from the `Child` component
 perspective.
 Migration: each component that wishes to be customized should explicitely add
 the `class` and `style` attributes in its template. Also, the parent component
 should be aware that since we are talking about props, it should be a javascript expression:
 In parent:
 ```xml
 <Child class="'o_my_god'"/>
 ```
 and in child:
 ```xml
    <div t-att-class="props.class">
        ...
    </div>
 ```
 ### 11. components can no longer be mounted with position=self
 Rationale: this is due to the implementation of owl 2 virtual dom. The hack
 necessary to support position=self does not work. This position also is not
 compatible with the fact that a component can have a root `<div>` then later,
 change it to something else, or even a text node.
 Migration: no real way to do the same. Owl application needs to be appended or
 prepended in something, maybe a `div`.
 ### 12. `t-on` does not work on components any more
 In owl 1, it was possible to bind an event listener on a component tag in a
 template:
 ```xml
 <SomeComponent t-on-some-event="doSomething"/>
 ```
 This does not work any more.
 Rationale: with the support of fragments, there is no longer a canonical html
 element that we can refer. So, this makes it difficult to implement correctly
 and efficiently. Also, we noticed in practice that the event system was an issue
 in some cases, when components need to communicate before they are mounted. In
 those cases, the better solution is to directly use a callback.  Also, another
 conceptual issue with this is that it kind of breaks the component encapsulation.
 The child component kind of leak its own implementation to the outside world.
 Migration: a quick fix that may work in some cases is to simply bind the event
 handler on a parent htmlelement. A better way to do it, if possible, is to change
 the component API to accept explicitely a callback as props. 
 ```xml
 <SomeComponent onSomeEvent="doSomething"/>
 ```
 ### 13. Portal does no longer transfer DOM events
 In Owl 1, a Portal component would listen to events emitted on its portalled
 child, and redispatch them on itself. It no longer works.
 Rationale: Portal now supports an arbitrary content (so, more than one child,
 and potentially no html element), so it is already unclear what it should listen
 to. Also, redispatching events was an hack. And this changes allows the portal
 to render itself as a text node, which is nice. This is also in line with the
 fact that modern Owl moves toward using callback instead of `t-on` for communication.
 Migration: use callback if possible to communicate. Otherwise, use a sub env.
 ### 14. Portal does render as an empty text node instead of `<portal/>`
 That is pretty nice. No real migration needed.
 ### 15. Context is removed
 Context was an abstraction in Owl that was used to define some reactive state
 and to let some components subscribe to it, then only them would be rerendered
 if the context was updated. This has been removed.
 Rationale: first, the Context api and code was kind of awkward, which is a sign
 that the abstraction is not well thought. But the good news is that it is actually
 completely replaced by the new reactivity system, which is even more powerful,
 since it can tracks changes key by key.
 Migration: replace all uses of Context with the new reactivity system.
 ```js
 // somewhere, maybe in a service, or in the global env
 const context = observe({some: "state"})
 // in a component that would previously get a reference to the context:
 setup() {
    this.context = useState(context);
    // now the component is subscribed to the context and will react to any
    // change for any key read by the component, and only those changes
 }
 ```
 ### 16. `env` is now totally empty
 In Owl 1, the `env` object had to contain a QWeb instance. This was the way
 components would get a reference to their template function. It no longer works
 that way: the `env` object is now totally empty (from the perspective of Owl).
 It is now a user space concept, useful for the application.
 Rationale: first, there is no longer a QWeb class. Also, this changes simplifies
 the way components works internally.
 Migration: there is no proper way to get an equivalent. The closest is to get
 a reference to the root App using `this.__owl__.app`. If you need to do this,
 let us know. If this is a legitimate usecase, we may add a `useApp` hook.
 ### 17. `t-component` no longer accepts strings
 In owl 1, we could write this:
 ```xml
 <t t-component="Coucou"/>
 ```
 This meant that Owl would look for the component class like this: `components["Coucou"]`,
 so, essentially equivalent to `<Coucou/>`. In Owl 2, the `t-component` directive
 is assumed to be an expression evaluating to a component class:
 ```js
 class Parent extends Component {
  static template = xml`<t t-component="Child"/>`;
  Child = Child;
 }
 ```
 Rationale: it simply seems more consistent with the way directive works. Also,
 the implementation is slightly simpler.
 Migration: simply using `constructor.components.Coucou` instead of `Coucou` will
 do the trick.
 ### 18. most exports are exported at top level
 Most exports are flattened: for ex, `onMounted` is in owl, not in `owl.hooks`.
 Rationale: this makes it easier to work with, instead of importing stuff from 
 `owl`, then `owl.hooks` and `owl.tags` for example.
 Migration: all import code simply need to be slightly adapted.
 ### 19. Properties are no longer set as attributes
 Formerly, html properties `<input type="checkbox" t-att-checked="blah"/>` were
 set as property and as attribute, so, they would be visible in the DOM:
 `<input type="checkbox" checked="blah"/>`. Now, they are treated as property only:
 `<input type="checkbox"/>`.
 Rationale: this is actually simple to do, is faster, and makes more sense to me.
 ### 20. `t-foreach` should always have a corresponding `t-key`
 It was possible in Owl 1 to write a `t-foreach` without a `t-key`. In that case,
 the index was used as key.  Since it was clearly a possible bug, Owl 1 had a
 warning in some cases, when it could detect that there was definitely not a `t-key`.
 However, this was imperfect, and in some cases no warning was displayed. In Owl 2,
 the tag with a `t-foreach` has to have a corresponding `t-key`.
 Rationale: this makes it easier to avoid bugs.
 Migration: simply move the `t-key` to the tag with the `t-foreach`. If this is
 a situation where there is really not a need for a `t-key`, you can still add
 it with the `_index` suffix:
 ```xml
 <div t-foreach="items" t-as="item" t-key="item_index">
  ...
 </div>
 ```
 ### 21. `EventBus` api changed: it is now an `EventTarget`
 In Owl 1, the `EventBus` class was done manually, with a custom API. In Owl 2,
 it simply extends `EventTarget` (the native Dom class), so its implementation
 is basically only 5 lines long. This means that it has now the usual DOM interface:
 ```js
 bus.addEventListener('event-name', callback);
 ```
 Rationale: it makes it easier to have just one interface to remember, it makes
 the code simpler
 Migration: most bus methods need to be adapted. So, `bus.on("event-type", owner, (info) => {...})` has to be
 rewritten like this: `bus.addEventListener("event-type", (({detail: info}) => {...}).bind(owner))`.
 Do not forget to similarly replace `bus.off(...)` by `bus.removeEventListener(...)`
 ### 22. `Store` is removed
 The Store system had been abandoned in owl 2.
 Rationale: first, it was complicated to maintain. Second, it was not really
 used in Odoo. Finally, the new reactivity system seems to be a pretty good basis
 to write a store, and it should not take much work. Also, this can be done in
 user space (so, not necessarily at the framework level). Another point is that
 the store API was invented before the hooks, then was still a little awkward.
 Migration:
 - rewrite the code not to use a store
 - probably use the reactivity system instead and build a store class and a few
  hooks on top of it.
 ### 23. `Router` is removed
 Rationale: Router was not used that much, and it felt like it did not fit in Owl 2.
 Its API needs to be reworked, and we are not confident that it is a good
 experience to use it. Also, it can be done in userspace (it does not need specific
 integration at the framework level)
 Migration: reimport all missing piece from the code in Owl 1.
 ### 24. transition system is removed
 Rationale: this was a high ratio cost/value, with a lot of potential for bugs.
 We feel like there should be a way to reimplement in userspace the simple cases.
 Maybe something like: add a `t-ref` in the template, and define a hook `useFadeOut`
 that takes the ref, and add a fadeout class at initial render, then in mounted,
 wait for a micro tick and remove it.
 Migration: try to reimplement it manually. 
 ### 25. no more global components or templates
 It was possible in Owl 1 to register globally a component or a template. This is
 no longer the case in Owl 2.
 Rationale: first, this was a tradeoff: ease of use was gained, but at the cost
 of a higher complexity. Users had to know that there was a magic mechanism. Also,
 it was not used much in practice, and the cost of having to import manually components
 is low.  Finally, this can be mostly done in user space (for example, by subclassing
 `Component`).
 Migration: import manually all required global components, or find a way to organize
 the code to do it.
 ### 26. `AsyncRoot` utility component is removed
 Rationale: it was difficult to understand, never used, and not really useful.
 It seems better to control the asynchrony of an application by simply controlling
 how/when the state is updated, and how each component is loading/updating itself.
 Migration: remove the `AsyncRoot` component, then possibly, reorganize the code
 to fetch data in a higher order component, and using a `t-if/t-else` to display
 either a fallback when the data is not ready, or the actual component with data
 as props.  If there is no escape, and `AsyncRoot` is needed, please reach out to
 us so we can study this usecase.
 ### 27. `useSubEnv` only applies to child components
 In Owl 1, a call to `useSubEnv` would define a new environment for the children
 AND the component. It now only defines an environment for the children.
 Rationale: This was a subtle cause for bugs: some code had to be rrun
 before the call to `useSubEnv`, otherwise it could interfere with the sub environment.
 ### 28. `env` is now frozen
 In Owl 2, the `env` object is frozen. It can no longer be modified (structurally)
 arbitrarily. 
 Rationale: it seems like the `env` object purpose is to have a global channel of
 communication between components. It is however scary if anyone can add something
 to it.  The usual use case is to add something to the environment for some child
 components. This use case still works with `useSubEnv`.
 Migration: use `useSubEnv` instead of writing directly to the env.  Also, note
 that the environment given to the App can initially contain anything.
 ### 29. `t-ref` does not work on component
 Before, `t-ref` could be used to get a reference to a child component. It no
 longer works.
 Rationale: the possibility of having a ref to a child component breaks the
 encapsulation provided by Owl components: a child component now has a private
 and a public interface.  Another issue is that it may be unclear when the ref
 should be set: is the component active on setup, or on mounted? Also, it is
 kind of awkward to implement.
 Migration: the `env` and `props` should provide a communication channel wide enough:
 the sub component can expose its public API by calling a callback at the proper
 timing, or by triggering an event.
 ### 30. `t-on` does not accept expressions, only functions
 In Owl 1, it was possible to define simple expressions inline, in a template:
 ```xml
 <button t-on-click="state.value = state.value + 1">blabla</button>
 <button t-on-click="someFunction(someVar)">blabla</button>
 ```
 This does not work anymore. Now, the `t-on` directive assumes that what it get is
 a function.
 Rationale: the fact that owl 1 had to support expressions meant that it was not
 possible to properly inject the event in general. With this restriction, Owl 2
 can support more general use cases. Also, the examples above can simply be
 wrapped in a lambda function. 
 Migration: use lambda functions. For example, the two examples above can be
 adapted like this:
 ```xml
 <button t-on-click="() => state.value = state.value + 1">blabla</button>
 <button t-on-click="() => this.someFunction(someVar)">blabla</button>
 ```
 ### 31. components can now have arbitrary content
 Before Owl 2, components had to limit themselves to one single htmlelement as
 root. Now, the content is arbitrary: it can be empty, or multiple html elements.
 So, the following template works for components:
 ```xml
  <div>1</div>
  <div>2</div>
  hello
 ```
 ### 32. `renderToString` on QWeb has been removed
 Rationale: the `renderToString` function was a qweb method, which made sense because
 the qweb instance knew all templates. But now, the closest analogy is the `App`
 class, but it is not as convenient, since the `app` instance is no longer visible
 to components (while before, `qweb` was in the environment).
 Also, this can easily be done in userspace, by mounting a component in a div.  For example:
 ```js
 export async function renderToString(template, context) {
  class C extends Component {
    static template = template;
  }
  const div = document.createElement('div');
  document.body.appendChild(div);
  const component = await mount(C, div);
  const result = div.innerHTML;
  app.destroy();
  div.remove();
  return result;
 }
@@ -1,44 +1,39 @@
-<h1 align="center">🦉 <a href="https://odoo.github.io/owl/">Owl Framework</a> 🦉</h1>
+<h1 align="center">🦉 <a href="https://odoo.github.io/owl/">Odoo Web Library</a> 🦉</h1>
 [![License: LGPL v3](https://img.shields.io/badge/License-LGPL%20v3-blue.svg)](https://www.gnu.org/licenses/lgpl-3.0)
 [![npm version](https://badge.fury.io/js/@odoo%2Fowl.svg)](https://badge.fury.io/js/@odoo%2Fowl)
 [![Downloads](https://img.shields.io/npm/dm/@odoo%2Fowl.svg)](https://www.npmjs.com/package/@odoo/owl)
 _Class based components with hooks, reactive state and concurrent mode_
 **Try it online!** you can experiment with the Owl framework in an online [playground](https://odoo.github.io/owl/playground).
 ## Project Overview
-The Odoo Web Library (Owl) is a smallish (~<20kb gzipped) UI framework built by
+The Odoo Web Library (OWL) is a smallish (~<20kb gzipped) UI framework intended to
-[Odoo](https://www.odoo.com/) for its products. Owl is a modern
+be the basis for the [Odoo](https://www.odoo.com/) Web Client. Owl is a modern
 framework, written in Typescript, taking the best ideas from React and Vue in a
 simple and consistent way. Owl's main features are:
 - a declarative component system,
 - a reactivity system based on hooks,
- concurrent mode by default,
+- a store implementation (for state management),
 - a small frontend router
-Owl components are defined with ES6 classes and xml templates, uses an
+Owl components are defined with ES6 classes, they use QWeb templates, an underlying
-underlying virtual DOM, integrates beautifully with hooks, and the rendering is
+virtual dom, integrates beautifully with hooks, and the rendering is asynchronous.
 asynchronous.
-Quick links:
+**Try it online!** An online playground is available at [https://odoo.github.io/owl/playground](https://odoo.github.io/owl/playground) to let you experiment with the Owl framework. There
 are some code examples to showcase some interesting features.
- [documentation](#documentation),
+Owl is currently mostly stable.  Possible future changes are explained in the
- [changelog](CHANGELOG.md) (from Owl 1.x to 2.x),
+[roadmap](roadmap.md).
 - [playground](https://odoo.github.io/owl/playground)
 ## Example
 Here is a short example to illustrate interactive components:
 ```javascript
-const { Component, useState, mount, xml } = owl;
+const { Component, useState } = owl;
 const { xml } = owl.tags;
 class Counter extends Component {
  static template = xml`
-    <button t-on-click="() => state.value++">
+    <button t-on-click="state.value++">
      Click Me! [<t t-esc="state.value"/>]
    </button>`;
@@ -55,7 +50,8 @@ class App extends Component {
  static components = { Counter };
 }
-mount(App, document.body);
+const app = new App();
 app.mount(document.body);
 ```
 Note that the counter component is made reactive with the [`useState` hook](doc/reference/hooks.md#usestate).
@@ -65,66 +61,192 @@ But this is not mandatory, many applications will load templates separately.
 More interesting examples can be found on the
 [playground](https://odoo.github.io/owl/playground) application.
 ## Design Principles
 OWL is designed to be used in highly dynamic applications where changing
 requirements are common and code needs to be maintained by large teams.
 - **XML based**: templates are based on the XML format, which allows interesting
  applications. For example, they could be stored in a database and modified
  dynamically with `xpaths`.
 - **templates compilation in the browser**: this may not be a good fit for all
  applications, but if you need to generate dynamically user interfaces in the
  browser, this is very powerful. For example, a generic form view component
  could generate a specific form user interface for each various models, from a XML view.
 - **no toolchain required**: this is extremely useful for some applications, if,
  for various reasons (security/deployment/dynamic modules/specific assets tools),
  it is not ok to use standard web tools based on `npm`.
 Owl is not designed to be fast nor small (even though it is quite good on those
 two topics). It is a no nonsense framework to build applications. There is only
 one way to define components (with classes).
 If you are interested in a comparison with React or Vue, you will
 find some more information [here](doc/comparison.md).
 ## Documentation
-### Learning Owl
+A complete documentation for Owl can be found here:
-Are you new to Owl? This is the place to start!
+- [Main documentation page](doc/readme.md).
- [Tutorial: create a TodoList application](doc/learning/tutorial_todoapp.md)
+The most important sections are:
 - [How to start an Owl project](doc/learning/quick_start.md)
 - [How to test Components](doc/learning/how_to_test.md)
 - [How to write Single File Components](doc/learning/how_to_write_sfc.md)
-### Reference
+- [Tutorial: TodoList application](doc/learning/tutorial_todoapp.md)
-
+- [QWeb templating language](doc/reference/qweb_templating_language.md)
 You will find here a complete reference of every feature, class or object
 provided by Owl.
 - [Animations](doc/reference/animations.md)
 - [Browser](doc/reference/browser.md)
 - [Component](doc/reference/component.md)
 - [Content](doc/reference/content.md)
 - [Concurrency Model](doc/reference/concurrency_model.md)
 - [Configuration](doc/reference/config.md)
 - [Context](doc/reference/context.md)
 - [Environment](doc/reference/environment.md)
 - [Event Bus](doc/reference/event_bus.md)
 - [Event Handling](doc/reference/event_handling.md)
 - [Error Handling](doc/reference/error_handling.md)
 - [Hooks](doc/reference/hooks.md)
 - [Mounting a component](doc/reference/mounting.md)
 - [Miscellaneous Components](doc/reference/misc.md)
 - [Observer](doc/reference/observer.md)
 - [Props](doc/reference/props.md)
 - [Props Validation](doc/reference/props_validation.md)
 - [QWeb Templating Language](doc/reference/qweb_templating_language.md)
 - [QWeb Engine](doc/reference/qweb_engine.md)
 - [Slots](doc/reference/slots.md)
 - [Tags](doc/reference/tags.md)
 - [Utils](doc/reference/utils.md)
-### Other Topics
+Found an issue in the documentation? A broken link? Some outdated information?
 Submit a PR!
-This section provides miscellaneous document that explains some topics
+## Installing/Building
 which cannot be considered either a tutorial, or reference documentation.
 - [Owl architecture: the Virtual DOM](doc/miscellaneous/vdom.md)
 - [Owl architecture: the rendering pipeline](doc/miscellaneous/rendering.md)
 - [Comparison with React/Vue](doc/miscellaneous/comparison.md)
 - [Why did Odoo built Owl?](doc/miscellaneous/why_owl.md)
 ## Installing Owl
 Owl is available on `npm` and can be installed with the following command:
 ```
 npm install @odoo/owl
 ```
 If you want to use a simple `<script>` tag, the last release can be downloaded here:
- [owl-1.4.7](https://github.com/odoo/owl/releases/tag/v1.4.7)
+- [owl-1.0.0-alpha5.js](https://github.com/odoo/owl/releases/download/v1.0.0-alpha5/owl.js)
 - [owl-1.0.0-alpha5.min.js](https://github.com/odoo/owl/releases/download/v1.0.0-alpha5/owl.min.js)
 Some npm scripts are available:
 | Command          | Description                                        |
 | ---------------- | -------------------------------------------------- |
 | `npm install`    | install every dependency required for this project |
 | `npm run build`  | build a bundle of _owl_ in the _/dist/_ folder     |
 | `npm run minify` | minify the prebuilt owl.js file                    |
 | `npm run test`   | run all (owl) tests                                |
 ## Quick Overview
 Owl components in an application are used to define a (dynamic) tree of components.
 ```
        Root
        /   \
       A     B
      / \
     C   D
 ```
 **State:** each component can manage its own local state. It is a simple ES6
 class, there are no special rules:
 ```js
 class Counter extends Component {
  static template = xml`
    <button t-on-click="increment">
      Click Me! [<t t-esc="state.value"/>]
    </button>`;
  state = { value: 0 };
  increment() {
    this.state.value++;
    this.render();
  }
 }
 ```
 The example above shows a component with a local state. Note that since there
 is nothing magical to the `state` object, we need to manually call the `render`
 function whenever we update it. This can quickly become annoying (and not
 efficient if we do it too much). There is a better way: using the `useState`
 hook, which transforms an object into a reactive version of itself:
 ```js
 const { useState } = owl.hooks;
 class Counter extends Component {
  static template = xml`
    <button t-on-click="increment">
      Click Me! [<t t-esc="state.value"/>]
    </button>`;
  state = useState({ value: 0 });
  increment() {
    this.state.value++;
  }
 }
 ```
 Note that the `t-on-click` handler can even be replaced by an inline statement:
 ```xml
    <button t-on-click="state.value++">
 ```
 **Props:** sub components often needs some information from their parents. This
 is done by adding the required information to the template. This will then be
 accessible by the sub component in the `props` object. Note that there is an
 important rule here: the information contained in the `props` object is not
 owned by the sub component, and should never be modified.
 ```js
 class Child extends Component {
  static template = xml`<div>Hello <t t-esc="props.name"/></div>`;
 }
 class Parent extends Component {
  static template = xml`
    <div>
        <Child name="'Owl'" />
        <Child name="'Framework'" />
    </div>`;
  static components = { Child };
 }
 ```
 **Communication:** there are multiple ways to communicate information between
 components. However, the two most important ways are the following:
 - from parent to children: by using `props`,
 - from a children to one of its parent: by triggering events.
 The following example illustrate both mechanisms:
 ```js
 class OrderLine extends Component {
  static template = xml`
    <div t-on-click="add">
        <div><t t-esc="props.line.name"/></div>
        <div>Quantity: <t t-esc="props.line.quantity"/></div>
    </div>`;
  add() {
    this.trigger("add-to-order", { line: props.line });
  }
 }
 class Parent extends Component {
  static template = xml`
    <div t-on-add-to-order="addToOrder">
        <OrderLine
            t-foreach="orders"
            t-as="line"
            line="line" />
    </div>`;
  static components = { OrderLine };
  orders = useState([{ id: 1, name: "Coffee", quantity: 0 }, { id: 2, name: "Tea", quantity: 0 }]);
  addToOrder(event) {
    const line = event.detail.line;
    line.quantity++;
  }
 }
 ```
 In this example, the `OrderLine` component trigger a `add-to-order` event. This
 will generate a DOM event which will bubble along the DOM tree. It will then be
 intercepted by the parent component, which will then get the line (from the
 `detail` key) and then increment its quantity. See the section on [event handling](doc/reference/component.md#event-handling)
 for more details on how events work.
 Note that this example would have also worked if the `OrderLine` component
 directly modifies the `line` object. However, this is not a good practice: this
 only works because the `props` object received by the child component is reactive,
 so the child component is then coupled to the parents implementation.
 ## License
 OWL is [LGPL licensed](./LICENSE).
@@ -4,7 +4,7 @@ OWL, React and Vue have the same main feature: they allow developers to build
 declarative user interfaces. To do that, all these frameworks uses a virtual dom. However, there are still obviously many differences.
 In this page, we try to highlight some of these differences. Obviously, a lot of
-effort was put to be fair. However, if you disagree with some of the points
+effort was done to be fair. However, if you disagree with some of the points
 discussed, feel free to open an issue/submit a PR to correct this text.
 ## Content
@@ -14,7 +14,8 @@ discussed, feel free to open an issue/submit a PR to correct this text.
 - [Tooling/Build Step](#toolingbuild-step)
 - [Templating](#templating)
 - [Asynchronous rendering](#asynchronous-rendering)
- [Reactivity](#reactivity)
+- [Reactiveness](#reactiveness)
 - [State Management](#state-management)
 - [Hooks](#hooks)
 ## Size
@@ -46,7 +47,7 @@ components are fast enough for all our usecases, and making it as simple as
 possible for developers is more valuable (for us).
 Also, functions or class based components are more than just syntax. Functions
-come with a mindset of composition and class are about inheritance. Clearly,
+comes with a mindset of composition and class are about inheritance. Clearly,
 both of these are important mechanisms for reusing code. Also, one does not
 exclude the other.
@@ -78,7 +79,7 @@ additional tools, we made a lot of effort to make the most of the web platform.
 For example, Owl uses the standard `xml` parser that comes with every browser.
 Because of that, Owl did not have to write its own template parser. Another
-example is the [`xml`](../reference/tags.md#xml-tag) tag helper function, which makes use of
+example is the [`xml`](reference/tags.md#xml-tag) tag helper function, which makes use of
 native template literals to allow in a natural way to write `xml` templates
 directly in the javascript code. This can be easily integrated with editor
 plugins to have autocompletion inside the template.
@@ -126,7 +127,7 @@ structured than a template language. Note that the tooling is quite impressive:
 there is a syntax highlighter for jsx here on github!
 By comparison, here is the equivalent Owl component, written with the
-[`xml`](../reference/tags.md#xml-tag) tag helper:
+[`xml`](reference/tags.md#xml-tag) tag helper:
 ```js
 class Clock extends Component {
@@ -172,7 +173,7 @@ more convoluted. For example, in Vue, you need to use a dynamic import keyword
 that needs to be transpiled at build time in order for the component to be loaded
 asynchronously (see [the documentation](https://vuejs.org/v2/guide/components-dynamic-async.html#Async-Components)).
-## Reactivity
+## Reactiveness
 React has a simple model: whenever the state changes, it is
 replaced with a new state (via the `setState` method). Then, the DOM is patched.
@@ -188,6 +189,95 @@ with a `Proxy`, which means that it is totally transparent to the developers.
 Adding new keys is supported. Once any part of the state has been changed, a
 rendering is scheduled in the next microtask tick (promise queue).
 ## State Management
 Managing the state of an application is a tricky issue. Many solutions have
 been proposed these last few years. It also depends on the kind of application we
 are talking about. A small application may not need much more than a simple
 object to contain its state.
 However, there are some common solutions for React and Vue: redux and vuex.
 Both of them are a centralized store that own the state, and they dictate how
 the state can be mutated.
 **Redux**
 In Redux, the state is mutated by reducers. Reducers are functions
 that modify the state by returning a different object:
 ```javascript
  ...
  switch (action.type) {
    case ADD_TODO: {
      const { id, content } = action.payload;
      return {
        ...state,
        allIds: [...state.allIds, id],
        byIds: {
          ...state.byIds,
          [id]: {
            content,
            completed: false
          }
        }
      };
    }
 ```
 This is a little bit awkward to write, but this allows the component system to
 check if a part of the state was changed. This is exactly what is done by the
 `connect` function: it create a _connected_ component, which is subscribed to
 the state and triggers a rerender if some part of the state was modified.
 **VueX**
 VueX is based on a different principle: the state is mutated through
 some special functions (the mutations), which modify the state in place:
 ```javascript
    function ({state}, payload) {
        const { id, content } = payload;
        const message = {id, content, completed: false};
        state.messages.push(message)
    }
 ```
 This is simpler, but there is a little bit more happening behind the scene:
 each key from the state is silently replaced by getters and setters, and VueX
 keeps track of who get data, and retrigger a render when it was changed.
 **Owl**
 Owl store is a little bit like a mix of redux and vuex: it has actions (but not
 mutations), and like VueX, it keeps track of the state changes. However, it does
 not notify a component when the state changes. Instead, components need to connect
 to the store like in redux, with the `useStore` hook (see the [store documentation](reference/store.md#connecting-a-component)).
 ```javascript
 const actions = {
  increment({ state }, val) {
    state.counter.value += val;
  }
 };
 const state = {
  counter: { value: 0 }
 };
 const store = new owl.Store({ state, actions });
 class Counter extends Component {
  static template = xml`
      <button t-name="Counter" t-on-click="dispatch('increment')">
        Click Me! [<t t-esc="counter.value"/>]
      </button>`;
  counter = useStore(state => state.counter);
  dispatch = useDispatch();
 }
 Counter.env.store = store;
 const counter = new Counter();
 ```
 ## Hooks
 [Hooks](https://reactjs.org/docs/hooks-intro.html#motivation) recently took over
@@ -225,7 +315,7 @@ This work is based on the new ideas introduced by React hooks.
 From the way React and Vue introduce their hooks, it may look like hooks are not
 compatible with class components. However, this is not the case, as shown by
-Owl [hooks](../reference/hooks.md). They are inspired by both React and Vue. For example,
+Owl [hooks](reference/hooks.md). They are inspired by both React and Vue. For example,
 the `useState` hook is named after React, but its API is closer to the `reactive`
 Vue hook.
@@ -252,4 +342,4 @@ class Example extends Component {
 Since the Owl framework had hooks from early in its life, its main APIs
 are designed to be interacted with hooks from the start. For example, the
-`Context` abstraction.
+`Context` and `Store` abstractions.
@@ -1,52 +0,0 @@
 # 🦉 How to write Single File Components 🦉
 It is very useful to group code by feature instead of by type of file. It makes
 it easier to scale application to larger size.
 To do so, Owl has two small helpers that make it easy to define a
 template or a stylesheet inside a javascript (or typescript) file: the
 [`xml`](../reference/tags.md#xml-tag) and [`css`](../reference/tags.md#css-tag)
 helper.
 This means that the template, the style and the javascript code can be defined in
 the same file. For example:
 ```js
 const { Component } = owl;
 const { xml, css } = owl.tags;
 // -----------------------------------------------------------------------------
 // TEMPLATE
 // -----------------------------------------------------------------------------
 const TEMPLATE = xml/* xml */ `
 	<div class="main">
 		<Sidebar/>
 		<Content />
 	</div>`;
 // -----------------------------------------------------------------------------
 // STYLE
 // -----------------------------------------------------------------------------
 const STYLE = css/* css */ `
  .main {
    display: grid;
    grid-template-columns: 200px auto;
  }
 `;
 // -----------------------------------------------------------------------------
 // CODE
 // -----------------------------------------------------------------------------
 class Main extends Component {
  static template = TEMPLATE;
  static style = STYLE;
  static components = { Sidebar, Content };
  // rest of component...
 }
 ```
 Note that the above example has an inline xml comment, just after the `xml` call.
 This is useful for some editor plugins, such as the VS Code addon
 `Comment tagged template`, which, if installed, add syntax highlighting to the
 content of the template string.
@@ -1,399 +1,107 @@
-# 🦉 How to start an Owl project 🦉
+# 🦉 Quick Start 🦉
-## Content
+## Static Server
- [Overview](#overview)
+Let us assume that we have a static server running somewhere. Let us start by
- [Simple html file](#simple-html-file)
+adding an html page with a few extra files:
 - [With a static server](#with-a-static-server)
 - [Standard Javascript project](#standard-javascript-project)
 ## Overview
 Each software project has its specific needs. Many of these needs can be solved
 with some tooling: `webpack`, `gulp`, css preprocessor, bundlers, transpilers, ...
 Because of that, it is usually not simple to just start a project. Some
 frameworks provide their own tooling to help with that. But then, you have to
 integrate and learn how these applications work.
 Owl is designed to be used with no tooling at all. Because of that, Owl can
 "easily" be integrated in a modern build toolchain. In this section, we will
 discuss a few different setups to start a project. Each of these setups has
 advantages and disadvantages in different situations.
 ## Simple html file
 The simplest possible setup is the following: a simple javascript file with your
 code. To do that, let us create the following file structure:
 ```
-hello_owl/
+my-app/
-  index.html
+    index.html
-  owl.js
+    app.css
-  app.js
+    app.js
    owl-X.Y.Z.js
    templates.xml
 ```
-The file `owl.js` can be downloaded from the last release published at
+### HTML and CSS
 [https://github.com/odoo/owl/releases](https://github.com/odoo/owl/releases). It
 is a single javascript file which export all Owl into the global `owl` object.
 Note that there are multiple files, and in this case, we need one of the two
 files suffixed with `.iife`: they are built to be directly used in a browser.
-Now, `index.html` should contain the following:
+In a file `index.html`:
 ```html
 <!DOCTYPE html>
 <html lang="en">
  <head>
-    <title>Hello Owl</title>
+    <meta charset="UTF-8" />
-    <script src="owl.js"></script>
+    <title>My OWL App</title>
    <link href="app.css" rel="stylesheet" />
    <script src="owl-X.Y.Z.js"></script>
  </head>
  <body>
-    <script src="app.js"></script>
+    <div id="main"></div>
    <script src="app.js" type="module"></script>
  </body>
 </html>
 ```
-And `app.js` should look like this:
+In `app.css`:
-```js
+```css
-const { Component, mount, xml } = owl;
+button {
-
+  color: darkred;
-// Owl Components
+  font-size: 30px;
-class Root extends Component {
+  width: 220px;
  static template = xml`<div>Hello Owl</div>`;
 }
 mount(Root, document.body);
 ```
 Now, simply loading this html file in a browser should display a welcome message.
 This setup is not fancy, but it is extremely simple. There are no tooling at
 all required. It can be slightly optimized by using the minified build of Owl.
 ## With a static server
 The previous setup has a big disadvantage: the application code is located in a
 single file. Obviously, we could split it in several files and add multiple
 `<script>` tags in the html page, but then we need to make sure the script are
 inserted in the proper order, we need to export each file content in global
 variables and we lose autocompletion across files.
 There is a low tech solution to this issue: using native javascript modules.
 This however has a requirement: for security reasons, browsers will not accept
 modules on content served through the `file` protocol. This means that we need
 to use a static server.
 Let us start a new project with the following file structure:
 ```
 hello_owl/
  src/
    index.html
    main.js
    owl.js
    root.js
 ```
 As previously, the file `owl.js` can be downloaded from the last release published at
 [https://github.com/odoo/owl/releases](https://github.com/odoo/owl/releases).
 Note that there are multiple files, and in this case, we need one of the two
 files suffixed with `.iife`: they are built to be directly used in a browser.
 Now, `index.html` should contain the following:
 ```html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <title>Hello Owl</title>
    <script src="owl.js"></script>
  </head>
  <body>
    <script src="main.js" type="module"></script>
  </body>
 </html>
 ```
 Not that the `main.js` script tag has the `type="module"` attribute. This means
 that the browser will parse the script as a module, and load all its dependencies.
 Here is the content of `root.js` and `main.js`:
 ```js
 // root.js ----------------------------------------------------------------------
 const { Component, mount, xml } = owl;
 export class Root extends Component {
  static template = xml`<div>Hello Owl</div>`;
 }
 // main.js ---------------------------------------------------------------------
 import { Root } from "./root.js";
 mount(Root, document.body);
 ```
 The `main.js` file imports the `root.js` file. Note that the import statement has
 a `.js` suffix, which is important. Most text editor can understand this syntax
 and will provide autocompletion.
 Now, to execute this code, we need to serve the `src` folder statically. A low
 tech way to do that is to use for example the python `SimpleHTTPServer` feature:
 ```
 $ cd src
 $ python -m SimpleHTTPServer 8022    # now content is available at localhost:8022
 ```
 Another more "javascripty" way to do it is to create a `npm` application. To do
 that, we can add the following `package.json` file at the root of the project:
 ```json
 {
  "name": "hello_owl",
  "version": "0.1.0",
  "description": "Starting Owl app",
  "main": "src/index.html",
  "scripts": {
    "serve": "serve src"
  },
  "author": "John",
  "license": "ISC",
  "devDependencies": {
    "serve": "^11.3.0"
  }
 }
 ```
-We can now install the `serve` tool with the command `npm install`, and then,
+Also, let's not forget to add a release of OWL (`owl-X.Y.Z.js`)
 start a static server with the simple `npm run serve` command.
-## Standard Javascript project
+### XML
-The previous setup works, and is certainly good for some usecases, including
+In `templates.xml`:
 quick prototyping. However, it lacks some useful features, such as livereload,
 a test suite, or bundling the code in a single file.
-Each of these features, and many others, can be done in many different ways.
+```xml
-Since it is really not trivial to configure such a project, we provide here an
+<templates>
-example that can be used as a starting point.
+   <button t-name="clickcounter" t-on-click="increment">
-
+      Click Me! [<t t-esc="state.value"/>]
-Our standard Owl project has the following file structure:
+    </button>
-
+</templates>
 ```
 hello_owl/
  public/
    index.html
  src/
    components/
      Root.js
    main.js
  tests/
    components/
      Root.test.js
    helpers.js
  .gitignore
  package.json
  webpack.config.js
 ```
-This project as a `public` folder, meant to contain all static assets, such as
+### JS
 images and styles. The `src` folder has the javascript source code, and finally,
 `tests` contains the test suite.
-Here is the content of `index.html`:
+To build an application (or a sub-part of an application), we need two things:
-```html
+- an environment: it is the global context in which we are working. It needs to
-<!DOCTYPE html>
+  contain a QWeb instance (preloaded with templates), and anything else that we
-<html lang="en">
+  need. In practice, it could be used to contain some user session information, some
-  <head>
+  configuration keys (for example, isMobile = true/false if we are in mobile mode).
    <title>Hello Owl</title>
  </head>
  <body></body>
 </html>
 ```
-Note that there are no `<script>` tag here. They will be injected by webpack.
+- a description of the user interface: there should be a root component, which can
-Now, let's have a look at the javascript files:
+  have sub components
-```js
+Here are a few steps that we may take to get started:
 // src/components/Root.js -------------------------------------------------------
 import { Component, xml, useState } from "@odoo/owl";
-export class Root extends Component {
+- get the templates
-  static template = xml`
+- create a qweb engine, with the templates
-    <div t-on-click="update">
+- create an environment
-      Hello <t t-esc="state.text"/>
+- create an instance of the root component
-    </div>`;
+- mount the root component to a DOM element
-  state = useState({ text: "Owl" });
+Let us now add the javascript to make it work, in `app.js`:
-  update() {
+
-    this.state.text = this.state.text === "Owl" ? "World" : "Owl";
+```javascript
 const useState = owl.hooks.useState;
 class ClickCounter extends owl.Component {
  static template = "clickcounter";
  state = useState({ value: 0 });
  increment() {
    this.state.value++;
  }
 }
-// src/main.js -----------------------------------------------------------------
+//------------------------------------------------------------------------------
-import { utils, mount } from "@odoo/owl";
+// Application initialization
-import { Root } from "./components/Root";
+//------------------------------------------------------------------------------
-
+async function start() {
-mount(Root, document.body);
+  const templates = await owl.utils.loadFile("templates.xml");
-
+  ClickCounter.env = { qweb: new owl.QWeb({ templates }) };
-// tests/components/Root.test.js ------------------------------------------------
+  const counter = new ClickCounter();
-import { Root } from "../../src/components/Root";
+  const target = document.getElementById("main");
-import { makeTestFixture, nextTick, click } from "../helpers";
+  await counter.mount(target);
 import { mount } from "@odoo/owl";
 let fixture;
 beforeEach(() => {
  fixture = makeTestFixture();
 });
 afterEach(() => {
  fixture.remove();
 });
 describe("Root", () => {
  test("Works as expected...", async () => {
    await mount(Root, fixture);
    expect(fixture.innerHTML).toBe("<div>Hello Owl</div>");
    click(fixture, "div");
    await nextTick();
    expect(fixture.innerHTML).toBe("<div>Hello World</div>");
  });
 });
 // tests/helpers.js ------------------------------------------------------------
 import { Component } from "@odoo/owl";
 import "regenerator-runtime/runtime";
 export async function nextTick() {
  await new Promise((resolve) => setTimeout(resolve));
  await new Promise((resolve) => requestAnimationFrame(resolve));
 }
-export function makeTestFixture() {
+start();
  let fixture = document.createElement("div");
  document.body.appendChild(fixture);
  return fixture;
 }
 export function click(elem, selector) {
  elem.querySelector(selector).dispatchEvent(new Event("click"));
 }
 ```
 Finally, here is the configuration files `.gitignore`, `package.json` and
 `webpack.config.js`:
 ```
 node_modules/
 package-lock.json
 dist/
 ```
 ```json
 {
  "name": "hello_owl",
  "version": "0.1.0",
  "description": "Demo app",
  "main": "src/index.html",
  "scripts": {
    "test": "jest",
    "build": "webpack --mode production",
    "dev": "webpack-dev-server --mode development"
  },
  "author": "Someone",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.8.4",
    "@babel/plugin-proposal-class-properties": "^7.8.3",
    "babel-jest": "^25.1.0",
    "babel-loader": "^8.0.6",
    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
    "html-webpack-plugin": "^3.2.0",
    "jest": "^25.1.0",
    "regenerator-runtime": "^0.13.3",
    "serve": "^11.3.0",
    "webpack": "^4.41.5",
    "webpack-cli": "^3.3.10",
    "webpack-dev-server": "^3.10.2"
  },
  "dependencies": {
    "@odoo/owl": "^1.0.4"
  },
  "babel": {
    "plugins": ["@babel/plugin-proposal-class-properties"],
    "env": {
      "test": {
        "plugins": ["transform-es2015-modules-commonjs"]
      }
    }
  },
  "jest": {
    "verbose": false,
    "testRegex": "(/tests/.*(test|spec))\\.js?$",
    "moduleFileExtensions": ["js"],
    "transform": {
      "^.+\\.[t|j]sx?$": "babel-jest"
    }
  }
 }
 ```
 ```js
 const path = require("path");
 const HtmlWebpackPlugin = require("html-webpack-plugin");
 const host = process.env.HOST || "localhost";
 module.exports = function (env, argv) {
  const mode = argv.mode || "development";
  return {
    mode: mode,
    entry: "./src/main.js",
    output: {
      filename: "main.js",
      path: path.resolve(__dirname, "dist"),
    },
    module: {
      rules: [
        {
          test: /\.jsx?$/,
          loader: "babel-loader",
          exclude: /node_modules/,
        },
      ],
    },
    resolve: {
      extensions: [".js", ".jsx"],
    },
    devServer: {
      contentBase: path.resolve(__dirname, "public/index.html"),
      compress: true,
      hot: true,
      host,
      port: 3000,
      publicPath: "/",
    },
    plugins: [
      new HtmlWebpackPlugin({
        inject: true,
        template: path.resolve(__dirname, "public/index.html"),
      }),
    ],
  };
 };
 ```
 With this setup, we can now use the following script commands:
 ```
 npm run build # build the full application in prod mode in dist/
 npm run dev # start a dev server with livereload
 npm run test # run the jest test suite
 ```
@@ -1,4 +1,4 @@
-# 🦉 How to test Components 🦉
+# 🦉 Testing Owl components 🦉
 ## Content
@@ -11,7 +11,8 @@ It is a good practice to test applications and components to ensure that they
 behave as expected. There are many ways to test a user interface: manual
 testing, integration testing, unit testing, ...
-In this section, we will discuss how to write unit tests for components.
+In this section, we will discuss how to write unit tests for components, and
 how to debug them if necessary.
 ## Unit Tests
@@ -30,21 +31,27 @@ To help with this, it is useful to have a `helper.js` file that contains some
 common utility functions:
 ```js
 let lastFixture = null;
 export function makeTestFixture() {
  let fixture = document.createElement("div");
  document.body.appendChild(fixture);
  if (lastFixture) {
    lastFixture.remove();
  }
  lastFixture = fixture;
  return fixture;
 }
-export async function nextTick() {
+export function nextTick() {
-  await new Promise((resolve) => setTimeout(resolve));
+  let requestAnimationFrame = owl.Component.scheduler.requestAnimationFrame;
-  await new Promise((resolve) => requestAnimationFrame(resolve));
+  return new Promise(function(resolve) {
    setTimeout(() => requestAnimationFrame(() => resolve()));
  });
 }
 export function makeTestEnv() {
    // application specific. It needs a way to load actual templates
    const templates = ...;
    return {
        qweb: new QWeb(templates),
        ..., // each service can be mocked here
    };
 }
 ```
@@ -53,7 +60,7 @@ With such a file, a typical test suite for Jest will look like this:
 ```js
 // in SomeComponent.test.js
 import { SomeComponent } from "../../src/ui/SomeComponent";
-import { nextTick, makeTestFixture } from '../helpers';
+import { nextTick, makeTestFixture, makeTestEnv} from '../helpers';
 //------------------------------------------------------------------------------
@@ -64,6 +71,9 @@ let env: Env;
 beforeEach(() => {
  fixture = makeTestFixture();
  env = makeTestEnv();
  // we set here the default environment for each component created in the test
  Component.env = env;
 });
 afterEach(() => {
@@ -76,7 +86,8 @@ afterEach(() => {
 describe("SomeComponent", () => {
  test("component behaves as expected", async () => {
    const props = {...}; // depends on the component
-    const comp = await mount(SomeComponent, fixture, { props });
+    const comp = new SomeComponent(null, props);
    await comp.mount(fixture);
    // do some assertions
    expect(...).toBe(...);
@@ -93,3 +104,29 @@ describe("SomeComponent", () => {
 Note that Owl does wait for the next animation frame to actually update the DOM.
 This is why it is necessary to wait with the `nextTick` (or other methods) to
 make sure that the DOM is up-to-date.
 It is sometimes useful to wait until Owl is completely done updating components
 (in particular, if we have a highly concurrent user interface). This next
 helper simply polls every 20ms the internal Owl task queue and returns a promise
 which resolves when it is empty:
 ```js
 function afterUpdates() {
  return new Promise((resolve, reject) => {
    let timer = setTimeout(poll, 20);
    let counter = 0;
    function poll() {
      counter++;
      if (owl.Component.scheduler.tasks.length) {
        if (counter > 10) {
          reject(new Error("timeout"));
        } else {
          timer = setTimeout(poll);
        }
      } else {
        resolve();
      }
    }
  });
 }
 ```
@@ -37,7 +37,7 @@ todoapp/
    index.html
    app.css
    app.js
-    owl.js
+    owl.min.js
 ```
 The entry point for this application is the file `index.html`, which should have
@@ -50,11 +50,10 @@ the following content:
    <meta charset="UTF-8" />
    <title>OWL Todo App</title>
    <link rel="stylesheet" href="app.css" />
  </head>
  <body>
    <script src="owl.js"></script>
    <script src="app.js"></script>
-  </body>
+  </head>
  <body></body>
 </html>
 ```
@@ -63,7 +62,7 @@ our application. `app.js` is where we will write all our code. For now, let's
 just put the following code:
 ```js
-(function () {
+(function() {
  console.log("hello owl", owl.__info__.version);
 })();
 ```
@@ -71,35 +70,44 @@ just put the following code:
 Note that we put everything inside an immediately executed function to avoid leaking
 anything to the global scope.
-Finally, `owl.js` should be the last version downloaded from the Owl repository (you can use `owl.min.js` if you prefer). Be aware that you should download the `owl.iife.js` or `owl.iife.min.js`, because these files
+Finally, `owl.js` should be the last version downloaded from the Owl repository (you can use `owl.min.js` if you prefer).
 are built to run directly on the browser, and rename it `owl.js` (other files such as `owl.cjs.js` are
 built to be bundled by other tools).
 Now, the project should be ready. Loading the `index.html` file into a browser
 should show an empty page, with the title `Owl Todo App`, and it should log a
-message such as `hello owl 2.x.y` in the console.
+message such as `hello owl 1.0.0` in the console.
 ## 2. Adding a first component
 An Owl application is made out of [components](../reference/component.md), with
-a single root component. Let us start by defining a `Root` component. Replace the
+a single root component. Let us start by defining an `App` component. Replace the
 content of the function in `app.js` by the following code:
 ```js
-const { Component, mount, xml } = owl;
+const { Component } = owl;
 const { xml } = owl.tags;
 const { whenReady } = owl.utils;
 // Owl Components
-class Root extends Component {
+class App extends Component {
  static template = xml`<div>todo app</div>`;
 }
-mount(Root, document.body);
+// Setup code
 function setup() {
  const app = new App();
  app.mount(document.body);
 }
 whenReady(setup);
 ```
 Now, reloading the page in a browser should display a message.
-The code is pretty simple: we define a component with an inline template, then
+The code is pretty simple, but let us explain the last line in more detail. The
-mount it in the document body.
+browser tries to execute the javascript code in `app.js` as quickly as possible,
 and it could happen that the DOM is not ready yet when we try to mount the `App`
 component. To avoid this situation, we use the [`whenReady`](../reference/utils.md#whenready)
 helper to delay the execution of the `setup` function until the DOM is ready.
 Note 1: in a larger project, we would split the code in multiple files, with
 components in a sub folder, and a main file that would initialize the application.
@@ -140,20 +148,20 @@ with the following keys:
  tasks. Since the title is something created/edited by the user, it offers
  no guarantee that it is unique. So, we will generate a unique `id` number for
  each task.
- `text`: a string, to explain what the task is about.
+- `title`: a string, to explain what the task is about.
 - `isCompleted`: a boolean, to keep track of the status of the task
 Now that we decided on the internal format of the state, let us add some demo
 data and a template to the `App` component:
 ```js
-class Root extends Component {
+class App extends Component {
  static template = xml/* xml */ `
    <div class="task-list">
        <t t-foreach="tasks" t-as="task" t-key="task.id">
            <div class="task">
                <input type="checkbox" t-att-checked="task.isCompleted"/>
-                <span><t t-esc="task.text"/></span>
+                <span><t t-esc="task.title"/></span>
            </div>
        </t>
    </div>`;
@@ -161,14 +169,14 @@ class Root extends Component {
  tasks = [
    {
      id: 1,
-      text: "buy milk",
+      title: "buy milk",
-      isCompleted: true,
+      isCompleted: true
    },
    {
      id: 2,
-      text: "clean house",
+      title: "clean house",
-      isCompleted: false,
+      isCompleted: false
-    },
+    }
  ];
 }
 ```
@@ -236,25 +244,29 @@ a little bit:
 // -------------------------------------------------------------------------
 // Task Component
 // -------------------------------------------------------------------------
-class Task extends Component {
+const TASK_TEMPLATE = xml /* xml */`
  static template = xml /* xml */`
    <div class="task" t-att-class="props.task.isCompleted ? 'done' : ''">
-      <input type="checkbox" t-att-checked="props.task.isCompleted"/>
+        <input type="checkbox" t-att-checked="props.task.isCompleted"/>
-      <span><t t-esc="props.task.title"/></span>
+        <span><t t-esc="props.task.title"/></span>
    </div>`;
-  static props = ["task"];
+
 class Task extends Component {
    static template = TASK_TEMPLATE;
    static props = ["task"];
 }
 // -------------------------------------------------------------------------
-// Root Component
+// App Component
 // -------------------------------------------------------------------------
-class Root extends Component {
+const APP_TEMPLATE = xml /* xml */`
  static template = xml /* xml */`
    <div class="task-list">
-      <t t-foreach="tasks" t-as="task" t-key="task.id">
+        <t t-foreach="tasks" t-as="task" t-key="task.id">
-        <Task task="task"/>
+            <Task task="task"/>
-      </t>
+        </t>
    </div>`;
 class App extends Component {
    static template = APP_TEMPLATE;
    static components = { Task };
    tasks = [
@@ -263,9 +275,15 @@ class Root extends Component {
 }
 // -------------------------------------------------------------------------
-// Setup
+// Setup code
 // -------------------------------------------------------------------------
-mount(Root, document.body, {dev: true});
+function setup() {
    owl.config.mode = "dev";
    const app = new App();
    app.mount(document.body);
 }
 whenReady(setup);
 ```
 A lot of stuff happened here:
@@ -274,22 +292,24 @@ A lot of stuff happened here:
 - whenever we define a sub component, it needs to be added to the static
  [`components`](../reference/component.md#static-properties)
  key of its parent, so Owl can get a reference to it,
 - the templates have been extracted out of the components, to make it easier to
  differentiate the "view/template" code from the "script/behavior" code,
 - the `Task` component has a `props` key: this is only useful for validation
  purpose. It says that each `Task` should be given exactly one prop, named
  `task`. If this is not the case, Owl will throw an
  [error](../reference/props_validation.md). This is extremely
  useful when refactoring components
 - finally, to activate the props validation, we need to set Owl's
-  [mode](../reference/config.md#mode) to `dev`. This is done in the last argument
+  [mode](../reference/config.md#mode) to `dev`. This is done in the `setup`
-  of the `mount` function. Note that this should be removed when an app is used in a real
+  function. Note that this should be removed when an app is used in a real
  production environment, since `dev` mode is slightly slower, due to extra
  checks and validations.
 ## 6. Adding tasks (part 1)
 We still use a list of hardcoded tasks. It's really time to give the user a way
-to add tasks himself. The first step is to add an input to the `Root` component.
+to add tasks himself. The first step is to add an input to the `App` component.
-But this input will be outside of the task list, so we need to adapt `Root`
+But this input will be outside of the task list, so we need to adapt `App`
 template, js, and css:
 ```xml
@@ -307,9 +327,9 @@ template, js, and css:
 addTask(ev) {
    // 13 is keycode for ENTER
    if (ev.keyCode === 13) {
-        const text = ev.target.value.trim();
+        const title = ev.target.value.trim();
        ev.target.value = "";
-        console.log('adding task', text);
+        console.log('adding task', title);
        // todo
    }
 }
@@ -338,9 +358,10 @@ task. Notice that when you load the page, the input is not focused. But adding
 tasks is a core feature of a task list, so let us make it as fast as possible by
 focusing the input.
-We need to execute code when the `Root` component is ready (mounted). Let's do
+Since `App` is a component, it has a
-that using the `onMounted` hook. We will also need to get a reference to the
+[`mounted` lifecycle method](../reference/component.md#lifecycle) that we can
-input, by using the `t-ref` directive with the [`useRef`](../reference/hooks.md#useref) hook:
+implement. We will also need to get a reference to the input, by using the
 `t-ref` directive with the [`useRef`](../reference/hooks.md#useref) hook:
 ```xml
 <input placeholder="Enter a new task" t-on-keyup="addTask" t-ref="add-input"/>
@@ -348,21 +369,22 @@ input, by using the `t-ref` directive with the [`useRef`](../reference/hooks.md#
 ```js
 // on top of file:
-const { Component, mount, xml, useRef, onMounted } = owl;
+const { useRef } = owl.hooks;
 ```
 ```js
 // in App
-setup() {
+inputRef = useRef("add-input");
-    const inputRef = useRef("add-input");
+
-    onMounted(() => inputRef.el.focus());
+mounted() {
    this.inputRef.el.focus();
 }
 ```
-This is a very common situation: whenever we need to perform some actions depending
+The `inputRef` is defined as a class field, so it is equivalent to defining it
-on the lifecycle of a component, we need to do it in the `setup` method, by using
+in the constructor. It simply instructs Owl to keep a reference to anything with
-one of the lifecycle hook. Here, we first get a reference to the `inputRef`,
+the corresponding `t-ref` keyword. We then implement the `mounted` lifecycle
-then in the `onMounted` hook, we simply focus the html element.
+method, where we now have an active reference that we can use to focus the input.
 ## 7. Adding tasks (part 2)
@@ -383,12 +405,12 @@ Now, the `addTask` method can be implemented:
 addTask(ev) {
    // 13 is keycode for ENTER
    if (ev.keyCode === 13) {
-        const text = ev.target.value.trim();
+        const title = ev.target.value.trim();
        ev.target.value = "";
-        if (text) {
+        if (title) {
            const newTask = {
                id: this.nextId++,
-                text: text,
+                title: title,
                isCompleted: false,
            };
            this.tasks.push(newTask);
@@ -406,7 +428,7 @@ the user interface. We can fix the issue by making `tasks` reactive, with the
 ```js
 // on top of the file
-const { Component, mount, xml, useRef, onMounted, useState } = owl;
+const { useRef, useState } = owl.hooks;
 // replace the task definition in App with the following:
 tasks = useState([]);
@@ -421,8 +443,12 @@ did not change in opacity. This is because there is no code to modify the
 `isCompleted` flag.
 Now, this is an interesting situation: the task is displayed by the `Task`
-component, but it is not the owner of its state, so ideally, it should not modify it.
+component, but it is not the owner of its state, so it cannot modify it. Instead,
-However, for now, that's what we will do (this will be improved in a later step).
+we want to communicate the request to toggle a task to the `App` component.
 Since `App` is a parent of `Task`, we can
 [trigger](../reference/component.md#event-handling) an event in `Task` and listen
 for it in `App`.
 In `Task`, change the `input` to:
 ```xml
@@ -433,23 +459,36 @@ and add the `toggleTask` method:
 ```js
 toggleTask() {
-  this.props.task.isCompleted = !this.props.task.isCompleted;
+    this.trigger('toggle-task', {id: this.props.task.id});
 }
 ```
 We now need to listen for that event in the `App` template:
 ```xml
 <div class="task-list" t-on-toggle-task="toggleTask">
 ```
 and implement the `toggleTask` code:
 ```js
 toggleTask(ev) {
    const task = this.tasks.find(t => t.id === ev.detail.id);
    task.isCompleted = !task.isCompleted;
 }
 ```
 ## 9. Deleting tasks
-Let us now add the possibility do delete tasks. This is different from the previous
+Let us now add the possibility do delete tasks. To do that, we first need to add
-feature: deleting task has to be done on the task itself, but the actual operation
+a trash icon on each task, then we will proceed just like in the previous section.
 need to be done on the task list. So, we need to communicate the request to the
 `Root` component. This is usually done by providing a callback in a prop.
 First, let us update the `Task` template, css and js:
 ```xml
 <div class="task" t-att-class="props.task.isCompleted ? 'done' : ''">
    <input type="checkbox" t-att-checked="props.task.isCompleted" t-on-click="toggleTask"/>
-    <span><t t-esc="props.task.text"/></span>
+    <span><t t-esc="props.task.title"/></span>
    <span class="delete" t-on-click="deleteTask">🗑</span>
 </div>
 ```
@@ -478,226 +517,220 @@ First, let us update the `Task` template, css and js:
 ```
 ```js
 static props = ["task", "onDelete"];
 deleteTask() {
-    this.props.onDelete(this.props.task);
+    this.trigger('delete-task', {id: this.props.task.id});
 }
 ```
-And now, we need to provide the `onDelete` callback to each tasks in the `Root`
+And now, we need to listen to the `delete-task` event in `App`:
 component:
 ```xml
-  <Task task="task" onDelete.bind="deleteTask"/>
+<div class="task-list" t-on-toggle-task="toggleTask" t-on-delete-task="deleteTask">
 ```
 ```js
-deleteTask(task) {
+deleteTask(ev) {
-    const index = this.tasks.findIndex(t => t.id === task.id);
+    const index = this.tasks.findIndex(t => t.id === ev.detail.id);
    this.tasks.splice(index, 1);
 }
 ```
 Notice that the `onDelete` prop is defined with a `.bind` suffix: this is a special
 suffix that makes sure the function callback is bound to the component.
 ## 10. Using a store
-Looking at the code, it is apparent that all the code handling tasks is scattered
+Looking at the code, it is apparent that we now have code to handle tasks
-all around the application. Also, it mixes UI code and business logic
+scattered in more than one place. Also, it mixes UI code and business logic
-code. Owl does not provide any high level abstraction to manage business logic,
+code. Owl has a way to manage state separately from the user interface: a
-but it is easy to do it with the basic reactivity primitives (`useState` and `reactive`).
+[`Store`](../reference/store.md).
-Let us use it in our application to implement a central store. This is a pretty
+Let us use it in our application. This is a pretty large refactoring (for our
-large refactoring (for our application), since it involves extracting all task
+application), since it involves extracting all task related code out of the
-related code out of the components. Here is the new content of the `app.js` file:
+components. Here is the new content of the `app.js` file:
 ```js
-const { Component, mount, xml, useRef, onMounted, useState, reactive, useEnv } = owl;
+const { Component, Store } = owl;
 const { xml } = owl.tags;
 const { whenReady } = owl.utils;
 const { useRef, useDispatch, useStore } = owl.hooks;
 // -------------------------------------------------------------------------
 // Store
 // -------------------------------------------------------------------------
-function useStore() {
+const actions = {
-  const env = useEnv();
+  addTask({ state }, title) {
-  return useState(env.store);
+    title = title.trim();
-}
+    if (title) {
 // -------------------------------------------------------------------------
 // TaskList
 // -------------------------------------------------------------------------
 class TaskList {
  nextId = 1;
  tasks = [];
  addTask(text) {
    text = text.trim();
    if (text) {
      const task = {
-        id: this.nextId++,
+        id: state.nextId++,
-        text: text,
+        title: title,
-        isCompleted: false,
+        isCompleted: false
      };
-      this.tasks.push(task);
+      state.tasks.push(task);
    }
-  }
+  },
-
+  toggleTask({ state }, id) {
-  toggleTask(task) {
+    const task = state.tasks.find(t => t.id === id);
    task.isCompleted = !task.isCompleted;
  },
  deleteTask({ state }, id) {
    const index = state.tasks.findIndex(t => t.id === id);
    state.tasks.splice(index, 1);
  }
-
+};
-  deleteTask(task) {
+const initialState = {
-    const index = this.tasks.findIndex((t) => t.id === task.id);
+  nextId: 1,
-    this.tasks.splice(index, 1);
+  tasks: []
-  }
+};
 }
 function createTaskStore() {
  return reactive(new TaskList());
 }
 // -------------------------------------------------------------------------
 // Task Component
 // -------------------------------------------------------------------------
-class Task extends Component {
+const TASK_TEMPLATE = xml/* xml */ `
  static template = xml/* xml */ `
    <div class="task" t-att-class="props.task.isCompleted ? 'done' : ''">
-      <input type="checkbox" t-att-checked="props.task.isCompleted" t-on-click="() => store.toggleTask(props.task)"/>
+        <input type="checkbox" t-att-checked="props.task.isCompleted"
-      <span><t t-esc="props.task.text"/></span>
+                t-on-click="dispatch('toggleTask', props.task.id)"/>
-      <span class="delete" t-on-click="() => store.deleteTask(props.task)">🗑</span>
+        <span><t t-esc="props.task.title"/></span>
        <span class="delete" t-on-click="dispatch('deleteTask', props.task.id)">🗑</span>
    </div>`;
 class Task extends Component {
  static template = TASK_TEMPLATE;
  static props = ["task"];
-
+  dispatch = useDispatch();
  setup() {
    this.store = useStore();
  }
 }
 // -------------------------------------------------------------------------
-// Root Component
+// App Component
 // -------------------------------------------------------------------------
-class Root extends Component {
+const APP_TEMPLATE = xml/* xml */ `
  static template = xml/* xml */ `
    <div class="todo-app">
-      <input placeholder="Enter a new task" t-on-keyup="addTask" t-ref="add-input"/>
+        <input placeholder="Enter a new task" t-on-keyup="addTask" t-ref="add-input"/>
-      <div class="task-list">
+        <div class="task-list">
-        <t t-foreach="store.tasks" t-as="task" t-key="task.id">
+            <t t-foreach="tasks" t-as="task" t-key="task.id">
-          <Task task="task"/>
+                <Task task="task"/>
-        </t>
+            </t>
-      </div>
+        </div>
    </div>`;
 class App extends Component {
  static template = APP_TEMPLATE;
  static components = { Task };
-  setup() {
+  inputRef = useRef("add-input");
-    const inputRef = useRef("add-input");
+  tasks = useStore(state => state.tasks);
-    onMounted(() => inputRef.el.focus());
+  dispatch = useDispatch();
-    this.store = useStore();
+
  mounted() {
    this.inputRef.el.focus();
  }
  addTask(ev) {
    // 13 is keycode for ENTER
    if (ev.keyCode === 13) {
-      this.store.addTask(ev.target.value);
+      this.dispatch("addTask", ev.target.value);
      ev.target.value = "";
    }
  }
 }
 // -------------------------------------------------------------------------
-// Setup
+// Setup code
 // -------------------------------------------------------------------------
-const env = {
+function setup() {
-  store: createTaskStore(),
+  owl.config.mode = "dev";
-};
+  const store = new Store({ actions, state: initialState });
-mount(Root, document.body, { dev: true, env });
+  App.env.store = store;
  const app = new App();
  app.mount(document.body);
 }
 whenReady(setup);
 ```
-## 11. Saving tasks in local storage
+## 11-Saving tasks in local storage
 Now, our TodoApp works great, except if the user closes or refresh the browser!
 It is really inconvenient to only keep the state of the application in memory.
 To fix this, we will save the tasks in the local storage. With our current
-codebase, it is a simple change: we need to save tasks to local storage and
+codebase, it is a simple change: only the setup code needs to be updated.
 listen to any change.
 ```js
-class TaskList {
+function makeStore() {
-  constructor(tasks) {
+  const localState = window.localStorage.getItem("todoapp");
-    this.tasks = tasks || [];
+  const state = localState ? JSON.parse(localState) : initialState;
-    const taskIds = this.tasks.map((t) => t.id);
+  const store = new Store({ state, actions });
-    this.nextId = taskIds.length ? Math.max(...taskIds) + 1 : 1;
+  store.on("update", null, () => {
-  }
+    localStorage.setItem("todoapp", JSON.stringify(store.state));
-  // ...
+  });
  return store;
 }
-function createTaskStore() {
+function setup() {
-  const saveTasks = () => localStorage.setItem("todoapp", JSON.stringify(taskStore.tasks));
+  owl.config.mode = "dev";
-  const initialTasks = JSON.parse(localStorage.getItem("todoapp") || "[]");
+  App.env.store = makeStore();
-  const taskStore = reactive(new TaskList(initialTasks), saveTasks);
+  const app = new App();
-  saveTasks();
+  app.mount(document.body);
  return taskStore;
 }
 ```
-The key point is that the `reactive` function takes a callback that will be called
+The key point is to use the fact that the store is an
-every time an observed value is changed. Note that we need to call the `saveTasks`
+[`EventBus`](../reference/event_bus.md) which triggers an `update` event
-method initially to make sure we observe all current values.
+whenever it is updated.
 ## 12. Filtering tasks
 We are almost done, we can add/update/delete tasks. The only missing feature is
 the possibility to display the task according to their completed status. We will
-need to keep track of the state of the filter in `Root`, then filter the visible
+need to keep track of the state of the filter in `App`, then filter the visible
 tasks according to its value.
 ```js
-class Root extends Component {
+// on top of file, readd useState:
-  static template = xml /* xml */`
+const { useRef, useDispatch, useState, useStore } = owl.hooks;
-    <div class="todo-app">
+
-      <input placeholder="Enter a new task" t-on-keyup="addTask" t-ref="add-input"/>
+// in App:
-      <div class="task-list">
+filter = useState({value: "all"})
 get displayedTasks() {
    switch (this.filter.value) {
        case "active": return this.tasks.filter(t => !t.isCompleted);
        case "completed": return this.tasks.filter(t => t.isCompleted);
        case "all": return this.tasks;
    }
 }
 setFilter(filter) {
    this.filter.value = filter;
 }
 ```
 Finally, we need to display the visible filters. We can do that, and at the
 same time, display the number of tasks in a small panel below the main list:
 ```xml
 <div class="todo-app">
    <input placeholder="Enter a new task" t-on-keyup="addTask" t-ref="add-input"/>
    <div class="task-list">
        <t t-foreach="displayedTasks" t-as="task" t-key="task.id">
-          <Task task="task"/>
+            <Task task="task"/>
        </t>
-      </div>
+    </div>
-      <div class="task-panel" t-if="store.tasks.length">
+    <div class="task-panel" t-if="tasks.length">
        <div class="task-counter">
-          <t t-esc="displayedTasks.length"/>
+            <t t-esc="displayedTasks.length"/>
-          <t t-if="displayedTasks.length lt store.tasks.length">
+            <t t-if="displayedTasks.length lt tasks.length">
-              / <t t-esc="store.tasks.length"/>
+                / <t t-esc="tasks.length"/>
-          </t>
+            </t>
-          task(s)
+            task(s)
        </div>
        <div>
-          <span t-foreach="['all', 'active', 'completed']"
+            <span t-foreach="['all', 'active', 'completed']"
-            t-as="f" t-key="f"
+                t-as="f" t-key="f"
-            t-att-class="{active: filter.value===f}"
+                t-att-class="{active: filter.value===f}"
-            t-on-click="() => this.setFilter(f)"
+                t-on-click="setFilter(f)"
-            t-esc="f"/>
+                t-esc="f"/>
        </div>
-      </div>
+    </div>
-    </div>`;
+</div>
  setup() {
    ...
    this.filter = useState({ value: "all" });
  }
  get displayedTasks() {
    const tasks = this.store.tasks;
    switch (this.filter.value) {
      case "active": return tasks.filter(t => !t.isCompleted);
      case "completed": return tasks.filter(t => t.isCompleted);
      case "all": return tasks;
    }
  }
  setFilter(filter) {
    this.filter.value = filter;
  }
 }
 ```
 ```css
@@ -722,8 +755,8 @@ class Root extends Component {
 }
 ```
-Notice here that we set dynamically the css class of the filter with the object
+Notice here that we set dynamically the class of the filter with the object
-syntax.
+syntax: each key is a class that we want to set if its value is truthy.
 ## 13. The Final Touch
@@ -738,16 +771,16 @@ the user experience.
 }
 ```
-2. Make the text of a task clickable, to toggle its checkbox:
+2. Make the title of a task clickable, to toggle its checkbox:
 ```xml
 <input type="checkbox" t-att-checked="props.task.isCompleted"
    t-att-id="props.task.id"
    t-on-click="dispatch('toggleTask', props.task.id)"/>
-<label t-att-for="props.task.id"><t t-esc="props.task.text"/></label>
+<label t-att-for="props.task.id"><t t-esc="props.task.title"/></label>
 ```
-3. Strike the text of completed task:
+3. Strike the title of completed task:
 ```css
 .task.done label {
@@ -778,146 +811,144 @@ For reference, here is the final code:
 ```
 ```js
-(function () {
+(function() {
-  const { Component, mount, xml, useRef, onMounted, useState, reactive, useEnv } = owl;
+  const { Component, Store } = owl;
  const { xml } = owl.tags;
  const { whenReady } = owl.utils;
  const { useRef, useDispatch, useState, useStore } = owl.hooks;
  // -------------------------------------------------------------------------
  // Store
  // -------------------------------------------------------------------------
-  function useStore() {
+  const actions = {
-    const env = useEnv();
+    addTask({ state }, title) {
-    return useState(env.store);
+      title = title.trim();
-  }
+      if (title) {
  // -------------------------------------------------------------------------
  // TaskList
  // -------------------------------------------------------------------------
  class TaskList {
    constructor(tasks) {
      this.tasks = tasks || [];
      const taskIds = this.tasks.map((t) => t.id);
      this.nextId = taskIds.length ? Math.max(...taskIds) + 1 : 1;
    }
    addTask(text) {
      text = text.trim();
      if (text) {
        const task = {
-          id: this.nextId++,
+          id: state.nextId++,
-          text: text,
+          title: title,
-          isCompleted: false,
+          isCompleted: false
        };
-        this.tasks.push(task);
+        state.tasks.push(task);
      }
-    }
+    },
-
+    toggleTask({ state }, id) {
-    toggleTask(task) {
+      const task = state.tasks.find(t => t.id === id);
      task.isCompleted = !task.isCompleted;
    },
    deleteTask({ state }, id) {
      const index = state.tasks.findIndex(t => t.id === id);
      state.tasks.splice(index, 1);
    }
  };
-    deleteTask(task) {
+  const initialState = {
-      const index = this.tasks.findIndex((t) => t.id === task.id);
+    nextId: 1,
-      this.tasks.splice(index, 1);
+    tasks: []
-    }
+  };
  }
  function createTaskStore() {
    const saveTasks = () => localStorage.setItem("todoapp", JSON.stringify(taskStore.tasks));
    const initialTasks = JSON.parse(localStorage.getItem("todoapp") || "[]");
    const taskStore = reactive(new TaskList(initialTasks), saveTasks);
    saveTasks();
    return taskStore;
  }
  // -------------------------------------------------------------------------
  // Task Component
  // -------------------------------------------------------------------------
  const TASK_TEMPLATE = xml/* xml */ `
    <div class="task" t-att-class="props.task.isCompleted ? 'done' : ''">
        <input type="checkbox" t-att-checked="props.task.isCompleted"
            t-att-id="props.task.id"
            t-on-click="dispatch('toggleTask', props.task.id)"/>
        <label t-att-for="props.task.id"><t t-esc="props.task.title"/></label>
        <span class="delete" t-on-click="dispatch('deleteTask', props.task.id)">🗑</span>
    </div>`;
  class Task extends Component {
-    static template = xml/* xml */ `
+    static template = TASK_TEMPLATE;
      <div class="task" t-att-class="props.task.isCompleted ? 'done' : ''">
        <input type="checkbox"
          t-att-id="props.task.id"
          t-att-checked="props.task.isCompleted"
          t-on-click="() => store.toggleTask(props.task)"/>
        <label t-att-for="props.task.id"><t t-esc="props.task.text"/></label>
        <span class="delete" t-on-click="() => store.deleteTask(props.task)">🗑</span>
      </div>`;
    static props = ["task"];
-
+    dispatch = useDispatch();
    setup() {
      this.store = useStore();
    }
  }
  // -------------------------------------------------------------------------
-  // Root Component
+  // App Component
  // -------------------------------------------------------------------------
-  class Root extends Component {
+  const APP_TEMPLATE = xml/* xml */ `
-    static template = xml/* xml */ `
+    <div class="todo-app">
      <div class="todo-app">
        <input placeholder="Enter a new task" t-on-keyup="addTask" t-ref="add-input"/>
        <div class="task-list">
-          <t t-foreach="displayedTasks" t-as="task" t-key="task.id">
+            <Task t-foreach="displayedTasks" t-as="task" t-key="task.id" task="task"/>
            <Task task="task"/>
          </t>
        </div>
-        <div class="task-panel" t-if="store.tasks.length">
+        <div class="task-panel" t-if="tasks.length">
-          <div class="task-counter">
+            <div class="task-counter">
-            <t t-esc="displayedTasks.length"/>
+                <t t-esc="displayedTasks.length"/>
-            <t t-if="displayedTasks.length lt store.tasks.length">
+                <t t-if="displayedTasks.length lt tasks.length">
-                / <t t-esc="store.tasks.length"/>
+                    / <t t-esc="tasks.length"/>
-            </t>
+                </t>
-            task(s)
+                task(s)
-          </div>
+            </div>
-          <div>
+            <div>
-            <span t-foreach="['all', 'active', 'completed']"
+                <span t-foreach="['all', 'active', 'completed']"
-              t-as="f" t-key="f"
+                    t-as="f" t-key="f"
-              t-att-class="{active: filter.value===f}"
+                    t-att-class="{active: filter.value===f}"
-              t-on-click="() => this.setFilter(f)"
+                    t-on-click="setFilter(f)"
-              t-esc="f"/>
+                    t-esc="f"/>
-          </div>
+            </div>
        </div>
-      </div>`;
+    </div>`;
  class App extends Component {
    static template = APP_TEMPLATE;
    static components = { Task };
-    setup() {
+    inputRef = useRef("add-input");
-      const inputRef = useRef("add-input");
+    tasks = useStore(state => state.tasks);
-      onMounted(() => inputRef.el.focus());
+    filter = useState({ value: "all" });
-      this.store = useStore();
+    dispatch = useDispatch();
-      this.filter = useState({ value: "all" });
+
    mounted() {
      this.inputRef.el.focus();
    }
    addTask(ev) {
      // 13 is keycode for ENTER
      if (ev.keyCode === 13) {
-        this.store.addTask(ev.target.value);
+        this.dispatch("addTask", ev.target.value);
        ev.target.value = "";
      }
    }
    get displayedTasks() {
      const tasks = this.store.tasks;
      switch (this.filter.value) {
        case "active":
-          return tasks.filter((t) => !t.isCompleted);
+          return this.tasks.filter(t => !t.isCompleted);
        case "completed":
-          return tasks.filter((t) => t.isCompleted);
+          return this.tasks.filter(t => t.isCompleted);
        case "all":
-          return tasks;
+          return this.tasks;
      }
    }
    setFilter(filter) {
      this.filter.value = filter;
    }
  }
  // -------------------------------------------------------------------------
-  // Setup
+  // Setup code
  // -------------------------------------------------------------------------
-  const env = { store: createTaskStore() };
+  function makeStore() {
-  mount(Root, document.body, { dev: true, env });
+    const localState = window.localStorage.getItem("todoapp");
    const state = localState ? JSON.parse(localState) : initialState;
    const store = new Store({ state, actions });
    store.on("update", null, () => {
      localStorage.setItem("todoapp", JSON.stringify(store.state));
    });
    return store;
  }
  function setup() {
    owl.config.mode = "dev";
    App.env.store = makeStore();
    const app = new App();
    app.mount(document.body);
  }
  whenReady(setup);
 })();
 ```
@@ -1,180 +0,0 @@
 # 🦉 Why Owl ? 🦉
 The common wisdom is that one should not reinvent the wheel, because that would
 waste effort and resources. It is certainly true in many cases. A javascript
 framework is a considerable investment, so it is quite logical to ask the question:
 why did Odoo decide to make OWL instead of using a standard/well known framework,
 such as React or Vue?
 As you might expect, the answer to that question is not simple. But most of the
 reasons discussed in this page are a consequence from a single fact: Odoo is
 extremely modular.
 This means, for example, that the core parts of Odoo are not aware, before runtime,
 of what files will be loaded/executed, or what will be the state of the UI. Because
 of that, Odoo cannot rely on a standard build toolchain. Also, this implies that
 the core parts of Odoo need to be extremely generic. In other words, Odoo is not
 really an application with a user interface. It is an application which generates
 a dynamic user interface. And most frameworks are not up to the task.
 Betting on Owl was not an easy choice to make, because there certainly are a lot
 of conflicting needs that we want to carefully balance. Choosing anything other
 than a well known framework is bound to be controversial. This page will explain
 some of the reason why we still believe that building Owl is a worthwile
 endeavour.
 ## Strategy
 It is true that we want to keep control of our technology, in the sense that we
 do not want to depend on Facebook or Google, or any other large (or small)
 company. If they decide to change their license, or to go in a direction that
 will not work for us, this may be a problem. This is even more true because
 Odoo is not a conventional javascript application, and our needs are probably
 quite different as most other applications.
 ## Class components
 It is clear that the biggest frameworks are moving away from class components.
 There is an implicit assumption that class components are terrible, and that
 functional programming is the way to go. React even goes as far as to say that
 classes are confusing for developers.
 While there is some truth to that, and to the fact that composition is certainly
 a good mechanism for code reuse, we believe that classes and inheritance are
 important tools.
 Sharing code between generic components with inheritance is the way Odoo built
 its web client. And it is clear that inheritance is not the root of all evils.
 It is often a perfectly simple and appropriate solution. What matter most is
 the architectural decisions.
 Also, Odoo has another specific use out of class components: each method of a
 class provides an extension point for addons. This may not be a clean architecture
 pattern, but it is a pragmatic decision that served Odoo well: classes are
 sometimes monkey-patched to add behaviour from the outside. A little bit like
 mixins, but from the outside.
 Using React or Vue would make it significantly harder to monkey patch components,
 because a lot of the state is hidden in their internals.
 ## Tooling
 React or Vue have a huge community, and a lot of effort have been made into their
 tooling. This is wonderful, but at the same time, a pretty big issue for Odoo:
 since the assets are totally dynamic (and could change whenever the user installs
 or removes an addon), we need to have all that kind of tooling on the production
 servers. This is certainly not ideal.
 Also, this makes it very complicated to setup Vue or React tools: Odoo code is
 not a simple file that import other files. It changes all the time, assets
 are bundled differently in different contexts. This is the reason why Odoo has
 its own module system, which are resolved at runtime, by the browser. The
 dynamic nature of Odoo means that we often need to delay work as late as possible
 (in other word, we want a JIT user interface!)
 Our ideal framework has minimal (mandatory) tooling, which makes it easier to
 deploy. Using React without JSX, or Vue without vue file is not very appealing.
 At the same time, Owl is designed to solve this issue: it compiles templates
 by the browser, it doesn't need much code for that, since we use the XML parser
 built into each browser. Owl works with or without any additional tooling. It
 can use template strings to write single file components, and is easy to integrate
 in any html page, with a simple `<script>` tag.
 ## Template based
 Odoo stores templates as XML documents in a database. This is very powerful, since
 this allow the use of xpaths to customize other templates. This is a very
 important feature of odoo, and one of the key to Odoo modularity.
 Because of that, we still expect to write our templates in an XML document.
 Weirdly enough, no major framework uses XML to store templates, even though it
 is extremely convenient.
 So, using React or Vue means that we need to make a template compiler. For React,
 that would be a compiler that would take a QWeb template, and convert it to a
 React render function. For Vue, it would convert it to a Vue template. Then
 we need to bundle the vue template compiler as well.
 Not only this would be complex (compiling a templating language into another is
 not an easy task), but it would negatively impact the developer experience as
 well. Writing Vue or React components in a QWeb template would certainly be
 awkward, and very confusing.
 ## Developer Experience
 This brings us to the following point: developer experience. We see this choice
 as an investment for the future, and we want to make onboarding developers as
 easy as possible.
 While many javascript professionals clearly think that react/vue is not difficult
 (which is true to some extent), it is alsy true that many non js specialists are
 overwhelmed with the frontend world: functional components, hooks, and many other
 fancy words. Also, what is available in the compilation context may be difficult,
 there is a lot of black magic going on in pretty much every framework. Vue
 somehow join various namespaces into one, under the hood, and add various internal
 keys. Svelte transform the code. React require that state transformations are
 deep, and not shallow.
 Owl is trying very hard to have a simple and familiar API. It uses classes. Its
 reactivity system is explicit, not implicit. The scoping rules are obvious. In
 case of doubt, we err on the side of not implementing a feature.
 It is certainly different from React or Vue, but at the same time, kind of
 familiar for experienced developers.
 ## JIT compilation
 There is also a clear trend in the frontend world to compile code
 as much as possible ahead of time. Most frameworks will compile templates ahead
 of time. And now Svelte is trying to compile the JS code away, so it can remove
 itself from the bundle.
 This is certainly reasonable for many usecases. However, this is not what Odoo
 needs: Odoo will fetch templates from the database and need to compile them only
 at the last possible moment, so we can apply all necessary xpaths.
 Even more: Odoo needs to be able to generate (and compile) templates at runtime.
 Currently, Odoo form views interpret an xml description. But the form view code
 then needs to do a lot of complicated operations. With Owl, we will be able to
 transform a view description into a QWeb template, then compile that and use it
 immediately.
 ## Reactivity
 There are other design choices that we feel are not optimal in other frameworks.
 For example, the reactivity system. We like the way Vue did it, but it has a
 flaw: it is not really optional. There is actually a way to opt out of the reactivity
 system by freezing the state, but then, it is freezed.
 And there certainly are situations where we need a state, which is not read-only,
 and not observed. For example, imagine a spreadsheet component. It may have a
 very large internal state, and it knows exactly when it needs to be rendered
 (basically, whenever the user performs some action). Then, observing its state
 is a net performance loss, both for the CPU and the memory.
 ## Concurrency
 Many applications are happy to simply display a spinner whenever a new asynchronous
 action is performed, but Odoo wants a different user experience: most asynchronous
 state changes are not displayed until ready. This is sometimes called a concurrent
 mode: the UI is rendered in memory, and displayed only when it is ready (and
 only if it has not been cancelled by subsequent user actions).
 React has now an experimental concurrent mode, but it was not ready when Owl
 started. Vue has not really an equivalent API (suspense is not what we need).
 Also, React concurrent mode is complex to use. Concurrency was one of the rare
 strong point of the former Odoo js framework (widgets), and we feel that Owl has
 now a very strong concurrent mode, which is simple and powerful at the same time.
 ## Conclusion
 This lengthy discussion showed that there are many small and not so small reasons
 that current standard frameworks are not tailored to our needs. It is perfectly
 fine, because they each chose a different set of tradeoffs.
 However, we feel that there is still room in the framework world for something
 that is different. For a framework that makes choices compatible with Odoo.
 And that is why we built Owl 🦉.
@@ -0,0 +1,77 @@
 # 🦉 OWL Documentation 🦉
 ## Reference
 - [Animations](reference/animations.md)
 - [Component](reference/component.md)
 - [Concurrency Model](reference/concurrency_model.md)
 - [Configuration](reference/config.md)
 - [Context](reference/context.md)
 - [Environment](reference/environment.md)
 - [Event Bus](reference/event_bus.md)
 - [Hooks](reference/hooks.md)
 - [Miscellaneous Components](reference/misc.md)
 - [Observer](reference/observer.md)
 - [Props](reference/props.md)
 - [Props Validation](reference/props_validation.md)
 - [QWeb Templating Language](reference/qweb_templating_language.md)
 - [QWeb Engine](reference/qweb_engine.md)
 - [Router](reference/router.md)
 - [Store](reference/store.md)
 - [Tags](reference/tags.md)
 - [Utils](reference/utils.md)
 ## Learning Resources
 - [Quick Start: create an (almost) empty Owl application](learning/quick_start.md)
 - [Tutorial: create a TodoList application](learning/tutorial_todoapp.md)
 - [Testing Owl components](learning/testing_components.md)
 ## Miscellaneous
 - [Comparison with React/Vue](comparison.md)
 - [Tooling](tooling.md)
 - [Templates to start Owl applications (external link)](https://github.com/ged-odoo/owl-templates)
 ## Architecture
 This section explains in more detail the inner workings of Owl. It is targeted
 for developers working on Owl itself.
 - [Virtual DOM](architecture/vdom.md)
 - [Rendering](architecture/rendering.md)
 ## Owl Content
 Here is a complete visual representation of everything exported by the `owl`
 global object (so, for example, `Component` is available at `owl.Component`,
 and `EventBus` is exported as `owl.core.EventBus`):
 ```
 Component                               misc
 Context                                     AsyncRoot
 QWeb                                    router
 Store                                       Link
 useState                                    RouteComponent
 config                                      Router
    mode                                tags
 core                                        xml
    EventBus                            utils
    Observer                                debounce
 hooks                                       escape
    onWillStart                             loadJS
    onMounted                               loadFile
    onWillUpdateProps                       shallowEqual
    onWillPatch                             whenReady
    onPatched
    onWillUnmount
    useContext
    useState
    useRef
    useSubEnv
    useStore
    useDispatch
    useGetters
 ```
 Note that for convenience, the `useState` hook is also exported at the root of the `owl` object.
@@ -52,20 +52,21 @@ sequence of events will happen:
 At node insertion:
 - the css classes `name-enter` and `name-enter-active` will be added directly
-  when the node is inserted into the DOM.
+  when the node is inserted into the DOM,
 - on the next animation frame: the css class `name-enter` will be removed and the
  class `name-enter-to` will be added (so they can be used to trigger css
-  transition effects).
+  transition effects),
- at the end of the transition, `name-enter-to` and `name-enter-active` will be removed.
+- the css class `name-enter-active` will be removed whenever a css transition
  ends.
 At node destruction:
 - the css classes `name-leave` and `name-leave-active` will be added before the
-  node is removed to the DOM.
+  node is removed to the DOM,
- on the next animation frame: the css class `name-leave` will be removed and the
+- the css class `name-leave` will be removed on the next animation frame (so it
-  class `name-leave-to` will be added (so they can be used to trigger css
+  can be used to trigger css transition effects),
-  transition effects).
+- the css class `name-leave-active` will be removed whenever a css transition
- at the end of the transition, `name-leave-to` and `name-leave-active` will be removed.
+  ends. Only then will the element be removed from the DOM.
 For example, a simple fade in/out effect can be done with this:
@@ -92,36 +93,3 @@ Notes:
 Owl does not support more than one transition on a single node, so the
 `t-transition` expression must be a single value (i.e. no space allowed).
 ## SCSS Mixins
 If you use SCSS, you can use mixins to make generic animations. Here is an exemple with a fade in / fade out animation:
 ```scss
@mixin animation-fade($time, $name) {
  .#{$name}_fade-enter-active,
  .#{$name}_fade-active {
    transition: all $time;
  }
  .#{$name}_fade-enter {
    opacity: 0;
  }
  .#{$name}_fade-leave-to {
    opacity: 0;
  }
 }
 ```
 Usage:
 ```scss
@include animation-fade(0.5s, "o_notification");
 ```
 You can now have in your template:
 ```xml
 <SomeTag  t-transition="o_notification_fade"/>
 ```
@@ -1,33 +0,0 @@
 # 🦉 Browser 🦉
 ## Content
 - [Overview](#overview)
 - [Browser Content](#browser-content)
 ## Overview
 The browser object contains some browser native APIs, such as `setTimeout`, that
 are used by Owl and its utility functions. They are exposed with the intent of
 making them mockable if necessary.
 ```js
 owl.browser.setTimeout === window.setTimeout; // return true
 ```
 For now, this object contains some functions that are not used by Owl. They
 will eventually be removed in Owl 2.0.
 ## Browser Content
 More specifically, the `browser` object contains the following methods and objects:
 - `setTimeout`
 - `clearTimeout`
 - `setInterval`
 - `clearInterval`
 - `requestAnimationFrame`
 - `random`
 - `Date`
 - `fetch`
 - `localStorage`
@@ -10,22 +10,16 @@
  - [Static Properties](#static-properties)
  - [Methods](#methods)
  - [Lifecycle](#lifecycle)
    - [`constructor(parent, props)`](#constructorparent-props)
    - [`setup()`](#setup)
    - [`willStart()`](#willstart)
    - [`mounted()`](#mounted)
    - [`willUpdateProps(nextProps)`](#willupdatepropsnextprops)
    - [`willPatch()`](#willpatch)
    - [`patched(snapshot)`](#patchedsnapshot)
    - [`willUnmount()`](#willunmount)
    - [`catchError(error)`](#catcherrorerror)
  - [Root Component](#root-component)
  - [Composition](#composition)
  - [Event Handling](#event-handling)
  - [Form Input Bindings](#form-input-bindings)
  - [References](#references)
  - [Slots](#slots)
  - [Dynamic sub components](#dynamic-sub-components)
  - [Error Handling](#error-handling)
  - [Functional Components](#functional-components)
-  - [SVG Components](#svg-components)
+  - [SVG components](#svg-components)
 ## Overview
@@ -213,7 +207,7 @@ to be called in the constructor.
  class Counter extends owl.Component {
    static props = {
      initialValue: Number,
-      optional: true,
+      optional: true
    };
  }
  ```
@@ -226,15 +220,11 @@ to be called in the constructor.
  ```js
  class Counter extends owl.Component {
    static defaultProps = {
-      initialValue: 0,
+      initialValue: 0
    };
  }
  ```
 - **`style`** (string, optional): it should be the return value of the [`css` tag](tags.md#css-tag),
  which is used to inject stylesheet whenever the component is visible on the
  screen.
 There is another static property defined on the `Component` class: `current`.
 This property is set to the currently being defined component (in the constructor).
 This is the way [hooks](hooks.md) are able to get a reference to the target
@@ -244,26 +234,15 @@ component.
 We explain here all the public methods of the `Component` class.
- **`mount(target, options)`** (async): this is the main way a
+- **`mount(target)`** (async): this is the main way a
  component is added to the DOM: the root component is mounted to a target
  HTMLElement (or document fragment). Obviously, this is asynchronous, since each children need to be
  created as well. Most applications will need to call `mount` exactly once, on
  the root component.
  The `options` argument is an optional object with a `position` key. The
  `position` key can have three possible values: `first-child`, `last-child`, `self`.
  - `first-child`: with this option, the component will be prepended inside the target,
  - `last-child` (default value): with this option, the component will be
    appended in the target element,
  - `self`: the target will be used as the root element for the component. This
    means that the target has to be an HTMLElement (and not a document fragment).
    In this situation, it is possible that the component cannot be unmounted. For
    example, if its target is `document.body`.
  Note that if a component is mounted, unmounted and remounted, it will be
  automatically re-rendered to ensure that changes in its state (or something
-  in the environment) will be taken into account.
+  in the environment, or in the store, or ...) will be taken into account.
  If a component is mounted inside an element or a fragment which is not in the
  DOM, then it will be rendered fully, but not active: the `mounted` hooks will
@@ -279,34 +258,25 @@ We explain here all the public methods of the `Component` class.
  // app is now visible
  ```
-  Note that the normal way of mounting an application is by using the `mount`
+- **`unmount()`**: in case a component needs to be detached/removed from the DOM, this
  method on a component class, not by creating the instance by hand. See the
  documentation on [mounting applications](mounting.md).
 * **`unmount()`**: in case a component needs to be detached/removed from the DOM, this
  method can be used. Most applications should not call `unmount`, this is more
  useful to the underlying component system.
-* **`render()`** (async): calling this method directly will cause a rerender. Note
+- **`render()`** (async): calling this method directly will cause a rerender. Note
  that this should be very rare to have to do it manually, the Owl framework is
  most of the time responsible for doing that at an appropriate moment.
  Note that the render method is asynchronous, so one cannot observe the updated
  DOM in the same stack frame.
-* **`shouldUpdate(nextProps)`**: this method is called each time a component's props
+- **`shouldUpdate(nextProps)`**: this method is called each time a component's props
  are updated. It returns a boolean, which indicates if the component should
  ignore a props update. If it returns false, then `willUpdateProps` will not
  be called, and no rendering will occur. Its default implementation is to
-  always return true. Note that this is an optimization, similar to React's `shouldComponentUpdate`. Most of the time, this should not be used, but it
+  always return true. This is an optimization, similar to React's `shouldComponentUpdate`. Most of the time, this should not be used, but it
-  can be useful if we are handling large number of components. Since this is an
+  can be useful if we are handling large number of components.
  optimization, Owl has the freedom to ignore the result of `shouldUpdate` in
  some cases (for example, if a component is remounted, or if we want to force
  a full rerender of the UI). However, if `shouldUpdate` returns true, then Owl
  provides the guarantee that the component will be rendered at some point in
  the future (except if the component is destroyed or if some part of the UI crashes).
-* **`destroy()`**. As its name suggests, this method will remove the component,
+- **`destroy()`**. As its name suggests, this method will remove the component,
  and perform all necessary cleanup, such as unmounting the component, its children,
  removing the parent/children relationship. This method should almost never be
  called directly (except maybe on the root component), but should be done by the
@@ -323,16 +293,16 @@ A solid and robust component system needs useful hooks/methods to help
 developers write components. Here is a complete description of the lifecycle of
 a owl component:
-| Method                                           | Description                                                 |
+| Method                                           | Description                                                  |
-| ------------------------------------------------ | ----------------------------------------------------------- |
+| ------------------------------------------------ | ------------------------------------------------------------ |
-| **[setup](#setup)**                              | setup                                                       |
+| **[constructor](#constructorparent-props)**      | constructor                                                  |
-| **[willStart](#willstart)**                      | async, before first rendering                               |
+| **[willStart](#willstart)**                      | async, before first rendering                                |
-| **[mounted](#mounted)**                          | just after component is rendered and added to the DOM       |
+| **[mounted](#mounted)**                          | just after component is rendered and added to the DOM        |
-| **[willUpdateProps](#willupdatepropsnextprops)** | async, before props update                                  |
+| **[willUpdateProps](#willupdatepropsnextprops)** | async, before props update                                   |
-| **[willPatch](#willpatch)**                      | just before the DOM is patched                              |
+| **[willPatch](#willpatch)**                      | just before the DOM is patched                               |
-| **[patched](#patchedsnapshot)**                  | just after the DOM is patched                               |
+| **[patched](#patchedsnapshot)**                  | just after the DOM is patched                                |
-| **[willUnmount](#willunmount)**                  | just before removing component from DOM                     |
+| **[willUnmount](#willunmount)**                  | just before removing component from DOM                      |
-| **[catchError](#catcherrorerror)**               | catch errors (see [error handling page](error_handling.md)) |
+| **[catchError](#catcherrorerror)**               | catch errors (see [error handling section](#error-handling)) |
 Notes:
@@ -370,23 +340,6 @@ class ClickCounter extends owl.Component {
 }
 ```
 Hook functions can be called in the constructor.
 #### `setup()`
 _setup_ is run just after the component is constructed. It is a lifecycle method,
 very similar to the _constructor_, except that it does not receive any argument.
 It is a valid method to call hook functions. Note that one of the main reason to
 have the `setup` hook in the component lifecycle is to make it possible to
 monkey patch it. It is a common need in the Odoo ecosystem.
 ```javascript
 setup() {
  useSetupAutofocus();
 }
 ```
 #### `willStart()`
 willStart is an asynchronous hook that can be implemented to
@@ -457,7 +410,7 @@ likely via a change in its state/props or environment).
 This method is not called on the initial render. It is useful to interact
 with the DOM (for example, through an external library) whenever the
-component was patched. Note that this hook will not be called if the component is
+component was patched. Note that this hook will not be called if the compoent is
 not in the DOM.
 Updating the component state in this hook is possible, but not encouraged.
@@ -484,8 +437,8 @@ This is the opposite method of `mounted`.
 #### `catchError(error)`
 The `catchError` method is useful when we need to intercept and properly react
-to (rendering) errors that occur in some sub components. See the page on
+to (rendering) errors that occur in some sub components. See the section on
-[error handling](error_handling.md).
+[error handling](#error-handling).
 ### Root Component
@@ -584,6 +537,118 @@ with a class object:
 <MyComponent t-att-class="{a: state.flagA, b: state.flagB}" />
 ```
 ### Event Handling
 In a component's template, it is useful to be able to register handlers on DOM
 elements to some specific events. This is what makes a template _alive_. There
 are four different use cases.
 1. Register an event handler on a DOM node (_pure_ DOM event)
 2. Register an event handler on a component (_pure_ DOM event)
 3. Register an event handler on a DOM node (_business_ DOM event)
 4. Register an event handler on a component (_business_ DOM event)
 A _pure_ DOM event is directly triggered by a user interaction (e.g. a `click`).
 ```xml
 <button t-on-click="someMethod">Do something</button>
 ```
 This will be roughly translated in javascript like this:
 ```js
 button.addEventListener("click", component.someMethod.bind(component));
 ```
 The suffix (`click` in this example) is simply the name of the actual DOM
 event.
 A _business_ DOM event is triggered by a call to `trigger` on a component.
 ```xml
 <MyComponent t-on-menu-loaded="someMethod" />
 ```
 ```js
 class MyComponent {
     someWhere() {
         const payload = ...;
         this.trigger('menu-loaded', payload);
     }
 }
 ```
 The call to `trigger` generates an `OwlEvent`, a subclass of [_CustomEvent_](https://developer.mozilla.org/docs/Web/Guide/Events/Creating_and_triggering_events)
 with an additional attribute `originalComponent` (the component that triggered
 the event). The generated event is of type `menu-loaded` and dispatches it on
 the component's DOM element (`this.el`). The event bubbles and is cancelable.
 The parent component listening to event `menu-loaded` will receive the payload
 in its `someMethod` handler (in the `detail` property of the event), whenever
 the event is triggered.
 ```js
 class ParentComponent {
     someMethod(ev) {
         const payload = ev.detail;
         ...
     }
 }
 ```
 By convention, we use KebabCase for the name of _business_ events.
 The `t-on` directive allows to prebind its arguments. For example,
 ```xml
 <button t-on-click="someMethod(expr)">Do something</button>
 ```
 Here, `expr` is a valid Owl expression, so it could be `true` or some variable
 from the rendering context.
 One can also directly specify inline statements. For example,
 ```xml
 <button t-on-click="state.counter++">Increment counter</button>
 ```
 Here, `state` must be defined in the rendering context (typically the component)
 as it will be translated to:
 ```js
 button.addEventListener("click", () => {
  component.state.counter++;
 });
 ```
 In order to remove the DOM event details from the event handlers (like calls to
 `event.preventDefault`) and let them focus on data logic, _modifiers_ can be
 specified as additional suffixes of the `t-on` directive.
 | Modifier   | Description                                                       |
 | ---------- | ----------------------------------------------------------------- |
 | `.stop`    | calls `event.stopPropagation()` before calling the method         |
 | `.prevent` | calls `event.preventDefault()` before calling the method          |
 | `.self`    | calls the method only if the `event.target` is the element itself |
 ```xml
 <button t-on-click.stop="someMethod">Do something</button>
 ```
 Note that modifiers can be combined (ex: `t-on-click.stop.prevent`), and that
 the order may matter. For instance `t-on-click.prevent.self` will prevent all
 clicks while `t-on-click.self.prevent` will only prevent clicks on the element
 itself.
 Finally, empty handlers are tolerated as they could be defined only to apply
 modifiers. For example,
 ```xml
 <button t-on-click.stop="">Do something</button>
 ```
 This will simply stop the propagation of the event.
 ### Form Input Bindings
 It is very common to need to be able to read the value out of an html `input` (or
@@ -733,6 +798,62 @@ Note that these two examples uses the suffix `ref` to name the reference. This
 is not mandatory, but it is a useful convention, so we do not forget to access
 it with the `el` or `comp` suffix.
 ### Slots
 To make generic components, it is useful to be able for a parent component to _inject_
 some sub template, but still be the owner. For example, a generic dialog component
 will need to render some content, some footer, but with the parent as the
 rendering context.
 This is what _slots_ are for.
 ```xml
 <div t-name="Dialog" class="modal">
  <div class="modal-title"><t t-esc="props.title"/></div>
  <div class="modal-content">
    <t t-slot="content"/>
  </div>
  <div class="modal-footer">
    <t t-slot="footer"/>
  </div>
 </div>
 ```
 Slots are defined by the caller, with the `t-set` directive:
 ```xml
 <div t-name="SomeComponent">
  <div>some component</div>
  <Dialog title="Some Dialog">
    <t t-set="content">
      <div>hey</div>
    </t>
    <t t-set="footer">
      <button t-on-click="doSomething">ok</button>
    </t>
  </Dialog>
 </div>
 ```
 In this example, the component `Dialog` will render the slots `content` and `footer`
 with its parent as rendering context. This means that clicking on the button
 will execute the `doSomething` method on the parent, not on the dialog.
 Default slot: the first element inside the component which is not a named slot will
 be considered the `default` slot. For example:
 ```xml
 <div t-name="Parent">
  <Child>
    <span>some content</span>
  </Child>
 </div>
 <div t-name="Child">
  <t t-slot="default"/>
 </div>
 ```
 ### Dynamic sub components
 It is not common, but sometimes we need a dynamic component name. In this case,
@@ -778,6 +899,65 @@ component class.
 Note that the `t-component` directive can only be used on `<t>` nodes.
 ### Error Handling
 By default, whenever an error occurs in the rendering of an Owl application, we
 destroy the whole application. Otherwise, we cannot offer any guarantee on the
 state of the resulting component tree. It might be hopelessly corrupted, but
 without any user-visible state.
 Clearly, it sometimes is a little bit extreme to destroy the application. This
 is why we have a builtin mechanism to handle rendering errors (and errors coming
 from lifecycle hooks): the `catchError` hook.
 Whenever the `catchError` lifecycle hook is implemented, all errors coming from
 sub components rendering and/or lifecycle method calls will be caught and given
 to the `catchError` method. This allows us to properly handle the error, and to
 not break the application.
 For example, here is how we could implement an `ErrorBoundary` component:
 ```xml
 <div t-name="ErrorBoundary">
    <t t-if="state.error">
        Error handled
    </t>
    <t t-else="1">
        <t t-slot="default" />
    </t>
 </div>
 ```
 ```js
 class ErrorBoundary extends Component {
  state = useState({ error: false });
  catchError() {
    this.state.error = true;
  }
 }
 ```
 Using the `ErrorBoundary` is then extremely simple:
 ```xml
 <ErrorBoundary><SomeOtherComponent/></ErrorBoundary>
 ```
 Note that we need to be careful here: the fallback UI should not throw any
 error, otherwise we risk going into an infinite loop.
 Also, it may be useful to know that whenever an error is caught, it is then
 broadcasted to the application by an event on the `qweb` instance. It may be
 useful, for example, to log the error somewhere.
 ```js
 env.qweb.on("error", null, function(error) {
  // do something
  // react to the error
 });
 ```
 ### Functional Components
 Owl does not exactly have functional components. However, there is an extremely
@@ -789,7 +969,7 @@ template rendered with `props`. In Owl, this can be done by
 simply defining a template, that will access the `props` object:
 ```js
-const Welcome = xml`<h1>Hello, <t t-esc="props.name"/></h1>`;
+const Welcome = xml`<h1>Hello, {props.name}</h1>`;
 class MyComponent extends Component {
  static template = xml`
@@ -839,8 +1019,8 @@ class RootNode extends Component {
    children: [
      { label: "b" },
      { label: "c", children: [{ label: "d" }, { label: "e" }] },
-      { label: "f", children: [{ label: "g" }] },
+      { label: "f", children: [{ label: "g" }] }
-    ],
+    ]
  };
 }
 ```
@@ -23,7 +23,7 @@ a rendering that is no longer relevant, restart it, reuse it in some cases.
 But even though using concurrency is quite simple (and is the default behaviour),
 asynchrony is difficult, because it introduces an additional dimension that
 vastly increase the complexity of an application. This section will explain
-how Owl manages this complexity, how concurrent rendering works in a general way.
+how Owl manages this complexity, how concuurent rendering works in a general way.
 ## Rendering Components
@@ -120,7 +120,7 @@ Here is what Owl will do:
     1. hook `willUpdateProps` is called on `D` (async)
     2. template `D` is rerendered
   - component `F` is created:
-     1. hook `willStart` is called on `F` (async)
+     1. hook `willStart` is called on `E` (async)
     2. template `F` is rendered
 3. `willPatch` hooks are called recursively on components `C`, `D` (not on `F`,
@@ -137,7 +137,7 @@ Here is what Owl will do:
 Tags are very small helpers to make it easy to write inline templates. There is
 only one currently available tag: `xml`, but we plan to add other tags later,
-such as a `css` tag, which will be used to write [single file components](../learning/how_to_write_sfc.md).
+such as a `css` tag, which will be used to write [single file components](../tooling.md#single-file-component).
 ### Asynchronous Rendering
@@ -158,10 +158,12 @@ There are two different common problems with Owl asynchronous rendering model:
 Here are a few tips on how to work with asynchronous components:
 1. Minimize the use of asynchronous components!
-2. Lazy loading external libraries is a good use case for async rendering. This
+2. Maybe move the asynchronous logic in a store, which then triggers (mostly)
   synchronous renderings
 3. Lazy loading external libraries is a good use case for async rendering. This
   is mostly fine, because we can assume that it will only takes a fraction of a
   second, and only once (see [`owl.utils.loadJS`](utils.md#loadjs))
-3. For all the other cases, the [`AsyncRoot`](misc.md#asyncroot) component is there to help you. When
+4. For all the other cases, the [`AsyncRoot`](misc.md#asyncroot) component is there to help you. When
   this component is met, a new rendering
   sub tree is created, such that the rendering of that component (and its
   children) is not tied to the rendering of the rest of the interface. It can
@@ -2,10 +2,9 @@
 The Owl framework is designed to work in many situations. However, it is
 sometimes necessary to customize some behaviour. This is done by using the
-global `config` object. It provides two settings:
+global `config` object. It currently has one key:
- [`mode`](#mode) (default value: `prod`),
+- [`mode`](#mode).
 - [`enableTransitions`](#enabletransitions) (default value: `true`).
 ## Mode
@@ -26,19 +25,3 @@ So, changing this setting is best done at startup.
 An important job done by the `dev` mode is to validate props for each component
 creation and update. Also, extra props will cause an error.
 ## `enableTransitions`
 Transitions are usually nice, but they can cause issues in some specific cases,
 such as automated tests. It is uncomfortable having to wait for a transition
 to end before moving to the next step.
 To solve this issue, Owl can be configured to ignore the `t-transition` directive.
 To do that, one only needs to set the `enableTransitions` flag to false:
 ```js
 owl.config.enableTransitions = false;
 ```
 Note that it suffers from the same drawback as the "dev" mode: all compiled
 templates, if any, will keep their current behaviours.
@@ -1,36 +0,0 @@
 # 🦉 Owl Content 🦉
 Here is a complete visual representation of everything exported by the `owl`
 global object.
 For example, `Component` is available at `owl.Component` and `EventBus` is
 exported as `owl.core.EventBus`.
 ```
 browser
 Component                               misc
 Context                                     AsyncRoot
 QWeb                                        Portal
 mount
 useState                                tags
 config                                      css
    mode                                    xml
 core                                    utils
    EventBus                                debounce
    Observer                                escape
 hooks                                       loadJS
    onWillStart                             loadFile
    onMounted                               shallowEqual
    onWillUpdateProps                       whenReady
    onWillPatch
    onPatched
    onWillUnmount
    useContext
    useState
    useRef
    useComponent
    useEnv
    useSubEnv
 ```
 Note that for convenience, the `useState` hook is also exported at the root of the `owl` object.
@@ -57,7 +57,7 @@ class SomeComponent extends Component {
      <t t-if=device.isMobile>
          some simplified user interface
      </t>
-      <t t-else="">
+      <t t-else="1">
          a more advanced user interface
      </t>
    </div>`;
@@ -6,7 +6,6 @@
 - [Setting an Environment](#setting-an-environment)
 - [Using a sub environment](#using-a-sub-environment)
 - [Content of an Environment](#content-of-an-environment)
 - [Special keys](#special-keys)
 ## Overview
@@ -41,22 +40,23 @@ all templates.
 Whenever a root component `App` is mounted, Owl will setup a valid environment by
 following the next steps:
- take the `env` object defined on `App.env` (if no `env` was explicitly setup,
+- take the `env` object defined on `App.env` (if no `env` was explicitely setup,
-  this will return the empty `env` object defined on `Component`)
+  this will be return the empty `env` object defined on `Component`)
 - if `env.qweb` is not set, then Owl will create a `QWeb` instance.
 The correct way to customize an environment is to simply set it up on the root
 component class, before the first component is created:
 ```js
-const env = {
+App.env = {
    _t: myTranslateFunction,
    user: {...},
    services: {
        ...
    },
 };
-mount(App, { target: document.body, env });
+const app = new App();
 app.mount(document.body);
 ```
 It is also possible to simply share an environment between all root components,
@@ -93,7 +93,7 @@ Some good use cases for additional keys in the environment are:
 - some configuration keys,
 - session information,
- generic services (such as doing rpcs).
+- generic services (such as doing rpcs, or accessing local storage).
 Doing it this way means that components are easily testable: we can simply
 create a test environment with mock services.
@@ -112,25 +112,16 @@ async function myEnv() {
    qweb: qweb,
    services: {
      localStorage: localStorage,
-      rpc: rpc,
+      rpc: rpc
    },
    debug: false,
-    inMobileMode: true,
+    inMobileMode: true
  };
 }
 async function start() {
-  const env = await myEnv();
+  App.env = await myEnv();
-  mount(App, { target: document.body, env });
+  const app = new App();
  await app.mount(document.body);
 }
 ```
 ## Special Keys
 There are two special key/value added by Owl if not provided in the environment:
 the `QWeb` instance and a `browser` object:
 - `qweb` will be set to an empty `QWeb` instance. This is absolutely necessary
  for Owl to be able to render anything
 - `browser`: this is an object that contains some common access points to the
  browser methods with a side effect. See [browser](browser.md) for more information. Note that the browser object will be removed from the environment in Owl 2.0.
@@ -1,81 +0,0 @@
 # 🦉 Error Handling 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
 ## Overview
 By default, whenever an error occurs in the rendering of an Owl application, we
 destroy the whole application. Otherwise, we cannot offer any guarantee on the
 state of the resulting component tree. It might be hopelessly corrupted, but
 without any user-visible state.
 Clearly, it sometimes is a little bit extreme to destroy the application. This
 is why we have a builtin mechanism to handle rendering errors (and errors coming
 from lifecycle hooks): the `catchError` hook.
 ## Example
 For example, here is how we could implement an `ErrorBoundary` component:
 ```xml
 <div t-name="ErrorBoundary">
    <t t-if="state.error">
        Error handled
    </t>
    <t t-else="">
        <t t-slot="default" />
    </t>
 </div>
 ```
 ```js
 class ErrorBoundary extends Component {
  state = useState({ error: false });
  catchError() {
    this.state.error = true;
  }
 }
 ```
 Using the `ErrorBoundary` is then extremely simple:
 ```xml
 <ErrorBoundary><SomeOtherComponent/></ErrorBoundary>
 ```
 Note that we need to be careful here: the fallback UI should not throw any
 error, otherwise we risk going into an infinite loop (also, see the page on
 [slots](slots.md) for more information on the `t-slot` directive).
 ## Reference
 Whenever the `catchError` lifecycle hook is implemented, all errors coming from
 sub components rendering and/or lifecycle method calls will be caught and given
 to the `catchError` method. This allows us to properly handle the error, and to
 not break the application.
 There are important things to know:
 - If an error that occured in the internal rendering cycle is not caught, then
  Owl will destroy the full application. This is done on purpose, because Owl
  cannot guarantee that the state is not corrupted from this point on.
 - errors coming from event handlers are NOT managed by `catchError` or any other
  owl mechanism. This is up to the application developer to properly recover
  from an error
 Also, it may be useful to know that whenever an error is caught, it is then
 broadcasted to the application by an event on the `qweb` instance. It may be
 useful, for example, to log the error somewhere.
 ```js
 env.qweb.on("error", null, function (error) {
  // do something
  // react to the error
 });
 ```
@@ -7,7 +7,7 @@ triggering events, and callbacks.
 ```js
 const bus = new owl.core.EventBus();
-bus.on("some-event", null, function (...args) {
+bus.on("some-event", null, function(...args) {
  console.log(...args);
 });
@@ -23,3 +23,5 @@ Its API is:
 | `off(eventType, owner)`          | remove all listeners for an owner |
 | `trigger(eventType, ...args)`    | trigger an event                  |
 | `clear`                          | remove all subscriptions          |
 Note that the [`Store`](store.md) is an example of an `EventBus`.
@@ -1,151 +0,0 @@
 # 🦉 Event Handling 🦉
 ## Content
 - [Event Handling](#event-handling)
 - [Business DOM Events](#business-dom-events)
 - [Inline Event Handlers](#inline-event-handlers)
 - [Modifiers](#modifiers)
 ## Event Handling
 In a component's template, it is useful to be able to register handlers on DOM
 elements to some specific events. This is what makes a template _alive_. There
 are four different use cases.
 1. Register an event handler on a DOM node (_pure_ DOM event)
 2. Register an event handler on a component (_pure_ DOM event)
 3. Register an event handler on a DOM node (_business_ DOM event)
 4. Register an event handler on a component (_business_ DOM event)
 A _pure_ DOM event is directly triggered by a user interaction (e.g. a `click`).
 ```xml
 <button t-on-click="someMethod">Do something</button>
 ```
 This will be roughly translated in javascript like this:
 ```js
 button.addEventListener("click", component.someMethod.bind(component));
 ```
 The suffix (`click` in this example) is simply the name of the actual DOM
 event.
 ## Business DOM Events
 A _business_ DOM event is triggered by a call to `trigger` on a component.
 ```xml
 <MyComponent t-on-menu-loaded="someMethod" />
 ```
 ```js
 class MyComponent {
     someWhere() {
         const payload = ...;
         this.trigger('menu-loaded', payload);
     }
 }
 ```
 The call to `trigger` generates an `OwlEvent`, a subclass of [_CustomEvent_](https://developer.mozilla.org/docs/Web/Guide/Events/Creating_and_triggering_events)
 with an additional attribute `originalComponent` (the component that triggered
 the event). The generated event is of type `menu-loaded` and dispatches it on
 the component's DOM element (`this.el`). The event bubbles and is cancelable.
 The parent component listening to event `menu-loaded` will receive the payload
 in its `someMethod` handler (in the `detail` property of the event), whenever
 the event is triggered.
 ```js
 class ParentComponent {
     someMethod(ev) {
         const payload = ev.detail;
         ...
     }
 }
 ```
 By convention, we use KebabCase for the name of _business_ events.
 The `t-on` directive allows to prebind its arguments. For example,
 ```xml
 <button t-on-click="someMethod(expr)">Do something</button>
 ```
 Here, `expr` is a valid Owl expression, so it could be `true` or some variable
 from the rendering context.
 ### Type Hinting
 Note that if you work with Typescript, the `trigger` method is generic on the type of the payload.
 You can then describe the type of the event, so you will see typing errors...
 ```typescript
 this.trigger<MyCustomPayload>("my-custom-event", payload);
 ```
 ```typescript
 myCustomEventHandler(ev: OwlEvent<MyCustomPayload>) { ... }
 ```
 ## Inline Event Handlers
 One can also directly specify inline statements. For example,
 ```xml
 <button t-on-click="state.counter++">Increment counter</button>
 ```
 Here, `state` must be defined in the rendering context (typically the component)
 as it will be translated to:
 ```js
 button.addEventListener("click", () => {
  context.state.counter++;
 });
 ```
 Warning: inline expressions are evaluated in the context of the template. This
 means that they can access the component methods and properties. But if they set
 a key, the inline statement will actually not modify the component, but a key in
 a sub scope.
 ```xml
 <button t-on-click="value = 1">Set value to 1 (does not work!!!)</button>
 <button t-on-click="state.value = 1">Set state.value to 1 (work as expected)</button>
 ```
 ## Modifiers
 In order to remove the DOM event details from the event handlers (like calls to
 `event.preventDefault`) and let them focus on data logic, _modifiers_ can be
 specified as additional suffixes of the `t-on` directive.
 | Modifier   | Description                                                                                                              |
 | ---------- | ------------------------------------------------------------------------------------------------------------------------ |
 | `.stop`    | calls `event.stopPropagation()` before calling the method                                                                |
 | `.prevent` | calls `event.preventDefault()` before calling the method                                                                 |
 | `.self`    | calls the method only if the `event.target` is the element itself                                                        |
 | `.capture` | bind the event handler in [capture](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener) mode. |
 ```xml
 <button t-on-click.stop="someMethod">Do something</button>
 ```
 Note that modifiers can be combined (ex: `t-on-click.stop.prevent`), and that
 the order may matter. For instance `t-on-click.prevent.self` will prevent all
 clicks while `t-on-click.self.prevent` will only prevent clicks on the element
 itself.
 Finally, empty handlers are tolerated as they could be defined only to apply
 modifiers. For example,
 ```xml
 <button t-on-click.stop="">Do something</button>
 ```
 This will simply stop the propagation of the event.
@@ -17,9 +17,9 @@
  - [`useContext`](#usecontext)
  - [`useRef`](#useref)
  - [`useSubEnv`](#usesubenv)
-  - [`useExternalListener`](#useexternallistener)
+  - [`useStore`](#usestore)
-  - [`useComponent`](#usecomponent)
+  - [`useDispatch`](#usedispatch)
-  - [`useEnv`](#useenv)
+  - [`useGetters`](#usegetters)
  - [Making customized hooks](#making-customized-hooks)
 ## Overview
@@ -128,7 +128,7 @@ class SomeComponent extends Component {
 ### One rule
 There is only one rule: every hook for a component has to be called in the
-constructor, in the _setup_ method, or in class fields:
+constructor (or in class fields):
 ```js
 // ok
@@ -144,13 +144,6 @@ class SomeComponent extends Component {
  }
 }
 // also ok
 class SomeComponent extends Component {
  setup() {
    this.state = useState({ value: 0 });
  }
 }
 // not ok: this is executed after the constructor is called
 class SomeComponent extends Component {
  async willStart() {
@@ -265,7 +258,7 @@ function useLoader() {
  }
  onWillStart(() => updateRecord(component.props.id));
-  onWillUpdateProps((nextProps) => updateRecord(nextProps.id));
+  onWillUpdateProps(nextProps => updateRecord(nextProps.id));
  return record;
 }
@@ -361,26 +354,20 @@ will be added to the parent environment. Note that it will extend, not replace
 the parent environment. And of course, the parent environment will not be
 affected.
-### `useExternalListener`
+### `useStore`
-The `useExternalListener` hook helps solve a very common problem: adding and removing
+The `useStore` hook is the entry point for a component to connect to the store.
-a listener on some target whenever a component is mounted/unmounted. For example,
+See the [store documentation](store.md) for more information.
 a dropdown menu (or its parent) may need to listen to a `click` event on `window`
 to be closed:
-```js
+### `useDispatch`
 useExternalListener(window, "click", this.closeMenu);
 ```
-### `useComponent`
+The `useDispatch` hook is the way for components to get a reference to the store
 `dispatch` function. See the [store documentation](store.md) for more information.
-The `useComponent` hook is useful as a building block for some customized hooks,
+### `useGetters`
 that may need a reference to the component calling them.
-### `useEnv`
+The `useGetters` hook is the way for components to get a reference to the store
-
+getters. See the [store documentation](store.md) for more information.
 The `useEnv` hook is useful as a building block for some customized hooks,
 that may need a reference to the env of the component calling them.
 ### Making customized hooks
@@ -436,11 +423,13 @@ not the solution to every problem.
  ```js
  function useRouter() {
-    const env = useEnv();
+    return Component.current.env.router;
    return env.router;
  }
  ```
  This means that we give control to the application developer to create the
  router, which is good, so they can set it up, subclass it, ... And then, to
  test our components, we can just add a mock router in the environment.
 Note: the code above makes use of the `Component.current` property. This is the
 way hooks are able to get a reference to the component currently being created.
@@ -1,115 +1,5 @@
 # 🦉 Miscellaneous 🦉
 ## Content
 - [Portal](#portal)
 - [AsyncRoot](#asyncroot)
 ## `Portal`
 ### Overview
 The component `Portal` is meant to be used as a transparent way to 'teleport' a piece
 of DOM to the node represented by its sole `target` props.
 This component aims at helping the implementation of the needed infrastructure
 for modals (as in `bootstrap-modal`).
 ### Usage
 The content it will teleport is defined within the `<Portal>` node and
 internally uses the `default` [Slot](slots.md).
 This slot must contain only **one** node, which in turn can have as many children as necessary.
 The element under which the content will be teleported is represented as a selector
 by the `target` props which only accepts a string as value.
 The `target` props only supports static selector, and is not meant to be passed to `Portal`
 as a variable. Namely, `<Portal target="'body'" />` is the intended use.
 By contrast, `<Portal target="state.target" />` is not supported.
 The component `Portal` has no particular state, rather it is meant to be a slave to its parent,
 and ultimately just a way for the parent to teleport a piece of its own DOM elsewhere.
 The `Portal`'s root node is always `<portal/>` and is placed where the teleported content
 _would have_ been. It is this element that the [teleported events](#expected-behaviors) are re-directed on.
 ### Example
 The canonic use-case is to implement a Dialog, where a Component may choose to break the natural
 workflow to help the user put in some data, which it could use later on.
 JavaScript:
 ```js
 const { Component, mount } = owl;
 const { Portal } = owl.misc;
 class TeleportedComponent extends Component {}
 class App extends Component {
  static components = { Portal, TeleportedComponent };
 }
 mount(App, { target: document.body });
 ```
 XML:
 ```xml
 <templates>
    <div t-name="TeleportedComponent">
        <span>I will move soon enough</span>
    </div>
    <div t-name="App">
        <span>I am like the rest of us</span>
        <Portal target="'body'">
            <TeleportedComponent />
        </Portal>
    </div>
 </templates>
 ```
 In this example, the `Portal` component will teleport the `TeleportedComponent`'s `div` as a child of the `body`.
 `TeleportedComponent` is acting as a Dialog here.
 The resulting DOM will look like:
 ```xml
 <body>
    <div>
        <span>I am like the rest of us</span>
        <portal></portal>
    </div>
    <div>
        <span>I will move soon enough</span>
    </div>
 </body>
 ```
 ### Expected Behaviors
 The teleported piece is updated as any other `Component`'s DOM and in the same sequence.
 Namely the teleported piece will be updated in function of its parents components, and patched as
 a normal child.
 The [_business_ events](event_handling.md#business-dom-events) triggered by a child component will be stopped
 to not bubble outside of the `target`. They will, on the other hand, be re-directed onto the
 `Portal`'s root node and bubble up the DOM as if it were triggered by a regular child component.
 Beware that those re-directed events are copies of the original event.
 They have:
 - The same payload.
 - The same `originalComponent` than their original counterpart,
  that is the actual Component that triggered it.
 - A **different** `target` property than their original counterpart.
  The `target` of a re-directed event is necessarily the `Portal`'s root node.
 Pure DOM events do not follow this pattern and are free to bubble their natural, unaltered way
 up to the `body`.
 ## `AsyncRoot`
 When this component is used, a new rendering sub tree is created, such that the
@@ -1,60 +0,0 @@
 # 🦉 Mounting an application 🦉
 ## Content
 - [Overview](#overview)
 - [API](#api)
 ## Overview
 Mounting an Owl application is done by using the `mount` method (available in
 `owl.mount` if you are using the iife build, or it can be directly imported
 from `owl` if you are using a module system):
 ```js
 const mount = { owl }; // if owl is available as an object
 const env = { ... };
 const app = await mount(MyComponent, { target: document.body, env });
 ```
 Another example:
 ```js
 const config = {
  env: ...,
  props: ...,
  target: document.body,
  position: "self",
 };
 const app = await mount(App, config);
 ```
 A common way to initialize an application is to first setup an environment,
 then to call the `mount` method.
 ## API
 Mount takes two parameters:
 - `C`, which should be a component class (NOT instance),
 - `params`, which is an object with the following keys:
  - `target (HTMLElement | DocumentFragment)`: the target of the mount operation
  - `env (optional, Env)` an environment
  - `position (optional, "first-child" | "last-child" | "self")` the position
    where it should be mounted (see below for more informations)
  - `props (optional, any)`: some initial values that are given as props. Useful
    when the root component is configurable, or when testing sub components
 Here are the various positions supported by Owl:
 - `first-child`: with this option, the component will be prepended inside the target,
 - `last-child` (default value): with this option, the component will be
  appended in the target element,
 - `self`: the target will be used as the root element for the component. This
  means that the target has to be an HTMLElement (and not a document fragment).
  In this situation, it is possible that the component cannot be unmounted. For
  example, if its target is `document.body`.
 The `mount` method returns a promise that resolves to the instance of the created
 component.
@@ -15,7 +15,7 @@ use cases, there is no need to directly instantiate an observer.
 For example, this code will display `update` in the console:
 ```javascript
-const observer = new owl.core.Observer();
+const observer = new owl.Observer();
 observer.notifyCB = () => console.log("update");
 const obj = observer.observe({ a: { b: 1 } });
@@ -39,14 +39,14 @@ is incremented every time the value is observed. Sometimes, it can be useful
 to obtain that number:
 ```js
-const observer = new owl.core.Observer();
+const observer = new owl.Observer();
 const obj = observer.observe({ a: { b: 1 } });
-observer.revNumber(obj.a); // 1
+observer.deepRevNumber(obj.a); // 1
 obj.a.b = 2;
-observer.revNumber(obj.a); // 2
+observer.deepRevNumber(obj.a); // 2
 ```
-The `revNumber` can also return 0, which indicates that the value is not
+The `deepRevNumber` can also return 0, which indicates that the value is not
 observed.
@@ -18,7 +18,7 @@ class Child extends Component {
 }
 class Parent extends Component {
-  static template = xml`<div><Child a="state.a" b="'string'"/></div>`;
+  static template = xml`<div><ComponentA a="state.a" b="'string'"/></div>`;
  static components = { Child };
  state = useState({ a: "fromparent" });
 }
@@ -30,7 +30,7 @@ class ComponentB extends owl.Component {
    count: {type: Number},
    messages: {
      type: Array,
-      element: {type: Object, shape: {id: Boolean, text: String }
+      element: {type: Object, shape: {id: Boolean, text: 'string' }
    },
   date: Date,
   combinedVal: [Number, Boolean]
@@ -61,7 +61,7 @@ Its API is quite simple:
  ```
 - **`render(name, context, extra)`**: renders a template. This returns a `vnode`,
-  which is a virtual representation of the DOM (see [vdom doc](../miscellaneous/vdom.md)).
+  which is a virtual representation of the DOM (see [vdom doc](../architecture/vdom.md)).
  ```js
  const vnode = qweb.render("App", component);
@@ -105,8 +105,6 @@ between Owl classes. This is the reason why `QWeb` actually extends [EventBus](e
 ### Translations
 take care of this and "cherry-pick" 8464a1b04e7469434f9dcb3d68a543f58cb61b8e
 If properly setup, Owl QWeb engine can translate all rendered templates. To do
 so, it needs a translate function, which takes a string and returns a string.
@@ -116,9 +114,9 @@ For example:
 const translations = {
  hello: "bonjour",
  yes: "oui",
-  no: "non",
+  no: "non"
 };
-const translateFn = (str) => translations[str] || str;
+const translateFn = str => translations[str] || str;
 const qweb = new QWeb({ translateFn });
 ```
@@ -13,11 +13,8 @@
  - [Setting Variables](#setting-variables)
  - [Conditionals](#conditionals)
  - [Dynamic Attributes](#dynamic-attributes)
  - [Dynamic Class Attribute](#dynamic-class-attribute)
  - [Dynamic Tag Names](#dynamic-tag-names)
  - [Loops](#loops)
  - [Rendering Sub Templates](#rendering-sub-templates)
  - [Dynamic Sub Templates](#dynamic-sub-templates)
  - [Translations](#translations)
  - [Debugging](#debugging)
@@ -31,7 +28,7 @@ generate a virtual dom representation of the HTML.
 ```xml
 <div>
    <span t-if="somecondition">Some string</span>
-    <ul t-else="">
+    <ul t-else="1">
        <li t-foreach="messages" t-as="message">
            <t t-esc="message"/>
        </li>
@@ -74,11 +71,10 @@ needs. Here is a list of all Owl specific directives:
 | `t-component`, `t-props` | [Defining a sub component](component.md#composition)                            |
 | `t-ref`                  | [Setting a reference to a dom node or a sub component](component.md#references) |
 | `t-key`                  | [Defining a key (to help virtual dom reconciliation)](#loops)                   |
-| `t-on-*`                 | [Event handling](event_handling.md)                                             |
+| `t-on-*`                 | [Event handling](component.md#event-handling)                                   |
 | `t-transition`           | [Defining an animation](animations.md#css-transitions)                          |
-| `t-slot`                 | [Rendering a slot](slots.md)                                                    |
+| `t-slot`                 | [Rendering a slot](component.md#slots)                                          |
 | `t-model`                | [Form input bindings](component.md#form-input-bindings)                         |
 | `t-tag`                  | [Rendering nodes with dynamic tag name](#dynamic-tag-names)                     |
 ## Reference
@@ -105,7 +101,7 @@ precisely, the result of a template rendering should have a single root node:
 <!–– ok: result has one single root node ––>
 <t>
    <div t-if="someCondition">foo</div>
-    <span t-else="">bar</span>
+    <span t-else="1">bar</span>
 </t>
 ```
@@ -327,40 +323,6 @@ values) or a pair `[key, value]`. For example:
 <div t-att="['a', 'b']"/> <!-- <div a="b"></div> -->
 ```
 ### Dynamic class attribute
 For convenience, Owl supports a special case for the `t-att-class` case: one can
 use an object with keys describing the classes, and values boolean value denoting
 if the class is or is not present:
 ```xml
 <div t-att-class="{'a': true, 'b': true}"/> <!-- result: <div class="a b"></div> -->
 <div t-att-class="{'a b': true, 'c': true}"/> <!-- result: <div class="a b c"></div> -->
 ```
 Note that it can be combined with normal class attribute:
 ```xml
 <div class="a" t-att-class="{'b': true}"/> <!-- result: <div class="a b"></div> -->
 ```
 ### Dynamic tag names
 When writing generic components or templates, the specific concrete tag for an
 HTML element is not known yet. In those situations, the `t-tag` directive is
 useful. It simply evaluates dynamically an expression to use as a tag name. The
 template:
 ```xml
 <t t-tag="tag">
    <span>content</span>
 </t>
 ```
 will be rendered as `<div><span>content</span></div>` if the `tag` context key
 is set to `div`.
 ### Loops
 QWeb has an iteration directive `t-foreach` which take an expression returning the
@@ -490,17 +452,6 @@ are all equivalent:
 If there is no `t-key` directive, Owl will use the index as a default key.
 Note: the `t-foreach` directive only accepts arrays (lists) or objects. It does
 not work with other iterables, such as `Set`. However, it is only a matter of
 using the `...` javascript operator. For example:
 ```xml
 <t t-foreach="...items" t-as="item">...</t>
 ```
 The `...` operator will convert the `Set` (or any other iterables) into a list,
 which will work with Owl QWeb.
 ### Rendering Sub Templates
 QWeb templates can be used for top level rendering, but they can also be used
@@ -549,31 +500,6 @@ will result in :
 </div>
 ```
 This can be used to define variables scoped to a sub template:
 ```xml
 <t t-call="other-template">
    <t t-set="var" t-value="1"/>
 </t>
 <!-- "var" does not exist here -->
 ```
 ### Dynamic sub templates
 The `t-call` directive can also be used to dynamically call a sub template,
 using string interpolation. For example:
 ```xml
 <div t-name="main-template">
    <t t-call="{{template}}">
        <em>content</em>
    </t>
 </div>
 ```
 Here, the name of the template is obtained from the `template` value in the
 template rendering context.
 ### Translations
 By default, QWeb specify that templates should be translated. If this behaviour
@@ -597,7 +523,7 @@ The javascript QWeb implementation provides two useful debugging directives:
 ```xml
 <t t-if="a_test">
-    <t t-debug=""/>
+    <t t-debug="">
 </t>
 ```
@@ -0,0 +1,181 @@
 # 🦉 Router 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
  - [Route Definition](#route-definition)
  - [Router](#router)
  - [Navigation Guards](#navigation-guards)
  - [RouteComponent](#routecomponent)
  - [Link](#link)
 ## Overview
 It is often useful to organize an application around urls. If the application is
 a single page application, then we need a way to manage those urls in the browser.
 This is why there are many different routers for different frameworks. A generic
 router can do the job just fine, but a specialized router for Owl can give a
 better developer experience.
 The Owl router support the following features:
 - `history` or `hash` mode
 - declarative routes
 - route redirection
 - navigation guards
 - parameterized routes
 - a `<Link/>` component
 - a `<RouteComponent/>` component
 Note that it is still in early stage of developments, and there are probably
 still some issues.
 ## Example
 To use the Owl router, there are some steps that needs to be done:
 - declare some routes
 - create a router
 - add it to the environment
 ```js
 async function protectRoute({ env, to }) {
  if (!env.session.authUser) {
    env.session.setNextRoute(to.name);
    return { to: "SIGN_IN" };
  }
  return true;
 }
 export const ROUTES = [
  { name: "LANDING", path: "/", component: Landing },
  { name: "TASK", path: "/tasks/{{id}}", component: Task },
  { name: "SIGN_UP", path: "/signup", component: SignUp },
  { name: "SIGN_IN", path: "/signin", component: SignIn },
  { name: "ADMIN", path: "/admin", component: Admin, beforeRouteEnter: protectRoute },
  { name: "ACCOUNT", path: "/account", component: Account, beforeRouteEnter: protectRoute },
  { name: "UNKNOWN", path: "*", redirect: { to: "LANDING" } }
 ];
 function makeEnvironment() {
    ...
    const env = { qweb };
    env.session = new Session(env);
    env.router = new owl.router.Router(env, ROUTES);
    await env.router.start();
    return env;
 }
 App.env = makeEnvironment();
 // create root component here
 ```
 Notice that the router needs to be started. This is an asynchronous operation
 because it needs to apply the potential navigation guards on the current route
 (which may or may not mean that the application is redirected to another route).
 ## Reference
 ### Route definition
 A route need to be defined as an object with the following keys:
 - `name` (optional): a (unique) string useful to identify the current route. If not
  given, it will be assigned an automatic name,
 - `path`: a string describing the url. It can be static: `/admin` or dynamic: `/users/{{id}}`.
  It also can be `*`, to catch all remaining routes.
 - `component` (optional): an Owl component that will be used by the `t-routecomponent`
  directive if the route is active
 - `redirect` (optional): should be destination object (with optional keys `path`, `to` and `params`) if given, the application will be redirected to the destination whenever we match this route
 - `beforeRouteEnter`: defines a [navigation guard](#navigation-guards).
 ### `Router`
 The `Router` constructor takes three arguments:
 - `env`: a valid environment,
 - a list of routes,
 - an optional object (with the only key `mode` which can be `history` (default
  value) or `hash`).
 `history` will use the browser [History API](https://developer.mozilla.org/en-US/docs/Web/API/History_API) as the mechanism to manage URL.\
 Example: `https://yourdomain.tld/my_custom_route`.\
 For this mechanism to work, you need a way to configure your web server accordingly.
 `hash` will manipulate the hash of the URL.\
 Example: `https://yourdomain.tld/index.html#/my_custom_route`.
 ```js
 const ROUTES = [...];
 const router = new owl.router.Router(env, ROUTES, {mode: 'history'});
 ```
 Note that the route are defined in a list, and the order matters: the router
 tries to find a match by going down the list.
 The router needs to be added to the environment in the `router` sub key.
 Once a router is created, it needs to be started. This is necessary to initialize
 its current state to the current URL (and also, to potentially apply any
 navigation guards and/or redirecting).
 ```js
 await router.start();
 ```
 Once started, the router will keep track of the current url and reflect its
 value in two keys:
 - `router.currentRoute`
 - `router.currentParams`
 The router also has a `navigate` method, useful to programmatically change the
 application to another state (and the url):
 ```js
 router.navigate({ to: "USER", params: { id: 51 } });
 ```
 ### Navigation Guards
 Navigation guards are very useful to be able to execute some business logic/
 perform some actions or redirect to other routes whenever the application is
 entering a new route. For example, the following guard checks if there is an
 authenticated user, and if it is not the case, redirect to the sign in route.
 ```js
 async function protectRoute({ env, to }) {
  if (!env.session.authUser) {
    env.session.setNextRoute(to.name);
    return { to: "SIGN_IN" };
  }
  return true;
 }
 ```
 A navigation guard is a function that returns a promise, which either resolves
 to `true` (the navigation is accepted), or to another destination object.
 ### `RouteComponent`
 The `RouteComponent` component directs Owl to render the component associated
 to the currently active route (if any):
 ```xml
 <div t-name="App">
    <NavBar />
    <RouteComponent />
 </div>
 ```
 ### `Link`
 The `Link` component is a Owl component which render as a `<a>` tag with any
 content. It will compute the proper href from its props, and allow Owl to
 properly navigate to a given url if clicked on it.
 ```xml
 <Link to="'HOME'">Home</Link>
 ```
@@ -1,111 +0,0 @@
 # 🦉 Slots 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
 ## Overview
 Owl is a template based component system. There is therefore a need to be able
 to make generic components. For example, imagine a generic `Dialog`
 component, which is able to display some arbitrary content.
 Obviously, we want to use this component everywhere in our application, to
 display various different content. The `Dialog` component is technically the
 owner of its content, but is only a container. The user of the `Dialog` is
 the component that want to _inject_ something inside the `Dialog`. This is
 exactly what slots are for.
 ## Example
 To make generic components, it is useful to be able for a parent component to _inject_
 some sub template, but still be the owner. For example, a generic dialog component
 will need to render some content, some footer, but with the parent as the
 rendering context.
 Slots are inserted with the `t-slot` directive:
 ```xml
 <div t-name="Dialog" class="modal">
  <div class="modal-title"><t t-esc="props.title"/></div>
  <div class="modal-content">
    <t t-slot="content"/>
  </div>
  <div class="modal-footer">
    <t t-slot="footer"/>
  </div>
 </div>
 ```
 Slots are defined by the caller, with the `t-set-slot` directive:
 ```xml
 <div t-name="SomeComponent">
  <div>some component</div>
  <Dialog title="'Some Dialog'">
    <t t-set-slot="content">
      <div>hey</div>
    </t>
    <t t-set-slot="footer">
      <button t-on-click="doSomething">ok</button>
    </t>
  </Dialog>
 </div>
 ```
 In this example, the component `Dialog` will render the slots `content` and `footer`
 with its parent as rendering context. This means that clicking on the button
 will execute the `doSomething` method on the parent, not on the dialog.
 Note: Owl previously used the `t-set` directive to define the content of a slot.
 This is deprecated and should no longer be used in new code.
 ## Reference
 ### Default Slot
 The first element inside the component which is not a named slot will
 be considered the `default` slot. For example:
 ```xml
 <div t-name="Parent">
  <Child>
    <span>some content</span>
  </Child>
 </div>
 <div t-name="Child">
  <t t-slot="default"/>
 </div>
 ```
 ### Default content
 Slots can define a default content, in case the parent did not define them:
 ```xml
 <div t-name="Parent">
  <Child/>
 </div>
 <span t-name="Child">
  <t t-slot="default">default content</t>
 </span>
 <!-- will be rendered as: <div><span>default content</span></div> -->
 ```
 Rendering context: the content of the slots is actually rendered with the
 rendering context corresponding to where it was defined, not where it is
 positioned. This allows the user to define event handlers that will be bound
 to the correct component (usually, the grandparent of the slot content).
 ### Dynamic Slots
 The `t-slot` directive is actually able to use any expressions, using string
 interplolation:
 ```xml
 <t t-slot="{{current}}" />
 ```
@@ -0,0 +1,337 @@
 # 🦉 Store 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
  - [Store](#store)
  - [Actions](#actions)
  - [Getters](#getters)
  - [Connecting a Component](#connecting-a-component)
  - [`useStore`](#usestore)
  - [`useDispatch`](#usedispatch)
  - [`useGetters`](#usegetters)
  - [Semantics](#semantics)
  - [Good Practices](#good-practices)
 ## Overview
 Managing the state in an application is not an easy task. In some cases, the
 state of an application can be part of the component tree, in a natural way.
 However, there are situations where some parts of the state need to be displayed
 in various parts of the user interface, and then, it is not obvious which
 component should own which part of the state.
 Owl's solution to this issue is a centralized store. It is a class that owns
 some (or all) state, and lets the developer update it in a structured way, with
 `actions`. Owl components can then connect to the store, and will be updated if
 necessary.
 Note: Owl store is inspired by React Redux and VueX.
 ## Example
 Here is what a simple store looks like:
 ```js
 const actions = {
  addTodo({ state }, message) {
    state.todos.push({
      id: state.nextId++,
      message,
      isCompleted: false
    });
  }
 };
 const state = {
  todos: [],
  nextId: 1
 };
 const store = new owl.Store({ state, actions });
 store.on("update", null, () => console.log(store.state));
 // updating the state
 store.dispatch("addTodo", "fix all bugs");
 ```
 This example shows how a store can be defined and used. Note that in most cases,
 actions will be dispatched by connected components.
 ## Reference
 ### `Store`
 The store is a simple [`owl.EventBus`](event_bus.md) that triggers `update` events
 whenever its state is changed. Note that these events are triggered only after a
 microtask tick, so only one event will be triggered for any number of state changes in a
 call stack.
 Also, it is important to mention that the state is observed (with an `owl.Observer`),
 which is the reason why it is able to know if it was changed. See the
 [Observer](observer.md)'s documentation for more details.
 The `Store` class is quite small. It has two public methods:
 - its constructor
 - `dispatch`
 The constructor takes a configuration object with four (optional) keys:
 - the initial state
 - the actions
 - the getters
 - the environment
 ```javascript
 const config = {
  state,
  actions,
  getters,
  env
 };
 const store = new Store(config);
 ```
 ### Actions
 Actions are used to coordinate state changes. It can be used for both synchronous
 and asynchronous logic.
 ```js
 const actions = {
  async login({ state }, info) {
    state.loginState = "pending";
    try {
      const loginInfo = await doSomeRPC("/login/", info);
      state.loginState = loginInfo;
    } catch (e) {
      state.loginState = "error";
    }
  }
 };
 ```
 The first argument to an action method is an object with four keys:
 - `state`: the current state of the store content,
 - `dispatch`: a function that can be used to dispatch other actions,
 - `getters`: an object containing all getters defined in the store,
 - `env`: the current environment. This is useful sometimes, in particular if
  an action needs to apply some side effects (such as performing an rpc), and
  the `rpc` method is located in the environment.
 Actions are called with the `dispatch` method on the store, and can receive an
 arbitrary number of arguments.
 ```js
 store.dispatch("login", someInfo);
 ```
 Note that anything returned by an action will also be returned by the `dispatch`
 call.
 Also, it is important to be aware that we need to be careful with asynchronous
 logic. Each state change will potentially trigger a rerendering, so we need to
 make sure that we do not have a partially corrupted state. Here is an example that
 is likely not a good idea:
 ```javascript
 const actions = {
  async fetchSomeData({ state }, recordId) {
    state.recordId = recordId;
    const data = await doSomeRPC("/read/", recordId);
    state.recordData = data;
  }
 };
 ```
 In the previous example, there is a period of time in which the state has a
 `recordId` which does not correspond to the `recordData`. It is more likely that
 we want an atomic update: updating the `recordId` at the same time as the `recordData`
 values:
 ```javascript
 const actions = {
  async fetchSomeData({ state }, recordId) {
    const data = await doSomeRPC("/read/", recordId);
    state.recordId = recordId;
    state.recordData = data;
  }
 };
 ```
 ### Getters
 Usually, data contained in the store will be stored in a normalized way. For
 example,
 ```js
 {
    posts: [{id: 11, authorId: 4, content: 'Greetings'}],
    authors: [{id: 4, name: 'John'}]
 }
 ```
 However, the user interface will probably need some denormalized data like
 ```js
 {id: 11, author: {id: 4, name: 'John'}, content: 'Greetings'}
 ```
 This is what `getters` are for: they give a centralized way to process and
 transform the data contained in the store.
 ```js
 const getters = {
  getPost({ state }, id) {
    const post = state.posts.find(p => p.id === id);
    const author = state.authors.find(a => a.id === post.id);
    return {
      id,
      author,
      content: post.content
    };
  }
 };
 // somewhere else
 const post = store.getters.getPost(id);
 ```
 Getters take _at most_ one argument.
 Note that getters are not cached.
 ### Connecting a Component
 At some point, we need a way to interact with the store from a component. This
 can be done with the help of the three store hooks:
 - [`useStore`](#usestore) to subscribe a component to some part of the store state,
 - [`useDispatch`](#usedispatch) to get a reference to a dispatch function,
 - [`useGetters`](#usegetters) to get a reference to the getters defined in the store.
 Assume we have this store:
 ```javascript
 const actions = {
  increment({ state }, val) {
    state.counter.value += val;
  }
 };
 const state = {
  counter: { value: 0 }
 };
 const store = new owl.Store({ state, actions });
 ```
 A counter component can then select this value and dispatch an action like this:
 ```js
 class Counter extends Component {
  counter = useStore(state => state.counter);
  dispatch = useDispatch();
 }
 const counter = new Counter({ store, qweb });
 ```
 ```xml
 <button t-name="Counter" t-on-click="dispatch('increment')">
  Click Me! [<t t-esc="counter.value"/>]
 </button>
 ```
 ### `useStore`
 The `useStore` hook is used to select some part of the store state. It accepts
 two arguments:
 - a selector function, which takes the store state as first argument (and the
  component props as second argument) and which must return the part of the
  store state that will be made available and observed for changes,
 - optionally, an object which can have the following optional keys:
  - a `store` key containing a store object if we want to use another store than
    the default store,
  - an `isEqual` key containing an equality function if we want to specialize
    the comparison (the function must accept two arguments: the previous result
    and the new result, and must return whether they are equal),
  - and an `onUpdate` key containing an update function if we want to execute an
    arbitrary code every time the selected state changes (the function will
    receive one argument, the new result, and can execute arbitrary code).
 If the `useStore` selector returns a sub part of the store state, the component
 will only be rerendered whenever this part of the state changes. Otherwise, it
 will perform a strict equality check (unless the `isEqual` option is defined,
 then it will call it) and will update the component every time this check fails.
 Note that if the selector function returns a primitive type, the result of
 `useStore` will be immutable and it will not react to changes. In this case, it
 is important to define the `onUpdate` option to properly update the value
 manually when it changes.
 Also, the return value from `useStore` is not supposed to be modified. The store
 state should only be updated with actions.
 ### `useDispatch`
 The `useDispatch` hook is useful when a component needs to be able to dispatch
 actions. It takes an optional argument, which is a store. If not given, it will
 use the store in the environment.
 Note that a component does not need to be connected in any other way to the store.
 For example:
 ```js
 class DoSomethingButton extends Component {
  static template = xml`<button t-on-click="dispatch('something')">Click</button>`;
  dispatch = useDispatch();
 }
 ```
 ### `useGetters`
 The `useGetters` hook is useful when a component needs to be able to use the
 getters defined in a store. It takes an optional argument, which is a store. If
 not given, it will use the store in the environment.
 Note that a component does not need to be connected in any other way to the store.
 For example:
 ```js
 class InfoButton extends Component {
  static template = xml`<span><t t-esc="getters.somevalue()"></span>`;
  getters = useGetters();
 }
 ```
 ### Semantics
 The `Store` class and the `useStore` hook try to be smart and to optimize as much
 as possible the rendering and update process. What is important to know is:
 - components are always updated in the order of their creation (so, parent
  before children),
 - they are updated only if they are in the DOM,
 - if a parent is asynchronous, the system will wait for it to complete its
  update before updating other components,
 - in general, updates are not coordinated. This is not a problem for synchronous
  components, but if there are many asynchronous components, this could lead to
  a situation where some part of the UI is updated and some other part of the UI is
  not updated.
 ### Good Practices
 - avoid asynchronous components as much as possible. Asynchronous components
  lead to situations where parts of the UI is not updated immediately,
 - do not be afraid to connect many components, parent or children if needed. For
  example, a `MessageList` component could get a list of ids in its `useStore`
  call and a `Message` component could get the data of its own
  message,
 - since the `useStore` function is called for each connected component,
  for each state update, it is important to make sure that these functions are
  as fast as possible.
@@ -4,19 +4,16 @@
 - [Overview](#overview)
 - [`xml` tag](#xml-tag)
 - [`css` tag](#css-tag)
 ## Overview
-Tags are very small helpers intended to make it easy to write inline templates
+Tags are very small helpers to make it easy to write inline templates. There is
-or styles. There are currently two tags: `css` and `xml`. With these functions,
+only one currently available tag: `xml`, but we plan to add other tags later,
-it is possible to write [single file components](../learning/how_to_write_sfc.md).
+such as a `css` tag, which will be used to write [single file components](../tooling.md#single-file-component).
 ## XML tag
-The `xml` tag is certainly the most useful tag. It is used to define an inline
+Without tags, creating a standalone component would look like this:
 QWeb template for a component. Without tags, creating a standalone component
 would look like this:
 ```js
 import { Component } from 'owl'
@@ -55,130 +52,3 @@ class MyComponent extends Component {
    ...
 }
 ```
 ## CSS tag
 The CSS tag is useful to define a css stylesheet in the javascript file:
 ```js
 class MyComponent extends Component {
  static template = xml`
        <div class="my-component">some template</div>
    `;
  static style = css`
    .my-component {
      color: red;
    }
  `;
 }
 ```
 The `css` tag registers internally the css information. Then, whenever the first
 instance of the component is created, will add a `<style>` tag to the document
 `<head>`.
 Note that to make it more useful, like other css preprocessors, the `css` tag
 accepts a small extension of the css specification: css scopes can be nested,
 and the rules will then be expanded by the `css` helper:
 ```scss
 .my-component {
  display: block;
  .sub-component h {
    color: red;
  }
 }
 ```
 will be formatted as:
 ```css
 .my-component {
  display: block;
 }
 .my-component .sub-component h {
  color: red;
 }
 ```
 This extension brings another useful feature: the `&` selector which refers to
 the parent selector. For example, we want our component to be red when hovered.
 We would like to write something like:
 ```scss
 .my-component {
  display: block;
  :hover {
    color: red;
  }
 }
 ```
 but it will be formatted as:
 ```css
 .my-component {
  display: block;
 }
 .my-component :hover {
  color: red;
 }
 ```
 The `&` selector can be used to solve this problem:
 ```scss
 .my-component {
  display: block;
  &:hover {
    color: red;
  }
 }
 ```
 will be formatted as:
 ```css
 .my-component {
  display: block;
 }
 .my-component:hover {
  color: red;
 }
 ```
 Now, there is no additional processing done by the `css` tag. However, since it
 is done in javascript at runtime, we actually have more power. For example:
 1. sharing values between javascript and css:
 ```js
 import { theme } from "./theme";
 class MyComponent extends Component {
  static template = xml`<div class="my-component">...</div>`;
  static style = css`
    .my-component {
      color: ${theme.MAIN_COLOR};
      background-color: ${theme.SECONDARY_color};
    }
  `;
 }
 ```
 2. scoping rules to the current component:
 ```js
 import { generateUUID } from "./utils";
 const uuid = generateUUID();
 class MyComponent extends Component {
  static template = xml`<div data-o-${uuid}="">...</div>`;
  static style = css`
    [data-o-${uuid}] {
      color: red;
    }
  `;
 }
 ```
@@ -19,20 +19,20 @@ not ready yet, resolved directly otherwise). If called with a callback as
 argument, it executes it as soon as the DOM ready (or directly).
 ```js
-Promise.all([loadFile("templates.xml"), owl.utils.whenReady()]).then(function ([templates]) {
+Promise.all([loadFile("templates.xml"), owl.utils.whenReady()]).then(function([templates]) {
  const qweb = new owl.QWeb({ templates });
-  const env = { qweb };
+  const app = new App({ qweb });
-  await mount(App, { env, target: document.body });
+  app.mount(document.body);
 });
 ```
 or alternatively:
 ```js
-owl.utils.whenReady(function () {
+owl.utils.whenReady(function() {
  const qweb = new owl.QWeb();
-  const env = { qweb };
+  const app = new App({ qweb });
-  await mount(App, { env, target: document.body });
+  app.mount(document.body);
 });
 ```
@@ -0,0 +1,107 @@
 # 🦉 Tooling 🦉
 ## Content
 - [Overview](#overview)
 - [Playground](#playground)
 - [Benchmarks](#benchmarks)
 - [Single File Component](#single-file-component)
 - [Debugging Script](#debugging-script)
 ## Overview
 To help work with/improve/learn OWL, there are a few extras tools/settings.
 - development mode: enable better error reporting for the developer
 - a playground application: a space to experiment and learn Owl.
 - a benchmarks application: allow comparison with a few common frameworks
 The two applications are available in the `tools/` folder, and can be accessed
 by using a static http server. A simple python
 server is available in `server.py`. There is also a npm script to start it:
 `npm run tools` (and its version with a watcher: `npm run tools:watch`).
 ## Playground
 The playground is an important application designed to help learning and
 experimenting with Owl. The last published version of Owl can be tested [online](https://odoo.github.io/owl/playground/).
 It is an application similar to `jsFiddle`, but specialized for Owl: there are
 three tabs (`js`, `css` and `xml`), and a simple button `Run` to execute that
 code in an iframe.
 ## Benchmarks
 Note: This is more an internal tool, useful for people working on Owl.
 The benchmarks application is a very small application, implemented in different
 frameworks, and in different versions of Owl. This is a simple internal tool,
 useful to compare various performance metrics on some tasks.
 ## Single File Component
 It is very useful to group code by feature instead of by type of file. It makes
 it easier to scale application to larger size.
 To do so, Owl currently has a small helper that makes it easy to define a
 template inside a javascript (or typescript) file: the [`xml`](reference/tags.md#xml-tag)
 helper. With this, a template is automatically registered to [QWeb](reference/qweb_engine.md).
 This means that the template and the javascript code can be defined in the same
 file. It is not currently possible to add css to the same file, but Owl may
 get a `css` tag helper later.
 ```js
 const { Component } = owl;
 const { xml } = owl.tags;
 // -----------------------------------------------------------------------------
 // TEMPLATE
 // -----------------------------------------------------------------------------
 const TEMPLATE = xml/* xml */ `
 	<div class="main two-columns">
 		<Sidebar/>
 		<Content />
 	</div>`;
 // -----------------------------------------------------------------------------
 // CODE
 // -----------------------------------------------------------------------------
 class MyComponent extends Component {
  static template = TEMPLATE;
  static components = { Sidebar, Content };
  // rest of component...
 }
 ```
 Note that the above example has an inline xml comment, just after the `xml` call.
 This is useful for some editor plugins, such as the VS Code addon
 `Comment tagged template`, which, if installed, add syntax highlighting to the
 content of the template string.
 ## Debugging Script
 ## Debugging
 Non trivial applications become quickly more difficult to understand. It is then
 useful to have a solid understanding of what is going on. To help with that,
 logging useful information is extremely valuable. There is a [javascript file](../tools/debug.js) which can be evaluated in an application.
 Once it is executed, it will log a lot of information on each component main hooks. The following code is a minified version to make it easier to copy/paste:
 ```
 let debugSetup = {
  // componentBlackList: /App/,  // regexp
  // componentWhiteList: /SomeComponent/, // regexp
  // methodBlackList: ["mounted"], // list of method names
  // methodWhiteList: ["willStart"], // list of method names
  logScheduler: false,  // display/mute scheduler logs
  logStore: true,     // display/mute store logs
 };
 {let o,t="[OWL_DEBUG]";function toStr(o){let t=JSON.stringify(o||{});return t.length>200&&(t=t.slice(0,200)+"..."),t}function debugComponent(o,e,n){let l=`${e}<id=${n}>`,r=o=>(!debugSetup.methodBlackList||!debugSetup.methodBlackList.includes(o))&&!(debugSetup.methodWhiteList&&!debugSetup.methodWhiteList.includes(o));r("constructor")&&console.log(`${t} ${l} constructor, props=${toStr(o.props)}`),r("willStart")&&owl.hooks.onWillStart(()=>{console.log(`${t} ${l} willStart`)}),r("mounted")&&owl.hooks.onMounted(()=>{console.log(`${t} ${l} mounted`)}),r("willUpdateProps")&&owl.hooks.onWillUpdateProps(o=>{console.log(`${t} ${l} willUpdateProps, nextprops=${toStr(o)}`)}),r("willPatch")&&owl.hooks.onWillPatch(()=>{console.log(`${t} ${l} willPatch`)}),r("patched")&&owl.hooks.onPatched(()=>{console.log(`${t} ${l} patched`)}),r("willUnmount")&&owl.hooks.onWillUnmount(()=>{console.log(`${t} ${l} willUnmount`)});const s=o.__render.bind(o);o.__render=function(...o){console.log(`${t} ${l} rendering template`),s(...o)};const u=o.render.bind(o);o.render=function(...o){return console.log(`${t} ${l} render`),u(...o)};const c=o.mount.bind(o);o.mount=function(...o){return console.log(`${t} ${l} mount`),c(...o)}}if(Object.defineProperty(owl.Component,"current",{get:()=>o,set(t){o=t;const e=t.constructor.name;if(debugSetup.componentBlackList&&debugSetup.componentBlackList.test(e))return;if(debugSetup.componentWhiteList&&!debugSetup.componentWhiteList.test(e))return;let n;Object.defineProperty(o,"__owl__",{get:()=>n,set(o){debugComponent(t,e,(n=o).id)}})}}),debugSetup.logScheduler){let o;Object.defineProperty(owl.Component.scheduler,"isRunning",{get:()=>o,set(e){e?console.log(`${t} scheduler: start running tasks queue`):console.log(`${t} scheduler: stop running tasks queue`),o=e}})}if(debugSetup.logStore){let o=owl.Store.prototype.dispatch;owl.Store.prototype.dispatch=function(e,...n){return console.log(`${t} store: action '${e}' dispatched. Payload: '${toStr(n)}'`),o.call(this,e,...n)}}}
 ```
 Note that it is certainly useful to run this code at some point in an application,
 just to get a feel of what each user action implies, for the framework.
@@ -1,74 +1,58 @@
 {
-  "name": "@odoo/owl",
+  "name": "owl-framework",
-  "version": "2.0.0-alpha1",
+  "version": "1.0.0-alpha5",
  "description": "Odoo Web Library (OWL)",
-  "main": "dist/owl.cjs.js",
+  "main": "src/index.ts",
  "browser": "dist/owl.iife.js",
  "module": "dist/owl.es.js",
  "types": "dist/types/index.d.ts",
  "files": [
    "dist"
  ],
  "engines": {
-    "node": ">=12.18.3"
+    "node": ">=10.15.3"
  },
  "scripts": {
    "build:js": "tsc --target esnext --module es6 --outDir dist/owl",
    "build:bundle": "rollup -c",
-    "build": "npm run build:bundle",
+    "build": "npm run build:js && npm run build:bundle",
    "buildcommonjs": "npm run build:js && npm run build:bundle -- -f cjs",
    "minify": "uglifyjs dist/owl.js -o dist/owl.min.js --compress --mangle",
    "test": "jest",
    "test:debug": "node --inspect-brk node_modules/.bin/jest --runInBand --watch --testTimeout=5000000",
    "test:watch": "jest --watch",
-    "playground:serve": "python3 tools/server.py || python tools/server.py",
+    "tools:serve": "python3 tools/server.py || python tools/server.py",
-    "playground": "npm run build && npm run playground:serve",
+    "tools": "npm run build && npm run tools:serve",
-    "preplayground:watch": "npm run build",
+    "pretools:watch": "npm run build",
-    "playground:watch": "npm-run-all  --parallel playground:serve \"build:* -- --watch\"",
+    "tools:watch": "npm-run-all  --parallel tools:serve \"build:* -- --watch\"",
-    "prettier": "prettier {src/*.ts,src/**/*.ts,tests/*.ts,tests/**/*.ts,doc/*.md,doc/**/*.md} --write",
+    "prettier": "prettier {src/*.ts,src/**/*.ts,tests/*.ts,tests/**/*.ts,doc/*.md,doc/**/*.md} --write"
    "check-formatting": "prettier {src/*.ts,src/**/*.ts,tests/*.ts,tests/**/*.ts,doc/*.md,doc/**/*.md} --check",
    "publish": "npm run build && npm publish",
    "release": "node tools/release.js"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/odoo/owl.git"
  },
  "author": "Odoo",
-  "license": "LGPL-3.0-only",
+  "license": "LGPL",
  "bugs": {
    "url": "https://github.com/odoo/owl/issues"
  },
  "homepage": "https://github.com/odoo/owl#readme",
  "dependencies": {},
  "devDependencies": {
-    "@types/jest": "^27.0.1",
+    "@types/jest": "^23.3.12",
    "@types/node": "^14.11.8",
    "chalk": "^3.0.0",
    "cpx": "^1.5.0",
    "current-git-branch": "^1.1.0",
    "git-rev-sync": "^1.12.0",
-    "github-api": "^3.3.0",
+    "jest": "^23.6.0",
-    "jest": "^27.1.0",
+    "jest-environment-jsdom": "^24.7.1",
    "jest-diff": "^27.3.1",
    "jest-environment-jsdom": "^27.1.0",
    "live-server": "^1.2.1",
    "npm-run-all": "^4.1.5",
-    "prettier": "2.4.1",
+    "prettier": "^1.19.1",
-    "rollup": "^2.56.3",
+    "rollup": "^1.6.0",
-    "rollup-plugin-terser": "^7.0.2",
+    "rollup-plugin-typescript2": "^0.20.1",
    "rollup-plugin-typescript2": "^0.31.1",
    "sass": "^1.16.1",
    "source-map-support": "^0.5.10",
-    "ts-jest": "^27.0.5",
+    "ts-jest": "^23.10.5",
-    "typescript": "4.5.2",
+    "typescript": "^3.7.2",
    "uglify-es": "^3.3.9"
  },
  "jest": {
    "testEnvironment": "jsdom",
    "roots": [
      "<rootDir>/src",
      "<rootDir>/tests"
    ],
    "setupFiles": [
      "./tests/mocks/mockEventTarget.js"
    ],
    "transform": {
      "^.+\\.ts?$": "ts-jest"
    },
@@ -84,7 +68,6 @@
    ]
  },
  "prettier": {
-    "printWidth": 100,
+    "printWidth": 100
    "endOfLine": "auto"
  }
 }
@@ -1,27 +1,47 @@
 # 🦉 OWL Roadmap 🦉
- Current version: 1.4.7
+- Current version: 1.0.0-alpha5
- Status: stable
+- Status: mostly stable
 This roadmap is only an attempt at predicting Owl's future.  Everything may
 change!
 ### November 2019
 Owl will be used in various Odoo projects. We plan to:
 - fix any issues encountered
 - maybe cleanup slightly the router API
 - improve the documentation
 - improve error handling, add more helpful error messages
 ### December 2019
 If all goes well, Owl will be upgraded to beta status. From then, no API change,
 even small, is expected.
 ### End of 2019
 Release v1.0
 - API should be stable,
 - we will use semantic versioning,
 - we will maintain a changelog and an upgrade guide.
 ### 1.x
 - add chrome and firefox devtools,
 - add support for single file components,
 - fix every bugs,
 - improve documentation,
 - small backward compatible improvements.
-### 2.x (2020? 2021? 2022?)
+### 2.x (2021? 2022?)
 - stop support for `t-set` directive to define the content of a slot
 Maybe:
- reimplement vdom to use *block* system, like Vue 3, which should make Owl
+- reimplement vdom to use *block* system, like Vue 3,
  much faster
 - refactor `QWeb` to use an intermediate representation (some kind of AST) to
  allow additional optimisations.
@@ -1,71 +1,14 @@
-import pkg from "./package.json";
+import { version } from "./package.json";
 import git from "git-rev-sync";
 import typescript from 'rollup-plugin-typescript2';
 import { terser } from "rollup-plugin-terser";
 const name = "owl";
 const extend = true;
 /**
 * Meta data to be added on the __info__ object.
 * Used to let external tools know the current owl version.
 */
 const outro = `
 __info__.version = '${pkg.version}';
 __info__.date = '${new Date().toISOString()}';
 __info__.hash = '${git.short()}';
 __info__.url = 'https://github.com/odoo/owl';
 `;
 /**
 * Generate from a string depicting a path a new path for the minified version.
 * @param {string} pkgFileName file name
 */
 function generateMinifiedNameFromPkgName(pkgFileName) {
  const parts = pkgFileName.split('.');
  parts.splice(parts.length - 1, 0, "min");
  return parts.join('.');
 }
 /**
 * Get the rollup config based on the arguments
 * @param {string} format format of the bundle
 * @param {string} generatedFileName generated file name
 * @param {boolean} minified should it be minified
 */
 function getConfigForFormat(format, generatedFileName, minified = false) {
  return {
    file: minified ? generateMinifiedNameFromPkgName(generatedFileName) : generatedFileName,
    format: format,
    name: name,
    extend: extend,
    outro: outro,
    freeze: false,
    plugins: minified ? [terser()] : [],
    indent: '    ', // indent with 4 spaces
  };
 }
 // rollup.config.js
 export default {
-  input: "src/index.ts",
+  input: "dist/owl/index.js",
-  output: [
+  output: {
-
+    file: "dist/owl.js",
-    /**
+    format: "iife",
-     * Read about module formats:
+    name: "owl",
-     *  https://auth0.com/blog/javascript-module-systems-showdown/
+    extend: true,
-     *  https://medium.com/@kelin2025/so-you-wanna-use-es6-modules-714f48b3a953
+    outro: `exports.__info__.version = '${version}';\nexports.__info__.date = '${new Date().toISOString()}';\nexports.__info__.hash = '${git.short()}';\nexports.__info__.url = 'https://github.com/odoo/owl';`
-     */
+  }
    getConfigForFormat('esm', pkg.module),
    getConfigForFormat('esm', pkg.module, true),
    getConfigForFormat('cjs', pkg.main),
    getConfigForFormat('cjs', pkg.main, true),
    getConfigForFormat('iife', pkg.browser),
    getConfigForFormat('iife', pkg.browser, true),
  ],
  plugins: [
    typescript({
      useTsconfigDeclarationDir: true
    }),
  ]
 };
@@ -1,105 +0,0 @@
 import { Component } from "../component/component";
 import { ComponentNode } from "../component/component_node";
 import { MountOptions } from "../component/fibers";
 import { Scheduler } from "../component/scheduler";
 import { TemplateSet, TemplateSetConfig } from "./template_set";
 import { nodeErrorHandlers } from "../component/error_handling";
 // reimplement dev mode stuff see last change in 0f7a8289a6fb8387c3c1af41c6664b2a8448758f
 export interface Env {
  [key: string]: any;
 }
 export interface AppConfig extends TemplateSetConfig {
  env?: Env;
  props?: any;
 }
 export const DEV_MSG = `Owl is running in 'dev' mode.
 This is not suitable for production use.
 See https://github.com/odoo/owl/blob/master/doc/reference/config.md#mode for more information.`;
 export class App<T extends typeof Component = any> extends TemplateSet {
  Root: T;
  props: any;
  env: Env;
  scheduler = new Scheduler(window.requestAnimationFrame.bind(window));
  root: ComponentNode | null = null;
  constructor(Root: T, config: AppConfig = {}) {
    super(config);
    this.Root = Root;
    if (config.dev) {
      console.info(DEV_MSG);
    }
    const descrs = Object.getOwnPropertyDescriptors(config.env || {});
    this.env = Object.freeze(Object.defineProperties({}, descrs));
    this.props = config.props || {};
  }
  mount(target: HTMLElement, options?: MountOptions): Promise<InstanceType<T>> {
    this.checkTarget(target);
    const node = this.makeNode(this.Root, this.props);
    const prom = this.mountNode(node, target, options);
    this.root = node;
    return prom;
  }
  checkTarget(target: HTMLElement) {
    if (!(target instanceof HTMLElement)) {
      throw new Error("Cannot mount component: the target is not a valid DOM element");
    }
    if (!document.body.contains(target)) {
      throw new Error("Cannot mount a component on a detached dom node");
    }
  }
  makeNode(Component: T, props: any): ComponentNode {
    return new ComponentNode(Component, props, this);
  }
  mountNode(node: ComponentNode, target: HTMLElement, options?: MountOptions) {
    const promise: any = new Promise((resolve, reject) => {
      let isResolved = false;
      // manually set a onMounted callback.
      // that way, we are independant from the current node.
      node.mounted.push(() => {
        resolve(node.component);
        isResolved = true;
      });
      // Manually add the last resort error handler on the node
      let handlers = nodeErrorHandlers.get(node);
      if (!handlers) {
        handlers = [];
        nodeErrorHandlers.set(node, handlers);
      }
      handlers.unshift((e) => {
        if (isResolved) {
          console.error(e);
        } else {
          reject(e);
        }
        throw e;
      });
    });
    node.mountComponent(target, options);
    return promise;
  }
  destroy() {
    if (this.root) {
      this.root.destroy();
    }
  }
 }
 export async function mount<T extends typeof Component>(
  C: T,
  target: HTMLElement,
  config: AppConfig & MountOptions = {}
 ): Promise<InstanceType<T>> {
  return new App(C, config).mount(target, config);
 }
@@ -1,213 +0,0 @@
 import { BDom, multi, text, toggler } from "../blockdom";
 import { validateProps } from "../component/props_validation";
 import { Markup } from "../utils";
 import { html } from "../blockdom/index";
 import { VPortal } from "../portal";
 /**
 * This file contains utility functions that will be injected in each template,
 * to perform various useful tasks in the compiled code.
 */
 function withDefault(value: any, defaultValue: any): any {
  return value === undefined || value === null || value === false ? defaultValue : value;
 }
 function callPortal(
  ctx: any,
  parent: any,
  key: string,
  target: string,
  content: (ctx: any, node: any, key: string) => BDom
 ): BDom {
  const portal = new VPortal(target, content(ctx, parent, key), ctx.__owl__) as any;
  return portal;
 }
 function callSlot(
  ctx: any,
  parent: any,
  key: string,
  name: string,
  dynamic: boolean,
  extra: any,
  defaultContent?: (ctx: any, node: any, key: string) => BDom
 ): BDom {
  const slots = (ctx.props && ctx.props.slots) || {};
  const { __render, __ctx, __scope } = slots[name] || {};
  const slotScope = Object.create(__ctx || {});
  if (__scope) {
    slotScope[__scope] = extra || {};
  }
  const slotBDom = __render ? __render.call(__ctx.__owl__.component, slotScope, parent, key) : null;
  if (defaultContent) {
    let child1: BDom | undefined = undefined;
    let child2: BDom | undefined = undefined;
    if (slotBDom) {
      child1 = dynamic ? toggler(name, slotBDom) : slotBDom;
    } else {
      child2 = defaultContent.call(ctx.__owl__.component, ctx, parent, key);
    }
    return multi([child1, child2]);
  }
  return slotBDom || text("");
 }
 function capture(ctx: any): any {
  const component = ctx.__owl__.component;
  const result = Object.create(component);
  for (let k in ctx) {
    result[k] = ctx[k];
  }
  return result;
 }
 function withKey(elem: any, k: string) {
  elem.key = k;
  return elem;
 }
 function prepareList(collection: any): [any[], any[], number, any[]] {
  let keys: any[];
  let values: any[];
  if (Array.isArray(collection)) {
    keys = collection;
    values = collection;
  } else if (collection) {
    values = Object.keys(collection);
    keys = Object.values(collection);
  } else {
    throw new Error("Invalid loop expression");
  }
  const n = values.length;
  return [keys, values, n, new Array(n)];
 }
 const isBoundary = Symbol("isBoundary");
 function setContextValue(ctx: { [key: string]: any }, key: string, value: any): void {
  const ctx0 = ctx;
  while (!ctx.hasOwnProperty(key) && !ctx.hasOwnProperty(isBoundary)) {
    const newCtx = ctx.__proto__;
    if (!newCtx) {
      ctx = ctx0;
      break;
    }
    ctx = newCtx;
  }
  ctx[key] = value;
 }
 function toNumber(val: string): number | string {
  const n = parseFloat(val);
  return isNaN(n) ? val : n;
 }
 function shallowEqual(l1: any[], l2: any[]): boolean {
  for (let i = 0, l = l1.length; i < l; i++) {
    if (l1[i] !== l2[i]) {
      return false;
    }
  }
  return true;
 }
 class LazyValue {
  fn: any;
  ctx: any;
  node: any;
  constructor(fn: any, ctx: any, node: any) {
    this.fn = fn;
    this.ctx = capture(ctx);
    this.node = node;
  }
  evaluate(): any {
    return this.fn(this.ctx, this.node);
  }
  toString() {
    return this.evaluate().toString();
  }
 }
 /*
 * Safely outputs `value` as a block depending on the nature of `value`
 */
 export function safeOutput(value: any): ReturnType<typeof toggler> {
  if (!value) {
    return value;
  }
  let safeKey;
  let block;
  if (value instanceof Markup) {
    safeKey = `string_safe`;
    block = html(value as string);
  } else if (value instanceof LazyValue) {
    safeKey = `lazy_value`;
    block = value.evaluate();
  } else if (typeof value === "string") {
    safeKey = "string_unsafe";
    block = text(value);
  } else {
    // Assuming it is a block
    safeKey = "block_safe";
    block = value;
  }
  return toggler(safeKey, block);
 }
 let boundFunctions = new WeakMap();
 function bind(ctx: any, fn: Function): Function {
  let component = ctx.__owl__.component;
  let boundFnMap = boundFunctions.get(component);
  if (!boundFnMap) {
    boundFnMap = new WeakMap();
    boundFunctions.set(component, boundFnMap);
  }
  let boundFn = boundFnMap.get(fn);
  if (!boundFn) {
    boundFn = fn.bind(component);
    boundFnMap.set(fn, boundFn);
  }
  return boundFn;
 }
 type RefMap = { [key: string]: HTMLElement | null };
 type RefSetter = (el: HTMLElement | null) => void;
 function multiRefSetter(refs: RefMap, name: string): RefSetter {
  let count = 0;
  return (el) => {
    if (el) {
      count++;
      if (count > 1) {
        throw new Error("Cannot have 2 elements with same ref name at the same time");
      }
    }
    if (count === 0 || el) {
      refs[name] = el;
    }
  };
 }
 export const UTILS = {
  withDefault,
  zero: Symbol("zero"),
  isBoundary,
  callSlot,
  callPortal,
  capture,
  withKey,
  prepareList,
  setContextValue,
  multiRefSetter,
  shallowEqual,
  toNumber,
  validateProps,
  LazyValue,
  safeOutput,
  bind,
 };
@@ -1,126 +0,0 @@
 import { createBlock, html, list, multi, text, toggler, comment } from "../blockdom";
 import { compile, Template } from "../compiler";
 import { component } from "../component/component_node";
 import { UTILS } from "./template_helpers";
 const bdom = { text, createBlock, list, multi, html, toggler, component, comment };
 export const globalTemplates: { [key: string]: string | Node } = {};
 function parseXML(xml: string): Document {
  const parser = new DOMParser();
  const doc = parser.parseFromString(xml, "text/xml");
  if (doc.getElementsByTagName("parsererror").length) {
    let msg = "Invalid XML in template.";
    const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
    if (parsererrorText) {
      msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
      const re = /\d+/g;
      const firstMatch = re.exec(parsererrorText);
      if (firstMatch) {
        const lineNumber = Number(firstMatch[0]);
        const line = xml.split("\n")[lineNumber - 1];
        const secondMatch = re.exec(parsererrorText);
        if (line && secondMatch) {
          const columnIndex = Number(secondMatch[0]) - 1;
          if (line[columnIndex]) {
            msg +=
              `\nThe error might be located at xml line ${lineNumber} column ${columnIndex}\n` +
              `${line}\n${"-".repeat(columnIndex - 1)}^`;
          }
        }
      }
    }
    throw new Error(msg);
  }
  return doc;
 }
 export interface TemplateSetConfig {
  dev?: boolean;
  translatableAttributes?: string[];
  translateFn?: (s: string) => string;
  templates?: string | Document;
 }
 export class TemplateSet {
  dev: boolean;
  rawTemplates: typeof globalTemplates = Object.create(globalTemplates);
  templates: { [name: string]: Template } = {};
  translateFn?: (s: string) => string;
  translatableAttributes?: string[];
  utils: typeof UTILS = Object.assign({}, UTILS, {
    call: (owner: any, subTemplate: string, ctx: any, parent: any, key: any) => {
      const template = this.getTemplate(subTemplate);
      return toggler(subTemplate, template.call(owner, ctx, parent, key));
    },
    getTemplate: (name: string) => this.getTemplate(name),
  });
  constructor(config: TemplateSetConfig = {}) {
    this.dev = config.dev || false;
    this.translateFn = config.translateFn;
    this.translatableAttributes = config.translatableAttributes;
    if (config.templates) {
      this.addTemplates(config.templates);
    }
  }
  addTemplate(name: string, template: string | Node, options: { allowDuplicate?: boolean } = {}) {
    if (name in this.rawTemplates && !options.allowDuplicate) {
      throw new Error(`Template ${name} already defined`);
    }
    this.rawTemplates[name] = template;
  }
  addTemplates(xml: string | Document, options: { allowDuplicate?: boolean } = {}) {
    if (!xml) {
      // empty string
      return;
    }
    xml = xml instanceof Document ? xml : parseXML(xml);
    for (const template of xml.querySelectorAll("[t-name]")) {
      const name = template.getAttribute("t-name")!;
      template.removeAttribute("t-name");
      this.addTemplate(name, template, options);
    }
  }
  getTemplate(name: string): Template {
    if (!(name in this.templates)) {
      const rawTemplate = this.rawTemplates[name];
      if (rawTemplate === undefined) {
        throw new Error(`Missing template: "${name}"`);
      }
      const templateFn = this._compileTemplate(name, rawTemplate);
      // first add a function to lazily get the template, in case there is a
      // recursive call to the template name
      this.templates[name] = (context, parent) => this.templates[name](context, parent);
      const template = templateFn(bdom, this.utils);
      this.templates[name] = template;
    }
    return this.templates[name];
  }
  _compileTemplate(name: string, template: string | Node) {
    return compile(template, {
      name,
      dev: this.dev,
      translateFn: this.translateFn,
      translatableAttributes: this.translatableAttributes,
    });
  }
 }
 // -----------------------------------------------------------------------------
 //  xml tag helper
 // -----------------------------------------------------------------------------
 export function xml(...args: Parameters<typeof String.raw>) {
  const name = `__template__${xml.nextId++}`;
  const value = String.raw(...args);
  globalTemplates[name] = value;
  return name;
 }
 xml.nextId = 1;
@@ -1,167 +0,0 @@
 import type { Setter } from "./block_compiler";
 const { setAttribute: elemSetAttribute, removeAttribute } = Element.prototype;
 const tokenList = DOMTokenList.prototype;
 const tokenListAdd = tokenList.add;
 const tokenListRemove = tokenList.remove;
 const isArray = Array.isArray;
 const { split, trim } = String.prototype;
 const wordRegexp = /\s+/;
 /**
 * We regroup here all code related to updating attributes in a very loose sense:
 * attributes, properties and classs are all managed by the functions in this
 * file.
 */
 function setAttribute(this: HTMLElement, key: string, value: any) {
  switch (value) {
    case false:
    case undefined:
      removeAttribute.call(this, key);
      break;
    case true:
      elemSetAttribute.call(this, key, "");
      break;
    default:
      elemSetAttribute.call(this, key, value);
  }
 }
 export function createAttrUpdater(attr: string): Setter<HTMLElement> {
  return function (this: HTMLElement, value: any) {
    setAttribute.call(this, attr, value);
  };
 }
 export function attrsSetter(this: HTMLElement, attrs: any) {
  if (isArray(attrs)) {
    setAttribute.call(this, attrs[0], attrs[1]);
  } else {
    for (let k in attrs) {
      setAttribute.call(this, k, attrs[k]);
    }
  }
 }
 export function attrsUpdater(this: HTMLElement, attrs: any, oldAttrs: any) {
  if (isArray(attrs)) {
    const name = attrs[0];
    const val = attrs[1];
    if (name === oldAttrs[0]) {
      if (val === oldAttrs[1]) {
        return;
      }
      setAttribute.call(this, name, val);
    } else {
      removeAttribute.call(this, oldAttrs[0]);
      setAttribute.call(this, name, val);
    }
  } else {
    for (let k in oldAttrs) {
      if (!(k in attrs)) {
        removeAttribute.call(this, k);
      }
    }
    for (let k in attrs) {
      const val = attrs[k];
      if (val !== oldAttrs[k]) {
        setAttribute.call(this, k, val);
      }
    }
  }
 }
 function toClassObj(expr: string | number | { [c: string]: any }) {
  const result: { [c: string]: any } = {};
  switch (typeof expr) {
    case "string":
      // we transform here a list of classes into an object:
      //  'hey you' becomes {hey: true, you: true}
      const str = trim.call(expr);
      if (!str) {
        return {};
      }
      let words = split.call(str, wordRegexp);
      for (let i = 0, l = words.length; i < l; i++) {
        result[words[i]] = true;
      }
      return result;
    case "object":
      // this is already an object but we may need to split keys:
      // {'a': true, 'b c': true} should become {a: true, b: true, c: true}
      for (let key in expr as any) {
        const value = (expr as any)[key];
        if (value) {
          const words = split.call(key, wordRegexp);
          for (let word of words) {
            result[word] = value;
          }
        }
      }
      return result;
    case "undefined":
      return {};
    case "number":
      return { [expr as number]: true };
    default:
      return { [expr as any]: true };
  }
 }
 export function setClass(this: HTMLElement, val: any) {
  val = val === "" ? {} : toClassObj(val);
  // add classes
  const cl = this.classList;
  for (let c in val) {
    tokenListAdd.call(cl, c);
  }
 }
 export function updateClass(this: HTMLElement, val: any, oldVal: any) {
  oldVal = oldVal === "" ? {} : toClassObj(oldVal);
  val = val === "" ? {} : toClassObj(val);
  const cl = this.classList;
  // remove classes
  for (let c in oldVal) {
    if (!(c in val)) {
      tokenListRemove.call(cl, c);
    }
  }
  // add classes
  for (let c in val) {
    if (!(c in oldVal)) {
      tokenListAdd.call(cl, c);
    }
  }
 }
 export function makePropSetter(name: string): Setter<HTMLElement> {
  return function setProp(this: HTMLElement, value: any) {
    (this as any)[name] = value;
  };
 }
 export function isProp(tag: string, key: string): boolean {
  switch (tag) {
    case "input":
      return (
        key === "checked" ||
        key === "indeterminate" ||
        key === "value" ||
        key === "readonly" ||
        key === "disabled"
      );
    case "option":
      return key === "selected" || key === "disabled";
    case "textarea":
      return key === "value" || key === "readonly" || key === "disabled";
    case "select":
      return key === "value" || key === "disabled";
    case "button":
    case "optgroup":
      return key === "disabled";
  }
  return false;
 }
@@ -1,613 +0,0 @@
 import {
  attrsSetter,
  attrsUpdater,
  createAttrUpdater,
  isProp,
  makePropSetter,
  setClass,
  updateClass,
 } from "./attributes";
 import { config } from "./config";
 import { createEventHandler } from "./events";
 import type { VNode } from "./index";
 import { VMulti } from "./multi";
 import { toText } from "./text";
 const getDescriptor = (o: any, p: any) => Object.getOwnPropertyDescriptor(o, p)!;
 const nodeProto = Node.prototype;
 const elementProto = Element.prototype;
 const characterDataProto = CharacterData.prototype;
 const characterDataSetData = getDescriptor(characterDataProto, "data").set!;
 const nodeGetFirstChild = getDescriptor(nodeProto, "firstChild").get!;
 const nodeGetNextSibling = getDescriptor(nodeProto, "nextSibling").get!;
 const NO_OP = () => {};
 // -----------------------------------------------------------------------------
 // Main compiler code
 // -----------------------------------------------------------------------------
 type BlockType = (data?: any[], children?: VNode[]) => VNode;
 const cache: { [key: string]: BlockType } = {};
 /**
 * Compiling blocks is a multi-step process:
 *
 * 1. build an IntermediateTree from the HTML element. This intermediate tree
 *    is a binary tree structure that encode dynamic info sub nodes, and the
 *    path required to reach them
 * 2. process the tree to build a block context, which is an object that aggregate
 *    all dynamic info in a list, and also, all ref indexes.
 * 3. process the context to build appropriate builder/setter functions
 * 4. make a dynamic block class, which will efficiently collect references and
 *    create/update dynamic locations/children
 *
 * @param str
 * @returns a new block type, that can build concrete blocks
 */
 export function createBlock(str: string, deepRemove: boolean = false): BlockType {
  if (str in cache) {
    return cache[str];
  }
  // step 0: prepare html base element
  const doc = new DOMParser().parseFromString(`<t>${str}</t>`, "text/xml");
  const node = doc.firstChild!.firstChild!;
  if (config.shouldNormalizeDom) {
    normalizeNode(node as any);
  }
  // step 1: prepare intermediate tree
  const tree = buildTree(node);
  // step 2: prepare block context
  const context = buildContext(tree);
  // step 3: build the final block class
  const template = tree.el as HTMLElement;
  const Block = buildBlock(template, context, deepRemove);
  cache[str] = Block;
  return Block;
 }
 // -----------------------------------------------------------------------------
 // Helper
 // -----------------------------------------------------------------------------
 function normalizeNode(node: HTMLElement | Text) {
  if (node.nodeType === Node.TEXT_NODE) {
    if (!/\S/.test((node as Text).textContent!)) {
      (node as Text).remove();
      return;
    }
  }
  if (node.nodeType === Node.ELEMENT_NODE) {
    if ((node as HTMLElement).tagName === "pre") {
      return;
    }
  }
  for (let i = node.childNodes.length - 1; i >= 0; --i) {
    normalizeNode(node.childNodes.item(i) as any);
  }
 }
 // -----------------------------------------------------------------------------
 // building a intermediate tree
 // -----------------------------------------------------------------------------
 interface DynamicInfo {
  idx: number;
  refIdx?: number;
  type: "text" | "child" | "handler" | "attribute" | "attributes" | "ref";
  isOnlyChild?: boolean;
  name?: string;
  tag?: string;
  event?: string;
 }
 interface IntermediateTree {
  parent: IntermediateTree | null;
  firstChild: IntermediateTree | null;
  nextSibling: IntermediateTree | null;
  el: Node;
  info: DynamicInfo[];
  isRef?: boolean;
  refIdx?: number;
  refN: number;
  currentNS: string | null;
 }
 function buildTree(
  node: Node,
  parent: IntermediateTree | null = null,
  domParentTree: IntermediateTree | null = null
 ): IntermediateTree {
  switch (node.nodeType) {
    case Node.ELEMENT_NODE: {
      // HTMLElement
      let currentNS = domParentTree && domParentTree.currentNS;
      const tagName = (node as Element).tagName;
      let el: Node | undefined = undefined;
      const info: DynamicInfo[] = [];
      if (tagName.startsWith("block-text-")) {
        const index = parseInt(tagName.slice(11), 10);
        info.push({ type: "text", idx: index });
        el = document.createTextNode("");
      }
      if (tagName.startsWith("block-child-")) {
        if (!domParentTree!.isRef) {
          addRef(domParentTree!);
        }
        const index = parseInt(tagName.slice(12), 10);
        info.push({ type: "child", idx: index });
        el = document.createTextNode("");
      }
      const attrs = (node as Element).attributes;
      const ns = attrs.getNamedItem("block-ns");
      if (ns) {
        attrs.removeNamedItem("block-ns");
        currentNS = ns.value;
      }
      if (!el) {
        el = currentNS
          ? document.createElementNS(currentNS, tagName)
          : document.createElement(tagName);
      }
      if (el instanceof Element) {
        for (let i = 0; i < attrs.length; i++) {
          const attrName = attrs[i].name;
          const attrValue = attrs[i].value;
          if (attrName.startsWith("block-handler-")) {
            const idx = parseInt(attrName.slice(14), 10);
            info.push({
              type: "handler",
              idx,
              event: attrValue,
            });
          } else if (attrName.startsWith("block-attribute-")) {
            const idx = parseInt(attrName.slice(16), 10);
            info.push({
              type: "attribute",
              idx,
              name: attrValue,
              tag: tagName,
            });
          } else if (attrName === "block-attributes") {
            info.push({
              type: "attributes",
              idx: parseInt(attrValue, 10),
            });
          } else if (attrName === "block-ref") {
            info.push({
              type: "ref",
              idx: parseInt(attrValue, 10),
            });
          } else {
            el.setAttribute(attrs[i].name, attrValue);
          }
        }
      }
      const tree: IntermediateTree = {
        parent,
        firstChild: null,
        nextSibling: null,
        el,
        info,
        refN: 0,
        currentNS,
      };
      if (node.firstChild) {
        const childNode = node.childNodes[0];
        if (
          node.childNodes.length === 1 &&
          childNode.nodeType === Node.ELEMENT_NODE &&
          (childNode as Element).tagName.startsWith("block-child-")
        ) {
          const tagName = (childNode as Element).tagName;
          const index = parseInt(tagName.slice(12), 10);
          info.push({ idx: index, type: "child", isOnlyChild: true });
        } else {
          tree.firstChild = buildTree(node.firstChild, tree, tree);
          el.appendChild(tree.firstChild.el);
          let curNode: Node | null = node.firstChild;
          let curTree: IntermediateTree | null = tree.firstChild;
          while ((curNode = curNode.nextSibling)) {
            curTree.nextSibling = buildTree(curNode, curTree, tree);
            el.appendChild(curTree.nextSibling.el);
            curTree = curTree.nextSibling;
          }
        }
      }
      if (tree.info.length) {
        addRef(tree);
      }
      return tree;
    }
    case Node.TEXT_NODE:
    case Node.COMMENT_NODE: {
      // text node or comment node
      const el =
        node.nodeType === Node.TEXT_NODE
          ? document.createTextNode(node.textContent!)
          : document.createComment(node.textContent!);
      return {
        parent: parent,
        firstChild: null,
        nextSibling: null,
        el,
        info: [],
        refN: 0,
        currentNS: null,
      };
    }
  }
  throw new Error("boom");
 }
 function addRef(tree: IntermediateTree) {
  tree.isRef = true;
  do {
    tree.refN++;
  } while ((tree = tree.parent as any));
 }
 function parentTree(tree: IntermediateTree): IntermediateTree | null {
  let parent = tree.parent;
  while (parent && parent.nextSibling === tree) {
    tree = parent;
    parent = parent.parent;
  }
  return parent;
 }
 // -----------------------------------------------------------------------------
 // Building a block context
 // -----------------------------------------------------------------------------
 interface RefCollector {
  idx: number;
  prevIdx: number;
  getVal: Function;
 }
 export type Setter<T = any> = (this: T, value: any) => void;
 export type Updater<T = any> = (this: T, value: any, oldVal: any) => void;
 interface Location {
  refIdx: number;
  setData: Setter;
  updateData: Updater;
 }
 interface IndexedLocation extends Location {
  idx: number;
 }
 interface Child {
  parentRefIdx: number;
  afterRefIdx?: number;
  isOnlyChild?: boolean;
 }
 interface BlockCtx {
  refN: number;
  collectors: RefCollector[];
  locations: IndexedLocation[];
  children: Child[];
  cbRefs: number[];
 }
 function buildContext(tree: IntermediateTree, ctx?: BlockCtx, fromIdx?: number): BlockCtx {
  if (!ctx) {
    const children = new Array(tree.info.filter((v) => v.type === "child").length);
    ctx = { collectors: [], locations: [], children, cbRefs: [], refN: tree.refN };
    fromIdx = 0;
  }
  if (tree.refN) {
    const initialIdx = fromIdx!;
    const isRef = tree.isRef;
    const firstChild = tree.firstChild ? tree.firstChild.refN : 0;
    const nextSibling = tree.nextSibling ? tree.nextSibling.refN : 0;
    //node
    if (isRef) {
      for (let info of tree.info) {
        info.refIdx = initialIdx!;
      }
      tree.refIdx = initialIdx!;
      updateCtx(ctx, tree);
      fromIdx!++;
    }
    // right
    if (nextSibling) {
      const idx = fromIdx! + firstChild;
      ctx.collectors.push({ idx, prevIdx: initialIdx, getVal: nodeGetNextSibling });
      buildContext(tree.nextSibling!, ctx, idx);
    }
    // left
    if (firstChild) {
      ctx.collectors.push({ idx: fromIdx!, prevIdx: initialIdx, getVal: nodeGetFirstChild });
      buildContext(tree.firstChild!, ctx, fromIdx!);
    }
  }
  return ctx;
 }
 function updateCtx(ctx: BlockCtx, tree: IntermediateTree) {
  for (let info of tree.info) {
    switch (info.type) {
      case "text":
        ctx.locations.push({
          idx: info.idx,
          refIdx: info.refIdx!,
          setData: setText,
          updateData: setText,
        });
        break;
      case "child":
        if (info.isOnlyChild) {
          // tree is the parentnode here
          ctx.children[info.idx] = {
            parentRefIdx: info.refIdx!,
            isOnlyChild: true,
          };
        } else {
          // tree is the anchor text node
          ctx.children[info.idx] = {
            parentRefIdx: parentTree(tree)!.refIdx!,
            afterRefIdx: info.refIdx!,
          };
        }
        break;
      case "attribute": {
        const refIdx = info.refIdx!;
        let updater: any;
        let setter: any;
        if (isProp(info.tag!, info.name!)) {
          const setProp = makePropSetter(info.name!);
          setter = setProp;
          updater = setProp;
        } else if (info.name === "class") {
          setter = setClass;
          updater = updateClass;
        } else {
          setter = createAttrUpdater(info.name!);
          updater = setter;
        }
        ctx.locations.push({
          idx: info.idx,
          refIdx,
          setData: setter,
          updateData: updater,
        });
        break;
      }
      case "attributes":
        ctx.locations.push({
          idx: info.idx,
          refIdx: info.refIdx!,
          setData: attrsSetter,
          updateData: attrsUpdater,
        });
        break;
      case "handler": {
        const { setup, update } = createEventHandler(info.event!);
        ctx.locations.push({
          idx: info.idx,
          refIdx: info.refIdx!,
          setData: setup,
          updateData: update,
        });
        break;
      }
      case "ref":
        ctx.cbRefs.push(info.idx);
        ctx.locations.push({
          idx: info.idx,
          refIdx: info.refIdx!,
          setData: setRef,
          updateData: NO_OP,
        });
    }
  }
 }
 // -----------------------------------------------------------------------------
 // building the concrete block class
 // -----------------------------------------------------------------------------
 function buildBlock(template: HTMLElement, ctx: BlockCtx, deepRemove: boolean): BlockType {
  let B = createBlockClass(template, ctx);
  if (ctx.cbRefs.length) {
    const refs = ctx.cbRefs;
    B = class extends B {
      remove() {
        super.remove();
        for (let ref of refs) {
          let fn = (this as any).data[ref];
          fn(null);
        }
      }
    };
  }
  if (ctx.children.length) {
    B = class extends B {
      children: (VNode | undefined)[] | undefined;
      constructor(data?: any[], children?: VNode[]) {
        super(data);
        this.children = children;
      }
    };
    B.prototype.beforeRemove = VMulti.prototype.beforeRemove;
    if (deepRemove) {
      const blockRemove = B.prototype.remove;
      const vMultiRemove = VMulti.prototype.remove;
      B.prototype.remove = function () {
        blockRemove.call(this);
        vMultiRemove.call(this);
      };
    }
    return (data?: any[], children: (VNode | undefined)[] = []) => new B(data, children);
  }
  return (data?: any[]) => new B(data);
 }
 type Constructor<T> = new (...args: any[]) => T;
 type BlockClass = Constructor<VNode<any>>;
 function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
  const { refN, collectors, children } = ctx;
  const colN = collectors.length;
  ctx.locations.sort((a, b) => a.idx - b.idx);
  const locations: Location[] = ctx.locations.map((loc) => ({
    refIdx: loc.refIdx,
    setData: loc.setData,
    updateData: loc.updateData,
  }));
  const locN = locations.length;
  const childN = children.length;
  const childrenLocs = children;
  const isDynamic = refN > 0;
  // these values are defined here to make them faster to lookup in the class
  // block scope
  const nodeCloneNode = nodeProto.cloneNode;
  const nodeInsertBefore = nodeProto.insertBefore;
  const elementRemove = elementProto.remove;
  return class Block {
    el: HTMLElement | undefined;
    refs: Node[] | undefined;
    data: any[] | undefined;
    parentEl?: HTMLElement | undefined;
    children?: (VNode | undefined)[];
    constructor(data?: any[]) {
      this.data = data;
    }
    beforeRemove() {}
    remove() {
      console.log('ddd')
      elementRemove.call(this.el);
    }
    firstNode(): Node {
      return this.el!;
    }
    moveBefore(other: Block | null, afterNode: Node | null) {
      const target = other ? other.el! : afterNode;
      nodeInsertBefore.call(this.parentEl, this.el!, target);
    }
    mount(parent: HTMLElement, afterNode: Node | null) {
      const el = nodeCloneNode.call(template, true);
      nodeInsertBefore.call(parent, el, afterNode);
      if (isDynamic) {
        // collecting references
        const refs: Node[] = new Array(refN);
        this.refs = refs;
        refs[0] = el;
        for (let i = 0; i < colN; i++) {
          const w = collectors[i];
          refs[w.idx] = w.getVal.call(refs[w.prevIdx]);
        }
        // applying data to all update points
        if (locN) {
          const data = this.data!;
          for (let i = 0; i < locN; i++) {
            const loc = locations[i];
            loc.setData.call(refs[loc.refIdx], data[i]);
          }
        }
        // preparing all children
        if (childN) {
          const children = this.children;
          for (let i = 0; i < childN; i++) {
            const child = children![i];
            if (child) {
              const loc = childrenLocs[i];
              const afterNode = loc.afterRefIdx ? refs[loc.afterRefIdx] : null;
              child.isOnlyChild = loc.isOnlyChild;
              child.mount(refs[loc.parentRefIdx] as any, afterNode);
            }
          }
        }
      }
      this.el = el as HTMLElement;
      this.parentEl = parent;
    }
    patch(other: Block, withBeforeRemove: boolean) {
      if (this === other) {
        return;
      }
      const refs = this.refs!;
      // update texts/attributes/
      if (locN) {
        const data1 = this.data!;
        const data2 = other.data!;
        for (let i = 0; i < locN; i++) {
          const val1 = data1[i];
          const val2 = data2[i];
          if (val1 !== val2) {
            const loc = locations[i];
            loc.updateData.call(refs[loc.refIdx], val2, val1);
          }
        }
        this.data = data2;
      }
      // update children
      if (childN) {
        let children1 = this.children;
        const children2 = other.children;
        for (let i = 0; i < childN; i++) {
          const child1 = children1![i];
          const child2 = children2![i];
          if (child1) {
            if (child2) {
              child1.patch(child2, withBeforeRemove);
            } else {
              if (withBeforeRemove) {
                child1.beforeRemove();
              }
              child1.remove();
              children1![i] = undefined;
            }
          } else if (child2) {
            const loc = childrenLocs[i];
            const afterNode = loc.afterRefIdx ? refs[loc.afterRefIdx] : null;
            child2.mount(refs[loc.parentRefIdx] as any, afterNode);
            children1![i] = child2;
          }
        }
      }
    }
    toString() {
      const div = document.createElement("div");
      this.mount(div, null);
      return div.innerHTML;
    }
  };
 }
 function setText(this: Text, value: any) {
  characterDataSetData.call(this, toText(value));
 }
 function setRef(this: HTMLElement, fn: any) {
  fn(this);
 }
@@ -1,28 +0,0 @@
 export function filterOutModifiersFromData(dataList: any[]): { modifiers: string[]; data: any[] } {
  dataList = dataList.slice();
  const modifiers = [];
  let elm;
  while ((elm = dataList[0]) && typeof elm === "string") {
    modifiers.push(dataList.shift());
  }
  return { modifiers, data: dataList };
 }
 export const config = {
  // whether or not blockdom should normalize DOM whenever a block is created.
  // Normalizing dom mean removing empty text nodes (or containing only spaces)
  shouldNormalizeDom: true,
  // this is the main event handler. Every event handler registered with blockdom
  // will go through this function, giving it the data registered in the block
  // and the event
  mainEventHandler: (data: any, ev: Event, currentTarget?: EventTarget | null): boolean => {
    if (typeof data === "function") {
      data(ev);
    } else if (Array.isArray(data)) {
      data = filterOutModifiersFromData(data).data;
      data[0](data[1], ev);
    }
    return false;
  },
 };
@@ -1,90 +0,0 @@
 import { config } from "./config";
 type EventHandlerSetter = (this: HTMLElement, data: any) => void;
 interface EventHandlerCreator {
  setup: EventHandlerSetter;
  update: EventHandlerSetter;
 }
 export function createEventHandler(rawEvent: string): EventHandlerCreator {
  const eventName = rawEvent.split(".")[0];
  const capture = rawEvent.includes(".capture");
  if (rawEvent.includes(".synthetic")) {
    return createSyntheticHandler(eventName, capture);
  } else {
    return createElementHandler(eventName, capture);
  }
 }
 // Native listener
 let nextNativeEventId = 1;
 function createElementHandler(evName: string, capture: boolean = false): EventHandlerCreator {
  let eventKey = `__event__${evName}_${nextNativeEventId++}`;
  if (capture) {
    eventKey = `${eventKey}_capture`;
  }
  function listener(ev: Event) {
    const currentTarget = ev.currentTarget;
    if (!currentTarget || !document.contains(currentTarget as HTMLElement)) return;
    const data = (currentTarget as any)[eventKey];
    if (!data) return;
    config.mainEventHandler(data, ev, currentTarget);
  }
  function setup(this: HTMLElement, data: any) {
    (this as any)[eventKey] = data;
    this.addEventListener(evName, listener, { capture });
  }
  function update(this: HTMLElement, data: any) {
    (this as any)[eventKey] = data;
  }
  return { setup, update };
 }
 // Synthetic handler: a form of event delegation that allows placing only one
 // listener per event type.
 let nextSyntheticEventId = 1;
 function createSyntheticHandler(evName: string, capture: boolean = false): EventHandlerCreator {
  let eventKey = `__event__synthetic_${evName}`;
  if (capture) {
    eventKey = `${eventKey}_capture`;
  }
  setupSyntheticEvent(evName, eventKey, capture);
  const currentId = nextSyntheticEventId++;
  function setup(this: HTMLElement, data: any) {
    const _data = (this as any)[eventKey] || {};
    _data[currentId] = data;
    (this as any)[eventKey] = _data;
  }
  return { setup, update: setup };
 }
 function nativeToSyntheticEvent(eventKey: string, event: Event) {
  let dom = event.target;
  while (dom !== null) {
    const _data = (dom as any)[eventKey];
    if (_data) {
      for (const data of Object.values(_data)) {
        const stopped = config.mainEventHandler(data, event, dom);
        if (stopped) return;
      }
    }
    dom = (dom as any).parentNode;
  }
 }
 const CONFIGURED_SYNTHETIC_EVENTS: { [event: string]: boolean } = {};
 function setupSyntheticEvent(evName: string, eventKey: string, capture: boolean = false) {
  if (CONFIGURED_SYNTHETIC_EVENTS[eventKey]) {
    return;
  }
  document.addEventListener(evName, (event) => nativeToSyntheticEvent(eventKey, event), {
    capture,
  });
  CONFIGURED_SYNTHETIC_EVENTS[eventKey] = true;
 }
@@ -1,87 +0,0 @@
 import type { VNode } from "./index";
 const nodeProto = Node.prototype;
 const nodeInsertBefore = nodeProto.insertBefore;
 const nodeRemoveChild = nodeProto.removeChild;
 class VHtml {
  html: string;
  parentEl?: HTMLElement | undefined;
  content: ChildNode[] = [];
  constructor(html: string) {
    this.html = html;
  }
  mount(parent: HTMLElement, afterNode: Node | null) {
    this.parentEl = parent;
    const template = document.createElement("template");
    template.innerHTML = this.html;
    this.content = [...(template.content.childNodes as any)];
    for (let elem of this.content) {
      nodeInsertBefore.call(parent, elem, afterNode);
    }
    if (!this.content.length) {
      const textNode = document.createTextNode("");
      this.content.push(textNode);
      nodeInsertBefore.call(parent, textNode, afterNode);
    }
  }
  moveBefore(other: VHtml | null, afterNode: Node | null) {
    const target = other ? other.content[0] : afterNode;
    const parent = this.parentEl;
    for (let elem of this.content) {
      nodeInsertBefore.call(parent, elem, target);
    }
  }
  patch(other: VHtml) {
    if (this === other) {
      return;
    }
    const html2 = other.html;
    if (this.html !== html2) {
      const parent = this.parentEl;
      // insert new html in front of current
      const afterNode = this.content[0];
      const template = document.createElement("template");
      template.innerHTML = html2;
      const content = [...(template.content.childNodes as any)];
      for (let elem of content) {
        nodeInsertBefore.call(parent, elem, afterNode);
      }
      if (!content.length) {
        const textNode = document.createTextNode("");
        content.push(textNode);
        nodeInsertBefore.call(parent, textNode, afterNode);
      }
      // remove current content
      this.remove();
      this.content = content;
    }
  }
  beforeRemove() {}
  remove() {
    const parent = this.parentEl;
    for (let elem of this.content) {
      nodeRemoveChild.call(parent, elem);
    }
  }
  firstNode(): Node {
    return this.content[0]!;
  }
  toString() {
    return this.html;
  }
 }
 export function html(str: string): VNode<VHtml> {
  return new VHtml(str);
 }
@@ -1,44 +0,0 @@
 export { config } from "./config";
 export { toggler } from "./toggler";
 export { createBlock } from "./block_compiler";
 export { list } from "./list";
 export { multi } from "./multi";
 export { text, comment } from "./text";
 export { html } from "./html";
 export interface VNode<T = any> {
  mount(parent: HTMLElement, afterNode: Node | null): void;
  moveBefore(other: T | null, afterNode: Node | null): void;
  patch(other: T, withBeforeRemove: boolean): void;
  beforeRemove(): void;
  remove(): void;
  firstNode(): Node | undefined;
  el?: undefined | HTMLElement | Text;
  parentEl?: undefined | HTMLElement;
  isOnlyChild?: boolean | undefined;
  key?: any;
 }
 export type BDom = VNode<any>;
 export function mount(vnode: VNode, fixture: HTMLElement, afterNode: Node | null = null) {
  vnode.mount(fixture, afterNode);
 }
 export function patch(vnode1: VNode, vnode2: VNode, withBeforeRemove: boolean = false) {
  vnode1.patch(vnode2, withBeforeRemove);
 }
 export function remove(vnode: VNode, withBeforeRemove: boolean = false) {
  if (withBeforeRemove) {
    vnode.beforeRemove();
  }
  vnode.remove();
 }
 export function withKey(vnode: VNode, key: any) {
  vnode.key = key;
  return vnode;
 }
@@ -1,241 +0,0 @@
 import type { VNode } from "./index";
 const getDescriptor = (o: any, p: any) => Object.getOwnPropertyDescriptor(o, p)!;
 const nodeProto = Node.prototype;
 const nodeInsertBefore = nodeProto.insertBefore;
 const nodeAppendChild = nodeProto.appendChild;
 const nodeRemoveChild = nodeProto.removeChild;
 const nodeSetTextContent = getDescriptor(nodeProto, "textContent").set!;
 // -----------------------------------------------------------------------------
 // List Node
 // -----------------------------------------------------------------------------
 class VList {
  children: VNode[];
  anchor: Node | undefined;
  parentEl?: HTMLElement | undefined;
  isOnlyChild?: boolean | undefined;
  deepRemove: boolean;
  constructor(children: VNode[], deepRemove: boolean) {
    this.children = children;
    this.deepRemove = deepRemove;
  }
  mount(parent: HTMLElement, afterNode: Node | null) {
    const children = this.children;
    const _anchor = document.createTextNode("");
    this.anchor = _anchor;
    nodeInsertBefore.call(parent, _anchor, afterNode);
    const l = children.length;
    if (l) {
      const mount = children[0].mount;
      for (let i = 0; i < l; i++) {
        mount.call(children[i], parent, _anchor);
      }
    }
    this.parentEl = parent;
  }
  moveBefore(other: VList | null, afterNode: Node | null) {
    if (other) {
      const next = other!.children[0];
      afterNode = (next ? next.firstNode() : other!.anchor) || null;
    }
    const children = this.children;
    for (let i = 0, l = children.length; i < l; i++) {
      children[i].moveBefore(null, afterNode);
    }
    this.parentEl!.insertBefore(this.anchor!, afterNode);
  }
  patch(other: VList, withBeforeRemove: boolean) {
    if (this === other) {
      return;
    }
    const ch1 = this.children;
    const ch2: VNode[] = other.children;
    if (ch2.length === 0 && ch1.length === 0) {
      return;
    }
    this.children = ch2;
    const proto = ch2[0] || ch1[0];
    const {
      mount: cMount,
      patch: cPatch,
      remove: cRemove,
      beforeRemove,
      moveBefore: cMoveBefore,
      firstNode: cFirstNode,
    } = proto;
    const _anchor = this.anchor!;
    const isOnlyChild = this.isOnlyChild;
    const parent = this.parentEl!;
    // fast path: no new child => only remove
    if (ch2.length === 0 && isOnlyChild && !this.deepRemove) {
      if (withBeforeRemove) {
        for (let i = 0, l = ch1.length; i < l; i++) {
          beforeRemove.call(ch1[i]);
        }
      }
      nodeSetTextContent.call(parent, "");
      nodeAppendChild.call(parent, _anchor);
      return;
    }
    let startIdx1 = 0;
    let startIdx2 = 0;
    let startVn1 = ch1[0];
    let startVn2 = ch2[0];
    let endIdx1 = ch1.length - 1;
    let endIdx2 = ch2.length - 1;
    let endVn1 = ch1[endIdx1];
    let endVn2 = ch2[endIdx2];
    let mapping: any = undefined;
    while (startIdx1 <= endIdx1 && startIdx2 <= endIdx2) {
      // -------------------------------------------------------------------
      if (startVn1 === null) {
        startVn1 = ch1[++startIdx1];
        continue;
      }
      // -------------------------------------------------------------------
      if (endVn1 === null) {
        endVn1 = ch1[--endIdx1];
        continue;
      }
      // -------------------------------------------------------------------
      let startKey1 = startVn1.key;
      let startKey2 = startVn2.key;
      if (startKey1 === startKey2) {
        cPatch.call(startVn1, startVn2, withBeforeRemove);
        ch2[startIdx2] = startVn1;
        startVn1 = ch1[++startIdx1];
        startVn2 = ch2[++startIdx2];
        continue;
      }
      // -------------------------------------------------------------------
      let endKey1 = endVn1.key;
      let endKey2 = endVn2.key;
      if (endKey1 === endKey2) {
        cPatch.call(endVn1, endVn2, withBeforeRemove);
        ch2[endIdx2] = endVn1;
        endVn1 = ch1[--endIdx1];
        endVn2 = ch2[--endIdx2];
        continue;
      }
      // -------------------------------------------------------------------
      if (startKey1 === endKey2) {
        // bnode moved right
        cPatch.call(startVn1, endVn2, withBeforeRemove);
        ch2[endIdx2] = startVn1;
        const nextChild = ch2[endIdx2 + 1];
        cMoveBefore.call(startVn1, nextChild, _anchor);
        startVn1 = ch1[++startIdx1];
        endVn2 = ch2[--endIdx2];
        continue;
      }
      // -------------------------------------------------------------------
      if (endKey1 === startKey2) {
        // bnode moved left
        cPatch.call(endVn1, startVn2, withBeforeRemove);
        ch2[startIdx2] = endVn1;
        const nextChild = ch1[startIdx1];
        cMoveBefore.call(endVn1, nextChild, _anchor);
        endVn1 = ch1[--endIdx1];
        startVn2 = ch2[++startIdx2];
        continue;
      }
      // -------------------------------------------------------------------
      mapping = mapping || createMapping(ch1, startIdx1, endIdx1);
      let idxInOld = mapping[startKey2];
      if (idxInOld === undefined) {
        cMount.call(startVn2, parent, cFirstNode.call(startVn1) || null);
      } else {
        const elmToMove = ch1[idxInOld];
        cMoveBefore.call(elmToMove, startVn1, null);
        cPatch.call(elmToMove, startVn2, withBeforeRemove);
        ch2[startIdx2] = elmToMove;
        ch1[idxInOld] = null as any;
      }
      startVn2 = ch2[++startIdx2];
    }
    // ---------------------------------------------------------------------
    if (startIdx1 <= endIdx1 || startIdx2 <= endIdx2) {
      if (startIdx1 > endIdx1) {
        const nextChild = ch2[endIdx2 + 1];
        const anchor = nextChild ? cFirstNode.call(nextChild) || null : _anchor;
        for (let i = startIdx2; i <= endIdx2; i++) {
          cMount.call(ch2[i], parent, anchor);
        }
      } else {
        for (let i = startIdx1; i <= endIdx1; i++) {
          let ch = ch1[i];
          if (ch) {
            if (withBeforeRemove) {
              beforeRemove.call(ch);
            }
            cRemove.call(ch);
          }
        }
      }
    }
  }
  beforeRemove() {
    const children = this.children;
    const l = children.length;
    if (l) {
      const beforeRemove = children[0].beforeRemove;
      for (let i = 0; i < l; i++) {
        beforeRemove.call(children[i]);
      }
    }
  }
  remove() {
    const { parentEl, anchor } = this;
    if (this.isOnlyChild && !this.deepRemove) {
      nodeSetTextContent.call(parentEl, "");
    } else {
      const children = this.children;
      const l = children.length;
      if (l) {
        const remove = children[0].remove;
        for (let i = 0; i < l; i++) {
          remove.call(children[i]);
        }
      }
      nodeRemoveChild.call(parentEl, anchor!);
    }
  }
  firstNode(): Node | undefined {
    const child = this.children[0];
    return child ? child.firstNode() : undefined;
  }
  toString(): string {
    return this.children.map((c) => c!.toString()).join("");
  }
 }
 export function list(children: VNode[], deepRemove = false): VNode<VList> {
  return new VList(children, deepRemove);
 }
 function createMapping(ch1: any[], startIdx1: number, endIdx2: number): { [key: string]: any } {
  let mapping: any = {};
  for (let i = startIdx1; i <= endIdx2; i++) {
    mapping[ch1[i].key] = i;
  }
  return mapping;
 }
@@ -1,136 +0,0 @@
 import type { VNode } from "./index";
 const getDescriptor = (o: any, p: any) => Object.getOwnPropertyDescriptor(o, p)!;
 const nodeProto = Node.prototype;
 const nodeInsertBefore = nodeProto.insertBefore;
 const nodeSetTextContent = getDescriptor(nodeProto, "textContent").set!;
 const nodeRemoveChild = nodeProto.removeChild;
 // -----------------------------------------------------------------------------
 // Multi NODE
 // -----------------------------------------------------------------------------
 export class VMulti {
  children: (VNode | undefined)[];
  anchors?: Node[] | undefined;
  parentEl?: HTMLElement | undefined;
  isOnlyChild?: boolean | undefined;
  deepRemove: boolean;
  constructor(children: (VNode | undefined)[], deepRemove: boolean) {
    this.children = children;
    this.deepRemove = deepRemove;
  }
  mount(parent: HTMLElement, afterNode: Node | null) {
    const children = this.children;
    const l = children.length;
    const anchors = new Array(l);
    for (let i = 0; i < l; i++) {
      let child = children[i];
      if (child) {
        child.mount(parent, afterNode);
      } else {
        const childAnchor = document.createTextNode("");
        anchors[i] = childAnchor;
        nodeInsertBefore.call(parent, childAnchor, afterNode);
      }
    }
    this.anchors = anchors;
    this.parentEl = parent;
  }
  moveBefore(other: VMulti | null, afterNode: Node | null) {
    if (other) {
      const next = other!.children[0];
      afterNode = (next ? next.firstNode() : other!.anchors![0]) || null;
    }
    const children = this.children;
    const parent = this.parentEl;
    const anchors = this.anchors;
    for (let i = 0, l = children.length; i < l; i++) {
      let child = children[i];
      if (child) {
        child.moveBefore(null, afterNode);
      } else {
        const anchor = anchors![i];
        nodeInsertBefore.call(parent, anchor, afterNode);
      }
    }
  }
  patch(other: VMulti, withBeforeRemove: boolean) {
    if (this === other) {
      return;
    }
    const children1 = this.children;
    const children2 = other.children;
    const anchors = this.anchors!;
    const parentEl = this.parentEl!;
    for (let i = 0, l = children1.length; i < l; i++) {
      const vn1 = children1[i];
      const vn2 = children2[i];
      if (vn1) {
        if (vn2) {
          vn1.patch(vn2, withBeforeRemove);
        } else {
          const afterNode = vn1.firstNode()!;
          const anchor = document.createTextNode("");
          anchors[i] = anchor;
          nodeInsertBefore.call(parentEl, anchor, afterNode);
          if (withBeforeRemove) {
            vn1.beforeRemove();
          }
          vn1.remove();
          children1[i] = undefined;
        }
      } else if (vn2) {
        children1[i] = vn2;
        const anchor = anchors[i];
        vn2.mount(parentEl, anchor);
        nodeRemoveChild.call(parentEl, anchor);
      }
    }
  }
  beforeRemove() {
    const children = this.children;
    for (let i = 0, l = children.length; i < l; i++) {
      const child = children[i];
      if (child) {
        child.beforeRemove();
      }
    }
  }
  remove() {
    const parentEl = this.parentEl;
    if (this.isOnlyChild && !this.deepRemove) {
      nodeSetTextContent.call(parentEl, "");
    } else {
      const children = this.children;
      const anchors = this.anchors;
      for (let i = 0, l = children.length; i < l; i++) {
        const child = children[i];
        if (child) {
          child.remove();
        } else {
          nodeRemoveChild.call(parentEl, anchors![i]);
        }
      }
    }
  }
  firstNode(): Node | undefined {
    const child = this.children[0];
    return child ? child.firstNode() : this.anchors![0];
  }
  toString(): string {
    return this.children.map((c) => c!.toString()).join("");
  }
 }
 export function multi(children: (VNode | undefined)[], deepRemove = false): VNode<VMulti> {
  return new VMulti(children, deepRemove);
 }
@@ -1,87 +0,0 @@
 import type { VNode } from "./index";
 const getDescriptor = (o: any, p: any) => Object.getOwnPropertyDescriptor(o, p)!;
 const nodeProto = Node.prototype;
 const characterDataProto = CharacterData.prototype;
 const nodeInsertBefore = nodeProto.insertBefore;
 const characterDataSetData = getDescriptor(characterDataProto, "data").set!;
 const nodeRemoveChild = nodeProto.removeChild;
 abstract class VSimpleNode {
  text: string;
  parentEl?: HTMLElement | undefined;
  el?: any;
  constructor(text: string) {
    this.text = text;
  }
  mountNode(node: Node, parent: HTMLElement, afterNode: Node | null) {
    this.parentEl = parent;
    nodeInsertBefore.call(parent, node, afterNode);
    this.el = node;
  }
  moveBefore(other: VText | null, afterNode: Node | null) {
    const target = other ? other.el! : afterNode;
    nodeInsertBefore.call(this.parentEl, this.el!, target);
  }
  beforeRemove() {}
  remove() {
    nodeRemoveChild.call(this.parentEl, this.el!);
  }
  firstNode(): Node {
    return this.el!;
  }
  toString() {
    return this.text;
  }
 }
 class VText extends VSimpleNode {
  mount(parent: HTMLElement, afterNode: Node | null) {
    this.mountNode(document.createTextNode(toText(this.text)), parent, afterNode);
  }
  patch(other: VText) {
    const text2 = other.text;
    if (this.text !== text2) {
      characterDataSetData.call(this.el!, toText(text2));
      this.text = text2;
    }
  }
 }
 class VComment extends VSimpleNode {
  mount(parent: HTMLElement, afterNode: Node | null) {
    this.mountNode(document.createComment(toText(this.text)), parent, afterNode);
  }
  patch() {}
 }
 export function text(str: string): VNode<VText> {
  return new VText(str);
 }
 export function comment(str: string): VNode<VComment> {
  return new VComment(str);
 }
 export function toText(value: any): string {
  switch (typeof value) {
    case "string":
      return value;
    case "number":
      return String(value);
    case "boolean":
      return value ? "true" : "false";
    default:
      return value || "";
  }
 }
@@ -1,65 +0,0 @@
 import type { VNode } from "./index";
 // -----------------------------------------------------------------------------
 // Toggler node
 // -----------------------------------------------------------------------------
 class VToggler {
  key: string;
  child: VNode;
  parentEl?: HTMLElement | undefined;
  constructor(key: string, child: VNode) {
    this.key = key;
    this.child = child;
  }
  mount(parent: HTMLElement, afterNode: Node | null) {
    this.parentEl = parent;
    this.child.mount(parent, afterNode);
  }
  moveBefore(other: VToggler | null, afterNode: Node | null) {
    this.child.moveBefore(other ? other.child : null, afterNode);
  }
  patch(other: VToggler, withBeforeRemove: boolean) {
    if (this === other) {
      return;
    }
    let child1 = this.child;
    let child2 = other.child;
    if (this.key === other.key) {
      child1.patch(child2, withBeforeRemove);
    } else {
      child2.mount(this.parentEl!, child1.firstNode()!);
      if (withBeforeRemove) {
        child1.beforeRemove();
      }
      child1.remove();
      this.child = child2;
      this.key = other.key;
    }
  }
  beforeRemove() {
    this.child.beforeRemove();
  }
  remove() {
    this.child.remove();
  }
  firstNode(): Node | undefined {
    return this.child.firstNode();
  }
  toString(): string {
    return this.child.toString();
  }
 }
 export function toggler(key: string, child: VNode): VNode<VToggler> {
  return new VToggler(key, child);
 }
@@ -1,27 +0,0 @@
 import type { BDom } from "../blockdom";
 import { CodeGenerator, Config } from "./code_generator";
 import { parse } from "./parser";
 export type Template = (context: any, vnode: any, key?: string) => BDom;
 export type TemplateFunction = (blocks: any, utils: any) => Template;
 interface CompileOptions extends Config {
  name?: string;
 }
 export function compile(template: string | Node, options: CompileOptions = {}): TemplateFunction {
  // parsing
  const ast = parse(template);
  // some work
  const hasSafeContext =
    template instanceof Node
      ? !(template instanceof Element) || template.querySelector("[t-set], [t-call]") === null
      : !template.includes("t-set") && !template.includes("t-call");
  // code generation
  const codeGenerator = new CodeGenerator(ast, { ...options, hasSafeContext });
  const code = codeGenerator.generateCode();
  // template function
  return new Function("bdom, helpers", code) as TemplateFunction;
 }
@@ -1,997 +0,0 @@
 // -----------------------------------------------------------------------------
 // AST Type definition
 // -----------------------------------------------------------------------------
 export const enum ASTType {
  Text,
  Comment,
  DomNode,
  Multi,
  TEsc,
  TIf,
  TSet,
  TCall,
  TOut,
  TForEach,
  TKey,
  TComponent,
  TDebug,
  TLog,
  TSlot,
  TCallBlock,
  TTranslation,
  TPortal,
 }
 export interface ASTText {
  type: ASTType.Text;
  value: string;
 }
 export interface ASTComment {
  type: ASTType.Comment;
  value: string;
 }
 export interface ASTDomNode {
  type: ASTType.DomNode;
  tag: string;
  dynamicTag: string | null;
  attrs: { [key: string]: string };
  content: AST[];
  ref: string | null;
  on: { [key: string]: string };
  model: {
    baseExpr: string;
    expr: string;
    targetAttr: string;
    specialInitTargetAttr: string | null;
    eventType: "change" | "click" | "input";
    shouldTrim: boolean;
    shouldNumberize: boolean;
  } | null;
  ns: string | null;
 }
 export interface ASTMulti {
  type: ASTType.Multi;
  content: AST[];
  deepRemove: boolean;
 }
 export interface ASTTEsc {
  type: ASTType.TEsc;
  expr: string;
  defaultValue: string;
 }
 export interface ASTTOut {
  type: ASTType.TOut;
  expr: string;
  body: AST[] | null;
 }
 export interface ASTTif {
  type: ASTType.TIf;
  condition: string;
  content: AST;
  tElif: { condition: string; content: AST }[] | null;
  tElse: AST | null;
  deepRemove: boolean;
 }
 export interface ASTTSet {
  type: ASTType.TSet;
  name: string;
  value: string | null; // value defined in attribute
  defaultValue: string | null; // value defined in body, if text
  body: AST[] | null; // content of body if not text
 }
 export interface ASTTForEach {
  type: ASTType.TForEach;
  collection: string;
  elem: string;
  key: string | null;
  body: AST;
  memo: string;
  deepRemove: boolean;
  hasNoFirst: boolean;
  hasNoLast: boolean;
  hasNoIndex: boolean;
  hasNoValue: boolean;
 }
 export interface ASTTKey {
  type: ASTType.TKey;
  expr: string;
  content: AST;
 }
 export interface ASTTCall {
  type: ASTType.TCall;
  name: string;
  body: AST[] | null;
 }
 export interface ASTComponent {
  type: ASTType.TComponent;
  name: string;
  isDynamic: boolean;
  dynamicProps: string | null;
  props: { [name: string]: string };
  slots: { [name: string]: { content: AST; attrs?: { [key: string]: string }; scope?: string } };
 }
 export interface ASTSlot {
  type: ASTType.TSlot;
  name: string;
  attrs: { [key: string]: string };
  defaultContent: AST | null;
 }
 export interface ASTTCallBlock {
  type: ASTType.TCallBlock;
  name: string;
 }
 export interface ASTDebug {
  type: ASTType.TDebug;
  content: AST | null;
 }
 export interface ASTLog {
  type: ASTType.TLog;
  expr: string;
  content: AST | null;
 }
 export interface ASTTranslation {
  type: ASTType.TTranslation;
  content: AST | null;
 }
 export interface ASTTPortal {
  type: ASTType.TPortal;
  target: string;
  content: AST;
 }
 export type AST =
  | ASTText
  | ASTComment
  | ASTDomNode
  | ASTMulti
  | ASTTEsc
  | ASTTif
  | ASTTSet
  | ASTTCall
  | ASTTOut
  | ASTTForEach
  | ASTTKey
  | ASTComponent
  | ASTSlot
  | ASTTCallBlock
  | ASTLog
  | ASTDebug
  | ASTTranslation
  | ASTTPortal;
 // -----------------------------------------------------------------------------
 // Parser
 // -----------------------------------------------------------------------------
 interface ParsingContext {
  inPreTag: boolean;
  inSVG: boolean;
 }
 export function parse(xml: string | Node): AST {
  const node = xml instanceof Element ? xml : (parseXML(`<t>${xml}</t>`).firstChild! as Element);
  normalizeXML(node);
  const ctx = { inPreTag: false, inSVG: false };
  const ast = parseNode(node, ctx);
  if (!ast) {
    return { type: ASTType.Text, value: "" };
  }
  return ast;
 }
 function parseNode(node: ChildNode, ctx: ParsingContext): AST | null {
  if (!(node instanceof Element)) {
    return parseTextCommentNode(node, ctx);
  }
  return (
    parseTDebugLog(node, ctx) ||
    parseTForEach(node, ctx) ||
    parseTIf(node, ctx) ||
    parseTPortal(node, ctx) ||
    parseTCall(node, ctx) ||
    parseTCallBlock(node, ctx) ||
    parseTEscNode(node, ctx) ||
    parseTKey(node, ctx) ||
    parseTTranslation(node, ctx) ||
    parseTSlot(node, ctx) ||
    parseTOutNode(node, ctx) ||
    parseComponent(node, ctx) ||
    parseDOMNode(node, ctx) ||
    parseTSetNode(node, ctx) ||
    parseTNode(node, ctx)
  );
 }
 // -----------------------------------------------------------------------------
 // <t /> tag
 // -----------------------------------------------------------------------------
 function parseTNode(node: Element, ctx: ParsingContext): AST | null {
  if (node.tagName !== "t") {
    return null;
  }
  return parseChildNodes(node, ctx);
 }
 // -----------------------------------------------------------------------------
 // Text and Comment Nodes
 // -----------------------------------------------------------------------------
 const lineBreakRE = /[\r\n]/;
 const whitespaceRE = /\s+/g;
 function parseTextCommentNode(node: ChildNode, ctx: ParsingContext): AST | null {
  if (node.nodeType === Node.TEXT_NODE) {
    let value = node.textContent || "";
    if (!ctx.inPreTag) {
      if (lineBreakRE.test(value) && !value.trim()) {
        return null;
      }
      value = value.replace(whitespaceRE, " ");
    }
    return { type: ASTType.Text, value };
  } else if (node.nodeType === Node.COMMENT_NODE) {
    return { type: ASTType.Comment, value: node.textContent || "" };
  }
  return null;
 }
 // -----------------------------------------------------------------------------
 // debugging
 // -----------------------------------------------------------------------------
 function parseTDebugLog(node: Element, ctx: ParsingContext): AST | null {
  if (node.hasAttribute("t-debug")) {
    node.removeAttribute("t-debug");
    return {
      type: ASTType.TDebug,
      content: parseNode(node, ctx),
    };
  }
  if (node.hasAttribute("t-log")) {
    const expr = node.getAttribute("t-log")!;
    node.removeAttribute("t-log");
    return {
      type: ASTType.TLog,
      expr,
      content: parseNode(node, ctx),
    };
  }
  return null;
 }
 // -----------------------------------------------------------------------------
 // Regular dom node
 // -----------------------------------------------------------------------------
 const hasDotAtTheEnd = /\.[\w_]+\s*$/;
 const hasBracketsAtTheEnd = /\[[^\[]+\]\s*$/;
 function parseDOMNode(node: Element, ctx: ParsingContext): AST | null {
  const { tagName } = node;
  const dynamicTag = node.getAttribute("t-tag");
  node.removeAttribute("t-tag");
  if (tagName === "t" && !dynamicTag) {
    return null;
  }
  ctx = Object.assign({}, ctx);
  if (tagName === "pre") {
    ctx.inPreTag = true;
  }
  const shouldAddSVGNS = tagName === "svg" || (tagName === "g" && !ctx.inSVG);
  ctx.inSVG = ctx.inSVG || shouldAddSVGNS;
  const ns = shouldAddSVGNS ? "http://www.w3.org/2000/svg" : null;
  const ref = node.getAttribute("t-ref");
  node.removeAttribute("t-ref");
  const children = parseChildren(node, ctx);
  const nodeAttrsNames = node.getAttributeNames();
  const attrs: ASTDomNode["attrs"] = {};
  const on: ASTDomNode["on"] = {};
  let model: ASTDomNode["model"] = null;
  for (let attr of nodeAttrsNames) {
    const value = node.getAttribute(attr)!;
    if (attr.startsWith("t-on")) {
      if (attr === "t-on") {
        throw new Error("Missing event name with t-on directive");
      }
      on[attr.slice(5)] = value;
    } else if (attr.startsWith("t-model")) {
      if (!["input", "select", "textarea"].includes(tagName)) {
        throw new Error("The t-model directive only works with <input>, <textarea> and <select>");
      }
      let baseExpr, expr;
      if (hasDotAtTheEnd.test(value)) {
        const index = value.lastIndexOf(".");
        baseExpr = value.slice(0, index);
        expr = `'${value.slice(index + 1)}'`;
      } else if (hasBracketsAtTheEnd.test(value)) {
        const index = value.lastIndexOf("[");
        baseExpr = value.slice(0, index);
        expr = value.slice(index + 1, -1);
      } else {
        throw new Error(`Invalid t-model expression: "${value}" (it should be assignable)`);
      }
      const typeAttr = node.getAttribute("type");
      const isInput = tagName === "input";
      const isSelect = tagName === "select";
      const isTextarea = tagName === "textarea";
      const isCheckboxInput = isInput && typeAttr === "checkbox";
      const isRadioInput = isInput && typeAttr === "radio";
      const isOtherInput = isInput && !isCheckboxInput && !isRadioInput;
      const hasLazyMod = attr.includes(".lazy");
      const hasNumberMod = attr.includes(".number");
      const hasTrimMod = attr.includes(".trim");
      const eventType = isRadioInput ? "click" : isSelect || hasLazyMod ? "change" : "input";
      model = {
        baseExpr,
        expr,
        targetAttr: isCheckboxInput ? "checked" : "value",
        specialInitTargetAttr: isRadioInput ? "checked" : null,
        eventType,
        shouldTrim: hasTrimMod && (isOtherInput || isTextarea),
        shouldNumberize: hasNumberMod && (isOtherInput || isTextarea),
      };
    } else {
      if (attr.startsWith("t-") && !attr.startsWith("t-att")) {
        throw new Error(`Unknown QWeb directive: '${attr}'`);
      }
      attrs[attr] = value;
    }
  }
  return {
    type: ASTType.DomNode,
    tag: tagName,
    dynamicTag,
    attrs,
    on,
    ref,
    content: children,
    model,
    ns,
  };
 }
 // -----------------------------------------------------------------------------
 // t-esc
 // -----------------------------------------------------------------------------
 function parseTEscNode(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-esc")) {
    return null;
  }
  const escValue = node.getAttribute("t-esc")!;
  node.removeAttribute("t-esc");
  const tesc: AST = {
    type: ASTType.TEsc,
    expr: escValue,
    defaultValue: node.textContent || "",
  };
  let ref = node.getAttribute("t-ref");
  node.removeAttribute("t-ref");
  const ast = parseNode(node, ctx);
  if (!ast) {
    return tesc;
  }
  if (ast.type === ASTType.DomNode) {
    return {
      ...ast,
      ref,
      content: [tesc],
    };
  }
  if (ast.type === ASTType.TComponent) {
    throw new Error("t-esc is not supported on Component nodes");
  }
  return tesc;
 }
 // -----------------------------------------------------------------------------
 // t-out
 // -----------------------------------------------------------------------------
 function parseTOutNode(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-out") && !node.hasAttribute("t-raw")) {
    return null;
  }
  if (node.hasAttribute("t-raw")) {
    console.warn(
      `t-raw has been deprecated in favor of t-out. If the value to render is not wrapped by the "markup" function, it will be escaped`
    );
  }
  const expr = (node.getAttribute("t-out") || node.getAttribute("t-raw"))!;
  node.removeAttribute("t-out");
  node.removeAttribute("t-raw");
  const tOut: AST = { type: ASTType.TOut, expr, body: null };
  const ref = node.getAttribute("t-ref");
  node.removeAttribute("t-ref");
  const ast = parseNode(node, ctx);
  if (!ast) {
    return tOut;
  }
  if (ast.type === ASTType.DomNode) {
    tOut.body = ast.content.length ? ast.content : null;
    return {
      ...ast,
      ref,
      content: [tOut],
    };
  }
  return tOut;
 }
 // -----------------------------------------------------------------------------
 // t-foreach and t-key
 // -----------------------------------------------------------------------------
 function parseTForEach(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-foreach")) {
    return null;
  }
  const html = node.outerHTML;
  const collection = node.getAttribute("t-foreach")!;
  node.removeAttribute("t-foreach");
  const elem = node.getAttribute("t-as") || "";
  node.removeAttribute("t-as");
  const key = node.getAttribute("t-key");
  if (!key) {
    throw new Error(
      `"Directive t-foreach should always be used with a t-key!" (expression: t-foreach="${collection}" t-as="${elem}")`
    );
  }
  node.removeAttribute("t-key");
  const memo = node.getAttribute("t-memo") || "";
  node.removeAttribute("t-memo");
  const body = parseNode(node, ctx);
  if (!body) {
    return null;
  }
  const hasNoTCall = !html.includes("t-call");
  const hasNoFirst = hasNoTCall && !html.includes(`${elem}_first`);
  const hasNoLast = hasNoTCall && !html.includes(`${elem}_last`);
  const hasNoIndex = hasNoTCall && !html.includes(`${elem}_index`);
  const hasNoValue = hasNoTCall && !html.includes(`${elem}_value`);
  return {
    type: ASTType.TForEach,
    collection,
    elem,
    body,
    memo,
    deepRemove: needDeepRemove(body),
    key,
    hasNoFirst,
    hasNoLast,
    hasNoIndex,
    hasNoValue,
  };
 }
 /**
 * @returns true if we are sure that a deep remove (without optimisation) is needed, for exemple
 * if there is a portal.
 */
 function needDeepRemove(ast: AST): boolean {
  switch (ast.type) {
    case ASTType.Multi:
    case ASTType.TForEach:
    case ASTType.TIf:
      return ast.deepRemove;
    case ASTType.TPortal:
      return true;
    case ASTType.TComponent:
    case ASTType.TOut:
    case ASTType.TCall:
    case ASTType.TCallBlock:
    case ASTType.TSlot:
    case ASTType.Text:
    case ASTType.Comment:
    case ASTType.TEsc:
      return false;
    case ASTType.TKey:
      return needDeepRemove(ast.content);
    case ASTType.TDebug:
    case ASTType.TLog:
    case ASTType.TTranslation:
      return ast.content ? needDeepRemove(ast.content) : false;
    case ASTType.TSet:
      return ast.body ? ast.body.some((ast) => needDeepRemove(ast)) : false;
    case ASTType.DomNode:
      return ast.content.some((ast) => needDeepRemove(ast));
  }
 }
 function parseTKey(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-key")) {
    return null;
  }
  const key = node.getAttribute("t-key")!;
  node.removeAttribute("t-key");
  const body = parseNode(node, ctx);
  if (!body) {
    return null;
  }
  return { type: ASTType.TKey, expr: key, content: body };
 }
 // -----------------------------------------------------------------------------
 // t-call
 // -----------------------------------------------------------------------------
 function parseTCall(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-call")) {
    return null;
  }
  const subTemplate = node.getAttribute("t-call")!;
  node.removeAttribute("t-call");
  if (node.tagName !== "t") {
    const ast = parseNode(node, ctx);
    const tcall: AST = { type: ASTType.TCall, name: subTemplate, body: null };
    if (ast && ast.type === ASTType.DomNode) {
      ast.content = [tcall];
      return ast;
    }
    if (ast && ast.type === ASTType.TComponent) {
      return {
        ...ast,
        slots: { default: { content: tcall } },
      };
    }
  }
  const body = parseChildren(node, ctx);
  return {
    type: ASTType.TCall,
    name: subTemplate,
    body: body.length ? body : null,
  };
 }
 // -----------------------------------------------------------------------------
 // t-call-block
 // -----------------------------------------------------------------------------
 function parseTCallBlock(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-call-block")) {
    return null;
  }
  const name = node.getAttribute("t-call-block")!;
  return {
    type: ASTType.TCallBlock,
    name,
  };
 }
 // -----------------------------------------------------------------------------
 // t-if
 // -----------------------------------------------------------------------------
 function parseTIf(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-if")) {
    return null;
  }
  const condition = node.getAttribute("t-if")!;
  node.removeAttribute("t-if");
  const content = parseNode(node, ctx) || { type: ASTType.Text, value: "" };
  let nextElement = node.nextElementSibling;
  // t-elifs
  const tElifs: any[] = [];
  while (nextElement && nextElement.hasAttribute("t-elif")) {
    const condition = nextElement.getAttribute("t-elif");
    nextElement.removeAttribute("t-elif");
    const tElif = parseNode(nextElement, ctx);
    const next = nextElement.nextElementSibling;
    nextElement.remove();
    nextElement = next;
    if (tElif) {
      tElifs.push({ condition, content: tElif });
    }
  }
  // t-else
  let tElse: AST | null = null;
  if (nextElement && nextElement.hasAttribute("t-else")) {
    nextElement.removeAttribute("t-else");
    tElse = parseNode(nextElement, ctx);
    nextElement.remove();
  }
  let deepRemove = needDeepRemove(content);
  if (tElifs) {
    deepRemove = deepRemove || tElifs.some((ast) => needDeepRemove(ast));
  }
  if (tElse) {
    deepRemove = deepRemove || needDeepRemove(tElse);
  }
  return {
    type: ASTType.TIf,
    condition,
    content,
    tElif: tElifs.length ? tElifs : null,
    tElse,
    deepRemove,
  };
 }
 // -----------------------------------------------------------------------------
 // t-set directive
 // -----------------------------------------------------------------------------
 function parseTSetNode(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-set")) {
    return null;
  }
  const name = node.getAttribute("t-set")!;
  const value = node.getAttribute("t-value") || null;
  const defaultValue = node.innerHTML === node.textContent ? node.textContent || null : null;
  let body: AST[] | null = null;
  if (node.textContent !== node.innerHTML) {
    body = parseChildren(node, ctx);
  }
  return { type: ASTType.TSet, name, value, defaultValue, body };
 }
 // -----------------------------------------------------------------------------
 // Components
 // -----------------------------------------------------------------------------
 // Error messages when trying to use an unsupported directive on a component
 const directiveErrorMap = new Map([
  ["t-on", "t-on is no longer supported on components. Consider passing a callback in props."],
  [
    "t-ref",
    "t-ref is no longer supported on components. Consider exposing only the public part of the component's API through a callback prop.",
  ],
  ["t-att", "t-att makes no sense on component: props are already treated as expressions"],
  [
    "t-attf",
    "t-attf is not supported on components: use template strings for string interpolation in props",
  ],
 ]);
 function parseComponent(node: Element, ctx: ParsingContext): AST | null {
  let name = node.tagName;
  const firstLetter = name[0];
  let isDynamic = node.hasAttribute("t-component");
  if (isDynamic && name !== "t") {
    throw new Error(`Directive 't-component' can only be used on <t> nodes (used on a <${name}>)`);
  }
  if (!(firstLetter === firstLetter.toUpperCase() || isDynamic)) {
    return null;
  }
  if (isDynamic) {
    name = node.getAttribute("t-component")!;
    node.removeAttribute("t-component");
  }
  const dynamicProps = node.getAttribute("t-props");
  node.removeAttribute("t-props");
  const props: ASTComponent["props"] = {};
  for (let name of node.getAttributeNames()) {
    const value = node.getAttribute(name)!;
    if (name.startsWith("t-")) {
      const message = directiveErrorMap.get(name.split("-").slice(0, 2).join("-"));
      throw new Error(message || `unsupported directive on Component: ${name}`);
    } else {
      props[name] = value;
    }
  }
  const slots: ASTComponent["slots"] = {};
  if (node.hasChildNodes()) {
    const clone = <Element>node.cloneNode(true);
    // named slots
    const slotNodes = Array.from(clone.querySelectorAll("[t-set-slot]"));
    for (let slotNode of slotNodes) {
      if (slotNode.tagName !== "t") {
        throw new Error(
          `Directive 't-set-slot' can only be used on <t> nodes (used on a <${slotNode.tagName}>)`
        );
      }
      const name = slotNode.getAttribute("t-set-slot")!;
      // check if this is defined in a sub component (in which case it should
      // be ignored)
      let el = slotNode.parentElement!;
      let isInSubComponent = false;
      while (el !== clone) {
        if (el!.hasAttribute("t-component") || el!.tagName[0] === el!.tagName[0].toUpperCase()) {
          isInSubComponent = true;
          break;
        }
        el = el.parentElement!;
      }
      if (isInSubComponent) {
        continue;
      }
      slotNode.removeAttribute("t-set-slot");
      slotNode.remove();
      const slotAst = parseNode(slotNode, ctx);
      if (slotAst) {
        const slotInfo: any = { content: slotAst };
        const attrs: { [key: string]: string } = {};
        for (let attributeName of slotNode.getAttributeNames()) {
          const value = slotNode.getAttribute(attributeName)!;
          if (attributeName === "t-slot-scope") {
            slotInfo.scope = value;
            continue;
          }
          attrs[attributeName] = value;
        }
        if (Object.keys(attrs).length) {
          slotInfo.attrs = attrs;
        }
        slots[name] = slotInfo;
      }
    }
    // default slot
    const defaultContent = parseChildNodes(clone, ctx);
    if (defaultContent) {
      slots.default = { content: defaultContent };
    }
  }
  return { type: ASTType.TComponent, name, isDynamic, dynamicProps, props, slots };
 }
 // -----------------------------------------------------------------------------
 // Slots
 // -----------------------------------------------------------------------------
 function parseTSlot(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-slot")) {
    return null;
  }
  const name = node.getAttribute("t-slot")!;
  node.removeAttribute("t-slot");
  const attrs: { [key: string]: string } = {};
  for (let attributeName of node.getAttributeNames()) {
    const value = node.getAttribute(attributeName)!;
    attrs[attributeName] = value;
  }
  return {
    type: ASTType.TSlot,
    name,
    attrs,
    defaultContent: parseChildNodes(node, ctx),
  };
 }
 function parseTTranslation(node: Element, ctx: ParsingContext): AST | null {
  if (node.getAttribute("t-translation") !== "off") {
    return null;
  }
  node.removeAttribute("t-translation");
  return {
    type: ASTType.TTranslation,
    content: parseNode(node, ctx),
  };
 }
 // -----------------------------------------------------------------------------
 // Portal
 // -----------------------------------------------------------------------------
 function parseTPortal(node: Element, ctx: ParsingContext): AST | null {
  if (!node.hasAttribute("t-portal")) {
    return null;
  }
  if (node.tagName !== "t") {
    throw new Error(
      `Directive 't-portal' can only be used on <t> nodes (used on a <${node.tagName}>)`
    );
  }
  const target = node.getAttribute("t-portal")!;
  node.removeAttribute("t-portal");
  const content = parseNode(node, ctx);
  if (!content) {
    return {
      type: ASTType.Text,
      value: "",
    };
  }
  return {
    type: ASTType.TPortal,
    target,
    content,
  };
 }
 // -----------------------------------------------------------------------------
 // helpers
 // -----------------------------------------------------------------------------
 /**
 * Parse all the child nodes of a given node and return a list of ast elements
 */
 function parseChildren(node: Node, ctx: ParsingContext): AST[] {
  const children: AST[] = [];
  for (let child of node.childNodes) {
    const childAst = parseNode(child, ctx);
    if (childAst) {
      if (childAst.type === ASTType.Multi) {
        children.push(...childAst.content);
      } else {
        children.push(childAst);
      }
    }
  }
  return children;
 }
 /**
 * Parse all the child nodes of a given node and return an ast if possible.
 * In the case there are multiple children, they are wrapped in a astmulti.
 */
 function parseChildNodes(node: Node, ctx: ParsingContext): AST | null {
  const children = parseChildren(node, ctx);
  switch (children.length) {
    case 0:
      return null;
    case 1:
      return children[0];
    default:
      return {
        type: ASTType.Multi,
        content: children,
        deepRemove: children.some((ast) => needDeepRemove(ast)),
      };
  }
 }
 /**
 * Normalizes the content of an Element so that t-if/t-elif/t-else directives
 * immediately follow one another (by removing empty text nodes or comments).
 * Throws an error when a conditional branching statement is malformed. This
 * function modifies the Element in place.
 *
 * @param el the element containing the tree that should be normalized
 */
 function normalizeTIf(el: Element) {
  let tbranch = el.querySelectorAll("[t-elif], [t-else]");
  for (let i = 0, ilen = tbranch.length; i < ilen; i++) {
    let node = tbranch[i];
    let prevElem = node.previousElementSibling!;
    let pattr = (name: string) => prevElem.getAttribute(name);
    let nattr = (name: string) => +!!node.getAttribute(name);
    if (prevElem && (pattr("t-if") || pattr("t-elif"))) {
      if (pattr("t-foreach")) {
        throw new Error(
          "t-if cannot stay at the same level as t-foreach when using t-elif or t-else"
        );
      }
      if (
        ["t-if", "t-elif", "t-else"].map(nattr).reduce(function (a, b) {
          return a + b;
        }) > 1
      ) {
        throw new Error("Only one conditional branching directive is allowed per node");
      }
      // All text (with only spaces) and comment nodes (nodeType 8) between
      // branch nodes are removed
      let textNode;
      while ((textNode = node.previousSibling) !== prevElem) {
        if (textNode!.nodeValue!.trim().length && textNode!.nodeType !== 8) {
          throw new Error("text is not allowed between branching directives");
        }
        textNode!.remove();
      }
    } else {
      throw new Error(
        "t-elif and t-else directives must be preceded by a t-if or t-elif directive"
      );
    }
  }
 }
 /**
 * Normalizes the content of an Element so that t-esc directives on components
 * are removed and instead places a <t t-esc=""> as the default slot of the
 * component. Also throws if the component already has content. This function
 * modifies the Element in place.
 *
 * @param el the element containing the tree that should be normalized
 */
 function normalizeTEsc(el: Element) {
  const elements = [...el.querySelectorAll("[t-esc]")].filter(
    (el) => el.tagName[0] === el.tagName[0].toUpperCase() || el.hasAttribute("t-component")
  );
  for (const el of elements) {
    if (el.childNodes.length) {
      throw new Error("Cannot have t-esc on a component that already has content");
    }
    const value = el.getAttribute("t-esc");
    el.removeAttribute("t-esc");
    const t = el.ownerDocument.createElement("t");
    if (value != null) {
      t.setAttribute("t-esc", value);
    }
    el.appendChild(t);
  }
 }
 /**
 * Normalizes the tree inside a given element and do some preliminary validation
 * on it. This function modifies the Element in place.
 *
 * @param el the element containing the tree that should be normalized
 */
 function normalizeXML(el: Element) {
  normalizeTIf(el);
  normalizeTEsc(el);
 }
 /**
 * Parses an XML string into an XML document, throwing errors on parser errors
 * instead of returning an XML document containing the parseerror.
 *
 * @param xml the string to parse
 * @returns an XML document corresponding to the content of the string
 */
 function parseXML(xml: string): XMLDocument {
  const parser = new DOMParser();
  const doc = parser.parseFromString(xml, "text/xml");
  if (doc.getElementsByTagName("parsererror").length) {
    let msg = "Invalid XML in template.";
    const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
    if (parsererrorText) {
      msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
      const re = /\d+/g;
      const firstMatch = re.exec(parsererrorText);
      if (firstMatch) {
        const lineNumber = Number(firstMatch[0]);
        const line = xml.split("\n")[lineNumber - 1];
        const secondMatch = re.exec(parsererrorText);
        if (line && secondMatch) {
          const columnIndex = Number(secondMatch[0]) - 1;
          if (line[columnIndex]) {
            msg +=
              `\nThe error might be located at xml line ${lineNumber} column ${columnIndex}\n` +
              `${line}\n${"-".repeat(columnIndex - 1)}^`;
          }
        }
      }
    }
    throw new Error(msg);
  }
  return doc;
 }
@@ -1,27 +1,652 @@
-import type { Env } from "../app/app";
+import { Observer } from "../core/observer";
-import type { ComponentNode } from "./component_node";
+import { OwlEvent } from "../core/owl_event";
 import { CompiledTemplate, QWeb } from "../qweb/index";
 import { patch, VNode } from "../vdom/index";
 import "./directive";
 import { Fiber } from "./fiber";
 import "./props_validation";
 import { Scheduler, scheduler } from "./scheduler";
-// -----------------------------------------------------------------------------
+/**
-//  Component Class
+ * Owl Component System
-// -----------------------------------------------------------------------------
+ *
 * This file introduces a declarative and composable component system. It
 * contains:
 *
 * - the Env interface (generic type for the environment)
 * - the Internal interface (the owl specific metadata attached to a component)
 * - the Component class
 */
-export class Component {
+//------------------------------------------------------------------------------
-  static template: string = "";
+// Types/helpers
 //------------------------------------------------------------------------------
 /**
 * An Env (environment) is an object that will be (mostly) shared between all
 * components of an Owl application.  It is the location which should contain
 * the qweb instance necessary to render all components.
 *
 * Note that it is totally fine to extend the environment with application
 * specific keys/objects/whatever.  For example, a key `isMobile` (to declare
 * if we are in "mobile" mode), or a shared bus could be useful.
 */
 export interface Env {
  qweb: QWeb;
  [key: string]: any;
 }
 /**
 * This is mostly an internal detail of implementation. The Meta interface is
 * useful to typecheck and describe the internal keys used by Owl to manage the
 * component tree.
 */
 interface Internal<T extends Env, Props> {
  // each component has a unique id, useful mostly to handle parent/child
  // relationships
  readonly id: number;
  depth: number;
  vnode: VNode | null;
  pvnode: VNode | null;
  isMounted: boolean;
  isDestroyed: boolean;
  // parent and children keys are obviously useful to setup the parent-children
  // relationship.
  parent: Component<T, any> | null;
  children: { [key: number]: Component<T, any> };
  // children mapping: from templateID to componentID. templateID identifies a
  // place in a template. The t-component directive needs it to be able to get
  // the component instance back whenever the template is rerendered.
  cmap: { [key: number]: number };
  currentFiber: Fiber | null;
  // parentLastFiberId is there to help the parent component to detect, among
  // its children, those that are not used anymore and thus can be destroyed
  parentLastFiberId: number;
  // when a rendering is initiated by a parent, it may set variables in 'scope'
  // and 'vars' (typically when the component is rendered in a slot). We need to
  // store that information in case the component would be re-rendered later on.
  scope: any;
  vars: any;
  boundHandlers: { [key: number]: any };
  observer: Observer | null;
  renderFn: CompiledTemplate;
  mountedCB: Function | null;
  willUnmountCB: Function | null;
  willPatchCB: Function | null;
  patchedCB: Function | null;
  willStartCB: Function | null;
  willUpdatePropsCB: Function | null;
  classObj: { [key: string]: boolean } | null;
  refs: { [key: string]: Component<T, any> | HTMLElement | undefined } | null;
 }
 //------------------------------------------------------------------------------
 // Component
 //------------------------------------------------------------------------------
 let nextId = 1;
 export class Component<T extends Env, Props extends {}> {
  readonly __owl__: Internal<Env, Props>;
  static template?: string | null = null;
  static _template?: string | null = null;
  static current: Component<any, any> | null = null;
  static components = {};
  static props?: any;
  static defaultProps?: any;
  static env: any = {};
  // expose scheduler s.t. it can be mocked for testing purposes
  static scheduler: Scheduler = scheduler;
-  props: any;
+  /**
-  env: Env;
+   * The `el` is the root element of the component.  Note that it could be null:
-  __owl__: ComponentNode;
+   * this is the case if the component is not mounted yet, or is destroyed.
-
+   */
-  constructor(props: any, env: Env, node: ComponentNode) {
+  get el(): HTMLElement | null {
-    this.props = props;
+    return this.__owl__.vnode ? (<any>this).__owl__.vnode.elm : null;
    this.env = env;
    this.__owl__ = node;
  }
-  setup() {}
+  env: T;
  props: Props;
-  render() {
+  //--------------------------------------------------------------------------
-    this.__owl__.render();
+  // Lifecycle
  //--------------------------------------------------------------------------
  /**
   * Creates an instance of Component.
   *
   * Note that most of the time, only the root component needs to be created by
   * hand.  Other components should be created automatically by the framework (with
   * the t-component directive in a template)
   */
  constructor(parent?: Component<T, any> | null, props?: Props) {
    Component.current = this;
    let constr = this.constructor as any;
    const defaultProps = constr.defaultProps;
    if (defaultProps) {
      props = props || ({} as Props);
      this.__applyDefaultProps(props, defaultProps);
    }
    this.props = <Props>props;
    if (QWeb.dev) {
      QWeb.utils.validateProps(constr, this.props);
    }
    const id: number = nextId++;
    let depth;
    if (parent) {
      this.env = parent.env;
      const __powl__ = parent.__owl__;
      __powl__.children[id] = this;
      depth = __powl__.depth + 1;
    } else {
      // we are the root component
      this.env = (this.constructor as any).env;
      if (!this.env.qweb) {
        this.env.qweb = new QWeb();
      }
      this.env.qweb.on("update", this, () => {
        if (this.__owl__.isMounted) {
          this.render(true);
        }
        if (this.__owl__.isDestroyed) {
          // this is unlikely to happen, but if a root widget is destroyed,
          // we want to remove our subscription.  The usual way to do that
          // would be to perform some check in the destroy method, but since
          // it is very performance sensitive, and since this is a rare event,
          // we simply do it lazily
          this.env.qweb.off("update", this);
        }
      });
      depth = 0;
    }
    const qweb = this.env.qweb;
    const template = constr.template || this.__getTemplate(qweb);
    this.__owl__ = {
      id: id,
      depth: depth,
      vnode: null,
      pvnode: null,
      isMounted: false,
      isDestroyed: false,
      parent: parent || null,
      children: {},
      cmap: {},
      currentFiber: null,
      parentLastFiberId: 0,
      boundHandlers: {},
      mountedCB: null,
      willUnmountCB: null,
      willPatchCB: null,
      patchedCB: null,
      willStartCB: null,
      willUpdatePropsCB: null,
      observer: null,
      renderFn: qweb.render.bind(qweb, template),
      classObj: null,
      refs: null,
      scope: null,
      vars: null
    };
  }
  /**
   * willStart is an asynchronous hook that can be implemented to perform some
   * action before the initial rendering of a component.
   *
   * It will be called exactly once before the initial rendering. It is useful
   * in some cases, for example, to load external assets (such as a JS library)
   * before the component is rendered.
   *
   * Note that a slow willStart method will slow down the rendering of the user
   * interface.  Therefore, some effort should be made to make this method as
   * fast as possible.
   *
   * Note: this method should not be called manually.
   */
  async willStart() {}
  /**
   * mounted is a hook that is called each time a component is attached to the
   * DOM. This is a good place to add some listeners, or to interact with the
   * DOM, if the component needs to perform some measure for example.
   *
   * Note: this method should not be called manually.
   *
   * @see willUnmount
   */
  mounted() {}
  /**
   * The willUpdateProps is an asynchronous hook, called just before new props
   * are set. This is useful if the component needs some asynchronous task
   * performed, depending on the props (for example, assuming that the props are
   * some record Id, fetching the record data).
   *
   * This hook is not called during the first render (but willStart is called
   * and performs a similar job).
   */
  async willUpdateProps(nextProps: Props) {}
  /**
   * The willPatch hook is called just before the DOM patching process starts.
   * It is not called on the initial render.  This is useful to get some
   * information which are in the DOM.  For example, the current position of the
   * scrollbar
   */
  willPatch(): any {}
  /**
   * This hook is called whenever a component did actually update its props,
   * state or env.
   *
   * This method is not called on the initial render. It is useful to interact
   * with the DOM (for example, through an external library) whenever the
   * component was updated.
   *
   * Updating the component state in this hook is possible, but not encouraged.
   * One need to be careful, because updates here will cause rerender, which in
   * turn will cause other calls to updated. So, we need to be particularly
   * careful at avoiding endless cycles.
   */
  patched() {}
  /**
   * willUnmount is a hook that is called each time just before a component is
   * unmounted from the DOM. This is a good place to remove some listeners, for
   * example.
   *
   * Note: this method should not be called manually.
   *
   * @see mounted
   */
  willUnmount() {}
  /**
   * catchError is a method called whenever some error happens in the rendering or
   * lifecycle hooks of a child.
   *
   * It needs to be implemented by a component that is designed to handle the
   * error properly.
   */
  catchError?(error?: Error): void;
  //--------------------------------------------------------------------------
  // Public
  //--------------------------------------------------------------------------
  /**
   * Mount the component to a target element.
   *
   * This should only be done if the component was created manually. Components
   * created declaratively in templates are managed by the Owl system.
   *
   * Note that a component can be mounted an unmounted several times
   */
  async mount(target: HTMLElement | DocumentFragment): Promise<void> {
    const __owl__ = this.__owl__;
    if (__owl__.isMounted) {
      return Promise.resolve();
    }
    if (!(target instanceof HTMLElement || target instanceof DocumentFragment)) {
      let message = `Component '${this.constructor.name}' cannot be mounted: the target is not a valid DOM node.`;
      message += `\nMaybe the DOM is not ready yet? (in that case, you can use owl.utils.whenReady)`;
      throw new Error(message);
    }
    const fiber = new Fiber(null, this, false, target);
    fiber.shouldPatch = false;
    if (!__owl__.vnode) {
      this.__prepareAndRender(fiber);
    } else {
      this.__render(fiber);
    }
    return scheduler.addFiber(fiber);
  }
  /**
   * The unmount method is the opposite of the mount method.  It is useful
   * to call willUnmount calls and remove the component from the DOM.
   */
  unmount() {
    if (this.__owl__.isMounted) {
      this.__callWillUnmount();
      this.el!.remove();
    }
  }
  /**
   * The render method is the main entry point to render a component (once it
   * is ready. This method is not initially called when the component is
   * rendered the first time).
   *
   * This method will cause all its sub components to potentially rerender
   * themselves.  Note that `render` is not called if a component is updated via
   * its props.
   */
  async render(force: boolean = false): Promise<void> {
    const __owl__ = this.__owl__;
    if (!__owl__.isMounted && !__owl__.currentFiber) {
      // if we get here, this means that the component was either never mounted,
      // or was unmounted and some state change  triggered a render. Either way,
      // we do not want to actually render anything in this case.
      return;
    }
    if (__owl__.currentFiber && !__owl__.currentFiber.isRendered) {
      return scheduler.addFiber(__owl__.currentFiber.root);
    }
    // if we aren't mounted at this point, it implies that there is a
    // currentFiber that is already rendered (isRendered is true), so we are
    // about to be mounted
    const isMounted = __owl__.isMounted;
    const fiber = new Fiber(null, this, force, null);
    Promise.resolve().then(() => {
      if (__owl__.isMounted || !isMounted) {
        // we are mounted (__owl__.isMounted), or if we are currently being
        // mounted (!isMounted), so we call __render
        this.__render(fiber);
      } else {
        // we were mounted when render was called, but we aren't anymore, so we
        // were actually about to be unmounted ; we can thus forget about this
        // fiber
        fiber.isCompleted = true;
        __owl__.currentFiber = null;
      }
    });
    return scheduler.addFiber(fiber);
  }
  /**
   * Destroy the component.  This operation is quite complex:
   *  - it recursively destroy all children
   *  - call the willUnmount hooks if necessary
   *  - remove the dom node from the dom
   *
   * This should only be called manually if you created the component.  Most
   * components will be automatically destroyed.
   */
  destroy() {
    const __owl__ = this.__owl__;
    if (!__owl__.isDestroyed) {
      const el = this.el;
      this.__destroy(__owl__.parent);
      if (el) {
        el.remove();
      }
    }
  }
  /**
   * This method is called by the component system whenever its props are
   * updated. If it returns true, then the component will be rendered.
   * Otherwise, it will skip the rendering (also, its props will not be updated)
   */
  shouldUpdate(nextProps: Props): boolean {
    return true;
  }
  /**
   * Emit a custom event of type 'eventType' with the given 'payload' on the
   * component's el, if it exists. However, note that the event will only bubble
   * up to the parent DOM nodes. Thus, it must be called between mounted() and
   * willUnmount().
   */
  trigger(eventType: string, payload?: any) {
    if (this.el) {
      const ev = new OwlEvent(this, eventType, {
        bubbles: true,
        cancelable: true,
        detail: payload
      });
      this.el.dispatchEvent(ev);
    }
  }
  //--------------------------------------------------------------------------
  // Private
  //--------------------------------------------------------------------------
  /**
   * Private helper to perform a full destroy, from the point of view of an Owl
   * component. It does not remove the el (this is done only once on the top
   * level destroyed component, for performance reasons).
   *
   * The job of this method is mostly to call willUnmount hooks, and to perform
   * all necessary internal cleanup.
   *
   * Note that it does not call the __callWillUnmount method to avoid visiting
   * all children many times.
   */
  __destroy(parent: Component<any, any> | null) {
    const __owl__ = this.__owl__;
    const isMounted = __owl__.isMounted;
    if (isMounted) {
      if (__owl__.willUnmountCB) {
        __owl__.willUnmountCB();
      }
      this.willUnmount();
      __owl__.isMounted = false;
    }
    const children = __owl__.children;
    for (let key in children) {
      children[key].__destroy(this);
    }
    if (parent) {
      let id = __owl__.id;
      delete parent.__owl__.children[id];
      __owl__.parent = null;
    }
    __owl__.isDestroyed = true;
    delete __owl__.vnode;
    if (__owl__.currentFiber) {
      __owl__.currentFiber.isCompleted = true;
    }
  }
  __callMounted() {
    const __owl__ = this.__owl__;
    __owl__.isMounted = true;
    __owl__.currentFiber = null;
    this.mounted();
    if (__owl__.mountedCB) {
      __owl__.mountedCB();
    }
  }
  __callWillUnmount() {
    const __owl__ = this.__owl__;
    if (__owl__.willUnmountCB) {
      __owl__.willUnmountCB();
    }
    this.willUnmount();
    __owl__.isMounted = false;
    if (this.__owl__.currentFiber) {
      this.__owl__.currentFiber.isCompleted = true;
      this.__owl__.currentFiber.root.counter = 0;
    }
    const children = __owl__.children;
    for (let id in children) {
      const comp = children[id];
      if (comp.__owl__.isMounted) {
        comp.__callWillUnmount();
      }
    }
  }
  /**
   * The __updateProps method is called by the t-component directive whenever
   * it updates a component (so, when the parent template is rerendered).
   */
  async __updateProps(nextProps: Props, parentFiber: Fiber, scope: any, vars: any): Promise<void> {
    this.__owl__.scope = scope;
    this.__owl__.vars = vars;
    const shouldUpdate = parentFiber.force || this.shouldUpdate(nextProps);
    if (shouldUpdate) {
      const __owl__ = this.__owl__;
      const fiber = new Fiber(parentFiber, this, parentFiber.force, null);
      if (!parentFiber.child) {
        parentFiber.child = fiber;
      } else {
        parentFiber.lastChild!.sibling = fiber;
      }
      parentFiber.lastChild = fiber;
      const defaultProps = (<any>this.constructor).defaultProps;
      if (defaultProps) {
        this.__applyDefaultProps(nextProps, defaultProps);
      }
      if (QWeb.dev) {
        QWeb.utils.validateProps(this.constructor, nextProps);
      }
      await Promise.all([
        this.willUpdateProps(nextProps),
        __owl__.willUpdatePropsCB && __owl__.willUpdatePropsCB(nextProps)
      ]);
      if (fiber.isCompleted) {
        return;
      }
      this.props = nextProps;
      this.__render(fiber);
    }
  }
  /**
   * Main patching method. We call the virtual dom patch method here to convert
   * a virtual dom vnode into some actual dom.
   */
  __patch(vnode: VNode) {
    const __owl__ = this.__owl__;
    const target = __owl__.vnode || document.createElement(vnode.sel!);
    __owl__.vnode = patch(target, vnode);
  }
  /**
   * The __prepare method is only called by the t-component directive, when a
   * subcomponent is created. It gets its scope and vars, if any, from the
   * parent template.
   */
  __prepare(parentFiber: Fiber, scope: any, vars: any) {
    this.__owl__.scope = scope;
    this.__owl__.vars = vars;
    const fiber = new Fiber(parentFiber, this, parentFiber.force, null);
    fiber.shouldPatch = false;
    if (!parentFiber.child) {
      parentFiber.child = fiber;
    } else {
      parentFiber.lastChild!.sibling = fiber;
    }
    parentFiber.lastChild = fiber;
    return this.__prepareAndRender(fiber);
  }
  __getTemplate(qweb: QWeb): string {
    let p = (<any>this).constructor;
    if (!p.hasOwnProperty("_template")) {
      // here, the component and none of its superclasses defines a static `template`
      // key. So we fall back on looking for a template matching its name (or
      // one of its subclass).
      let template: string;
      while ((template = p.name) && !(template in qweb.templates) && p !== Component) {
        p = p.__proto__;
      }
      if (p === Component) {
        throw new Error(`Could not find template for component "${this.constructor.name}"`);
      } else {
        p._template = template;
      }
    }
    return p._template;
  }
  async __prepareAndRender(fiber: Fiber) {
    try {
      await Promise.all([this.willStart(), this.__owl__.willStartCB && this.__owl__.willStartCB()]);
    } catch (e) {
      fiber.handleError(e);
      return Promise.resolve();
    }
    if (this.__owl__.isDestroyed) {
      return Promise.resolve();
    }
    if (!fiber.isCompleted) {
      this.__render(fiber);
    }
  }
  __render(fiber: Fiber) {
    const __owl__ = this.__owl__;
    if (__owl__.observer) {
      __owl__.observer.allowMutations = false;
    }
    let error;
    try {
      let vnode = __owl__.renderFn!(this, {
        handlers: __owl__.boundHandlers,
        fiber: fiber
      });
      // we iterate over the children to detect those that no longer belong to the
      // current rendering: those ones, if not mounted yet, can (and have to) be
      // destroyed right now, because they are not in the DOM, and thus we won't
      // be notified later on (when patching), that they are removed from the DOM
      for (let childKey in __owl__.children) {
        let child = __owl__.children[childKey];
        if (!child.__owl__.isMounted && child.__owl__.parentLastFiberId < fiber.id) {
          child.destroy();
        }
      }
      if (!vnode) {
        throw new Error(`Rendering '${this.constructor.name}' did not return anything`);
      }
      fiber.vnode = vnode;
      // we apply here the class information described on the component by the
      // template (so, something like <MyComponent class="..."/>) to the actual
      // root vnode
      if (__owl__.classObj) {
        const data = vnode.data!;
        data.class = Object.assign(data.class || {}, __owl__.classObj);
      }
    } catch (e) {
      error = e;
    }
    if (__owl__.observer) {
      __owl__.observer.allowMutations = true;
    }
    fiber.root.counter--;
    fiber.isRendered = true;
    if (error) {
      fiber.handleError(error);
    }
  }
  /**
   * Only called by qweb t-component directive (when t-keepalive is set)
   */
  __remount() {
    const __owl__ = this.__owl__;
    if (!__owl__.isMounted) {
      __owl__.isMounted = true;
      this.mounted();
    }
  }
  /**
   * Apply default props (only top level).
   *
   * Note that this method does modify in place the props
   */
  __applyDefaultProps(props: Object, defaultProps: Object) {
    for (let propName in defaultProps) {
      if (props![propName] === undefined) {
        props![propName] = defaultProps[propName];
      }
    }
  }
 }
@@ -1,310 +0,0 @@
 import type { App, Env } from "../app/app";
 import { BDom, VNode } from "../blockdom";
 import { Component } from "./component";
 import {
  Fiber,
  makeChildFiber,
  makeRootFiber,
  MountFiber,
  MountOptions,
  RootFiber,
 } from "./fibers";
 import { handleError, fibersInError } from "./error_handling";
 import { applyDefaultProps } from "./props_validation";
 import { STATUS } from "./status";
 let currentNode: ComponentNode | null = null;
 export function getCurrent(): ComponentNode | null {
  return currentNode;
 }
 export function useComponent(): Component {
  return currentNode!.component;
 }
 export function component(
  name: string | typeof Component,
  props: any,
  key: string,
  ctx: ComponentNode,
  parent: any
 ): ComponentNode {
  let node: any = ctx.children[key];
  let isDynamic = typeof name !== "string";
  if (node) {
    if (node.status < STATUS.MOUNTED) {
      node.destroy();
      node = undefined;
    } else if (node.status === STATUS.DESTROYED) {
      node = undefined;
    }
  }
  if (isDynamic && node && node.component.constructor !== name) {
    node = undefined;
  }
  const parentFiber = ctx.fiber!;
  if (node) {
    node.updateAndRender(props, parentFiber);
  } else {
    // new component
    let C;
    if (isDynamic) {
      C = name;
    } else {
      C = parent.constructor.components[name as any];
      if (!C) {
        throw new Error(`Cannot find the definition of component "${name}"`);
      }
    }
    node = new ComponentNode(C, props, ctx.app, ctx);
    ctx.children[key] = node;
    const fiber = makeChildFiber(node, parentFiber);
    node.initiateRender(fiber);
  }
  return node;
 }
 // -----------------------------------------------------------------------------
 //  Component VNode
 // -----------------------------------------------------------------------------
 type LifecycleHook = Function;
 export class ComponentNode<T extends typeof Component = typeof Component>
  implements VNode<ComponentNode>
 {
  el?: HTMLElement | Text | undefined;
  app: App;
  fiber: Fiber | null = null;
  component: InstanceType<T>;
  bdom: BDom | null = null;
  status: STATUS = STATUS.NEW;
  renderFn: Function;
  parent: ComponentNode | null;
  level: number;
  childEnv: Env;
  children: { [key: string]: ComponentNode } = Object.create(null);
  refs: any = {};
  willStart: LifecycleHook[] = [];
  willUpdateProps: LifecycleHook[] = [];
  willUnmount: LifecycleHook[] = [];
  mounted: LifecycleHook[] = [];
  willPatch: LifecycleHook[] = [];
  patched: LifecycleHook[] = [];
  willDestroy: LifecycleHook[] = [];
  constructor(C: T, props: any, app: App, parent?: ComponentNode) {
    currentNode = this;
    this.app = app;
    this.parent = parent || null;
    this.level = parent ? parent.level + 1 : 0;
    applyDefaultProps(props, C);
    const env = (parent && parent.childEnv) || app.env;
    this.childEnv = env;
    this.component = new C(props, env, this) as any;
    this.renderFn = app.getTemplate(C.template).bind(this.component, this.component, this);
    this.component.setup();
  }
  mountComponent(target: any, options?: MountOptions) {
    const fiber = new MountFiber(this, target, options);
    this.app.scheduler.addFiber(fiber);
    this.initiateRender(fiber);
  }
  async initiateRender(fiber: Fiber | MountFiber) {
    this.fiber = fiber;
    if (this.mounted.length) {
      fiber.root.mounted.push(fiber);
    }
    const component = this.component;
    try {
      await Promise.all(this.willStart.map((f) => f.call(component)));
    } catch (e) {
      handleError({ node: this, error: e });
      return;
    }
    if (this.status === STATUS.NEW && this.fiber === fiber) {
      this._render(fiber);
    }
  }
  async render() {
    let current = this.fiber;
    if (current && current.root.locked) {
      await Promise.resolve();
      // situation may have changed after the microtask tick
      current = this.fiber;
    }
    if (current && !current.bdom && !fibersInError.has(current)) {
      return;
    }
    if (!this.bdom && !current) {
      return;
    }
    const fiber = makeRootFiber(this);
    this.fiber = fiber;
    this.app.scheduler.addFiber(fiber);
    await Promise.resolve();
    if (this.status === STATUS.DESTROYED) {
      return;
    }
    // We only want to actually render the component if the following two
    // conditions are true:
    // * this.fiber: it could be null, in which case the render has been cancelled
    // * (current || !fiber.parent): if current is not null, this means that the
    //   render function was called when a render was already occurring. In this
    //   case, the pending rendering was cancelled, and the fiber needs to be
    //   rendered to complete the work.  If current is null, we check that the
    //   fiber has no parent.  If that is the case, the fiber was downgraded from
    //   a root fiber to a child fiber in the previous microtick, because it was
    //   embedded in a rendering coming from above, so the fiber will be rendered
    //   in the next microtick anyway, so we should not render it again.
    if (this.fiber && (current || !fiber.parent)) {
      this._render(fiber);
    }
  }
  _render(fiber: Fiber | RootFiber) {
    try {
      fiber.bdom = this.renderFn();
      fiber.root.counter--;
    } catch (e) {
      handleError({ node: this, error: e });
    }
  }
  destroy() {
    let shouldRemove = this.status === STATUS.MOUNTED;
    this._destroy();
    if (shouldRemove) {
      this.bdom!.remove();
    }
  }
  _destroy() {
    const component = this.component;
    if (this.status === STATUS.MOUNTED) {
      for (let cb of this.willUnmount) {
        cb.call(component);
      }
    }
    for (let child of Object.values(this.children)) {
      child._destroy();
    }
    for (let cb of this.willDestroy) {
      cb.call(component);
    }
    this.status = STATUS.DESTROYED;
  }
  async updateAndRender(props: any, parentFiber: Fiber) {
    // update
    const fiber = makeChildFiber(this, parentFiber);
    this.fiber = fiber;
    const component = this.component;
    applyDefaultProps(props, component.constructor as any);
    const prom = Promise.all(this.willUpdateProps.map((f) => f.call(component, props)));
    await prom;
    if (fiber !== this.fiber) {
      return;
    }
    component.props = props;
    this._render(fiber);
    const parentRoot = parentFiber.root;
    if (this.willPatch.length) {
      parentRoot.willPatch.push(fiber);
    }
    if (this.patched.length) {
      parentRoot.patched.push(fiber);
    }
  }
  /**
   * Finds a child that has dom that is not yet updated, and update it. This
   * method is meant to be used only in the context of repatching the dom after
   * a mounted hook failed and was handled.
   */
  updateDom() {
    if (!this.fiber) {
      return;
    }
    if (this.bdom === this.fiber!.bdom) {
      // If the error was handled by some child component, we need to find it to
      // apply its change
      for (let k in this.children) {
        const child = this.children[k];
        child.updateDom();
      }
    } else {
      // if we get here, this is the component that handled the error and rerendered
      // itself, so we can simply patch the dom
      this.bdom!.patch(this.fiber!.bdom, false);
      this.fiber!.appliedToDom = true;
      this.fiber = null;
    }
  }
  // ---------------------------------------------------------------------------
  // Block DOM methods
  // ---------------------------------------------------------------------------
  firstNode(): Node | undefined {
    const bdom = this.bdom;
    return bdom ? bdom.firstNode() : undefined;
  }
  mount(parent: HTMLElement, anchor: ChildNode) {
    const bdom = this.fiber!.bdom!;
    this.bdom = bdom;
    bdom.mount(parent, anchor);
    this.status = STATUS.MOUNTED;
    this.fiber!.appliedToDom = true;
    this.fiber = null;
  }
  moveBefore(other: ComponentNode | null, afterNode: Node | null) {
    this.bdom!.moveBefore(other ? other.bdom : null, afterNode);
  }
  patch() {
    this.bdom!.patch(this!.fiber!.bdom!, false);
    this.cleanOutdatedChildren();
    this.fiber!.appliedToDom = true;
    this.fiber = null;
  }
  beforeRemove() {
    console.log('ddddddd')
    this._destroy();
  }
  remove() {
    console.log('coucou')
    this.bdom!.remove();
  }
  cleanOutdatedChildren() {
    const childrenEntries = Object.entries(this.children);
    if (!childrenEntries.length) {
      return;
    }
    const children = this.children;
    for (const [key, node] of childrenEntries) {
      const status = node.status;
      if (status !== STATUS.MOUNTED) {
        delete children[key];
        if (status !== STATUS.DESTROYED) {
          node.destroy();
        }
      }
    }
  }
 }
@@ -0,0 +1,470 @@
 import { QWeb } from "../qweb/index";
 import { INTERP_REGEXP } from "../qweb/compilation_context";
 import { MODS_CODE } from "../qweb/extensions";
 //------------------------------------------------------------------------------
 // t-component
 //------------------------------------------------------------------------------
 const T_COMPONENT_MODS_CODE = Object.assign({}, MODS_CODE, {
  self: "if (e.target !== vn.elm) {return}"
 });
 QWeb.utils.defineProxy = function defineProxy(target, source) {
  for (let k in source) {
    Object.defineProperty(target, k, {
      get() {
        return source[k];
      },
      set(val) {
        source[k] = val;
      }
    });
  }
 };
 /**
 * The t-component directive is certainly a complicated and hard to maintain piece
 * of code.  To help you, fellow developer, if you have to maintain it, I offer
 * you this advice: Good luck...
 *
 * Since it is not 'direct' code, but rather code that generates other code, it
 * is not easy to understand.  To help you, here  is a detailed and commented
 * explanation of the code generated by the t-component directive for the following
 * situation:
 * ```xml
 *   <Child
 *      t-key="'somestring'"
 *      flag="state.flag"
 *      t-transition="fade"/>
 * ```
 *
 * ```js
 * // we assign utils on top of the function because it will be useful for
 * // each components
 * let utils = this.utils;
 *
 * // this is the virtual node representing the parent div
 * let c1 = [], p1 = { key: 1 };
 * var vn1 = h("div", p1, c1);
 *
 * // t-component directive: we start by evaluating the expression given by t-key:
 * let key5 = "somestring";
 *
 * // def3 is the promise that will contain later either the new component
 * // creation, or the props update...
 * let def3;
 *
 * // this is kind of tricky: we need here to find if the component was already
 * // created by a previous rendering.  This is done by checking the internal
 * // `cmap` (children map) of the parent component: it maps keys to component ids,
 * // and, then, if there is an id, we look into the children list to get the
 * // instance
 * let w4 =
 *   key5 in context.__owl__.cmap
 *   ? context.__owl__.children[context.__owl__.cmap[key5]]
 *   : false;
 *
 * // We keep the index of the position of the component in the closure.  We push
 * // null to reserve the slot, and will replace it later by the component vnode,
 * // when it will be ready (do not forget that preparing/rendering a component is
 * // asynchronous)
 * let _2_index = c1.length;
 * c1.push(null);
 *
 * // we evaluate here the props given to the component. It is done here to be
 * // able to easily reference it later, and also, it might be an expensive
 * // computation, so it is certainly better to do it only once
 * let props4 = { flag: context["state"].flag };
 *
 * // If we have a component, currently rendering, but not ready yet, we do not want
 * // to wait for it to be ready if we can avoid it
 * if (w4 && w4.__owl__.renderPromise && !w4.__owl__.vnode) {
 *   // we check if the props are the same.  In that case, we can simply reuse
 *   // the previous rendering and skip all useless work
 *   if (utils.shallowEqual(props4, w4.__owl__.renderProps)) {
 *     def3 = w4.__owl__.renderPromise;
 *   } else {
 *     // if the props are not the same, we destroy the component and starts anew.
 *     // this will be faster than waiting for its rendering, then updating it
 *     w4.destroy();
 *     w4 = false;
 *   }
 * }
 *
 * if (!w4) {
 *   // in this situation, we need to create a new component.  First step is
 *   // to get a reference to the class, then create an instance with
 *   // current context as parent, and the props.
 *   let W4 = context.component && context.components[componentKey4] || QWeb.component[componentKey4];
 *   if (!W4) {
 *     throw new Error("Cannot find the definition of component 'child'");
 *   }
 *   w4 = new W4(owner, props4);
 *
 *   // Whenever we rerender the parent component, we need to be sure that we
 *   // are able to find the component instance. To do that, we register it to
 *   // the parent cmap (children map).  Note that the 'template' key is
 *   // used here, since this is what identify the component from the template
 *   // perspective.
 *   context.__owl__.cmap[key5] = w4.__owl__.id;
 *
 *   // __prepare is called, to basically call willStart, then render the
 *   // component
 *   def3 = w4.__prepare();
 *
 *   def3 = def3.then(vnode => {
 *     // we create here a virtual node for the parent (NOT the component). This
 *     // means that the vdom of the parent will be stopped here, and from
 *     // the parent's perspective, it simply is a vnode with no children.
 *     // However, it shares the same dom element with the component root
 *     // vnode.
 *     let pvnode = h(vnode.sel, { key: key5 });
 *
 *     // we add hooks to the parent vnode so we can interact with the new
 *     // component at the proper time
 *     pvnode.data.hook = {
 *       insert(vn) {
 *         // the __mount method will patch the component vdom into the elm vn.elm,
 *         // then call the mounted hooks. However, suprisingly, the snabbdom
 *         // patch method actually replace the elm by a new elm, so we need
 *         // to synchronise the pvnode elm with the resulting elm
 *         let nvn = w4.__mount(vnode, vn.elm);
 *         pvnode.elm = nvn.elm;
 *         // what follows is only present if there are animations on the component
 *         utils.transitionInsert(vn, "fade");
 *       },
 *       remove() {
 *         // override with empty function to prevent from removing the node
 *         // directly. It will be removed when destroy is called anyway, which
 *         // delays the removal if there are animations.
 *       },
 *       destroy() {
 *         // if there are animations, we delay the call to destroy on the
 *         // component, if not, we call it directly.
 *         let finalize = () => {
 *           w4.destroy();
 *         };
 *         utils.transitionRemove(vn, "fade", finalize);
 *       }
 *     };
 *     // the pvnode is inserted at the correct position in the div's children
 *     c1[_2_index] = pvnode;
 *
 *     // we keep here a reference to the parent vnode (representing the
 *     // component, so we can reuse it later whenever we update the component
 *     w4.__owl__.pvnode = pvnode;
 *   });
 * } else {
 *   // this is the 'update' path of the directive.
 *   // the call to __updateProps is the actual component update
 *   // Note that we only update the props if we cannot reuse the previous
 *   // rendering work (in the case it was rendered with the same props)
 *   def3 = def3 || w4.__updateProps(props4, extra.forceUpdate, extra.patchQueue);
 *   def3 = def3.then(() => {
 *     // if component was destroyed in the meantime, we do nothing (so, this
 *     // means that the parent's element children list will have a null in
 *     // the component's position, which will cause the pvnode to be removed
 *     // when it is patched.
 *     if (w4.__owl__.isDestroyed) {
 *       return;
 *     }
 *     // like above, we register the pvnode to the children list, so it
 *     // will not be patched out of the dom.
 *     let pvnode = w4.__owl__.pvnode;
 *     c1[_2_index] = pvnode;
 *   });
 * }
 *
 * // we register the deferred here so the parent can coordinate its patch operation
 * // with all the children.
 * extra.promises.push(def3);
 * return vn1;
 * ```
 */
 QWeb.addDirective({
  name: "component",
  extraNames: ["props"],
  priority: 100,
  atNodeEncounter({ ctx, value, node, qweb }): boolean {
    ctx.addLine("//COMPONENT");
    ctx.rootContext.shouldDefineOwner = true;
    ctx.rootContext.shouldDefineQWeb = true;
    ctx.rootContext.shouldDefineParent = true;
    ctx.rootContext.shouldDefineUtils = true;
    let hasDynamicProps = node.getAttribute("t-props") ? true : false;
    // t-on- events and t-transition
    const events: [string, string[], string, string][] = [];
    let transition: string = "";
    const attributes = (<Element>node).attributes;
    const props: { [key: string]: string } = {};
    for (let i = 0; i < attributes.length; i++) {
      const name = attributes[i].name;
      const value = attributes[i].textContent!;
      if (name.startsWith("t-on-")) {
        const [eventName, ...mods] = name.slice(5).split(".");
        let extraArgs;
        let handlerValue = value.replace(/\(.*\)/, function(args) {
          extraArgs = args.slice(1, -1);
          return "";
        });
        events.push([eventName, mods, handlerValue, extraArgs]);
      } else if (name === "t-transition") {
        transition = value;
      } else if (!name.startsWith("t-")) {
        if (name !== "class" && name !== "style") {
          // this is a prop!
          props[name] = ctx.formatExpression(value);
        }
      }
    }
    // computing the props string representing the props object
    let propStr = Object.keys(props)
      .map(k => k + ":" + props[k])
      .join(",");
    let defID = ctx.generateID();
    let componentID = ctx.generateID();
    const templateKey = ctx.generateTemplateKey();
    let ref = node.getAttribute("t-ref");
    let refExpr = "";
    let refKey: string = "";
    if (ref) {
      ctx.rootContext.shouldDefineRefs = true;
      refKey = `ref${ctx.generateID()}`;
      ctx.addLine(`const ${refKey} = ${ctx.interpolate(ref)};`);
      refExpr = `context.__owl__.refs[${refKey}] = w${componentID};`;
    }
    let finalizeComponentCode = `w${componentID}.destroy();`;
    if (ref) {
      finalizeComponentCode += `delete context.__owl__.refs[${refKey}];`;
    }
    if (transition) {
      finalizeComponentCode = `let finalize = () => {
          ${finalizeComponentCode}
        };
        delete w${componentID}.__owl__.transitionInserted;
        utils.transitionRemove(vn, '${transition}', finalize);`;
    }
    let createHook = "";
    let classAttr = node.getAttribute("class");
    let tattClass = node.getAttribute("t-att-class");
    let styleAttr = node.getAttribute("style");
    let tattStyle = node.getAttribute("t-att-style");
    if (tattStyle) {
      const attVar = `_${ctx.generateID()}`;
      ctx.addLine(`const ${attVar} = ${ctx.formatExpression(tattStyle)};`);
      tattStyle = attVar;
    }
    let classObj = "";
    if (classAttr || tattClass || styleAttr || tattStyle || events.length) {
      if (classAttr) {
        let classDef = classAttr
          .trim()
          .split(/\s+/)
          .map(a => `'${a}':true`)
          .join(",");
        classObj = `_${ctx.generateID()}`;
        ctx.addLine(`let ${classObj} = {${classDef}};`);
      }
      if (tattClass) {
        let tattExpr = ctx.formatExpression(tattClass);
        if (tattExpr[0] !== "{" || tattExpr[tattExpr.length - 1] !== "}") {
          tattExpr = `utils.toObj(${tattExpr})`;
        }
        if (classAttr) {
          ctx.addLine(`Object.assign(${classObj}, ${tattExpr})`);
        } else {
          classObj = `_${ctx.generateID()}`;
          ctx.addLine(`let ${classObj} = ${tattExpr};`);
        }
      }
      let eventsCode = events
        .map(function([eventName, mods, handlerValue, extraArgs]) {
          let params = "owner";
          if (extraArgs) {
            if (ctx.loopNumber) {
              let argId = ctx.generateID();
              // we need to evaluate the arguments now, because the handler will
              // be set asynchronously later when the widget is ready, and the
              // context might be different.
              ctx.addLine(`let arg${argId} = ${ctx.formatExpression(extraArgs)};`);
              params = `owner, arg${argId}`;
            } else {
              params = `owner, ${ctx.formatExpression(extraArgs)}`;
            }
          }
          let handler = `function (e) {`;
          handler += mods
            .map(function(mod) {
              return T_COMPONENT_MODS_CODE[mod];
            })
            .join("");
          if (handlerValue) {
            handler += `const fn = owner['${handlerValue}'];`;
            handler += `if (fn) { fn.call(${params}, e); } else { owner.${handlerValue}; }`;
          }
          handler += `}`;
          return `vn.elm.addEventListener('${eventName}', ${handler});`;
        })
        .join("");
      const styleExpr = tattStyle || (styleAttr ? `'${styleAttr}'` : false);
      const styleCode = styleExpr ? `vn.elm.style = ${styleExpr};` : "";
      createHook = `vnode.data.hook = {create(_, vn){${styleCode}${eventsCode}}};`;
    }
    ctx.addLine(
      `let w${componentID} = ${templateKey} in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap[${templateKey}]] : false;`
    );
    let shouldProxy = !ctx.parentNode;
    if (shouldProxy) {
      let id = ctx.generateID();
      ctx.rootContext.rootNode = id;
      shouldProxy = true;
      ctx.rootContext.shouldDefineResult = true;
      ctx.addLine(`let vn${id} = {};`);
      ctx.addLine(`result = vn${id};`);
    }
    if (hasDynamicProps) {
      const dynamicProp = ctx.formatExpression(node.getAttribute("t-props")!);
      ctx.addLine(`let props${componentID} = Object.assign({${propStr}}, ${dynamicProp});`);
    } else {
      ctx.addLine(`let props${componentID} = {${propStr}};`);
    }
    ctx.addIf(
      `w${componentID} && w${componentID}.__owl__.currentFiber && !w${componentID}.__owl__.vnode`
    );
    ctx.addLine(`w${componentID}.destroy();`);
    ctx.addLine(`w${componentID} = false;`);
    ctx.closeIf();
    let registerCode = "";
    if (shouldProxy) {
      registerCode = `utils.defineProxy(vn${ctx.rootNode}, pvnode);`;
    }
    // SLOTS
    const varDefs: string[] = [];
    const hasSlots = node.childNodes.length;
    if (hasSlots) {
      ctx.rootContext.shouldTrackScope = true;
      for (let v of Object.values(ctx.variables)) {
        if (v["id"]) {
          varDefs.push(v["id"]);
        }
      }
    }
    let scopeVars;
    if (hasSlots) {
      let scope = ctx.scopeVars.length ? `Object.assign({}, scope)` : `{}`;
      let vars = varDefs.length ? `{${varDefs.join(",")}}` : "undefined";
      scopeVars = `${scope}, ${vars}`;
    } else {
      scopeVars = "undefined, undefined";
    }
    ctx.addIf(`w${componentID}`);
    // need to update component
    let styleCode = "";
    if (tattStyle) {
      styleCode = `.then(()=>{if (w${componentID}.__owl__.isDestroyed) {return};w${componentID}.el.style=${tattStyle};});`;
    }
    ctx.addLine(
      `w${componentID}.__updateProps(props${componentID}, extra.fiber${scopeVars &&
        ", " + scopeVars})${styleCode};`
    );
    ctx.addLine(`let pvnode = w${componentID}.__owl__.pvnode;`);
    if (registerCode) {
      ctx.addLine(registerCode);
    }
    if (ctx.parentNode) {
      ctx.addLine(`c${ctx.parentNode}.push(pvnode);`);
    }
    ctx.addElse();
    // new component
    let dynamicFallback = "";
    if (!value.match(INTERP_REGEXP)) {
      dynamicFallback = `|| ${ctx.formatExpression(value)}`;
    }
    const interpValue = ctx.interpolate(value);
    ctx.addLine(`let componentKey${componentID} = ${interpValue};`);
    ctx.addLine(
      `let W${componentID} = context.constructor.components[componentKey${componentID}] || QWeb.components[componentKey${componentID}]${dynamicFallback};`
    );
    // maybe only do this in dev mode...
    ctx.addLine(
      `if (!W${componentID}) {throw new Error('Cannot find the definition of component "' + componentKey${componentID} + '"')}`
    );
    ctx.addLine(`w${componentID} = new W${componentID}(parent, props${componentID});`);
    if (transition) {
      ctx.addLine(`const __patch${componentID} = w${componentID}.__patch;`);
      ctx.addLine(
        `w${componentID}.__patch = fiber => {__patch${componentID}.call(w${componentID}, fiber); if(!w${componentID}.__owl__.transitionInserted){w${componentID}.__owl__.transitionInserted = true;utils.transitionInsert(w${componentID}.__owl__.vnode, '${transition}');}};`
      );
    }
    ctx.addLine(`parent.__owl__.cmap[${templateKey}] = w${componentID}.__owl__.id;`);
    if (hasSlots) {
      const clone = <Element>node.cloneNode(true);
      const slotNodes = clone.querySelectorAll("[t-set]");
      const slotId = QWeb.nextSlotId++;
      ctx.addLine(`w${componentID}.__owl__.slotId = ${slotId};`);
      if (slotNodes.length) {
        for (let i = 0, length = slotNodes.length; i < length; i++) {
          const slotNode = slotNodes[i];
          slotNode.parentElement!.removeChild(slotNode);
          const key = slotNode.getAttribute("t-set")!;
          slotNode.removeAttribute("t-set");
          const slotFn = qweb._compile(`slot_${key}_template`, slotNode, ctx);
          QWeb.slots[`${slotId}_${key}`] = slotFn;
        }
      }
      if (clone.childNodes.length) {
        const t = clone.ownerDocument!.createElement("t");
        for (let child of Object.values(clone.childNodes)) {
          t.appendChild(child);
        }
        const slotFn = qweb._compile(`slot_default_template`, t, ctx);
        QWeb.slots[`${slotId}_default`] = slotFn;
      }
    }
    ctx.addLine(`let def${defID} = w${componentID}.__prepare(extra.fiber, ${scopeVars});`);
    // hack: specify empty remove hook to prevent the node from being removed from the DOM
    const insertHook = refExpr ? `insert(vn) {${refExpr}},` : "";
    ctx.addLine(
      `let pvnode = h('dummy', {key: ${templateKey}, hook: {${insertHook}remove() {},destroy(vn) {${finalizeComponentCode}}}});`
    );
    ctx.addLine(`const fiber = w${componentID}.__owl__.currentFiber;`);
    ctx.addLine(
      `def${defID}.then(function () { if (fiber.isCompleted) { return; } const vnode = fiber.vnode; pvnode.sel = vnode.sel; ${createHook}});`
    );
    if (registerCode) {
      ctx.addLine(registerCode);
    }
    if (ctx.parentNode) {
      ctx.addLine(`c${ctx.parentNode}.push(pvnode);`);
    }
    ctx.addLine(`w${componentID}.__owl__.pvnode = pvnode;`);
    ctx.closeIf();
    if (classObj) {
      ctx.addLine(`w${componentID}.__owl__.classObj=${classObj};`);
    }
    ctx.addLine(`w${componentID}.__owl__.parentLastFiberId = extra.fiber.id;`);
    return true;
  }
 });
@@ -1,66 +0,0 @@
 import type { ComponentNode } from "./component_node";
 import type { Fiber } from "./fibers";
 // Maps fibers to thrown errors
 export const fibersInError: WeakMap<Fiber, any> = new WeakMap();
 export const nodeErrorHandlers: WeakMap<ComponentNode, ((error: any) => void)[]> = new WeakMap();
 function _handleError(node: ComponentNode | null, error: any, isFirstRound = false): boolean {
  if (!node) {
    return false;
  }
  const fiber = node.fiber;
  if (fiber) {
    fibersInError.set(fiber, error);
  }
  const errorHandlers = nodeErrorHandlers.get(node);
  if (errorHandlers) {
    let stopped = false;
    // execute in the opposite order
    for (let i = errorHandlers.length - 1; i >= 0; i--) {
      try {
        errorHandlers[i](error);
        stopped = true;
        break;
      } catch (e) {
        error = e;
      }
    }
    if (stopped) {
      if (isFirstRound && fiber) {
        fiber.root.counter--;
      }
      return true;
    }
  }
  return _handleError(node.parent, error);
 }
 type ErrorParams = { error: any } & ({ node: ComponentNode } | { fiber: Fiber });
 export function handleError(params: ErrorParams) {
  const error = params.error;
  const node = "node" in params ? params.node : params.fiber.node;
  const fiber = "fiber" in params ? params.fiber : node.fiber!;
  // resets the fibers on components if possible. This is important so that
  // new renderings can be properly included in the initial one, if any.
  let current: Fiber | null = fiber;
  do {
    current.node.fiber = current;
    current = current.parent;
  } while (current);
  fibersInError.set(fiber.root, error);
  const handled = _handleError(node, error, true);
  if (!handled) {
    console.warn(`[Owl] Unhandled error. Destroying the root component`);
    try {
      node.app.destroy();
    } catch (e) {
      console.error(e);
    }
  }
 }
@@ -0,0 +1,302 @@
 import { h, VNode } from "../vdom/index";
 import { Component } from "./component";
 import { scheduler } from "./scheduler";
 /**
 * Owl Fiber Class
 *
 * Fibers are small abstractions designed to contain all the internal state
 * associated with a "rendering work unit", relative to a specific component.
 *
 * A rendering will cause the creation of a fiber for each impacted components.
 *
 * Fibers capture all that necessary information, which is critical to owl
 * asynchronous rendering pipeline. Fibers can be cancelled, can be in different
 * states and in general determine the state of the rendering.
 */
 export class Fiber {
  static nextId: number = 1;
  id: number = Fiber.nextId++;
  // The force attribute determines if a rendering should bypass the `shouldUpdate`
  // method potentially implemented by a component. It is usually set to false.
  force: boolean;
  // isCompleted means that the rendering corresponding to this fiber's work is
  // done, either because the component has been mounted or patched, or because
  // fiber has been cancelled.
  isCompleted: boolean = false;
  // the fibers corresponding to component updates (updateProps) need to call
  // the willPatch and patched hooks from the corresponding component. However,
  // fibers corresponding to a new component do not need to do that. So, the
  // shouldPatch hook is the boolean that we check whenever we need to apply
  // a patch.
  shouldPatch: boolean = true;
  // isRendered is the last state of a fiber. If true, this means that it has
  // been rendered and is inert (so, it should not be taken into account when
  // counting the number of active fibers).
  isRendered: boolean = false;
  // the counter number is a critical information. It is only necessary for a
  // root fiber.  For that fiber, this number counts the number of active sub
  // fibers.  When that number reaches 0, the fiber can be applied by the
  // scheduler.
  counter: number = 0;
  target: HTMLElement | null;
  scope: any;
  vars: any;
  component: Component<any, any>;
  vnode: VNode | null = null;
  root: Fiber;
  child: Fiber | null = null;
  sibling: Fiber | null = null;
  lastChild: Fiber | null = null;
  parent: Fiber | null = null;
  error?: Error;
  constructor(parent: Fiber | null, component: Component<any, any>, force, target) {
    this.component = component;
    this.force = force;
    this.target = target;
    const __owl__ = component.__owl__;
    this.scope = __owl__.scope;
    this.vars = __owl__.vars;
    this.root = parent ? parent.root : this;
    this.parent = parent;
    let oldFiber = __owl__.currentFiber;
    if (oldFiber && !oldFiber.isCompleted) {
      if (oldFiber.root === oldFiber && !parent) {
        // both oldFiber and this fiber are root fibers
        this._reuseFiber(oldFiber);
        return oldFiber;
      } else {
        this._remapFiber(oldFiber);
      }
    }
    this.root.counter++;
    __owl__.currentFiber = this;
  }
  /**
   * When the oldFiber is not completed yet, and both oldFiber and this fiber
   * are root fibers, we want to reuse the oldFiber instead of creating a new
   * one. Doing so will guarantee that the initiator(s) of those renderings will
   * be notified (the promise will resolve) when the last rendering will be done.
   *
   * This function thus assumes that oldFiber is a root fiber.
   */
  _reuseFiber(oldFiber: Fiber) {
    oldFiber.cancel(); // cancel children fibers
    oldFiber.isCompleted = false; // keep the root fiber alive
    oldFiber.isRendered = false; // the fiber has to be re-rendered
    if (oldFiber.child) {
      // remove relation to children
      oldFiber.child.parent = null;
      oldFiber.child = null;
      oldFiber.lastChild = null;
    }
    oldFiber.counter = 1; // re-initialize counter
    oldFiber.id = Fiber.nextId++;
  }
  /**
   * In some cases, a rendering initiated at some component can detect that it
   * should be part of a larger rendering initiated somewhere up the component
   * tree.  In that case, it needs to cancel the previous rendering and
   * remap itself as a part of the current parent rendering.
   */
  _remapFiber(oldFiber: Fiber) {
    oldFiber.cancel();
    this.shouldPatch = oldFiber.shouldPatch;
    if (oldFiber === oldFiber.root) {
      oldFiber.counter++;
    }
    if (oldFiber.parent && !this.parent) {
      // re-map links
      this.parent = oldFiber.parent;
      this.root = this.parent.root;
      this.sibling = oldFiber.sibling;
      if (this.parent.lastChild === oldFiber) {
        this.parent.lastChild = this;
      }
      if (this.parent.child === oldFiber) {
        this.parent.child = this;
      } else {
        let current = this.parent.child!;
        while (true) {
          if (current.sibling === oldFiber) {
            current.sibling = this;
            break;
          }
          current = current.sibling!;
        }
      }
    }
  }
  /**
   * This function has been taken from
   * https://medium.com/react-in-depth/the-how-and-why-on-reacts-usage-of-linked-list-in-fiber-67f1014d0eb7
   */
  _walk(doWork: (f: Fiber) => Fiber | null) {
    let root = this;
    let current: Fiber = this;
    while (true) {
      const child = doWork(current);
      if (child) {
        current = child;
        continue;
      }
      if (current === root) {
        return;
      }
      while (!current.sibling) {
        if (!current.parent || current.parent === root) {
          return;
        }
        current = current.parent;
      }
      current = current.sibling;
    }
  }
  /**
   * Successfully complete the work of the fiber: call the mount or patch hooks
   * and patch the DOM. This function is called once the fiber and its children
   * are ready, and the scheduler decides to process it.
   */
  complete() {
    let component = this.component;
    let fiber: Fiber = this;
    this.isCompleted = true;
    if (!this.target && !component.__owl__.isMounted) {
      return;
    }
    // build patchQueue
    const patchQueue: Fiber[] = [];
    const doWork: (Fiber) => Fiber | null = function(f) {
      patchQueue.push(f);
      return f.child;
    };
    this._walk(doWork);
    const patchLen = patchQueue.length;
    try {
      // call willPatch hook on each fiber of patchQueue
      for (let i = 0; i < patchLen; i++) {
        fiber = patchQueue[i];
        if (fiber.shouldPatch) {
          component = fiber.component;
          if (component.__owl__.willPatchCB) {
            component.__owl__.willPatchCB();
          }
          component.willPatch();
        }
      }
      // call __patch on each fiber of (reversed) patchQueue
      for (let i = patchLen - 1; i >= 0; i--) {
        fiber = patchQueue[i];
        component = fiber.component;
        component.__patch(fiber.vnode!);
        if (!fiber.shouldPatch && (!fiber.target || i !== 0)) {
          component.__owl__.pvnode!.elm = component.__owl__.vnode!.elm;
        }
        component.__owl__.currentFiber = null;
      }
      // insert into the DOM (mount case)
      let inDOM = false;
      if (this.target) {
        this.target.appendChild(this.component.el!);
        inDOM = document.body.contains(this.target);
      }
      // call patched/mounted hook on each fiber of (reversed) patchQueue
      for (let i = patchLen - 1; i >= 0; i--) {
        fiber = patchQueue[i];
        component = fiber.component;
        if (fiber.shouldPatch && !this.target) {
          component.patched();
          if (component.__owl__.patchedCB) {
            component.__owl__.patchedCB();
          }
        } else if (this.target ? inDOM : true) {
          component.__callMounted();
        }
      }
    } catch (e) {
      // if there is no current fiber on component, we are in the situation where
      // components were patched to the DOM, but a mounted/patched hook threw an
      // error.  In that case, we cannot manage the error at a lower level than
      // the root fiber, since some components may not have been properly mounted
      // patched yet.
      const errorFiber = component.__owl__.currentFiber ? fiber : this;
      errorFiber.handleError(e);
    }
  }
  /**
   * Cancel a fiber and all its children.
   */
  cancel() {
    this._walk(f => {
      if (!f.isRendered) {
        f.root.counter--;
      }
      f.isCompleted = true;
      return f.child;
    });
  }
  /**
   * This is the global error handler for errors occurring in Owl main lifecycle
   * methods.  Caught errors are triggered on the QWeb instance, and are
   * potentially given to some parent component which implements `catchError`.
   *
   * If there are no such component, we destroy everything. This is better than
   * being in a corrupted state.
   */
  handleError(error: Error) {
    let component = this.component;
    this.vnode = component.__owl__.vnode || h("div");
    const qweb = component.env.qweb;
    let root = component;
    let canCatch = false;
    while (component && !(canCatch = !!component.catchError)) {
      root = component;
      component = component.__owl__.parent!;
    }
    qweb.trigger("error", error);
    if (canCatch) {
      // this.root.isCompleted = false
      this.root.isCompleted = false;
      // component.__owl__.currentFiber!.root.isCompleted = false;
      component.catchError!(error);
    } else {
      // the 3 next lines aim to mark the root fiber as being in error, and
      // to force it to end, without waiting for its children
      this.root.counter = 0;
      this.root.error = error;
      scheduler.flush();
      root.destroy();
    }
  }
 }
@@ -1,236 +0,0 @@
 import { BDom, mount } from "../blockdom";
 import type { ComponentNode } from "./component_node";
 import { fibersInError, handleError } from "./error_handling";
 import { STATUS } from "./status";
 /**
 * Cleans on the root fiber the patch and willPatch fiber lists
 * It is typically needed when the same root fiber needs to recycle on
 * of its children or grandchildren's fiber.
 */
 function cleanPatchableFiber(child: Fiber, root: RootFiber) {
  const { willPatch, patched } = root;
  let i = willPatch.indexOf(child);
  if (i > -1) {
    willPatch.splice(i, 1);
  }
  i = patched.indexOf(child);
  if (i > -1) {
    patched.splice(i, 1);
  }
 }
 export function makeChildFiber(node: ComponentNode, parent: Fiber): Fiber {
  let current = node.fiber;
  if (current) {
    // current is necessarily a rootfiber here
    let root = parent.root;
    const isSameRoot = current.root === root;
    cancelFibers(root, current.children);
    current.children = [];
    current.parent = parent;
    // only increment our rendering if we were not
    // already accounted for, or that we have been rendered
    // already (in which case our fiber was removed from the root rendering)
    if (!isSameRoot || current.bdom) {
      root.counter++;
    }
    if (isSameRoot) {
      cleanPatchableFiber(current, root);
    }
    current.bdom = null;
    current.root = root;
    return current;
  }
  return new Fiber(node, parent);
 }
 export function makeRootFiber(node: ComponentNode): Fiber {
  let current = node.fiber;
  if (current) {
    let root = current.root;
    root.counter -= cancelFibers(root, current.children);
    current.children = [];
    root.counter++;
    current.bdom = null;
    if (fibersInError.has(current)) {
      fibersInError.delete(current);
      fibersInError.delete(root);
      current.appliedToDom = false;
    }
    return current;
  }
  const fiber = new RootFiber(node, null);
  if (node.willPatch.length) {
    fiber.willPatch.push(fiber);
  }
  if (node.patched.length) {
    fiber.patched.push(fiber);
  }
  return fiber;
 }
 /**
 * @returns number of not-yet rendered fibers cancelled
 */
 function cancelFibers(root: any, fibers: Fiber[]): number {
  let result = 0;
  for (let fiber of fibers) {
    fiber.node.fiber = null;
    fiber.root = root;
    if (!fiber.bdom) {
      result++;
    }
    result += cancelFibers(root, fiber.children);
  }
  return result;
 }
 export class Fiber {
  node: ComponentNode;
  bdom: BDom | null = null;
  root: RootFiber;
  parent: Fiber | null;
  children: Fiber[] = [];
  appliedToDom = false;
  constructor(node: ComponentNode, parent: Fiber | null) {
    this.node = node;
    this.parent = parent;
    if (parent) {
      const root = parent.root;
      root.counter++;
      this.root = root;
      parent.children.push(this);
    } else {
      this.root = this as any;
    }
  }
 }
 export class RootFiber extends Fiber {
  counter: number = 1;
  // only add stuff in this if they have registered some hooks
  willPatch: Fiber[] = [];
  patched: Fiber[] = [];
  mounted: Fiber[] = [];
  // A fiber is typically locked when it is completing and the patch has not, or is being applied.
  // i.e.: render triggered in onWillUnmount or in willPatch will be delayed
  locked: boolean = false;
  complete() {
    const node = this.node;
    this.locked = true;
    let current: Fiber | undefined = undefined;
    try {
      // Step 1: calling all willPatch lifecycle hooks
      for (current of this.willPatch) {
        // because of the asynchronous nature of the rendering, some parts of the
        // UI may have been rendered, then deleted in a followup rendering, and we
        // do not want to call onWillPatch in that case.
        let node = current.node;
        if (node.fiber === current) {
          const component = node.component;
          for (let cb of node.willPatch) {
            cb.call(component);
          }
        }
      }
      current = undefined;
      // Step 2: patching the dom
      node.bdom!.patch(this.bdom!, Object.keys(node.children).length > 0);
      node.cleanOutdatedChildren();
      this.appliedToDom = true;
      this.locked = false;
      // unregistering the fiber before mounted since it can do another render
      // and that the current rendering is obviously completed
      node.fiber = null;
      // Step 4: calling all mounted lifecycle hooks
      let mountedFibers = this.mounted;
      while ((current = mountedFibers.pop())) {
        current = current;
        if (current.appliedToDom) {
          for (let cb of current.node.mounted) {
            cb();
          }
        }
      }
      // Step 5: calling all patched hooks
      let patchedFibers = this.patched;
      while ((current = patchedFibers.pop())) {
        current = current;
        if (current.appliedToDom) {
          for (let cb of current.node.patched) {
            cb();
          }
        }
      }
    } catch (e) {
      this.locked = false;
      handleError({ fiber: current || this, error: e });
    }
  }
 }
 type Position = "first-child" | "last-child";
 export interface MountOptions {
  position?: Position;
 }
 export class MountFiber extends RootFiber {
  target: HTMLElement;
  position: Position;
  constructor(node: ComponentNode, target: HTMLElement, options: MountOptions = {}) {
    super(node, null);
    this.target = target;
    this.position = options.position || "last-child";
  }
  complete() {
    let current: Fiber | undefined = this;
    try {
      const node = this.node;
      if (node.bdom) {
        // this is a complicated situation: if we mount a fiber with an existing
        // bdom, this means that this same fiber was already completed, mounted,
        // but a crash occurred in some mounted hook. Then, it was handled and
        // the new rendering is being applied.
        node.updateDom();
      } else {
        node.bdom = this.bdom;
        if (this.position === "last-child" || this.target.childNodes.length === 0) {
          mount(node.bdom!, this.target);
        } else {
          const firstChild = this.target.childNodes[0];
          mount(node.bdom!, this.target, firstChild);
        }
      }
      // unregistering the fiber before mounted since it can do another render
      // and that the current rendering is obviously completed
      node.fiber = null;
      node.status = STATUS.MOUNTED;
      this.appliedToDom = true;
      let mountedFibers = this.mounted;
      while ((current = mountedFibers.pop())) {
        if (current.appliedToDom) {
          for (let cb of current.node.mounted) {
            cb();
          }
        }
      }
    } catch (e) {
      handleError({ fiber: current as Fiber, error: e });
    }
  }
 }
@@ -1,36 +0,0 @@
 import { filterOutModifiersFromData } from "../blockdom/config";
 export const mainEventHandler = (data: any, ev: Event, currentTarget?: EventTarget | null) => {
  const { data: _data, modifiers } = filterOutModifiersFromData(data);
  data = _data;
  let stopped = false;
  if (modifiers.length) {
    let selfMode = false;
    const isSelf = ev.target === currentTarget;
    for (const mod of modifiers) {
      switch (mod) {
        case "self":
          selfMode = true;
          if (isSelf) {
            continue;
          } else {
            return stopped;
          }
        case "prevent":
          if ((selfMode && isSelf) || !selfMode) ev.preventDefault();
          continue;
        case "stop":
          if ((selfMode && isSelf) || !selfMode) ev.stopPropagation();
          stopped = true;
          continue;
      }
    }
  }
  // If handler is empty, the array slot 0 will also be empty, and data will not have the property 0
  // We check this rather than data[0] being truthy (or typeof function) so that it crashes
  // as expected when there is a handler expression that evaluates to a falsy value
  if (Object.hasOwnProperty.call(data, 0)) {
    data[0].call(data[1] ? data[1].__owl__.component : null, ev);
  }
  return stopped;
 };
@@ -1,71 +0,0 @@
 import { getCurrent } from "./component_node";
 import { nodeErrorHandlers } from "./error_handling";
 // -----------------------------------------------------------------------------
 //  hooks
 // -----------------------------------------------------------------------------
 export function onWillStart(fn: () => Promise<void> | void | any) {
  const node = getCurrent()!;
  node.willStart.push(fn);
 }
 export function onWillUpdateProps(fn: (nextProps: any) => Promise<void> | void | any) {
  const node = getCurrent()!;
  node.willUpdateProps.push(fn);
 }
 export function onMounted(fn: () => void | any) {
  const node = getCurrent()!;
  node.mounted.push(fn);
 }
 export function onWillPatch(fn: () => Promise<void> | any | void) {
  const node = getCurrent()!;
  node.willPatch.unshift(fn);
 }
 export function onPatched(fn: () => void | any) {
  const node = getCurrent()!;
  node.patched.push(fn);
 }
 export function onWillUnmount(fn: () => Promise<void> | void | any) {
  const node = getCurrent()!;
  node.willUnmount.unshift(fn);
 }
 export function onWillDestroy(fn: () => Promise<void> | void | any) {
  const node = getCurrent()!;
  node.willDestroy.push(fn);
 }
 export function onWillRender(fn: () => void | any) {
  const node = getCurrent()!;
  const renderFn = node.renderFn;
  node.renderFn = () => {
    fn();
    return renderFn();
  };
 }
 export function onRendered(fn: () => void | any) {
  const node = getCurrent()!;
  const renderFn = node.renderFn;
  node.renderFn = () => {
    const result = renderFn();
    fn();
    return result;
  };
 }
 type OnErrorCallback = (error: any) => void | any;
 export function onError(callback: OnErrorCallback) {
  const node = getCurrent()!;
  let handlers = nodeErrorHandlers.get(node);
  if (!handlers) {
    handlers = [];
    nodeErrorHandlers.set(node, handlers);
  }
  handlers.push(callback);
 }
@@ -1,32 +1,8 @@
-import { Component } from "./component";
+import { QWeb } from "../qweb/index";
 /**
 * Apply default props (only top level).
 *
 * Note that this method does modify in place the props
 */
 export function applyDefaultProps(props: { [key: string]: any }, ComponentClass: typeof Component) {
  const defaultProps = (ComponentClass as any).defaultProps;
  if (defaultProps) {
    for (let propName in defaultProps) {
      if (props![propName] === undefined) {
        props![propName] = defaultProps[propName];
      }
    }
  }
 }
 //------------------------------------------------------------------------------
 // Prop validation helper
 //------------------------------------------------------------------------------
 function getPropDescription(staticProps: any) {
  if (staticProps instanceof Array) {
    return Object.fromEntries(
      staticProps.map((p) => (p.endsWith("?") ? [p.slice(0, -1), false] : [p, true]))
    );
  }
  return staticProps || { "*": true };
 }
 /**
 * Validate the component props (or next props) against the (static) props
@@ -34,44 +10,50 @@ function getPropDescription(staticProps: any) {
 * visit recursively the props and all the children to check if they are valid.
 * This is why it is only done in 'dev' mode.
 */
 export const validateProps = function (name: string | typeof Component, props: any, parent?: any) {
  const ComponentClass = (
    typeof name !== "string" ? name : parent.constructor.components[name]
  ) as typeof Component;
-  applyDefaultProps(props, ComponentClass);
+QWeb.utils.validateProps = function(Widget, props: Object) {
-
+  const propsDef = (<any>Widget).props;
-  let propsDef = getPropDescription(ComponentClass.props);
+  if (propsDef instanceof Array) {
-  const allowAdditionalProps = "*" in propsDef;
+    // list of strings (prop names)
-
+    for (let i = 0, l = propsDef.length; i < l; i++) {
-  for (let propName in propsDef) {
+      const propName = propsDef[i];
-    if (propName === "*") {
+      if (propName[propName.length - 1] === "?") {
-      continue;
+        // optional prop
-    }
+        break;
-    if (props[propName] === undefined) {
+      }
-      if (propsDef[propName] && !propsDef[propName].optional) {
+      if (!(propName in props)) {
-        throw new Error(`Missing props '${propName}' (component '${ComponentClass.name}')`);
+        throw new Error(`Missing props '${propsDef[i]}' (component '${Widget.name}')`);
      } else {
        continue;
      }
    }
-    let isValid;
+    for (let key in props) {
-    try {
+      if (!propsDef.includes(key) && !propsDef.includes(key + "?")) {
-      isValid = isValidProp(props[propName], propsDef[propName]);
+        throw new Error(`Unknown prop '${key}' given to component '${Widget.name}'`);
-    } catch (e) {
+      }
      (e as Error).message = `Invalid prop '${propName}' in component ${ComponentClass.name} (${
        (e as Error).message
      })`;
      throw e;
    }
-    if (!isValid) {
+  } else if (propsDef) {
-      throw new Error(`Invalid Prop '${propName}' in component '${ComponentClass.name}'`);
+    // propsDef is an object now
    for (let propName in propsDef) {
      if (props[propName] === undefined) {
        if (propsDef[propName] && !propsDef[propName].optional) {
          throw new Error(`Missing props '${propName}' (component '${Widget.name}')`);
        } else {
          break;
        }
      }
      let isValid;
      try {
        isValid = isValidProp(props[propName], propsDef[propName]);
      } catch (e) {
        e.message = `Invalid prop '${propName}' in component ${Widget.name} (${e.message})`;
        throw e;
      }
      if (!isValid) {
        throw new Error(`Invalid Prop '${propName}' in component '${Widget.name}'`);
      }
    }
  }
  if (!allowAdditionalProps) {
    for (let propName in props) {
      if (!(propName in propsDef)) {
-        throw new Error(`Unknown prop '${propName}' given to component '${ComponentClass.name}'`);
+        throw new Error(`Unknown prop '${propName}' given to component '${Widget.name}'`);
      }
    }
  }
@@ -80,7 +62,7 @@ export const validateProps = function (name: string | typeof Component, props: a
 /**
 * Check if an invidual prop value matches its (static) prop definition
 */
-function isValidProp(prop: any, propDef: any): boolean {
+function isValidProp(prop, propDef): boolean {
  if (propDef === true) {
    return true;
  }
@@ -1,34 +1,51 @@
-import { fibersInError } from "./error_handling";
+import { Fiber } from "./fiber";
 import { Fiber, RootFiber } from "./fibers";
 import { STATUS } from "./status";
-// -----------------------------------------------------------------------------
+/**
-//  Scheduler
+ * Owl Scheduler Class
-// -----------------------------------------------------------------------------
+ *
 * The scheduler is the part of Owl that will effectively apply a rendering
 * whenever a fiber is ready.
 *
 * Briefly, it can be used to register root fibers.  Whenever there is an
 * active root fiber, it will poll continuously each animation frame (so, about
 * once every 16ms) and whenever a root fiber is ready, it will apply it.
 */
 interface Task {
  fiber: Fiber;
  callback: (err?: Error) => void;
 }
 export class Scheduler {
-  tasks: Set<RootFiber> = new Set();
+  tasks: Task[] = [];
  isRunning: boolean = false;
-  requestAnimationFrame: Window["requestAnimationFrame"];
+  requestAnimationFrame: typeof window.requestAnimationFrame;
-  constructor(requestAnimationFrame: Window["requestAnimationFrame"]) {
+  constructor(requestAnimationFrame) {
    this.requestAnimationFrame = requestAnimationFrame;
  }
-  start() {
+  addFiber(fiber): Promise<void> {
-    this.isRunning = true;
+    // if the fiber was remapped into a larger rendering fiber, it may not be a
-    this.scheduleTasks();
+    // root fiber.  But we only want to register root fibers
-  }
+    fiber = fiber.root;
-
+    return new Promise((resolve, reject) => {
-  stop() {
+      if (fiber.error) {
-    this.isRunning = false;
+        return reject(fiber.error);
-  }
+      }
-
+      this.tasks.push({
-  addFiber(fiber: Fiber) {
+        fiber,
-    this.tasks.add(fiber.root);
+        callback: () => {
-    if (!this.isRunning) {
+          if (fiber.error) {
-      this.start();
+            return reject(fiber.error);
-    }
+          }
          resolve();
        }
      });
      if (!this.isRunning) {
        this.scheduleTasks();
      }
    });
  }
  /**
@@ -36,39 +53,40 @@ export class Scheduler {
   * Other tasks are left unchanged.
   */
  flush() {
-    this.tasks.forEach((fiber) => {
+    let tasks = this.tasks;
-      if (fiber.root !== fiber) {
+    this.tasks = [];
-        this.tasks.delete(fiber);
+    tasks = tasks.filter(task => {
-        return;
+      if (task.fiber.isCompleted) {
        task.callback();
        return false;
      }
-      const hasError = fibersInError.has(fiber);
+      if (task.fiber.counter === 0) {
-      if (hasError && fiber.counter !== 0) {
+        if (!task.fiber.error) {
-        this.tasks.delete(fiber);
+          task.fiber.complete();
-        return;
+          if (!task.fiber.isCompleted) {
-      }
+            return true;
-      if (fiber.node.status === STATUS.DESTROYED) {
+          }
        this.tasks.delete(fiber);
        return;
      }
      if (fiber.counter === 0) {
        if (!hasError) {
          fiber.complete();
        }
-        this.tasks.delete(fiber);
+        task.callback();
        return false;
      }
      return true;
    });
-    if (this.tasks.size === 0) {
+    this.tasks = tasks.concat(this.tasks);
      this.stop();
    }
  }
  scheduleTasks() {
    this.isRunning = true;
    this.requestAnimationFrame(() => {
      this.flush();
-      if (this.isRunning) {
+      if (this.tasks.length > 0) {
        this.scheduleTasks();
      } else {
        this.isRunning = false;
      }
    });
  }
 }
 const raf = window.requestAnimationFrame.bind(window);
 export const scheduler = new Scheduler(raf);
@@ -1,24 +0,0 @@
 import type { Component } from "./component";
 // -----------------------------------------------------------------------------
 //  Status
 // -----------------------------------------------------------------------------
 export const enum STATUS {
  NEW,
  MOUNTED, // is ready, and in DOM. It has a valid el
  DESTROYED,
 }
 type STATUS_DESCR = "new" | "mounted" | "destroyed";
 export function status(component: Component): STATUS_DESCR {
  switch (component.__owl__.status) {
    case STATUS.NEW:
      return "new";
    case STATUS.MOUNTED:
      return "mounted";
    case STATUS.DESTROYED:
      return "destroyed";
  }
 }
@@ -0,0 +1,30 @@
 import { QWeb } from "./qweb/index";
 /**
 * This file creates and exports the OWL 'config' object, with keys:
 *  - 'mode': 'prod' or 'dev',
 *  - 'env': the environment to use in root components.
 */
 interface Config {
  mode: string;
 }
 export const config = {} as Config;
 Object.defineProperty(config, "mode", {
  get() {
    return QWeb.dev ? "dev" : "prod";
  },
  set(mode: string) {
    QWeb.dev = mode === "dev";
    if (QWeb.dev) {
      const url = `https://github.com/odoo/owl/blob/master/doc/reference/config.md#mode`;
      console.warn(
        `Owl is running in 'dev' mode.  This is not suitable for production use. See ${url} for more information.`
      );
    } else {
      console.log(`Owl is now running in 'prod' mode.`);
    }
  }
 });
@@ -0,0 +1,148 @@
 import { Component } from "./component/component";
 import { scheduler } from "./component/scheduler";
 import { EventBus } from "./core/event_bus";
 import { Observer } from "./core/observer";
 /**
 * The `Context` object provides a way to share data between an arbitrary number
 * of component. Usually, data is passed from a parent to its children component,
 * but when we have to deal with some mostly global information, this can be
 * annoying, since each component will need to pass the information to each
 * children, even though some or most of them will not use the information.
 *
 * With a `Context` object, each component can subscribe (with the `useContext`
 * hook) to its state, and will be updated whenever the context state is updated.
 */
 function partitionBy<T>(arr: T[], fn: (t: T) => boolean) {
  let lastGroup: T[] | false = false;
  let lastValue;
  return arr.reduce((acc: T[][], cur) => {
    let curVal = fn(cur);
    if (lastGroup) {
      if (curVal === lastValue) {
        lastGroup.push(cur);
      } else {
        lastGroup = false;
      }
    }
    if (!lastGroup) {
      lastGroup = [cur];
      acc.push(lastGroup);
    }
    lastValue = curVal;
    return acc;
  }, []);
 }
 export class Context extends EventBus {
  state: any;
  observer: Observer;
  rev: number = 1;
  // mapping from component id to last observed context id
  mapping: { [componentId: number]: number } = {};
  constructor(state: Object = {}) {
    super();
    this.observer = new Observer();
    this.observer.notifyCB = () => {
      // notify components in the next microtask tick to ensure that subscribers
      // are notified only once for all changes that occur in the same micro tick
      let rev = this.rev;
      return Promise.resolve().then(() => {
        if (rev === this.rev) {
          this.__notifyComponents();
        }
      });
    };
    this.state = this.observer.observe(state);
    this.subscriptions.update = [];
  }
  /**
   * Instead of using trigger to emit an update event, we actually implement
   * our own function to do that.  The reason is that we need to be smarter than
   * a simple trigger function: we need to wait for parent components to be
   * done before doing children components.  More precisely, if an update
   * as an effect of destroying a children, we do not want to call any code
   * from the child, and certainly not render it.
   *
   * This method implements a simple grouping algorithm by depth. If we have
   * connected components of depths [2, 4,4,4,4, 3,8,8], the Context will notify
   * them in the following groups: [2], [4,4,4,4], [3], [8,8]. Each group will
   * be updated sequentially, but each components in a given group will be done in
   * parallel.
   *
   * This is a very simple algorithm, but it avoids checking if a given
   * component is a child of another.
   */
  async __notifyComponents() {
    const rev = ++this.rev;
    const subscriptions = this.subscriptions.update;
    const groups = partitionBy(subscriptions, s => (s.owner ? s.owner.__owl__.depth : -1));
    for (let group of groups) {
      const proms = group.map(sub => sub.callback.call(sub.owner, rev));
      // at this point, each component in the current group has registered a
      // top level fiber in the scheduler. It could happen that rendering these
      // components is done (if they have no children).  This is why we manually
      // flush the scheduler.  This will force the scheduler to check
      // immediately if they are done, which will cause their rendering
      // promise to resolve earlier, which means that there is a chance of
      // processing the next group in the same frame.
      scheduler.flush();
      await Promise.all(proms);
    }
  }
 }
 /**
 * The`useContext` hook is the normal way for a component to register themselve
 * to context state changes. The `useContext` method returns the context state
 */
 export function useContext(ctx: Context): any {
  const component: Component<any, any> = Component.current!;
  return useContextWithCB(ctx, component, component.render.bind(component));
 }
 export function useContextWithCB(ctx: Context, component: Component<any, any>, method): any {
  const __owl__ = component.__owl__;
  const id = __owl__.id;
  const mapping = ctx.mapping;
  if (id in mapping) {
    return ctx.state;
  }
  if (!__owl__.observer) {
    __owl__.observer = new Observer();
    __owl__.observer.notifyCB = component.render.bind(component);
  }
  const currentCB = __owl__.observer.notifyCB;
  __owl__.observer.notifyCB = function() {
    if (ctx.rev > mapping[id]) {
      // in this case, the context has been updated since we were rendering
      // last, and we do not need to render here with the observer. A
      // rendering is coming anyway, with the correct props.
      return;
    }
    currentCB();
  };
  mapping[id] = 0;
  const renderFn = __owl__.renderFn;
  __owl__.renderFn = function(comp, params) {
    mapping[id] = ctx.rev;
    return renderFn(comp, params);
  };
  ctx.on("update", component, async contextRev => {
    if (mapping[id] < contextRev) {
      mapping[id] = contextRev;
      await method();
    }
  });
  const __destroy = component.__destroy;
  component.__destroy = parent => {
    ctx.off("update", component);
    delete mapping[id];
    __destroy.call(component, parent);
  };
  return ctx.state;
 }
@@ -0,0 +1,79 @@
 /**
 * We define here a simple event bus: it can
 * - emit events
 * - add/remove listeners.
 *
 * This is a useful pattern of communication in many cases.  For OWL, each
 * components and stores are event buses.
 */
 //------------------------------------------------------------------------------
 // Types
 //------------------------------------------------------------------------------
 export type Callback = (...args: any[]) => void;
 export interface Subscription {
  owner: any;
  callback: Callback;
 }
 //------------------------------------------------------------------------------
 // EventBus
 //------------------------------------------------------------------------------
 export class EventBus {
  subscriptions: { [eventType: string]: Subscription[] } = {};
  /**
   * Add a listener for the 'eventType' events.
   *
   * Note that the 'owner' of this event can be anything, but will more likely
   * be a component or a class. The idea is that the callback will be called with
   * the proper owner bound.
   *
   * Also, the owner should be kind of unique. This will be used to remove the
   * listener.
   */
  on(eventType: string, owner: any, callback: Callback) {
    if (!callback) {
      throw new Error("Missing callback");
    }
    if (!this.subscriptions[eventType]) {
      this.subscriptions[eventType] = [];
    }
    this.subscriptions[eventType].push({
      owner,
      callback
    });
  }
  /**
   * Remove a listener
   */
  off(eventType: string, owner: any) {
    const subs = this.subscriptions[eventType];
    if (subs) {
      this.subscriptions[eventType] = subs.filter(s => s.owner !== owner);
    }
  }
  /**
   * Emit an event of type 'eventType'.  Any extra arguments will be passed to
   * the listeners callback.
   */
  trigger(eventType: string, ...args: any[]) {
    const subs = this.subscriptions[eventType] || [];
    for (let i = 0, iLen = subs.length; i < iLen; i++) {
      const sub = subs[i];
      sub.callback.call(sub.owner, ...args);
    }
  }
  /**
   * Remove all subscriptions.
   */
  clear() {
    this.subscriptions = {};
  }
 }
@@ -0,0 +1,95 @@
 /**
 * Owl Observer
 *
 * This code contains the logic that allows Owl to observe and react to state
 * changes.
 *
 * This is a Observer class that can observe any JS values.  The way it works
 * can be summarized thusly:
 * - primitive values are not observed at all
 * - Objects and arrays are observed by replacing them with a Proxy
 * - each object/array metadata are tracked in a weakmap, and keep a revision
 *   number
 *
 * Note that this code is loosely inspired by Vue.
 */
 //------------------------------------------------------------------------------
 // Observer
 //------------------------------------------------------------------------------
 export class Observer {
  rev: number = 1;
  allowMutations: boolean = true;
  dirty: boolean = false;
  weakMap: WeakMap<any, any> = new WeakMap();
  notifyCB() {}
  observe<T>(value: T, parent?: any): T {
    if (value === null || typeof value !== "object" || value instanceof Date) {
      // fun fact: typeof null === 'object'
      return value;
    }
    let metadata = this.weakMap.get(value) || this._observe(value, parent);
    return metadata.proxy;
  }
  revNumber(value): number {
    const metadata = this.weakMap.get(value);
    return metadata ? metadata.rev : 0;
  }
  _observe(value, parent) {
    var self = this;
    const proxy = new Proxy(value, {
      get(target, k) {
        const targetValue = target[k];
        return self.observe(targetValue, value);
      },
      set(target, key: string, newVal): boolean {
        const value = target[key];
        if (newVal !== value) {
          if (!self.allowMutations) {
            throw new Error(
              `Observed state cannot be changed here! (key: "${key}", val: "${newVal}")`
            );
          }
          self._updateRevNumber(target);
          target[key] = newVal;
          self.notifyCB();
        }
        return true;
      },
      deleteProperty(target, key) {
        if (key in target) {
          delete target[key];
          self._updateRevNumber(target);
          self.notifyCB();
        }
        return true;
      }
    });
    const metadata = {
      value,
      proxy,
      rev: this.rev,
      parent
    };
    this.weakMap.set(value, metadata);
    this.weakMap.set(metadata.proxy, metadata);
    return metadata;
  }
  _updateRevNumber(target: any) {
    this.rev++;
    let metadata = this.weakMap.get(target);
    let parent = target;
    do {
      metadata = this.weakMap.get(parent);
      metadata.rev++;
    } while ((parent = metadata.parent) && parent !== target);
  }
 }
@@ -0,0 +1,15 @@
 import { Component } from "../component/component";
 /**
 * We define here OwlEvent, a subclass of CustomEvent, with an additional
 * attribute:
 *  - originalComponent: the component that triggered the event
 */
 export class OwlEvent<T> extends CustomEvent<T> {
  originalComponent: Component<any, any>;
  constructor(component, eventType, options) {
    super(eventType, options);
    this.originalComponent = component;
  }
 }
@@ -1,6 +1,90 @@
-import type { Env } from "./app/app";
+import { Component } from "./component/component";
-import { getCurrent } from "./component/component_node";
+import { Observer } from "./core/observer";
-import { onMounted, onPatched, onWillUnmount } from "./component/lifecycle_hooks";
+
 /**
 * Owl Hook System
 *
 * This file introduces the concept of hooks, similar to React or Vue hooks.
 * We have currently an implementation of:
 * - useState (reactive state)
 * - onMounted
 * - onWillUnmount
 * - useRef
 */
 // -----------------------------------------------------------------------------
 // useState
 // -----------------------------------------------------------------------------
 /**
 * This is the main way a component can be made reactive.  The useState hook
 * will return an observed object (or array).  Changes to that value will then
 * trigger a rerendering of the current component.
 */
 export function useState<T>(state: T): T {
  const component: Component<any, any> = Component.current!;
  const __owl__ = component.__owl__;
  if (!__owl__.observer) {
    __owl__.observer = new Observer();
    __owl__.observer.notifyCB = component.render.bind(component);
  }
  return __owl__.observer.observe(state);
 }
 // -----------------------------------------------------------------------------
 // Life cycle hooks
 // -----------------------------------------------------------------------------
 function makeLifecycleHook(method: string, reverse: boolean = false) {
  if (reverse) {
    return function(cb) {
      const component: Component<any, any> = Component.current!;
      if (component.__owl__[method]) {
        const current = component.__owl__[method];
        component.__owl__[method] = function() {
          current.call(component);
          cb.call(component);
        };
      } else {
        component.__owl__[method] = cb;
      }
    };
  } else {
    return function(cb) {
      const component: Component<any, any> = Component.current!;
      if (component.__owl__[method]) {
        const current = component.__owl__[method];
        component.__owl__[method] = function() {
          cb.call(component);
          current.call(component);
        };
      } else {
        component.__owl__[method] = cb;
      }
    };
  }
 }
 function makeAsyncHook(method: string) {
  return function(cb) {
    const component: Component<any, any> = Component.current!;
    if (component.__owl__[method]) {
      const current = component.__owl__[method];
      component.__owl__[method] = function(...args) {
        return Promise.all[(current.call(component, ...args), cb.call(component, ...args))];
      };
    } else {
      component.__owl__[method] = cb;
    }
  };
 }
 export const onMounted = makeLifecycleHook("mountedCB", true);
 export const onWillUnmount = makeLifecycleHook("willUnmountCB");
 export const onWillPatch = makeLifecycleHook("willPatchCB");
 export const onPatched = makeLifecycleHook("patchedCB", true);
 export const onWillStart = makeAsyncHook("willStartCB");
 export const onWillUpdateProps = makeAsyncHook("willUpdatePropsCB");
 // -----------------------------------------------------------------------------
 // useRef
@@ -10,110 +94,40 @@ import { onMounted, onPatched, onWillUnmount } from "./component/lifecycle_hooks
 * The purpose of this hook is to allow components to get a reference to a sub
 * html node or component.
 */
-export function useRef<T extends HTMLElement = HTMLElement>(name: string): { el: T | null } {
+interface Ref {
-  const node = getCurrent()!;
+  el: HTMLElement | null;
-  const refs = node.refs;
+  comp: Component<any, any> | null;
 }
 export function useRef(name: string): Ref {
  const __owl__ = Component.current!.__owl__;
  return {
-    get el(): T | null {
+    get el(): HTMLElement | null {
-      return refs[name] || null;
+      const val = __owl__.refs && __owl__.refs[name];
      if (val instanceof HTMLElement) {
        return val;
      } else if (val instanceof Component) {
        return val.el;
      }
      return null;
    },
    get comp(): Component<any, any> | null {
      const val = __owl__.refs && __owl__.refs[name];
      return val instanceof Component ? val : null;
    }
  };
 }
 // -----------------------------------------------------------------------------
-// useEnv and useSubEnv
+// useSubEnv
 // -----------------------------------------------------------------------------
 /**
 * This hook is useful as a building block for some customized hooks, that may
 * need a reference to the env of the component calling them.
 */
 export function useEnv<E extends Env>(): E {
  return getCurrent()!.component.env as any;
 }
 /**
 * This hook is a simple way to let components use a sub environment.  Note that
 * like for all hooks, it is important that this is only called in the
 * constructor method.
 */
-export function useSubEnv(envExtension: Env) {
+export function useSubEnv(nextEnv) {
-  const node = getCurrent()!;
+  const component = Component.current!;
-  const env = Object.create(node.childEnv);
+  component.env = Object.assign(Object.create(component.env), nextEnv);
  const descrs = Object.getOwnPropertyDescriptors(envExtension);
  node.childEnv = Object.freeze(Object.defineProperties(env, descrs));
 }
 // -----------------------------------------------------------------------------
 // useEffect
 // -----------------------------------------------------------------------------
 const NO_OP = () => {};
 /**
 * @param {...any} dependencies the dependencies computed by computeDependencies
 * @returns {void|(()=>void)} a cleanup function that reverses the side
 *      effects of the effect callback.
 */
 type Effect = (...dependencies: any[]) => void | (() => void);
 /**
 * This hook will run a callback when a component is mounted and patched, and
 * will run a cleanup function before patching and before unmounting the
 * the component.
 *
 * @param {Effect} effect the effect to run on component mount and/or patch
 * @param {()=>any[]} [computeDependencies=()=>[NaN]] a callback to compute
 *      dependencies that will decide if the effect needs to be cleaned up and
 *      run again. If the dependencies did not change, the effect will not run
 *      again. The default value returns an array containing only NaN because
 *      NaN !== NaN, which will cause the effect to rerun on every patch.
 */
 export function useEffect(effect: Effect, computeDependencies: () => any[] = () => [NaN]) {
  let cleanup: () => void;
  let dependencies: any[];
  onMounted(() => {
    dependencies = computeDependencies();
    cleanup = effect(...dependencies) || NO_OP;
  });
  onPatched(() => {
    const newDeps = computeDependencies();
    const shouldReapply = newDeps.some((val, i) => val !== dependencies[i]);
    if (shouldReapply) {
      dependencies = newDeps;
      cleanup();
      cleanup = effect(...dependencies) || NO_OP;
    }
  });
  onWillUnmount(() => cleanup());
 }
 // -----------------------------------------------------------------------------
 // useExternalListener
 // -----------------------------------------------------------------------------
 /**
 * When a component needs to listen to DOM Events on element(s) that are not
 * part of his hierarchy, we can use the `useExternalListener` hook.
 * It will correctly add and remove the event listener, whenever the
 * component is mounted and unmounted.
 *
 * Example:
 *  a menu needs to listen to the click on window to be closed automatically
 *
 * Usage:
 *  in the constructor of the OWL component that needs to be notified,
 *  `useExternalListener(window, 'click', this._doSomething);`
 * */
 export function useExternalListener(
  target: HTMLElement | typeof window,
  eventName: string,
  handler: EventListener,
  eventParams?: AddEventListenerOptions
 ) {
  const node = getCurrent()!;
  const boundHandler = handler.bind(node.component);
  onMounted(() => target.addEventListener(eventName, boundHandler, eventParams));
  onWillUnmount(() => target.removeEventListener(eventName, boundHandler, eventParams));
 }
@@ -1,57 +1,39 @@
-import {
+/**
-  config,
+ * This file is the main file packaged by rollup (see rollup.config.js).  From
-  createBlock,
+ * this file, we export all public owl elements.
-  html,
+ *
-  list,
+ * Note that dynamic values, such as a date or a commit hash are added by rollup
-  mount as blockMount,
+ */
-  multi,
+import { EventBus } from "./core/event_bus";
-  patch,
+import { Observer } from "./core/observer";
-  remove,
+import { QWeb } from "./qweb/index";
-  text,
+import { config } from "./config";
-  toggler,
+import * as _store from "./store";
-  comment,
+import * as _utils from "./utils";
-} from "./blockdom";
+import * as _tags from "./tags";
-import { mainEventHandler } from "./component/handler";
+import { AsyncRoot } from "./misc/async_root";
 import * as _hooks from "./hooks";
 import * as _context from "./context";
 import { Link } from "./router/link";
 import { RouteComponent } from "./router/route_component";
 import { Router } from "./router/router";
 config.shouldNormalizeDom = false;
 config.mainEventHandler = mainEventHandler;
 export const blockDom = {
  config,
  // bdom entry points
  mount: blockMount,
  patch,
  remove,
  // bdom block types
  list,
  multi,
  text,
  toggler,
  createBlock,
  html,
  comment,
 };
 export { App, mount } from "./app/app";
 export { Component } from "./component/component";
-export { useComponent } from "./component/component_node";
+export { QWeb };
-export { status } from "./component/status";
+export { config };
 export { Memo } from "./memo";
 export { xml } from "./app/template_set";
 export { useState, reactive } from "./reactivity";
 export { useEffect, useEnv, useExternalListener, useRef, useSubEnv } from "./hooks";
 export { EventBus, whenReady, loadFile, markup } from "./utils";
 export {
  onWillStart,
  onMounted,
  onWillUnmount,
  onWillUpdateProps,
  onWillPatch,
  onPatched,
  onWillRender,
  onRendered,
  onWillDestroy,
  onError,
 } from "./component/lifecycle_hooks";
 export const Context = _context.Context;
 export const useState = _hooks.useState;
 export const core = { EventBus, Observer };
 export const router = { Router, RouteComponent, Link };
 export const Store = _store.Store;
 export const utils = _utils;
 export const tags = _tags;
 export const misc = { AsyncRoot };
 export const hooks = Object.assign({}, _hooks, {
  useContext: _context.useContext,
  useDispatch: _store.useDispatch,
  useGetters: _store.useGetters,
  useStore: _store.useStore
 });
 export const __info__ = {};
@@ -1,47 +0,0 @@
 import { Component } from "./component/component";
 import type { ComponentNode } from "./component/component_node";
 import { xml } from "./app/template_set";
 import { Fiber } from "./component/fibers";
 export class Memo extends Component {
  static template = xml`<t t-slot="default"/>`;
  constructor(props: any, env: any, node: ComponentNode) {
    super(props, env, node);
    // prevent patching process conditionally
    let applyPatch = false;
    const patchFn = node.patch;
    node.patch = () => {
      if (applyPatch) {
        patchFn.call(node);
        applyPatch = false;
      }
    };
    // check props change, and render/apply patch if it changed
    let prevProps = props;
    const updateAndRender = node.updateAndRender;
    node.updateAndRender = function (props: any, parentFiber: Fiber) {
      const shouldUpdate = !shallowEqual(prevProps, props);
      if (shouldUpdate) {
        prevProps = props;
        updateAndRender.call(node, props, parentFiber);
        applyPatch = true;
      }
      return Promise.resolve();
    };
  }
 }
 /**
 * we assume that each object have the same set of keys
 */
 function shallowEqual(p1: any, p2: any): boolean {
  for (let k in p1) {
    if (k !== "slots" && p1[k] !== p2[k]) {
      return false;
    }
  }
  return true;
 }
@@ -0,0 +1,19 @@
 import { Component } from "../component/component";
 import { xml } from "../tags";
 /**
 * AsyncRoot
 *
 * Owl is by default asynchronous, and the user interface will wait for all its
 * subcomponents to be rendered before updating the DOM. This is most of the
 * time what we want, but in some cases, it makes sense to "detach" a component
 * from this coordination.  This is the goal of the AsyncRoot component.
 */
 export class AsyncRoot extends Component<any, any> {
  static template = xml`<t t-slot="default"/>`;
  async __updateProps(nextProps, parentFiber) {
    this.render(parentFiber.force);
  }
 }
@@ -1,51 +0,0 @@
 import { BDom, text, VNode } from "./blockdom";
 const VText: any = text("").constructor;
 export class VPortal extends VText implements Partial<VNode<VPortal>> {
  //   selector: string;
  realBDom: BDom | null;
  target: HTMLElement | null = null;
  constructor(selector: string, realBDom: BDom, ownerComponent: ComponentNode) {
    super("");
    this.ownerComponent = ownerComponent;
    this.selector = selector;
    this.realBDom = realBDom;
  }
  mount(parent: HTMLElement, anchor: ChildNode) {
    super.mount(parent, anchor);
    this.ownerComponent.willDestroy.push(() => this.cleanup());
    this.target = document.querySelector(this.selector) as any;
    if (!this.target) {
      let el: any = this.el;
      while (el && el.parentElement instanceof HTMLElement) {
        el = el.parentElement;
      }
      this.target = el && el.querySelector(this.selector);
      if (!this.target) {
        throw new Error("invalid portal target");
      }
    }
    this.realBDom!.mount(this.target!, null);
  }
  beforeRemove() {
    this.realBDom!.beforeRemove();
  }
  remove() {
    super.remove();
    this.realBDom!.remove();
    this.realBDom = null;
  }
  patch(other: VPortal) {
    super.patch(other);
    if (this.realBDom) {
      this.realBDom.patch(other.realBDom!, true);
    } else {
      this.realBDom = other.realBDom;
      this.realBDom!.mount(this.target!, null);
    }
  }
 }
@@ -0,0 +1,342 @@
 import { CompilationContext } from "./compilation_context";
 import { QWeb } from "./qweb";
 import { htmlToVDOM } from "../vdom/html_to_vdom";
 /**
 * Owl QWeb Directives
 *
 * This file contains the implementation of most standard QWeb directives:
 * - t-esc
 * - t-raw
 * - t-set/t-value
 * - t-if/t-elif/t-else
 * - t-call
 * - t-foreach/t-as
 * - t-debug
 * - t-log
 */
 //------------------------------------------------------------------------------
 // t-esc and t-raw
 //------------------------------------------------------------------------------
 QWeb.utils.getFragment = function(str: string): DocumentFragment {
  const temp = document.createElement("template");
  temp.innerHTML = str;
  return temp.content;
 };
 QWeb.utils.htmlToVDOM = htmlToVDOM;
 function compileValueNode(value: any, node: Element, qweb: QWeb, ctx: CompilationContext) {
  if (value === "0") {
    const caller = ctx.getCaller();
    if (caller) {
      qweb._compileNode(caller, ctx.getInliningContext());
      return;
    }
  }
  if (value.xml instanceof NodeList && !value.id) {
    for (let node of Array.from(value.xml)) {
      qweb._compileNode(<ChildNode>node, ctx);
    }
    return;
  }
  let exprID: string;
  if (typeof value === "string") {
    exprID = `_${ctx.generateID()}`;
    ctx.addLine(`var ${exprID} = ${ctx.formatExpression(value)};`);
  } else {
    exprID = value.id;
  }
  ctx.addIf(`${exprID} || ${exprID} === 0`);
  if (ctx.escaping) {
    if (ctx.parentTextNode) {
      ctx.addLine(`vn${ctx.parentTextNode}.text += ${exprID};`);
    } else if (ctx.parentNode) {
      ctx.addLine(`c${ctx.parentNode}.push({text: ${exprID}});`);
    } else {
      let nodeID = ctx.generateID();
      ctx.rootContext.rootNode = nodeID;
      ctx.rootContext.parentTextNode = nodeID;
      ctx.addLine(`var vn${nodeID} = {text: ${exprID}};`);
      if (ctx.rootContext.shouldDefineResult) {
        ctx.addLine(`result = vn${nodeID}`);
      }
    }
  } else {
    ctx.rootContext.shouldDefineUtils = true;
    ctx.addLine(`c${ctx.parentNode}.push(...utils.htmlToVDOM(${exprID}));`);
  }
  if (node.childNodes.length) {
    ctx.addElse();
    qweb._compileChildren(node, ctx);
  }
  if (value.xml instanceof NodeList && value.id) {
    ctx.addElse();
    for (let node of Array.from(value.xml)) {
      qweb._compileNode(<ChildNode>node, ctx);
    }
  }
  ctx.closeIf();
 }
 QWeb.addDirective({
  name: "esc",
  priority: 70,
  atNodeEncounter({ node, qweb, ctx }): boolean {
    let value = ctx.getValue(node.getAttribute("t-esc")!);
    compileValueNode(value, node, qweb, ctx.subContext("escaping", true));
    return true;
  }
 });
 QWeb.addDirective({
  name: "raw",
  priority: 80,
  atNodeEncounter({ node, qweb, ctx }): boolean {
    let value = ctx.getValue(node.getAttribute("t-raw")!);
    compileValueNode(value, node, qweb, ctx);
    return true;
  }
 });
 //------------------------------------------------------------------------------
 // t-set
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "set",
  extraNames: ["value"],
  priority: 60,
  atNodeEncounter({ node, ctx }): boolean {
    const variable = node.getAttribute("t-set")!;
    let value = node.getAttribute("t-value")!;
    ctx.variables[variable] = ctx.variables[variable] || {};
    let qwebvar = ctx.variables[variable];
    if (value) {
      const formattedValue = ctx.formatExpression(value);
      if (ctx.variables.hasOwnProperty(variable) && qwebvar.id) {
        ctx.addLine(`${qwebvar.id} = ${formattedValue}`);
      } else {
        const varName = `_${ctx.generateID()}`;
        ctx.addLine(`var ${varName} = ${formattedValue};`);
        qwebvar.id = varName;
        qwebvar.expr = formattedValue;
      }
    } else {
      qwebvar.xml = node.childNodes;
    }
    return true;
  }
 });
 //------------------------------------------------------------------------------
 // t-if, t-elif, t-else
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "if",
  priority: 20,
  atNodeEncounter({ node, ctx }): boolean {
    let cond = ctx.getValue(node.getAttribute("t-if")!);
    ctx.addIf(typeof cond === "string" ? ctx.formatExpression(cond) : cond.id!);
    return false;
  },
  finalize({ ctx }) {
    ctx.closeIf();
  }
 });
 QWeb.addDirective({
  name: "elif",
  priority: 30,
  atNodeEncounter({ node, ctx }): boolean {
    let cond = ctx.getValue(node.getAttribute("t-elif")!);
    ctx.addLine(`else if (${typeof cond === "string" ? ctx.formatExpression(cond) : cond.id}) {`);
    ctx.indent();
    return false;
  },
  finalize({ ctx }) {
    ctx.closeIf();
  }
 });
 QWeb.addDirective({
  name: "else",
  priority: 40,
  atNodeEncounter({ ctx }): boolean {
    ctx.addLine(`else {`);
    ctx.indent();
    return false;
  },
  finalize({ ctx }) {
    ctx.closeIf();
  }
 });
 //------------------------------------------------------------------------------
 // t-call
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "call",
  priority: 50,
  atNodeEncounter({ node, qweb, ctx }): boolean {
    if (node.nodeName !== "t") {
      throw new Error("Invalid tag for t-call directive (should be 't')");
    }
    const subTemplate = node.getAttribute("t-call")!;
    const nodeTemplate = qweb.templates[subTemplate];
    if (!nodeTemplate) {
      throw new Error(`Cannot find template "${subTemplate}" (t-call)`);
    }
    const nodeCopy = node.cloneNode(true) as Element;
    nodeCopy.removeAttribute("t-call");
    // extract variables from nodecopy
    const tempCtx = new CompilationContext();
    tempCtx.allowMultipleRoots = true;
    qweb._compileNode(nodeCopy, tempCtx);
    const vars = Object.assign({}, ctx.variables, tempCtx.variables);
    const templateMap = Object.create(ctx.templates);
    // open new scope, if necessary
    const hasNewVariables = Object.keys(tempCtx.variables).length > 0;
    // compile sub template
    let subCtx = ctx.subContext("caller", nodeCopy).subContext("variables", Object.create(vars));
    subCtx = subCtx.subContext("templates", templateMap);
    if (templateMap[subTemplate]) {
      // OUCH, IT IS A RECURSIVE TEMPLATE SITUATION...
      // This is a tricky situation... We obviously cannot inline the compiled
      // template. So, what we need to do is to compile it, and make sure we
      // properly transfer everything from the current scope to the sub template.
      ctx.rootContext.shouldTrackScope = true;
      ctx.rootContext.shouldDefineOwner = true;
      let subTemplateName;
      if (ctx.hasParentWidget) {
        subTemplateName = ctx.templateName;
      } else {
        subTemplateName = `__${ctx.generateID()}`;
        subCtx.variables = {};
        let id = 0;
        for (let v in vars) {
          subCtx.variables[v] = vars[v];
          (vars[v] as any).id = `_v${id++}`;
        }
        const subTemplateFn = qweb._compile(subTemplateName, nodeTemplate.elem, subCtx);
        qweb.recursiveFns[subTemplateName] = subTemplateFn;
      }
      let varCode = `{}`;
      if (Object.keys(vars).length) {
        let id = 0;
        const content = Object.values(vars)
          .map((v: any) => `_v${id++}: ${v.expr}`)
          .join(",");
        varCode = `{${content}}`;
      }
      ctx.addLine(
        `this.recursiveFns['${subTemplateName}'].call(this, context, Object.assign({}, extra, {parentNode: c${ctx.parentNode}, fiber: {vars: ${varCode}, scope}}));`
      );
      return true;
    }
    templateMap[subTemplate] = true;
    if (hasNewVariables) {
      ctx.addLine("{");
      ctx.indent();
      // add new variables, if any
      for (let key in tempCtx.variables) {
        const v = tempCtx.variables[key];
        if (v.expr) {
          ctx.addLine(`let ${v.id} = ${v.expr};`);
        }
        // todo: handle XML variables...
      }
    }
    qweb._compileNode(nodeTemplate.elem, subCtx);
    // close new scope
    if (hasNewVariables) {
      ctx.dedent();
      ctx.addLine("}");
    }
    return true;
  }
 });
 //------------------------------------------------------------------------------
 // t-foreach
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "foreach",
  extraNames: ["as"],
  priority: 10,
  atNodeEncounter({ node, qweb, ctx }): boolean {
    ctx.rootContext.shouldProtectContext = true;
    ctx = ctx.subContext("loopNumber", ctx.loopNumber + 1);
    const elems = node.getAttribute("t-foreach")!;
    const name = node.getAttribute("t-as")!;
    let arrayID = ctx.generateID();
    ctx.addLine(`var _${arrayID} = ${ctx.formatExpression(elems)};`);
    ctx.addLine(`if (!_${arrayID}) { throw new Error('QWeb error: Invalid loop expression')}`);
    let keysID = ctx.generateID();
    let valuesID = ctx.generateID();
    ctx.addLine(`var _${keysID} = _${valuesID} = _${arrayID};`);
    ctx.addIf(`!(_${arrayID} instanceof Array)`);
    ctx.addLine(`_${keysID} = Object.keys(_${arrayID});`);
    ctx.addLine(`_${valuesID} = Object.values(_${arrayID});`);
    ctx.closeIf();
    ctx.addLine(`var _length${keysID} = _${keysID}.length;`);
    const loopVar = `i${ctx.loopNumber}`;
    ctx.addLine(`for (let ${loopVar} = 0; ${loopVar} < _length${keysID}; ${loopVar}++) {`);
    ctx.indent();
    ctx.addToScope(name + "_first", `${loopVar} === 0`);
    ctx.addToScope(name + "_last", `${loopVar} === _length${keysID} - 1`);
    ctx.addToScope(name + "_index", loopVar);
    ctx.addToScope(name, `_${keysID}[${loopVar}]`);
    ctx.addToScope(name + "_value", `_${valuesID}[${loopVar}]`);
    const nodeCopy = <Element>node.cloneNode(true);
    let shouldWarn =
      !nodeCopy.hasAttribute("t-key") &&
      node.children.length === 1 &&
      node.children[0].tagName !== "t" &&
      !node.children[0].hasAttribute("t-key");
    if (shouldWarn) {
      console.warn(
        `Directive t-foreach should always be used with a t-key! (in template: '${ctx.templateName}')`
      );
    }
    nodeCopy.removeAttribute("t-foreach");
    qweb._compileNode(nodeCopy, ctx);
    ctx.dedent();
    ctx.addLine("}");
    return true;
  }
 });
 //------------------------------------------------------------------------------
 // t-debug
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "debug",
  priority: 1,
  atNodeEncounter({ ctx }) {
    ctx.addLine("debugger;");
  }
 });
 //------------------------------------------------------------------------------
 // t-log
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "log",
  priority: 1,
  atNodeEncounter({ ctx, value }) {
    const expr = ctx.formatExpression(value);
    ctx.addLine(`console.log(${expr})`);
  }
 });
@@ -0,0 +1,228 @@
 import { compileExpr, QWebVar } from "./expression_parser";
 export const INTERP_REGEXP = /\{\{.*?\}\}/g;
 //------------------------------------------------------------------------------
 // Compilation Context
 //------------------------------------------------------------------------------
 export class CompilationContext {
  static nextID: number = 1;
  code: string[] = [];
  variables: { [key: string]: QWebVar } = {};
  escaping: boolean = false;
  parentNode: number | null = null;
  parentTextNode: number | null = null;
  rootNode: number | null = null;
  indentLevel: number = 0;
  rootContext: CompilationContext;
  caller: Element | undefined;
  shouldDefineOwner: boolean = false;
  shouldDefineParent: boolean = false;
  shouldDefineQWeb: boolean = false;
  shouldDefineUtils: boolean = false;
  shouldDefineRefs: boolean = false;
  shouldDefineResult: boolean = true;
  shouldProtectContext: boolean = false;
  shouldTrackScope: boolean = false;
  loopNumber: number = 0;
  inPreTag: boolean = false;
  templateName: string;
  allowMultipleRoots: boolean = false;
  hasParentWidget: boolean = false;
  scopeVars: any[] = [];
  currentKey: string = "";
  templates: { [key: string]: boolean } = {};
  callingLevel: number = 0;
  inliningLevel: number = 0;
  constructor(name?: string) {
    this.rootContext = this;
    this.templateName = name || "noname";
    this.templates[this.templateName] = true;
    this.addLine("var h = this.h;");
  }
  generateID(): number {
    return CompilationContext.nextID++;
  }
  /**
   * This method generates a "template key", which is basically a unique key
   * which depends on the currently set keys, and on the iteration numbers (if
   * we are in a loop).
   *
   * Such a key is necessary when we need to associate an id to some element
   * generated by a template (for example, a component)
   */
  generateTemplateKey(): string {
    const id = this.generateID();
    let locationExpr = `\`__${this.generateID()}__`;
    for (let i = 0; i < this.loopNumber - 1; i++) {
      locationExpr += `\${i${i + 1}}__`;
    }
    if (this.currentKey) {
      const k = this.currentKey;
      this.addLine(`let k${id} = ${locationExpr}\` + ${k};`);
    } else {
      locationExpr += this.loopNumber ? `\${i${this.loopNumber}}__\`` : "`";
      this.addLine(`let k${id} = ${locationExpr};`);
    }
    return `k${id}`;
  }
  generateCode(): string[] {
    const shouldTrackScope = this.shouldTrackScope && this.scopeVars.length;
    if (shouldTrackScope) {
      // add some vars to scope if needed
      for (let scopeVar of this.scopeVars.reverse()) {
        let { index, key, indent } = scopeVar;
        const prefix = new Array(indent + 2).join("    ");
        this.code.splice(index + 1, 0, prefix + `scope.${key} = context.${key};`);
      }
      this.code.unshift("    const scope = Object.create(null);");
    }
    if (this.shouldProtectContext) {
      this.code.unshift("    context = Object.create(context);");
    }
    if (this.shouldDefineResult) {
      this.code.unshift("    let result;");
    }
    if (this.shouldDefineRefs) {
      this.code.unshift("    context.__owl__.refs = context.__owl__.refs || {};");
    }
    if (this.shouldDefineOwner) {
      // this is necessary to prevent some directives (t-forach for ex) to
      // pollute the rendering context by adding some keys in it.
      this.code.unshift("    let owner = context;");
    }
    if (this.shouldDefineParent) {
      if (this.hasParentWidget) {
        this.code.unshift("    let parent = extra.parent;");
      } else {
        this.code.unshift("    let parent = context;");
      }
    }
    if (this.shouldDefineQWeb) {
      this.code.unshift("    let QWeb = this.constructor;");
    }
    if (this.shouldDefineUtils) {
      this.code.unshift("    let utils = this.constructor.utils;");
    }
    return this.code;
  }
  withParent(node: number): CompilationContext {
    if (
      !this.allowMultipleRoots &&
      this === this.rootContext &&
      (this.parentNode || this.parentTextNode)
    ) {
      throw new Error("A template should not have more than one root node");
    }
    if (!this.rootContext.rootNode) {
      this.rootContext.rootNode = node;
    }
    if (!this.parentNode && this.rootContext.shouldDefineResult) {
      this.addLine(`result = vn${node};`);
    }
    return this.subContext("parentNode", node);
  }
  subContext(key: keyof CompilationContext, value: any): CompilationContext {
    const newContext = Object.create(this);
    newContext[key] = value;
    if (key === "caller") {
      newContext.callingLevel++;
      newContext.inliningLevel++;
    }
    return newContext;
  }
  indent() {
    this.indentLevel++;
  }
  dedent() {
    this.indentLevel--;
  }
  addLine(line: string): number {
    const prefix = new Array(this.indentLevel + 2).join("    ");
    this.code.push(prefix + line);
    return this.code.length - 1;
  }
  addToScope(key: string, expr: string) {
    const index = this.addLine(`context.${key} = ${expr};`);
    this.rootContext.scopeVars.push({ index, key, indent: this.indentLevel });
  }
  addIf(condition: string) {
    this.addLine(`if (${condition}) {`);
    this.indent();
  }
  addElse() {
    this.dedent();
    this.addLine("} else {");
    this.indent();
  }
  closeIf() {
    this.dedent();
    this.addLine("}");
  }
  /**
   * Recursively (inverse) fetches the `caller` of a context
   * Useful to determine to which t-call a t-raw="0" refers
   */
  getCaller(targetLevel?: number): Element | null {
    if (targetLevel === undefined) {
      targetLevel = this.inliningLevel;
    }
    if (targetLevel === this.callingLevel) {
      return this.caller || null;
    }
    const proto = (this as any).__proto__;
    return proto ? proto.getCaller(targetLevel) : null;
  }
  /**
   * Marks the context with the current recursive level
   * in which we are for inlining archs (t-raw="0")
   */
  getInliningContext(): CompilationContext {
    return this.subContext("inliningLevel", this.inliningLevel - 1);
  }
  getValue(val: any): QWebVar | string {
    return val in this.variables ? this.getValue(this.variables[val]) : val;
  }
  /**
   * Prepare an expression for being consumed at render time.  Its main job
   * is to
   * - replace unknown variables by a lookup in the context
   * - replace already defined variables by their internal name
   */
  formatExpression(expr: string): string {
    return compileExpr(expr, this.variables);
  }
  /**
   * Perform string interpolation on the given string. Note that if the whole
   * string is an expression, it simply returns it (formatted and enclosed in
   * parentheses).
   * For instance:
   *   'Hello {{x}}!' -> `Hello ${x}`
   *   '{{x ? 'a': 'b'}}' -> (x ? 'a' : 'b')
   */
  interpolate(s: string): string {
    let matches = s.match(INTERP_REGEXP);
    if (matches && matches[0].length === s.length) {
      return `(${this.formatExpression(s.slice(2, -2))})`;
    }
    let r = s.replace(/\{\{.*?\}\}/g, s => "${" + this.formatExpression(s.slice(2, -2)) + "}");
    return "`" + r + "`";
  }
 }
@@ -25,25 +25,23 @@
 // Misc types, constants and helpers
 //------------------------------------------------------------------------------
-const RESERVED_WORDS =
+const RESERVED_WORDS = "true,false,NaN,null,undefined,debugger,console,window,in,instanceof,new,function,return,this,eval,void,Math,RegExp,Array,Object,Date".split(
-  "true,false,NaN,null,undefined,debugger,console,window,in,instanceof,new,function,return,this,eval,void,Math,RegExp,Array,Object,Date".split(
+  ","
-    ","
+);
  );
-const WORD_REPLACEMENT: { [key: string]: string } = Object.assign(Object.create(null), {
+const WORD_REPLACEMENT = {
  and: "&&",
  or: "||",
  gt: ">",
  gte: ">=",
  lt: "<",
-  lte: "<=",
+  lte: "<="
-});
+};
 export interface QWebVar {
-  id: string; // foo
+  id?: string;
-  expr: string; // scope.foo (local variables => only foo)
+  expr?: string;
-  value?: string; // 1 + 3
+  xml?: NodeList;
  hasBody?: boolean;
 }
 //------------------------------------------------------------------------------
@@ -58,7 +56,6 @@ type TKind =
  | "RIGHT_PAREN"
  | "COMMA"
  | "VALUE"
  | "TEMPLATE_STRING"
  | "SYMBOL"
  | "OPERATOR"
  | "COLON";
@@ -66,14 +63,10 @@ type TKind =
 interface Token {
  type: TKind;
  value: string;
  originalValue?: string;
  size?: number;
  varName?: string;
  replace?: Function;
  isLocal?: boolean;
 }
-const STATIC_TOKEN_MAP: { [key: string]: TKind } = Object.assign(Object.create(null), {
+const STATIC_TOKEN_MAP: { [key: string]: TKind } = {
  "{": "LEFT_BRACE",
  "}": "RIGHT_BRACE",
  "[": "LEFT_BRACKET",
@@ -81,19 +74,19 @@ const STATIC_TOKEN_MAP: { [key: string]: TKind } = Object.assign(Object.create(n
  ":": "COLON",
  ",": "COMMA",
  "(": "LEFT_PAREN",
-  ")": "RIGHT_PAREN",
+  ")": "RIGHT_PAREN"
-});
+};
 // note that the space after typeof is relevant. It makes sure that the formatted
 // expression has a space after typeof
-const OPERATORS = "...,.,===,==,+,!==,!=,!,||,&&,>=,>,<=,<,?,-,*,/,%,typeof ,=>,=,;,in ".split(",");
+const OPERATORS = ".,===,==,+,!==,!=,!,||,&&,>=,>,<=,<,?,-,*,/,%,typeof ".split(",");
 type Tokenizer = (expr: string) => Token | false;
-let tokenizeString: Tokenizer = function (expr) {
+let tokenizeString: Tokenizer = function(expr) {
  let s = expr[0];
  let start = s;
-  if (s !== "'" && s !== '"' && s !== "`") {
+  if (s !== "'" && s !== '"') {
    return false;
  }
  let i = 1;
@@ -115,21 +108,10 @@ let tokenizeString: Tokenizer = function (expr) {
    throw new Error("Invalid expression");
  }
  s += start;
  if (start === "`") {
    return {
      type: "TEMPLATE_STRING",
      value: s,
      replace(replacer: any) {
        return s.replace(/\$\{(.*?)\}/g, (match, group) => {
          return "${" + replacer(group) + "}";
        });
      },
    };
  }
  return { type: "VALUE", value: s };
 };
-let tokenizeNumber: Tokenizer = function (expr) {
+let tokenizeNumber: Tokenizer = function(expr) {
  let s = expr[0];
  if (s && s.match(/[0-9]/)) {
    let i = 1;
@@ -143,7 +125,7 @@ let tokenizeNumber: Tokenizer = function (expr) {
  }
 };
-let tokenizeSymbol: Tokenizer = function (expr) {
+let tokenizeSymbol: Tokenizer = function(expr) {
  let s = expr[0];
  if (s && s.match(/[a-zA-Z_\$]/)) {
    let i = 1;
@@ -160,7 +142,7 @@ let tokenizeSymbol: Tokenizer = function (expr) {
  }
 };
-const tokenizeStatic: Tokenizer = function (expr) {
+const tokenizeStatic: Tokenizer = function(expr) {
  const char = expr[0];
  if (char && char in STATIC_TOKEN_MAP) {
    return { type: STATIC_TOKEN_MAP[char], value: char };
@@ -168,7 +150,7 @@ const tokenizeStatic: Tokenizer = function (expr) {
  return false;
 };
-const tokenizeOperator: Tokenizer = function (expr) {
+const tokenizeOperator: Tokenizer = function(expr) {
  for (let op of OPERATORS) {
    if (expr.startsWith(op)) {
      return { type: "OPERATOR", value: op };
@@ -182,7 +164,7 @@ const TOKENIZERS = [
  tokenizeNumber,
  tokenizeOperator,
  tokenizeSymbol,
-  tokenizeStatic,
+  tokenizeStatic
 ];
 /**
@@ -225,11 +207,6 @@ export function tokenize(expr: string): Token[] {
 // Expression "evaluator"
 //------------------------------------------------------------------------------
 const isLeftSeparator = (token: Token) =>
  token && (token.type === "LEFT_BRACE" || token.type === "COMMA");
 const isRightSeparator = (token: Token) =>
  token && (token.type === "RIGHT_BRACE" || token.type === "COMMA");
 /**
 * This is the main function exported by this file. This is the code that will
 * process an expression (given as a string) and returns another expression with
@@ -250,107 +227,35 @@ const isRightSeparator = (token: Token) =>
 * - unless the previous token is a dot (in that case, this is a property: `a.b`)
 * - or if the previous token is a left brace or a comma, and the next token is
 *   a colon (in that case, this is an object key: `{a: b}`)
 *
 * Some specific code is also required to support arrow functions. If we detect
 * the arrow operator, then we add the current (or some previous tokens) token to
 * the list of variables so it does not get replaced by a lookup in the context
 */
-export function compileExprToArray(expr: string): Token[] {
+export function compileExpr(expr: string, vars: { [key: string]: QWebVar }): string {
  const localVars = new Set<string>();
  const tokens = tokenize(expr);
-  let i = 0;
+  let result = "";
-  let stack = []; // to track last opening [ or {
+  for (let i = 0; i < tokens.length; i++) {
  while (i < tokens.length) {
    let token = tokens[i];
    let prevToken = tokens[i - 1];
    let nextToken = tokens[i + 1];
    let groupType = stack[stack.length - 1];
    switch (token.type) {
      case "LEFT_BRACE":
      case "LEFT_BRACKET":
        stack.push(token.type);
        break;
      case "RIGHT_BRACE":
      case "RIGHT_BRACKET":
        stack.pop();
    }
    let isVar = token.type === "SYMBOL" && !RESERVED_WORDS.includes(token.value);
    if (token.type === "SYMBOL" && !RESERVED_WORDS.includes(token.value)) {
      // we need to find if it is a variable
      let isVar = true;
      let prevToken = tokens[i - 1];
      if (prevToken) {
        // normalize missing tokens: {a} should be equivalent to {a:a}
        if (
          groupType === "LEFT_BRACE" &&
          isLeftSeparator(prevToken) &&
          isRightSeparator(nextToken)
        ) {
          tokens.splice(i + 1, 0, { type: "COLON", value: ":" }, { ...token });
          nextToken = tokens[i + 1];
        }
        if (prevToken.type === "OPERATOR" && prevToken.value === ".") {
          isVar = false;
        } else if (prevToken.type === "LEFT_BRACE" || prevToken.type === "COMMA") {
          let nextToken = tokens[i + 1];
          if (nextToken && nextToken.type === "COLON") {
            isVar = false;
          }
        }
      }
-    }
+      if (isVar) {
-    if (token.type === "TEMPLATE_STRING") {
+        if (token.value in vars && "id" in vars[token.value]) {
-      token.value = token.replace!((expr: any) => compileExpr(expr));
+          token.value = vars[token.value].id!;
-    }
+        } else {
-    if (nextToken && nextToken.type === "OPERATOR" && nextToken.value === "=>") {
+          token.value = `context['${token.value}']`;
      if (token.type === "RIGHT_PAREN") {
        let j = i - 1;
        while (j > 0 && tokens[j].type !== "LEFT_PAREN") {
          if (tokens[j].type === "SYMBOL" && tokens[j].originalValue) {
            tokens[j].value = tokens[j].originalValue!;
            localVars.add(tokens[j].value); //] = { id: tokens[j].value, expr: tokens[j].value };
          }
          j--;
        }
      } else {
        localVars.add(token.value); //] = { id: token.value, expr: token.value };
      }
    }
-
+    result += token.value;
    if (isVar) {
      token.varName = token.value;
      if (!localVars.has(token.value)) {
        token.originalValue = token.value;
        token.value = `ctx['${token.value}']`;
      }
    }
    i++;
  }
-  // Mark all variables that have been used locally.
+  return result;
  // This assumes the expression has only one scope (incorrect but "good enough for now")
  for (const token of tokens) {
    if (token.type === "SYMBOL" && localVars.has(token.value)) {
      token.isLocal = true;
    }
  }
  return tokens;
 }
 export function compileExpr(expr: string): string {
  return compileExprToArray(expr)
    .map((t) => t.value)
    .join("");
 }
 export const INTERP_REGEXP = /\{\{.*?\}\}/g;
 const INTERP_GROUP_REGEXP = /\{\{.*?\}\}/g;
 export function interpolate(s: string): string {
  let matches = s.match(INTERP_REGEXP);
  if (matches && matches[0].length === s.length) {
    return `(${compileExpr(s.slice(2, -2))})`;
  }
  let r = s.replace(INTERP_GROUP_REGEXP, (s) => "${" + compileExpr(s.slice(2, -2)) + "}");
  return "`" + r + "`";
 }
@@ -0,0 +1,289 @@
 import { VNode } from "../vdom/index";
 import { QWeb } from "./qweb";
 /**
 * Owl QWeb Extensions
 *
 * This file contains the implementation of non standard QWeb directives, added
 * by Owl and that will only work on Owl projects:
 *
 * - t-on
 * - t-ref
 * - t-transition
 * - t-mounted
 * - t-slot
 * - t-model
 */
 //------------------------------------------------------------------------------
 // t-on
 //------------------------------------------------------------------------------
 // these are pieces of code that will be injected into the event handler if
 // modifiers are specified
 export const MODS_CODE = {
  prevent: "e.preventDefault();",
  self: "if (e.target !== this.elm) {return}",
  stop: "e.stopPropagation();"
 };
 QWeb.addDirective({
  name: "on",
  priority: 90,
  atNodeCreation({ ctx, fullName, value, nodeID }) {
    ctx.rootContext.shouldDefineOwner = true;
    const [eventName, ...mods] = fullName.slice(5).split(".");
    if (!eventName) {
      throw new Error("Missing event name with t-on directive");
    }
    let extraArgs;
    let handlerName = value.replace(/\(.*\)/, function(args) {
      extraArgs = args.slice(1, -1);
      return "";
    });
    let params = extraArgs ? `owner, ${ctx.formatExpression(extraArgs)}` : "owner";
    let handler = `function (e) {`;
    handler += mods
      .map(function(mod) {
        return MODS_CODE[mod];
      })
      .join("");
    if (handlerName) {
      if (!extraArgs) {
        handler += `const fn = context['${handlerName}'];`;
        handler += `if (fn) { fn.call(${params}, e); } else { context.${handlerName}; }`;
        handler += `}`;
        ctx.addLine(
          `extra.handlers['${eventName}' + ${nodeID}] = extra.handlers['${eventName}' + ${nodeID}] || ${handler};`
        );
        ctx.addLine(`p${nodeID}.on['${eventName}'] = extra.handlers['${eventName}' + ${nodeID}];`);
      } else {
        const handlerKey = `handler${ctx.generateID()}`;
        ctx.addLine(
          `const ${handlerKey} = context['${handlerName}'] && context['${handlerName}'].bind(${params});`
        );
        handler += `if (${handlerKey}) { ${handlerKey}(e); } else { context.${value}; }`;
        handler += `}`;
        ctx.addLine(`p${nodeID}.on['${eventName}'] = ${handler};`);
      }
    } else {
      handler += "}";
      ctx.addLine(`p${nodeID}.on['${eventName}'] = ${handler};`);
    }
  }
 });
 //------------------------------------------------------------------------------
 // t-ref
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "ref",
  priority: 95,
  atNodeCreation({ ctx, value, addNodeHook }) {
    ctx.rootContext.shouldDefineRefs = true;
    const refKey = `ref${ctx.generateID()}`;
    ctx.addLine(`const ${refKey} = ${ctx.interpolate(value)};`);
    addNodeHook("create", `context.__owl__.refs[${refKey}] = n.elm;`);
    addNodeHook("destroy", `delete context.__owl__.refs[${refKey}];`);
  }
 });
 //------------------------------------------------------------------------------
 // t-transition
 //------------------------------------------------------------------------------
 QWeb.utils.nextFrame = function(cb: () => void) {
  requestAnimationFrame(() => requestAnimationFrame(cb));
 };
 QWeb.utils.transitionInsert = function(vn: VNode, name: string) {
  const elm = <HTMLElement>vn.elm;
  // remove potential duplicated vnode that is currently being removed, to
  // prevent from having twice the same node in the DOM during an animation
  const dup = elm.parentElement && elm.parentElement!.querySelector(`*[data-owl-key='${vn.key}']`);
  if (dup) {
    dup.remove();
  }
  elm.classList.add(name + "-enter");
  elm.classList.add(name + "-enter-active");
  elm.classList.remove(name + "-leave-active");
  elm.classList.remove(name + "-leave-to");
  const finalize = () => {
    elm.classList.remove(name + "-enter-active");
    elm.classList.remove(name + "-enter-to");
  };
  this.nextFrame(() => {
    elm.classList.remove(name + "-enter");
    elm.classList.add(name + "-enter-to");
    whenTransitionEnd(elm, finalize);
  });
 };
 QWeb.utils.transitionRemove = function(vn: VNode, name: string, rm: () => void) {
  const elm = <HTMLElement>vn.elm;
  elm.setAttribute("data-owl-key", vn.key!);
  elm.classList.add(name + "-leave");
  elm.classList.add(name + "-leave-active");
  const finalize = () => {
    if (!elm.classList.contains(name + "-leave-active")) {
      return;
    }
    elm.classList.remove(name + "-leave-active");
    elm.classList.remove(name + "-leave-to");
    rm();
  };
  this.nextFrame(() => {
    elm.classList.remove(name + "-leave");
    elm.classList.add(name + "-leave-to");
    whenTransitionEnd(elm, finalize);
  });
 };
 function getTimeout(delays: Array<string>, durations: Array<string>): number {
  /* istanbul ignore next */
  while (delays.length < durations.length) {
    delays = delays.concat(delays);
  }
  return Math.max.apply(
    null,
    durations.map((d, i) => {
      return toMs(d) + toMs(delays[i]);
    })
  );
 }
 // Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers
 // in a locale-dependent way, using a comma instead of a dot.
 // If comma is not replaced with a dot, the input will be rounded down (i.e. acting
 // as a floor function) causing unexpected behaviors
 function toMs(s: string): number {
  return Number(s.slice(0, -1).replace(",", ".")) * 1000;
 }
 function whenTransitionEnd(elm: HTMLElement, cb) {
  const styles = window.getComputedStyle(elm);
  const delays: Array<string> = (styles.transitionDelay || "").split(", ");
  const durations: Array<string> = (styles.transitionDuration || "").split(", ");
  const timeout: number = getTimeout(delays, durations);
  if (timeout > 0) {
    elm.addEventListener("transitionend", cb, { once: true });
  } else {
    cb();
  }
 }
 QWeb.addDirective({
  name: "transition",
  priority: 96,
  atNodeCreation({ ctx, value, addNodeHook }) {
    ctx.rootContext.shouldDefineUtils = true;
    let name = value;
    const hooks = {
      insert: `utils.transitionInsert(vn, '${name}');`,
      remove: `utils.transitionRemove(vn, '${name}', rm);`
    };
    for (let hookName in hooks) {
      addNodeHook(hookName, hooks[hookName]);
    }
  }
 });
 //------------------------------------------------------------------------------
 // t-slot
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "slot",
  priority: 80,
  atNodeEncounter({ ctx, value }): boolean {
    const slotKey = ctx.generateID();
    ctx.rootContext.shouldDefineOwner = true;
    ctx.addLine(
      `const slot${slotKey} = this.constructor.slots[context.__owl__.slotId + '_' + '${value}'];`
    );
    ctx.addIf(`slot${slotKey}`);
    let parentNode = `c${ctx.parentNode}`;
    if (!ctx.parentNode) {
      ctx.rootContext.shouldDefineResult = true;
      ctx.rootContext.shouldDefineUtils = true;
      parentNode = `children${ctx.generateID()}`;
      ctx.addLine(`let ${parentNode}= []`);
      ctx.addLine(`result = {}`);
    }
    ctx.addLine(
      `slot${slotKey}.call(this, context.__owl__.parent, Object.assign({}, extra, {parentNode: ${parentNode}, vars: extra.vars, parent: extra.parent || owner}));`
    );
    if (!ctx.parentNode) {
      ctx.addLine(`utils.defineProxy(result, ${parentNode}[0]);`);
    }
    ctx.closeIf();
    return true;
  }
 });
 //------------------------------------------------------------------------------
 // t-model
 //------------------------------------------------------------------------------
 QWeb.utils.toNumber = function(val: string): number | string {
  const n = parseFloat(val);
  return isNaN(n) ? val : n;
 };
 QWeb.addDirective({
  name: "model",
  priority: 42,
  atNodeCreation({ ctx, nodeID, value, node, fullName, addNodeHook }) {
    const type = node.getAttribute("type");
    let handler;
    let event = fullName.includes(".lazy") ? "change" : "input";
    // we keep here a reference to the "base expression" (if the expression
    // is `t-model="some.expr.value", then the base expression is "some.expr").
    // This is necessary so we can capture it in the handler closure.
    let expr = ctx.formatExpression(value);
    const index = expr.lastIndexOf(".");
    const baseExpr = expr.slice(0, index);
    ctx.addLine(`let expr${nodeID} = ${baseExpr};`);
    expr = `expr${nodeID}.${expr.slice(index + 1)}`;
    const key = ctx.generateTemplateKey();
    if (node.tagName === "select") {
      ctx.addLine(`p${nodeID}.props = {value: ${expr}};`);
      addNodeHook("create", `n.elm.value=${expr};`);
      event = "change";
      handler = `(ev) => {${expr} = ev.target.value}`;
    } else if (type === "checkbox") {
      ctx.addLine(`p${nodeID}.props = {checked: ${expr}};`);
      handler = `(ev) => {${expr} = ev.target.checked}`;
    } else if (type === "radio") {
      const nodeValue = node.getAttribute("value")!;
      ctx.addLine(`p${nodeID}.props = {checked:${expr} === '${nodeValue}'};`);
      handler = `(ev) => {${expr} = ev.target.value}`;
      event = "click";
    } else {
      ctx.addLine(`p${nodeID}.props = {value: ${expr}};`);
      const trimCode = fullName.includes(".trim") ? ".trim()" : "";
      let valueCode = `ev.target.value${trimCode}`;
      if (fullName.includes(".number")) {
        ctx.rootContext.shouldDefineUtils = true;
        valueCode = `utils.toNumber(${valueCode})`;
      }
      handler = `(ev) => {${expr} = ${valueCode}}`;
    }
    ctx.addLine(`extra.handlers[${key}] = extra.handlers[${key}] || (${handler});`);
    ctx.addLine(`p${nodeID}.on['${event}'] = extra.handlers[${key}];`);
  }
 });
 //------------------------------------------------------------------------------
 // t-key
 //------------------------------------------------------------------------------
 QWeb.addDirective({
  name: "key",
  priority: 45,
  atNodeEncounter({ ctx, value }) {
    let id = ctx.generateID();
    ctx.addLine(`const nodeKey${id} = ${ctx.formatExpression(value)};`);
    ctx.currentKey = `nodeKey${id}`;
  }
 });
@@ -0,0 +1,4 @@
 import "./base_directives";
 import "./extensions";
 export { CompiledTemplate, QWeb } from "./qweb";
@@ -0,0 +1,775 @@
 import { EventBus } from "../core/event_bus";
 import { h, patch, VNode } from "../vdom/index";
 import { CompilationContext } from "./compilation_context";
 import { shallowEqual } from "../utils";
 import { addNS } from "../vdom/vdom";
 /**
 * Owl QWeb Engine
 *
 * In this file, you will find a QWeb engine/template compiler.  It is the core
 * of how Owl component works.
 *
 * Briefly, Owl QWeb compiles XML templates into functions that output a virtual
 * DOM representation.
 *
 * We have here:
 * - a CompilationContext class, which is an internal object that contains all
 *   compilation specific information, while a template is being compiled.
 * - a QWeb class: this is the code of the QWeb compiler.
 *
 * Note that this file does not contain the implementation of the QWeb
 * directives (see qweb_directives.ts and qweb_extensions.ts).
 */
 //------------------------------------------------------------------------------
 // Types
 //------------------------------------------------------------------------------
 export type EvalContext = { [key: string]: any };
 export type CompiledTemplate = (context: EvalContext, extra: any) => VNode;
 interface Template {
  elem: Element;
  fn: CompiledTemplate;
 }
 interface CompilationInfo {
  node: Element;
  qweb: QWeb;
  ctx: CompilationContext;
  fullName: string;
  value: string;
 }
 interface NodeCreationCompilationInfo extends CompilationInfo {
  nodeID: number;
  addNodeHook: Function;
 }
 export interface Directive {
  name: string;
  extraNames?: string[];
  priority: number;
  // if return true, then directive is fully applied and there is no need to
  // keep processing node. Otherwise, we keep going.
  atNodeEncounter?(info: CompilationInfo): boolean | void;
  atNodeCreation?(info: NodeCreationCompilationInfo): void;
  finalize?(info: CompilationInfo): void;
 }
 interface QWebConfig {
  templates?: string;
  translateFn?(text: string): string;
 }
 //------------------------------------------------------------------------------
 // Const/global stuff/helpers
 //------------------------------------------------------------------------------
 const DISABLED_TAGS = ["input", "textarea", "button", "select", "option", "optgroup"];
 const TRANSLATABLE_ATTRS = ["label", "title", "placeholder", "alt"];
 const lineBreakRE = /[\r\n]/;
 const whitespaceRE = /\s+/g;
 const NODE_HOOKS_PARAMS = {
  create: "(_, n)",
  insert: "vn",
  remove: "(vn, rm)",
  destroy: "()"
 };
 interface Utils {
  toObj(expr: any): Object;
  shallowEqual(p1: Object, p2: Object): boolean;
  [key: string]: any;
 }
 const UTILS: Utils = {
  toObj(expr) {
    if (typeof expr === "string") {
      expr = expr.trim();
      if (!expr) {
        return {};
      }
      let words = expr.split(/\s+/);
      let result = {};
      for (let i = 0; i < words.length; i++) {
        result[words[i]] = true;
      }
      return result;
    }
    return expr;
  },
  shallowEqual,
  addNameSpace(vnode) {
    addNS(vnode.data, vnode.children, vnode.sel);
  }
 };
 function parseXML(xml: string): Document {
  const parser = new DOMParser();
  const doc = parser.parseFromString(xml, "text/xml");
  if (doc.getElementsByTagName("parsererror").length) {
    let msg = "Invalid XML in template.";
    const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
    if (parsererrorText) {
      msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
      const re = /\d+/g;
      const firstMatch = re.exec(parsererrorText);
      if (firstMatch) {
        const lineNumber = Number(firstMatch[0]);
        const line = xml.split("\n")[lineNumber - 1];
        const secondMatch = re.exec(parsererrorText);
        if (line && secondMatch) {
          const columnIndex = Number(secondMatch[0]) - 1;
          if (line[columnIndex]) {
            msg +=
              `\nThe error might be located at xml line ${lineNumber} column ${columnIndex}\n` +
              `${line}\n${"-".repeat(columnIndex - 1)}^`;
          }
        }
      }
    }
    throw new Error(msg);
  }
  return doc;
 }
 //------------------------------------------------------------------------------
 // QWeb rendering engine
 //------------------------------------------------------------------------------
 export class QWeb extends EventBus {
  templates: { [name: string]: Template };
  static utils = UTILS;
  static components = Object.create(null);
  static DIRECTIVE_NAMES: { [key: string]: 1 } = {
    name: 1,
    att: 1,
    attf: 1,
    translation: 1
  };
  static DIRECTIVES: Directive[] = [];
  static TEMPLATES: { [name: string]: Template } = {};
  static nextId: number = 1;
  h = h;
  // dev mode enables better error messages or more costly validations
  static dev: boolean = false;
  // slots contains sub templates defined with t-set inside t-component nodes, and
  // are meant to be used by the t-slot directive.
  static slots = {};
  static nextSlotId = 1;
  // recursiveTemplates contains sub templates called with t-call, but which
  // ends up in recursive situations.  This is very similar to the slot situation,
  // as in we need to propagate the scope.
  recursiveFns = {};
  isUpdating: boolean = false;
  translateFn?: QWebConfig["translateFn"];
  constructor(config: QWebConfig = {}) {
    super();
    this.templates = Object.create(QWeb.TEMPLATES);
    if (config.templates) {
      this.addTemplates(config.templates);
    }
    if (config.translateFn) {
      this.translateFn = config.translateFn;
    }
  }
  static addDirective(directive: Directive) {
    if (directive.name in QWeb.DIRECTIVE_NAMES) {
      throw new Error(`Directive "${directive.name} already registered`);
    }
    QWeb.DIRECTIVES.push(directive);
    QWeb.DIRECTIVE_NAMES[directive.name] = 1;
    QWeb.DIRECTIVES.sort((d1, d2) => d1.priority - d2.priority);
    if (directive.extraNames) {
      directive.extraNames.forEach(n => (QWeb.DIRECTIVE_NAMES[n] = 1));
    }
  }
  static registerComponent(name: string, Component: any) {
    if (QWeb.components[name]) {
      throw new Error(`Component '${name}' has already been registered`);
    }
    QWeb.components[name] = Component;
  }
  /**
   * Register globally a template.  All QWeb instances will obtain their
   * templates from their own template map, and then, from the global static
   * TEMPLATES property.
   */
  static registerTemplate(name: string, template: string) {
    if (QWeb.TEMPLATES[name]) {
      throw new Error(`Template '${name}' has already been registered`);
    }
    const qweb = new QWeb();
    qweb.addTemplate(name, template);
    QWeb.TEMPLATES[name] = qweb.templates[name];
  }
  /**
   * Add a template to the internal template map.  Note that it is not
   * immediately compiled.
   */
  addTemplate(name: string, xmlString: string, allowDuplicate?: boolean) {
    if (allowDuplicate && name in this.templates) {
      return;
    }
    const doc = parseXML(xmlString);
    if (!doc.firstChild) {
      throw new Error("Invalid template (should not be empty)");
    }
    this._addTemplate(name, <Element>doc.firstChild);
  }
  /**
   * Load templates from a xml (as a string or xml document).  This will look up
   * for the first <templates> tag, and will consider each child of this as a
   * template, with the name given by the t-name attribute.
   */
  addTemplates(xmlstr: string | Document) {
    const doc = typeof xmlstr === "string" ? parseXML(xmlstr) : xmlstr;
    const templates = doc.getElementsByTagName("templates")[0];
    if (!templates) {
      return;
    }
    for (let elem of <any>templates.children) {
      const name = elem.getAttribute("t-name");
      this._addTemplate(name, elem);
    }
  }
  _addTemplate(name: string, elem: Element) {
    if (name in this.templates) {
      throw new Error(`Template ${name} already defined`);
    }
    this._processTemplate(elem);
    const template = {
      elem,
      fn: function(this: QWeb, context, extra) {
        const compiledFunction = this._compile(name, elem);
        template.fn = compiledFunction;
        return compiledFunction.call(this, context, extra);
      }
    };
    this.templates[name] = template;
  }
  _processTemplate(elem: Element) {
    let tbranch = elem.querySelectorAll("[t-elif], [t-else]");
    for (let i = 0, ilen = tbranch.length; i < ilen; i++) {
      let node = tbranch[i];
      let prevElem = node.previousElementSibling!;
      let pattr = function(name) {
        return prevElem.getAttribute(name);
      };
      let nattr = function(name) {
        return +!!node.getAttribute(name);
      };
      if (prevElem && (pattr("t-if") || pattr("t-elif"))) {
        if (pattr("t-foreach")) {
          throw new Error(
            "t-if cannot stay at the same level as t-foreach when using t-elif or t-else"
          );
        }
        if (
          ["t-if", "t-elif", "t-else"].map(nattr).reduce(function(a, b) {
            return a + b;
          }) > 1
        ) {
          throw new Error("Only one conditional branching directive is allowed per node");
        }
        // All text nodes between branch nodes are removed
        let textNode;
        while ((textNode = node.previousSibling) !== prevElem) {
          if (textNode.nodeValue.trim().length) {
            throw new Error("text is not allowed between branching directives");
          }
          textNode.remove();
        }
      } else {
        throw new Error(
          "t-elif and t-else directives must be preceded by a t-if or t-elif directive"
        );
      }
    }
  }
  /**
   * Render a template
   *
   * @param {string} name the template should already have been added
   */
  render(name: string, context: EvalContext = {}, extra: any = null): VNode {
    const template = this.templates[name];
    if (!template) {
      throw new Error(`Template ${name} does not exist`);
    }
    return template.fn.call(this, context, extra);
  }
  /**
   * Render a template to a html string.
   *
   * Note that this is more limited than the `render` method: it is not suitable
   * to render a full component tree, since this is an asynchronous operation.
   * This method can only render templates without components.
   */
  renderToString(name: string, context: EvalContext = {}, extra?: any): string {
    const vnode = this.render(name, context, extra);
    if (vnode.sel === undefined) {
      return vnode.text!;
    }
    const node = document.createElement(vnode.sel);
    const result = patch(node, vnode);
    return (<HTMLElement>result.elm).outerHTML;
  }
  /**
   * Force all widgets connected to this QWeb instance to rerender themselves.
   *
   * This method is mostly useful for external code that want to modify the
   * application in some cases.  For example, a router plugin.
   */
  forceUpdate() {
    this.isUpdating = true;
    Promise.resolve().then(() => {
      if (this.isUpdating) {
        this.isUpdating = false;
        this.trigger("update");
      }
    });
  }
  _compile(name: string, elem: Element, parentContext?: CompilationContext): CompiledTemplate {
    const isDebug = elem.attributes.hasOwnProperty("t-debug");
    const ctx = new CompilationContext(name);
    if (elem.tagName !== "t") {
      ctx.shouldDefineResult = false;
    }
    if (parentContext) {
      ctx.templates = Object.create(parentContext.templates);
      ctx.variables = Object.create(parentContext.variables);
      ctx.parentNode = parentContext.parentNode || ctx.generateID();
      ctx.allowMultipleRoots = true;
      ctx.hasParentWidget = true;
      ctx.shouldDefineResult = false;
      ctx.addLine(`let c${ctx.parentNode} = extra.parentNode;`);
      for (let v in parentContext.variables) {
        let variable = <any>parentContext.variables[v];
        if (variable.id) {
          ctx.addLine(`let ${variable.id} = extra.fiber.vars.${variable.id}`);
        }
      }
    }
    if (parentContext) {
      ctx.addLine("    Object.assign(context, extra.fiber.scope);");
    }
    this._compileNode(elem, ctx);
    if (!parentContext) {
      if (ctx.shouldDefineResult) {
        ctx.addLine(`return result;`);
      } else {
        if (!ctx.rootNode) {
          throw new Error(`A template should have one root node (${ctx.templateName})`);
        }
        ctx.addLine(`return vn${ctx.rootNode};`);
      }
    }
    let code = ctx.generateCode();
    let template;
    try {
      template = new Function("context", "extra", code.join("\n")) as CompiledTemplate;
    } catch (e) {
      const templateName = ctx.templateName.replace(/`/g, "'");
      console.groupCollapsed(`Invalid Code generated by ${templateName}`);
      console.warn(code.join("\n"));
      console.groupEnd();
      throw new Error(
        `Invalid generated code while compiling template '${templateName}': ${e.message}`
      );
    }
    if (isDebug) {
      const tpl = this.templates[name];
      if (tpl) {
        const msg = `Template: ${tpl.elem.outerHTML}\nCompiled code:\n${template.toString()}`;
        console.log(msg);
      }
    }
    return template;
  }
  /**
   * Generate code from an xml node
   *
   */
  _compileNode(node: ChildNode, ctx: CompilationContext) {
    if (!(node instanceof Element)) {
      // this is a text node, there are no directive to apply
      let text = node.textContent!;
      if (!ctx.inPreTag) {
        if (lineBreakRE.test(text) && !text.trim()) {
          return;
        }
        text = text.replace(whitespaceRE, " ");
      }
      if (this.translateFn) {
        if ((node.parentNode as any).getAttribute("t-translation") !== "off") {
          text = this.translateFn(text);
        }
      }
      if (ctx.parentNode) {
        if (node.nodeType === 3) {
          ctx.addLine(`c${ctx.parentNode}.push({text: \`${text}\`});`);
        } else if (node.nodeType === 8) {
          ctx.addLine(`c${ctx.parentNode}.push(h('!', \`${text}\`));`);
        }
      } else if (ctx.parentTextNode) {
        ctx.addLine(`vn${ctx.parentTextNode}.text += \`${text}\`;`);
      } else {
        // this is an unusual situation: this text node is the result of the
        // template rendering.
        let nodeID = ctx.generateID();
        ctx.addLine(`var vn${nodeID} = {text: \`${text}\`};`);
        ctx.addLine(`result = vn${nodeID};`);
        ctx.rootContext.rootNode = nodeID;
        ctx.rootContext.parentTextNode = nodeID;
      }
      return;
    }
    if (ctx !== ctx.rootContext) {
      ctx = ctx.subContext("currentKey", ctx.currentKey);
    }
    const firstLetter = node.tagName[0];
    if (firstLetter === firstLetter.toUpperCase()) {
      // this is a component, we modify in place the xml document to change
      // <SomeComponent ... /> to <t t-component="SomeComponent" ... />
      node.setAttribute("t-component", node.tagName);
    } else if (node.tagName !== "t" && node.hasAttribute("t-component")) {
      throw new Error(
        `Directive 't-component' can only be used on <t> nodes (used on a <${node.tagName}>)`
      );
    }
    const attributes = (<Element>node).attributes;
    const validDirectives: {
      directive: Directive;
      value: string;
      fullName: string;
    }[] = [];
    const finalizers: typeof validDirectives = [];
    // maybe this is not optimal: we iterate on all attributes here, and again
    // just after for each directive.
    for (let i = 0; i < attributes.length; i++) {
      let attrName = attributes[i].name;
      if (attrName.startsWith("t-")) {
        let dName = attrName.slice(2).split(/-|\./)[0];
        if (!(dName in QWeb.DIRECTIVE_NAMES)) {
          throw new Error(`Unknown QWeb directive: '${attrName}'`);
        }
        if (node.tagName !== "t" && (attrName === "t-esc" || attrName === "t-raw")) {
          const tNode = document.createElement("t");
          tNode.setAttribute(attrName, node.getAttribute(attrName)!);
          for (let child of Array.from(node.childNodes)) {
            tNode.appendChild(child);
          }
          node.appendChild(tNode);
          node.removeAttribute(attrName);
        }
      }
    }
    const DIR_N = QWeb.DIRECTIVES.length;
    const ATTR_N = attributes.length;
    let withHandlers = false;
    for (let i = 0; i < DIR_N; i++) {
      let directive = QWeb.DIRECTIVES[i];
      let fullName;
      let value;
      for (let j = 0; j < ATTR_N; j++) {
        const name = attributes[j].name;
        if (
          name === "t-" + directive.name ||
          name.startsWith("t-" + directive.name + "-") ||
          name.startsWith("t-" + directive.name + ".")
        ) {
          fullName = name;
          value = attributes[j].textContent;
          validDirectives.push({ directive, value, fullName });
          if (directive.name === "on" || directive.name === "model") {
            withHandlers = true;
          }
        }
      }
    }
    for (let { directive, value, fullName } of validDirectives) {
      if (directive.finalize) {
        finalizers.push({ directive, value, fullName });
      }
      if (directive.atNodeEncounter) {
        const isDone = directive.atNodeEncounter({
          node,
          qweb: this,
          ctx,
          fullName,
          value
        });
        if (isDone) {
          for (let { directive, value, fullName } of finalizers) {
            directive.finalize!({ node, qweb: this, ctx, fullName, value });
          }
          return;
        }
      }
    }
    if (node.nodeName !== "t") {
      let nodeID = this._compileGenericNode(node, ctx, withHandlers);
      ctx = ctx.withParent(nodeID);
      let nodeHooks = {};
      let addNodeHook = function(hook, handler) {
        nodeHooks[hook] = nodeHooks[hook] || [];
        nodeHooks[hook].push(handler);
      };
      for (let { directive, value, fullName } of validDirectives) {
        if (directive.atNodeCreation) {
          directive.atNodeCreation({
            node,
            qweb: this,
            ctx,
            fullName,
            value,
            nodeID,
            addNodeHook
          });
        }
      }
      if (Object.keys(nodeHooks).length) {
        ctx.addLine(`p${nodeID}.hook = {`);
        for (let hook in nodeHooks) {
          ctx.addLine(`  ${hook}: ${NODE_HOOKS_PARAMS[hook]} => {`);
          for (let handler of nodeHooks[hook]) {
            ctx.addLine(`    ${handler}`);
          }
          ctx.addLine(`  },`);
        }
        ctx.addLine(`};`);
      }
    }
    if (node.nodeName === "pre") {
      ctx = ctx.subContext("inPreTag", true);
    }
    this._compileChildren(node, ctx);
    // svg support
    // we hadd svg namespace if it is a svg or if it is a g, but only if it is
    // the root node.  This is the easiest way to support svg sub components:
    // they need to have a g tag as root. Otherwise, we would need a complete
    // list of allowed svg tags.
    const shouldAddNS =
      node.nodeName === "svg" || (node.nodeName === "g" && ctx.rootNode === ctx.parentNode);
    if (shouldAddNS) {
      ctx.rootContext.shouldDefineUtils = true;
      ctx.addLine(`utils.addNameSpace(vn${ctx.parentNode});`);
    }
    for (let { directive, value, fullName } of finalizers) {
      directive.finalize!({ node, qweb: this, ctx, fullName, value });
    }
  }
  _compileGenericNode(
    node: ChildNode,
    ctx: CompilationContext,
    withHandlers: boolean = true
  ): number {
    // nodeType 1 is generic tag
    if (node.nodeType !== 1) {
      throw new Error("unsupported node type");
    }
    const attributes = (<Element>node).attributes;
    const attrs: string[] = [];
    const props: string[] = [];
    const tattrs: number[] = [];
    function handleBooleanProps(key, val) {
      let isProp = false;
      if (node.nodeName === "input" && key === "checked") {
        let type = (<Element>node).getAttribute("type");
        if (type === "checkbox" || type === "radio") {
          isProp = true;
        }
      }
      if (node.nodeName === "option" && key === "selected") {
        isProp = true;
      }
      if (key === "disabled" && DISABLED_TAGS.indexOf(node.nodeName) > -1) {
        isProp = true;
      }
      if ((key === "readonly" && node.nodeName === "input") || node.nodeName === "textarea") {
        isProp = true;
      }
      if (isProp) {
        props.push(`${key}: _${val}`);
      }
    }
    let classObj = "";
    for (let i = 0; i < attributes.length; i++) {
      let name = attributes[i].name;
      let value = attributes[i].textContent!;
      if (this.translateFn && TRANSLATABLE_ATTRS.includes(name)) {
        value = this.translateFn(value);
      }
      // regular attributes
      if (!name.startsWith("t-") && !(<Element>node).getAttribute("t-attf-" + name)) {
        const attID = ctx.generateID();
        if (name === "class") {
          let classDef = value
            .trim()
            .split(/\s+/)
            .map(a => `'${a}':true`)
            .join(",");
          classObj = `_${ctx.generateID()}`;
          ctx.addLine(`let ${classObj} = {${classDef}};`);
        } else {
          ctx.addLine(`var _${attID} = '${value}';`);
          if (!name.match(/^[a-zA-Z]+$/)) {
            // attribute contains 'non letters' => we want to quote it
            name = '"' + name + '"';
          }
          attrs.push(`${name}: _${attID}`);
          handleBooleanProps(name, attID);
        }
      }
      // dynamic attributes
      if (name.startsWith("t-att-")) {
        let attName = name.slice(6);
        const v = ctx.getValue(value);
        let formattedValue = typeof v === "string" ? ctx.formatExpression(v) : v.id;
        if (attName === "class") {
          ctx.rootContext.shouldDefineUtils = true;
          formattedValue = `utils.toObj(${formattedValue})`;
          if (classObj) {
            ctx.addLine(`Object.assign(${classObj}, ${formattedValue})`);
          } else {
            classObj = `_${ctx.generateID()}`;
            ctx.addLine(`let ${classObj} = ${formattedValue};`);
          }
        } else {
          const attID = ctx.generateID();
          if (!attName.match(/^[a-zA-Z]+$/)) {
            // attribute contains 'non letters' => we want to quote it
            attName = '"' + attName + '"';
          }
          // we need to combine dynamic with non dynamic attributes:
          // class="a" t-att-class="'yop'" should be rendered as class="a yop"
          const attValue = (<Element>node).getAttribute(attName);
          if (attValue) {
            const attValueID = ctx.generateID();
            ctx.addLine(`var _${attValueID} = ${formattedValue};`);
            formattedValue = `'${attValue}' + (_${attValueID} ? ' ' + _${attValueID} : '')`;
            const attrIndex = attrs.findIndex(att => att.startsWith(attName + ":"));
            attrs.splice(attrIndex, 1);
          }
          ctx.addLine(`var _${attID} = ${formattedValue};`);
          attrs.push(`${attName}: _${attID}`);
          handleBooleanProps(attName, attID);
        }
      }
      if (name.startsWith("t-attf-")) {
        let attName = name.slice(7);
        if (!attName.match(/^[a-zA-Z]+$/)) {
          // attribute contains 'non letters' => we want to quote it
          attName = '"' + attName + '"';
        }
        const formattedExpr = ctx.interpolate(value);
        const attID = ctx.generateID();
        let staticVal = (<Element>node).getAttribute(attName);
        if (staticVal) {
          ctx.addLine(`var _${attID} = '${staticVal} ' + ${formattedExpr};`);
        } else {
          ctx.addLine(`var _${attID} = ${formattedExpr};`);
        }
        attrs.push(`${attName}: _${attID}`);
      }
      // t-att= attributes
      if (name === "t-att") {
        let id = ctx.generateID();
        ctx.addLine(`var _${id} = ${ctx.formatExpression(value!)};`);
        tattrs.push(id);
      }
    }
    let nodeID = ctx.generateID();
    let nodeKey = ctx.currentKey || nodeID;
    const parts = [`key:${nodeKey}`];
    if (attrs.length + tattrs.length > 0) {
      parts.push(`attrs:{${attrs.join(",")}}`);
    }
    if (props.length > 0) {
      parts.push(`props:{${props.join(",")}}`);
    }
    if (classObj) {
      parts.push(`class:${classObj}`);
    }
    if (withHandlers) {
      parts.push(`on:{}`);
    }
    ctx.addLine(`let c${nodeID} = [], p${nodeID} = {${parts.join(",")}};`);
    for (let id of tattrs) {
      ctx.addIf(`_${id} instanceof Array`);
      ctx.addLine(`p${nodeID}.attrs[_${id}[0]] = _${id}[1];`);
      ctx.addElse();
      ctx.addLine(`for (let key in _${id}) {`);
      ctx.indent();
      ctx.addLine(`p${nodeID}.attrs[key] = _${id}[key];`);
      ctx.dedent();
      ctx.addLine(`}`);
      ctx.closeIf();
    }
    ctx.addLine(`var vn${nodeID} = h('${node.nodeName}', p${nodeID}, c${nodeID});`);
    if (ctx.parentNode) {
      ctx.addLine(`c${ctx.parentNode}.push(vn${nodeID});`);
    }
    return nodeID;
  }
  _compileChildren(node: ChildNode, ctx: CompilationContext) {
    if (node.childNodes.length > 0) {
      for (let child of Array.from(node.childNodes)) {
        this._compileNode(child, ctx);
      }
    }
  }
 }
@@ -1,241 +0,0 @@
 import { onWillUnmount } from "./component/lifecycle_hooks";
 import { ComponentNode, getCurrent } from "./component/component_node";
 // Allows to get the target of a Reactive (used for making a new Reactive from the underlying object)
 const TARGET = Symbol("Target");
 // Special key to subscribe to, to be notified of key creation/deletion
 const KEYCHANGES = Symbol("Key changes");
 type ObjectKey = string | number | symbol;
 type Target = object;
 type Callback = () => void;
 type Reactive<T extends Target = Target> = T & {
  [TARGET]: any;
 };
 /**
 * Checks whether a given value can be made into a reactive object.
 *
 * @param value the value to check
 * @returns whether the value can be made reactive
 */
 function canBeMadeReactive(value: any): boolean {
  return (
    typeof value === "object" &&
    value !== null &&
    !(value instanceof Date) &&
    !(value instanceof Promise) &&
    !(value instanceof String) &&
    !(value instanceof Number)
  );
 }
 const targetToKeysToCallbacks = new WeakMap<Target, Map<ObjectKey, Set<Callback>>>();
 /**
 * Observes a given key on a target with an callback. The callback will be
 * called when the given key changes on the target.
 *
 * @param target the target whose key should be observed
 * @param key the key to observe (or Symbol(KEYCHANGES) for key creation
 *  or deletion)
 * @param callback the function to call when the key changes
 */
 function observeTargetKey(target: Target, key: ObjectKey, callback: Callback): void {
  if (!targetToKeysToCallbacks.get(target)) {
    targetToKeysToCallbacks.set(target, new Map());
  }
  const keyToCallbacks = targetToKeysToCallbacks.get(target)!;
  if (!keyToCallbacks.get(key)) {
    keyToCallbacks.set(key, new Set());
  }
  keyToCallbacks.get(key)!.add(callback);
  if (!callbacksToTargets.has(callback)) {
    callbacksToTargets.set(callback, new Set());
  }
  callbacksToTargets.get(callback)!.add(target);
 }
 /**
 * Notify Reactives that are observing a given target that a key has changed on
 * the target.
 *
 * @param target target whose Reactives should be notified that the target was
 *  changed.
 * @param key the key that changed (or Symbol `KEYCHANGES` if a key was created
 *   or deleted)
 */
 function notifyReactives(target: Target, key: ObjectKey): void {
  const keyToCallbacks = targetToKeysToCallbacks.get(target);
  if (!keyToCallbacks) {
    return;
  }
  const callbacks = keyToCallbacks.get(key);
  if (!callbacks) {
    return;
  }
  // Loop on copy because clearReactivesForCallback will modify the set in place
  for (const callback of [...callbacks]) {
    clearReactivesForCallback(callback);
    callback();
  }
 }
 const callbacksToTargets = new WeakMap<Callback, Set<Target>>();
 /**
 * Clears all subscriptions of the Reactives associated with a given callback.
 *
 * @param callback the callback for which the reactives need to be cleared
 */
 function clearReactivesForCallback(callback: Callback): void {
  const targetsToClear = callbacksToTargets.get(callback);
  if (!targetsToClear) {
    return;
  }
  for (const target of targetsToClear) {
    const observedKeys = targetToKeysToCallbacks.get(target);
    if (!observedKeys) {
      continue;
    }
    for (const callbacks of observedKeys.values()) {
      callbacks.delete(callback);
    }
  }
  targetsToClear.clear();
 }
 const reactiveCache = new WeakMap<Target, WeakMap<Callback, Reactive>>();
 /**
 * Creates a reactive proxy for an object. Reading data on the reactive object
 * subscribes to changes to the data. Writing data on the object will cause the
 * notify callback to be called if there are suscriptions to that data. Nested
 * objects and arrays are automatically made reactive as well.
 *
 * Whenever you are notified of a change, all subscriptions are cleared, and if
 * you would like to be notified of any further changes, you should go read
 * the underlying data again. We assume that if you don't go read it again after
 * being notified, it means that you are no longer interested in that data.
 *
 * Subscriptions:
 * + Reading a property on an object will subscribe you to changes in the value
 *    of that property.
 * + Accessing an object keys (eg with Object.keys or with `for..in`) will
 *    subscribe you to the creation/deletion of keys. Checking the presence of a
 *    key on the object with 'in' has the same effect.
 * - getOwnPropertyDescriptor does not currently subscribe you to the property.
 *    This is a choice that was made because changing a key's value will trigger
 *    this trap and we do not want to subscribe by writes. This also means that
 *    Object.hasOwnProperty doesn't subscribe as it goes through this trap.
 *
 * @param target the object for which to create a reactive proxy
 * @param callback the function to call when an observed property of the
 *  reactive has changed
 * @returns a proxy that tracks changes to it
 */
 export function reactive<T extends Target>(target: T, callback: Callback = () => {}): Reactive<T> {
  if (!canBeMadeReactive(target)) {
    throw new Error(`Cannot make the given value reactive`);
  }
  const originalTarget = (target as Reactive)[TARGET];
  if (originalTarget) {
    return reactive(originalTarget, callback);
  }
  if (!reactiveCache.has(target)) {
    reactiveCache.set(target, new Map());
  }
  const reactivesForTarget = reactiveCache.get(target)!;
  if (!reactivesForTarget.has(callback)) {
    const proxy = new Proxy(target, {
      get(target: any, key: ObjectKey, proxy: Reactive<T>) {
        if (key === TARGET) {
          return target;
        }
        observeTargetKey(target, key, callback);
        const value = Reflect.get(target, key, proxy);
        if (!canBeMadeReactive(value)) {
          return value;
        }
        return reactive(value, callback);
      },
      set(target, key, value, proxy) {
        const isNewKey = !Object.hasOwnProperty.call(target, key);
        const originalValue = Reflect.get(target, key, proxy);
        const ret = Reflect.set(target, key, value, proxy);
        if (isNewKey) {
          notifyReactives(target, KEYCHANGES);
        }
        // While Array length may trigger the set trap, it's not actually set by this
        // method but is updated behind the scenes, and the trap is not called with the
        // new value. We disable the "same-value-optimization" for it because of that.
        if (originalValue !== value || (Array.isArray(target) && key === "length")) {
          notifyReactives(target, key);
        }
        return ret;
      },
      deleteProperty(target, key) {
        const ret = Reflect.deleteProperty(target, key);
        notifyReactives(target, KEYCHANGES);
        notifyReactives(target, key);
        return ret;
      },
      ownKeys(target) {
        observeTargetKey(target, KEYCHANGES, callback);
        return Reflect.ownKeys(target);
      },
      has(target, key) {
        // TODO: this observes all key changes instead of only the presence of the argument key
        observeTargetKey(target, KEYCHANGES, callback);
        return Reflect.has(target, key);
      },
    });
    reactivesForTarget.set(callback, proxy);
  }
  return reactivesForTarget.get(callback) as Reactive<T>;
 }
 /**
 * Creates a batched version of a callback so that all calls to it in the same
 * microtick will only call the original callback once.
 *
 * @param callback the callback to batch
 * @returns a batched version of the original callback
 */
 export function batched(callback: Callback): Callback {
  let called = false;
  return async () => {
    // This await blocks all calls to the callback here, then releases them sequentially
    // in the next microtick. This line decides the granularity of the batch.
    await Promise.resolve();
    if (!called) {
      called = true;
      callback();
      // wait for all calls in this microtick to fall through before resetting "called"
      // so that only the first call to the batched function calls the original callback
      await Promise.resolve();
      called = false;
    }
  };
 }
 const batchedRenderFunctions = new WeakMap<ComponentNode, Callback>();
 /**
 * Creates a reactive object that will be observed by the current component.
 * Reading data from the returned object (eg during rendering) will cause the
 * component to subscribe to that data and be rerendered when it changes.
 *
 * @param state the state to observe
 * @returns a reactive object that will cause the component to re-render on
 *  relevant changes
 * @see reactive
 */
 export function useState<T extends object>(state: T): Reactive<T> {
  const node = getCurrent()!;
  if (!batchedRenderFunctions.has(node)) {
    batchedRenderFunctions.set(
      node,
      batched(() => node.render())
    );
    onWillUnmount(() => clearReactivesForCallback(render));
  }
  const render = batchedRenderFunctions.get(node)!;
  const reactiveState = reactive(state, render);
  return reactiveState;
 }
@@ -0,0 +1,48 @@
 import { Component } from "../component/component";
 import { xml } from "../tags";
 import { Destination, RouterEnv } from "./router";
 type Props = Destination;
 export class Link<Env extends RouterEnv> extends Component<Env, Props> {
  static template = xml`
    <a  t-att-class="{'router-link-active': isActive }"
        t-att-href="href"
        t-on-click="navigate">
        <t t-slot="default"/>
    </a>
  `;
  href: string = this.env.router.destToPath(this.props);
  async willUpdateProps(nextProps) {
    this.href = this.env.router.destToPath(nextProps);
  }
  get isActive() {
    if (this.env.router.mode === "hash") {
      return (<any>document.location).hash === this.href;
    }
    return (<any>document.location).pathname === this.href;
  }
  navigate(ev) {
    // don't redirect with control keys
    if (ev.metaKey || ev.altKey || ev.ctrlKey || ev.shiftKey) {
      return;
    }
    // don't redirect on right click
    if (ev.button !== undefined && ev.button !== 0) {
      return;
    }
    // don't redirect if `target="_blank"`
    if (ev.currentTarget && ev.currentTarget.getAttribute) {
      const target = ev.currentTarget.getAttribute("target");
      if (/\b_blank\b/i.test(target)) {
        return;
      }
    }
    ev.preventDefault();
    this.env.router.navigate(this.props);
  }
 }
@@ -0,0 +1,18 @@
 import { Component } from "../component/component";
 import { xml } from "../tags";
 export class RouteComponent extends Component<any, {}> {
  static template = xml`
    <t>
        <t
            t-if="routeComponent"
            t-component="routeComponent"
            t-key="env.router.currentRouteName"
            t-props="env.router.currentParams" />
    </t>
  `;
  get routeComponent(): any {
    return this.env.router.currentRoute && this.env.router.currentRoute.component;
  }
 }
@@ -0,0 +1,275 @@
 import { Env } from "../component/component";
 import { QWeb } from "../qweb/index";
 import { shallowEqual } from "../utils";
 type NavigationGuard = (info: {
  env: Env;
  to: Route | null;
  from: Route | null;
 }) => boolean | Destination;
 export interface Route {
  name: string;
  path: string;
  component?: any;
  redirect?: Destination;
  params: string[];
  beforeRouteEnter?: NavigationGuard;
 }
 export type RouteParams = { [key: string]: string | number };
 export interface RouterEnv extends Env {
  router: Router;
 }
 export interface Destination {
  path?: string;
  to?: string;
  params?: RouteParams;
 }
 interface PositiveMatchResult {
  type: "match";
  route: Route;
  params: RouteParams;
 }
 interface NegativeMatchResult {
  type: "nomatch";
 }
 interface CancelledMatch {
  type: "cancelled";
 }
 type MatchResult = PositiveMatchResult | NegativeMatchResult | CancelledMatch;
 interface Options {
  mode: Router["mode"];
 }
 const paramRegexp = /\{\{(.*?)\}\}/;
 export class Router {
  currentRoute: Route | null = null;
  currentParams: RouteParams | null = null;
  mode: "history" | "hash";
  routes: { [id: string]: Route };
  routeIds: string[];
  env: RouterEnv;
  constructor(env: Env, routes: Partial<Route>[], options: Options = { mode: "history" }) {
    env.router = this;
    this.mode = options.mode;
    this.env = env as RouterEnv;
    this.routes = {};
    this.routeIds = [];
    let nextId = 1;
    for (let partialRoute of routes) {
      if (!partialRoute.name) {
        partialRoute.name = "__route__" + nextId++;
      }
      if (partialRoute.component) {
        QWeb.registerComponent("__component__" + partialRoute.name, partialRoute.component);
      }
      if (partialRoute.redirect) {
        this.validateDestination(partialRoute.redirect);
      }
      partialRoute.params = partialRoute.path ? findParams(partialRoute.path) : [];
      this.routes[partialRoute.name] = partialRoute as Route;
      this.routeIds.push(partialRoute.name);
    }
  }
  //--------------------------------------------------------------------------
  // Public API
  //--------------------------------------------------------------------------
  async start() {
    (this as any)._listener = ev => this._navigate(this.currentPath(), ev);
    window.addEventListener("popstate", (this as any)._listener);
    if (this.mode === "hash") {
      window.addEventListener("hashchange", (this as any)._listener);
    }
    const result = await this.matchAndApplyRules(this.currentPath());
    if (result.type === "match") {
      this.currentRoute = result.route;
      this.currentParams = result.params;
      const currentPath = this.routeToPath(result.route, result.params);
      if (currentPath !== this.currentPath()) {
        this.setUrlFromPath(currentPath);
      }
    }
  }
  async navigate(to: Destination): Promise<boolean> {
    const path = this.destToPath(to);
    return this._navigate(path);
  }
  async _navigate(path: string, ev?: any): Promise<boolean> {
    const initialName = this.currentRouteName;
    const initialParams = this.currentParams;
    const result = await this.matchAndApplyRules(path);
    if (result.type === "match") {
      const finalPath = this.routeToPath(result.route, result.params);
      const isPopStateEvent = ev && ev instanceof PopStateEvent;
      if (!isPopStateEvent) {
        this.setUrlFromPath(finalPath);
      }
      this.currentRoute = result.route;
      this.currentParams = result.params;
    } else if (result.type === "nomatch") {
      this.currentRoute = null;
      this.currentParams = null;
    }
    const didChange =
      this.currentRouteName !== initialName || !shallowEqual(this.currentParams, initialParams);
    if (didChange) {
      this.env.qweb.forceUpdate();
      return true;
    }
    return false;
  }
  destToPath(dest: Destination): string {
    this.validateDestination(dest);
    return dest.path || this.routeToPath(this.routes[dest.to!], dest.params!);
  }
  get currentRouteName(): string | null {
    return this.currentRoute && this.currentRoute.name;
  }
  //--------------------------------------------------------------------------
  // Private helpers
  //--------------------------------------------------------------------------
  private setUrlFromPath(path: string) {
    const separator = this.mode === "hash" ? location.pathname : "";
    const url = location.origin + separator + path;
    if (url !== window.location.href) {
      window.history.pushState({}, path, url);
    }
  }
  private validateDestination(dest: Destination) {
    if ((!dest.path && !dest.to) || (dest.path && dest.to)) {
      throw new Error(`Invalid destination: ${JSON.stringify(dest)}`);
    }
  }
  private routeToPath(route: Route, params: RouteParams): string {
    const path = route.path;
    const parts = path.split("/");
    const l = parts.length;
    for (let i = 0; i < l; i++) {
      const part = parts[i];
      const match = part.match(paramRegexp);
      if (match) {
        const key = match[1].split(".")[0];
        parts[i] = <string>params[key];
      }
    }
    const prefix = this.mode === "hash" ? "#" : "";
    return prefix + parts.join("/");
  }
  private currentPath(): string {
    let result = this.mode === "history" ? window.location.pathname : window.location.hash.slice(1);
    return result || "/";
  }
  private match(path: string): MatchResult {
    for (let routeId of this.routeIds) {
      let route = this.routes[routeId];
      let params = this.getRouteParams(route, path);
      if (params) {
        return {
          type: "match",
          route: route,
          params: params
        };
      }
    }
    return { type: "nomatch" };
  }
  private async matchAndApplyRules(path: string): Promise<MatchResult> {
    const result = this.match(path);
    if (result.type === "match") {
      return this.applyRules(result);
    }
    return result;
  }
  private async applyRules(matchResult: PositiveMatchResult): Promise<MatchResult> {
    const route = matchResult.route;
    if (route.redirect) {
      const path = this.destToPath(route.redirect);
      return this.matchAndApplyRules(path);
    }
    if (route.beforeRouteEnter) {
      const result = await route.beforeRouteEnter({
        env: this.env,
        from: this.currentRoute,
        to: route
      });
      if (result === false) {
        return { type: "cancelled" };
      } else if (result !== true) {
        // we want to navigate to another destination
        const path = this.destToPath(result);
        return this.matchAndApplyRules(path);
      }
    }
    return matchResult;
  }
  private getRouteParams(route: Route, path: string): RouteParams | false {
    if (route.path === "*") {
      return {};
    }
    if (path.startsWith("#")) {
      path = path.slice(1);
    }
    const descrParts = route.path.split("/");
    const targetParts = path.split("/");
    const l = descrParts.length;
    if (l !== targetParts.length) {
      return false;
    }
    const result = {};
    for (let i = 0; i < l; i++) {
      const descr = descrParts[i];
      let target: string | number = targetParts[i];
      const match = descr.match(paramRegexp);
      if (match) {
        const [key, suffix] = match[1].split(".");
        if (suffix === "number") {
          target = parseInt(target, 10);
        }
        result[key] = target;
      } else if (descr !== target) {
        return false;
      }
    }
    return result;
  }
 }
 function findParams(str: string): string[] {
  const globalParamRegexp = /\{\{(.*?)\}\}/g;
  const result: string[] = [];
  let m;
  do {
    m = globalParamRegexp.exec(str);
    if (m) {
      result.push(m[1].split(".")[0]);
    }
  } while (m);
  return result;
 }
@@ -0,0 +1,156 @@
 import { Component } from "./component/component";
 import { Env } from "./component/component";
 import { Context, useContextWithCB } from "./context";
 import { onWillUpdateProps } from "./hooks";
 /**
 * Owl Store
 *
 * We have here:
 * - a Store class
 * - useStore hook
 * - useDispatch hook
 * - useGetters hook
 *
 * The Owl store is our answer to the problem of managing complex state across
 * components. The main idea is that the store owns some state, allow external
 * code to modify it through actions, and for each state changes,
 * connected component will be notified, and updated if necessary.
 *
 * Note that this code is partly inspired by VueX and React/Redux
 */
 //------------------------------------------------------------------------------
 // Store Definition
 //------------------------------------------------------------------------------
 export type Action = ({ state, dispatch, env, getters }, ...payload: any) => any;
 export type Getter = ({ state: any, getters }, payload?) => any;
 interface StoreConfig {
  env?: Env;
  state?: any;
  actions?: { [name: string]: Action };
  getters?: { [name: string]: Getter };
 }
 export class Store extends Context {
  actions: any;
  env: any;
  getters: { [name: string]: (payload?) => any };
  updateFunctions: { [key: number]: (() => boolean)[] };
  constructor(config: StoreConfig) {
    super(config.state);
    this.actions = config.actions;
    this.env = config.env;
    this.getters = {};
    this.updateFunctions = [];
    if (config.getters) {
      const firstArg = {
        state: this.state,
        getters: this.getters
      };
      for (let g in config.getters) {
        this.getters[g] = config.getters[g].bind(this, firstArg);
      }
    }
  }
  dispatch(action: string, ...payload: any): Promise<void> | void {
    if (!this.actions[action]) {
      throw new Error(`[Error] action ${action} is undefined`);
    }
    const result = this.actions[action](
      {
        dispatch: this.dispatch.bind(this),
        env: this.env,
        state: this.state,
        getters: this.getters
      },
      ...payload
    );
    return result;
  }
 }
 interface SelectorOptions {
  store?: Store;
  isEqual?: (a: any, b: any) => boolean;
  onUpdate?: (result: any) => any;
 }
 const isStrictEqual = (a, b) => a === b;
 export function useStore(selector, options: SelectorOptions = {}): any {
  const component: Component<any, any> = Component.current!;
  const componentId = component.__owl__.id;
  const store = options.store || (component.env.store as Store);
  if (!(store instanceof Store)) {
    throw new Error(`No store found when connecting '${component.constructor.name}'`);
  }
  let result = selector(store.state, component.props);
  const hashFn = store.observer.revNumber.bind(store.observer);
  let revNumber = hashFn(result);
  const isEqual = options.isEqual || isStrictEqual;
  if (!store.updateFunctions[componentId]) {
    store.updateFunctions[componentId] = [];
  }
  function selectCompareUpdate(state, props): boolean {
    const oldResult = result;
    result = selector(state, props);
    const newRevNumber = hashFn(result);
    if ((newRevNumber > 0 && revNumber !== newRevNumber) || !isEqual(oldResult, result)) {
      revNumber = newRevNumber;
      if (options.onUpdate) {
        options.onUpdate(result);
      }
      return true;
    }
    return false;
  }
  store.updateFunctions[componentId].push(function(): boolean {
    return selectCompareUpdate(store!.state, component.props);
  });
  useContextWithCB(store, component, function(): Promise<void> | void {
    let shouldRender = false;
    for (let fn of store.updateFunctions[componentId]) {
      shouldRender = fn() || shouldRender;
    }
    if (shouldRender) {
      return component.render();
    }
  });
  onWillUpdateProps(props => {
    selectCompareUpdate(store.state, props);
  });
  const __destroy = component.__destroy;
  component.__destroy = parent => {
    delete store.updateFunctions[componentId];
    __destroy.call(component, parent);
  };
  if (typeof result !== "object") {
    return result;
  }
  return new Proxy(result, {
    get(target, k) {
      return result[k];
    },
    set(target, k, v) {
      throw new Error("Store state should only be modified through actions");
    }
  });
 }
 export function useDispatch(store?: Store): Store["dispatch"] {
  store = store || (Component.current!.env.store as Store);
  return store.dispatch.bind(store);
 }
 export function useGetters(store?: Store): Store["getters"] {
  store = store || (Component.current!.env.store as Store);
  return store.getters;
 }
@@ -0,0 +1,27 @@
 import { QWeb } from "./qweb/index";
 /**
 * Owl Tags
 *
 * We have here a (very) small collection of tag functions:
 *
 * - xml
 *
 * The plan is to add a few other tags such as css, globalcss.
 */
 /**
 * XML tag helper for defining templates.  With this, one can simply define
 * an inline template with just the template xml:
 * ```js
 *   class A extends Component {
 *     static template = xml`<div>some template</div>`;
 *   }
 * ```
 */
 export function xml(strings, ...args) {
  const name = `__template__${QWeb.nextId++}`;
  const value = String.raw(strings, ...args);
  QWeb.registerTemplate(name, value);
  return name;
 }
@@ -1,17 +1,46 @@
-export class EventBus extends EventTarget {
+/**
-  trigger(name: string, payload?: any) {
+ * Owl Utils
-    this.dispatchEvent(new CustomEvent(name, { detail: payload }));
+ *
-  }
+ * We have here a small collection of utility functions:
-}
+ *
 * - whenReady
 * - loadJS
 * - loadFile
 * - escape
 * - debounce
 */
-export function whenReady(fn?: any): Promise<void> {
+export function whenReady(fn?: any) {
-  return new Promise(function (resolve) {
+  return new Promise(function(resolve) {
    if (document.readyState !== "loading") {
-      resolve(true);
+      resolve();
    } else {
      document.addEventListener("DOMContentLoaded", resolve, false);
    }
-  }).then(fn || function () {});
+  }).then(fn || function() {});
 }
 const loadedScripts: { [key: string]: Promise<void> } = {};
 export function loadJS(url: string): Promise<void> {
  if (url in loadedScripts) {
    return loadedScripts[url];
  }
  const promise: Promise<void> = new Promise(function(resolve, reject) {
    const script = document.createElement("script");
    script.type = "text/javascript";
    script.src = url;
    script.onload = function() {
      resolve();
    };
    script.onerror = function() {
      reject(`Error loading file '${url}'`);
    };
    const head = document.head || document.getElementsByTagName("head")[0];
    head.appendChild(script);
  });
  loadedScripts[url] = promise;
  return promise;
 }
 export async function loadFile(url: string): Promise<string> {
@@ -22,17 +51,54 @@ export async function loadFile(url: string): Promise<string> {
  return await result.text();
 }
-/*
+export function escape(str: string | number | undefined): string {
- * This class just transports the fact that a string is safe
+  if (str === undefined) {
- * to be injected as HTML. Overriding a JS primitive is quite painful though
+    return "";
- * so we need to redfine toString and valueOf.
+  }
- */
+  if (typeof str === "number") {
-export class Markup extends String {}
+    return String(str);
-
+  }
-/*
+  return str
- * Marks a value as safe, that is, a value that can be injected as HTML directly.
+    .replace(/&/g, "&amp;")
- * It should be used to wrap the value passed to a t-out directive to allow a raw rendering.
+    .replace(/</g, "&lt;")
- */
+    .replace(/>/g, "&gt;")
-export function markup(value: any) {
+    .replace(/"/g, "&#x27;")
-  return new Markup(value);
+    .replace(/`/g, "&#x60;");
 }
 /**
 * Returns a function, that, as long as it continues to be invoked, will not
 * be triggered. The function will be called after it stops being called for
 * N milliseconds. If `immediate` is passed, trigger the function on the
 * leading edge, instead of the trailing.
 *
 * Inspired by https://davidwalsh.name/javascript-debounce-function
 */
 export function debounce(func: Function, wait: number, immediate?: boolean): Function {
  let timeout;
  return function(this: any) {
    const context = this;
    const args = arguments;
    function later() {
      timeout = null;
      if (!immediate) {
        func.apply(context, args);
      }
    }
    const callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, wait);
    if (callNow) {
      func.apply(context, args);
    }
  };
 }
 export function shallowEqual(p1, p2): boolean {
  for (let k in p1) {
    if (p1[k] !== p2[k]) {
      return false;
    }
  }
  return true;
 }
@@ -0,0 +1,27 @@
 import { VNode, h } from "./vdom";
 const parser = new DOMParser();
 export function htmlToVDOM(html: string): VNode[] {
  const doc = parser.parseFromString(html, "text/html");
  const result: VNode[] = [];
  for (let child of doc.body.childNodes) {
    result.push(htmlToVNode(child));
  }
  return result;
 }
 function htmlToVNode(node: ChildNode): VNode {
  if (!(node instanceof Element)) {
    return { text: node.textContent! } as VNode;
  }
  const attrs = {};
  for (let attr of node.attributes) {
    attrs[attr.name] = attr.textContent;
  }
  const children: VNode[] = [];
  for (let c of node.childNodes) {
    children.push(htmlToVNode(c));
  }
  return h((node as Element).tagName, { attrs }, children);
 }
@@ -0,0 +1,9 @@
 import { attrsModule, classModule, eventListenersModule, propsModule } from "./modules";
 import { init } from "./vdom";
 //------------------------------------------------------------------------------
 // patch
 //------------------------------------------------------------------------------
 export { h, VNode } from "./vdom";
 export const patch = init([eventListenersModule, attrsModule, propsModule, classModule]);
@@ -0,0 +1,234 @@
 import { Module, VNode, VNodeData } from "./vdom";
 //------------------------------------------------------------------------------
 // module/props.ts
 //------------------------------------------------------------------------------
 function updateProps(oldVnode: VNode, vnode: VNode): void {
  var key: string,
    cur: any,
    old: any,
    elm = vnode.elm,
    oldProps = (oldVnode.data as VNodeData).props,
    props = (vnode.data as VNodeData).props;
  if (!oldProps && !props) return;
  if (oldProps === props) return;
  oldProps = oldProps || {};
  props = props || {};
  for (key in oldProps) {
    if (!props[key]) {
      delete (elm as any)[key];
    }
  }
  for (key in props) {
    cur = props[key];
    old = oldProps[key];
    if (old !== cur && (key !== "value" || (elm as any)[key] !== cur)) {
      (elm as any)[key] = cur;
    }
  }
 }
 export const propsModule = {
  create: updateProps,
  update: updateProps
 } as Module;
 //------------------------------------------------------------------------------
 // module/eventlisteners.ts
 //------------------------------------------------------------------------------
 function invokeHandler(handler: any, vnode?: VNode, event?: Event): void {
  if (typeof handler === "function") {
    // call function handler
    handler.call(vnode, event, vnode);
  } else if (typeof handler === "object") {
    // call handler with arguments
    if (typeof handler[0] === "function") {
      // special case for single argument for performance
      if (handler.length === 2) {
        handler[0].call(vnode, handler[1], event, vnode);
      } else {
        var args = handler.slice(1);
        args.push(event);
        args.push(vnode);
        handler[0].apply(vnode, args);
      }
    } else {
      // call multiple handlers
      for (let i = 0, iLen = handler.length; i < iLen; i++) {
        invokeHandler(handler[i], vnode, event);
      }
    }
  }
 }
 function handleEvent(event: Event, vnode: VNode) {
  var name = event.type,
    on = (vnode.data as VNodeData).on;
  // call event handler(s) if exists
  if (on && on[name]) {
    invokeHandler(on[name], vnode, event);
  }
 }
 function createListener() {
  return function handler(event: Event) {
    handleEvent(event, (handler as any).vnode);
  };
 }
 function updateEventListeners(oldVnode: VNode, vnode?: VNode): void {
  var oldOn = (oldVnode.data as VNodeData).on,
    oldListener = (oldVnode as any).listener,
    oldElm: Element = oldVnode.elm as Element,
    on = vnode && (vnode.data as VNodeData).on,
    elm: Element = (vnode && vnode.elm) as Element,
    name: string;
  // optimization for reused immutable handlers
  if (oldOn === on) {
    return;
  }
  // remove existing listeners which no longer used
  if (oldOn && oldListener) {
    // if element changed or deleted we remove all existing listeners unconditionally
    if (!on) {
      for (name in oldOn) {
        // remove listener if element was changed or existing listeners removed
        oldElm.removeEventListener(name, oldListener, false);
      }
    } else {
      for (name in oldOn) {
        // remove listener if existing listener removed
        if (!on[name]) {
          oldElm.removeEventListener(name, oldListener, false);
        }
      }
    }
  }
  // add new listeners which has not already attached
  if (on) {
    // reuse existing listener or create new
    var listener = ((vnode as any).listener = (oldVnode as any).listener || createListener());
    // update vnode for listener
    listener.vnode = vnode;
    // if element changed or added we add all needed listeners unconditionally
    if (!oldOn) {
      for (name in on) {
        // add listener if element was changed or new listeners added
        elm.addEventListener(name, listener, false);
      }
    } else {
      for (name in on) {
        // add listener if new listener added
        if (!oldOn[name]) {
          elm.addEventListener(name, listener, false);
        }
      }
    }
  }
 }
 export const eventListenersModule = {
  create: updateEventListeners,
  update: updateEventListeners,
  destroy: updateEventListeners
 } as Module;
 //------------------------------------------------------------------------------
 // attributes.ts
 //------------------------------------------------------------------------------
 const xlinkNS = "http://www.w3.org/1999/xlink";
 const xmlNS = "http://www.w3.org/XML/1998/namespace";
 const colonChar = 58;
 const xChar = 120;
 function updateAttrs(oldVnode: VNode, vnode: VNode): void {
  var key: string,
    elm: Element = vnode.elm as Element,
    oldAttrs = (oldVnode.data as VNodeData).attrs,
    attrs = (vnode.data as VNodeData).attrs;
  if (!oldAttrs && !attrs) return;
  if (oldAttrs === attrs) return;
  oldAttrs = oldAttrs || {};
  attrs = attrs || {};
  // update modified attributes, add new attributes
  for (key in attrs) {
    const cur = attrs[key];
    const old = oldAttrs[key];
    if (old !== cur) {
      if (cur === true) {
        elm.setAttribute(key, "");
      } else if (cur === false) {
        elm.removeAttribute(key);
      } else {
        if (key.charCodeAt(0) !== xChar) {
          elm.setAttribute(key, cur);
        } else if (key.charCodeAt(3) === colonChar) {
          // Assume xml namespace
          elm.setAttributeNS(xmlNS, key, cur);
        } else if (key.charCodeAt(5) === colonChar) {
          // Assume xlink namespace
          elm.setAttributeNS(xlinkNS, key, cur);
        } else {
          elm.setAttribute(key, cur);
        }
      }
    }
  }
  // remove removed attributes
  // use `in` operator since the previous `for` iteration uses it (.i.e. add even attributes with undefined value)
  // the other option is to remove all attributes with value == undefined
  for (key in oldAttrs) {
    if (!(key in attrs)) {
      elm.removeAttribute(key);
    }
  }
 }
 export const attrsModule = {
  create: updateAttrs,
  update: updateAttrs
 } as Module;
 //------------------------------------------------------------------------------
 // class.ts
 //------------------------------------------------------------------------------
 function updateClass(oldVnode: VNode, vnode: VNode): void {
  var cur: any,
    name: string,
    elm: Element,
    oldClass = (oldVnode.data as VNodeData).class,
    klass = (vnode.data as VNodeData).class;
  if (!oldClass && !klass) return;
  if (oldClass === klass) return;
  oldClass = oldClass || {};
  klass = klass || {};
  elm = vnode.elm as Element;
  for (name in oldClass) {
    if (!klass[name]) {
      elm.classList.remove(name);
    }
  }
  for (name in klass) {
    cur = klass[name];
    if (cur !== oldClass[name]) {
      (elm.classList as any)[cur ? "add" : "remove"](name);
    }
  }
 }
 export const classModule = { create: updateClass, update: updateClass } as Module;
@@ -0,0 +1,616 @@
 /**
 * Owl VDOM
 *
 * This file contains an implementation of a virtual DOM, which is a system that
 * can generate in-memory representations of a DOM tree, compare them, and
 * eventually change a concrete DOM tree to match its representation, in an
 * hopefully efficient way.
 *
 * Note that this code is a fork of Snabbdom, slightly tweaked/optimized for our
 * needs (see https://github.com/snabbdom/snabbdom).
 *
 * The main exported values are:
 * - interface VNode
 * - h function (a helper function to generate a vnode)
 * - patch function (to apply a vnode to an actual DOM node)
 */
 // because those in TypeScript are too restrictive: https://github.com/Microsoft/TSJS-lib-generator/pull/237
 declare global {
  interface Element {
    setAttribute(name: string, value: string | number | boolean): void;
    setAttributeNS(
      namespaceURI: string,
      qualifiedName: string,
      value: string | number | boolean
    ): void;
  }
 }
 type Props = Record<string, any>;
 type Attrs = Record<string, string | number | boolean>;
 type On = { [N in keyof HTMLElementEventMap]?: (ev: HTMLElementEventMap[N]) => void } & {
  [event: string]: EventListener;
 };
 export interface Module {
  pre: PreHook;
  create: CreateHook;
  update: UpdateHook;
  destroy: DestroyHook;
  remove: RemoveHook;
  post: PostHook;
 }
 //------------------------------------------------------------------------------
 // vnode.ts
 //------------------------------------------------------------------------------
 type Key = string | number;
 export interface VNode {
  sel: string | undefined;
  data: VNodeData | undefined;
  children: Array<VNode | string> | undefined;
  elm: Node | undefined;
  text: string | undefined;
  key: Key | undefined;
 }
 export interface VNodeData {
  props?: Props;
  attrs?: Attrs;
  on?: On;
  hook?: Hooks;
  key?: Key;
  ns?: string; // for SVGs
  [key: string]: any; // for any other 3rd party module
 }
 function vnode(
  sel: string | undefined,
  data: any | undefined,
  children: Array<VNode | string> | undefined,
  text: string | undefined,
  elm: Element | Text | undefined
 ): VNode {
  let key = data === undefined ? undefined : data.key;
  return { sel, data, children, text, elm, key };
 }
 //------------------------------------------------------------------------------
 // snabbdom.ts
 //------------------------------------------------------------------------------
 function isUndef(s: any): boolean {
  return s === undefined;
 }
 function isDef(s: any): boolean {
  return s !== undefined;
 }
 type VNodeQueue = Array<VNode>;
 const emptyNode = vnode("", {}, [], undefined, undefined);
 function sameVnode(vnode1: VNode, vnode2: VNode): boolean {
  return vnode1.key === vnode2.key && vnode1.sel === vnode2.sel;
 }
 function isVnode(vnode: any): vnode is VNode {
  return vnode.sel !== undefined;
 }
 type KeyToIndexMap = { [key: string]: number };
 type ArraysOf<T> = { [K in keyof T]: T[K][] };
 type ModuleHooks = ArraysOf<Module>;
 function createKeyToOldIdx(
  children: Array<VNode>,
  beginIdx: number,
  endIdx: number
 ): KeyToIndexMap {
  let i: number,
    map: KeyToIndexMap = {},
    key: Key | undefined,
    ch;
  for (i = beginIdx; i <= endIdx; ++i) {
    ch = children[i];
    if (ch != null) {
      key = ch.key;
      if (key !== undefined) map[key] = i;
    }
  }
  return map;
 }
 const hooks: (keyof Module)[] = ["create", "update", "remove", "destroy", "pre", "post"];
 export function init(modules: Array<Partial<Module>>, domApi?: DOMAPI) {
  let i: number,
    j: number,
    cbs = {} as ModuleHooks;
  const api: DOMAPI = domApi !== undefined ? domApi : htmlDomApi;
  for (i = 0; i < hooks.length; ++i) {
    cbs[hooks[i]] = [];
    for (j = 0; j < modules.length; ++j) {
      const hook = modules[j][hooks[i]];
      if (hook !== undefined) {
        (cbs[hooks[i]] as Array<any>).push(hook);
      }
    }
  }
  function emptyNodeAt(elm: Element) {
    const id = elm.id ? "#" + elm.id : "";
    const c = elm.className ? "." + elm.className.split(" ").join(".") : "";
    return vnode(api.tagName(elm).toLowerCase() + id + c, {}, [], undefined, elm);
  }
  function createRmCb(childElm: Node, listeners: number) {
    return function rmCb() {
      if (--listeners === 0) {
        const parent = api.parentNode(childElm);
        api.removeChild(parent, childElm);
      }
    };
  }
  function createElm(vnode: VNode, insertedVnodeQueue: VNodeQueue): Node {
    let i: any,
      iLen: number,
      data = vnode.data;
    if (data !== undefined) {
      if (isDef((i = data.hook)) && isDef((i = i.init))) {
        i(vnode);
        data = vnode.data;
      }
    }
    let children = vnode.children,
      sel = vnode.sel;
    if (sel === "!") {
      if (isUndef(vnode.text)) {
        vnode.text = "";
      }
      vnode.elm = api.createComment(vnode.text as string);
    } else if (sel !== undefined) {
      const elm =
        vnode.elm ||
        (vnode.elm =
          isDef(data) && isDef((i = (data as VNodeData).ns))
            ? api.createElementNS(i, sel)
            : api.createElement(sel));
      for (i = 0, iLen = cbs.create.length; i < iLen; ++i) cbs.create[i](emptyNode, vnode);
      if (array(children)) {
        for (i = 0, iLen = children.length; i < iLen; ++i) {
          const ch = children[i];
          if (ch != null) {
            api.appendChild(elm, createElm(ch as VNode, insertedVnodeQueue));
          }
        }
      } else if (primitive(vnode.text)) {
        api.appendChild(elm, api.createTextNode(vnode.text));
      }
      i = (vnode.data as VNodeData).hook; // Reuse variable
      if (isDef(i)) {
        if (i.create) i.create(emptyNode, vnode);
        if (i.insert) insertedVnodeQueue.push(vnode);
      }
    } else {
      vnode.elm = api.createTextNode(vnode.text as string);
    }
    return vnode.elm;
  }
  function addVnodes(
    parentElm: Node,
    before: Node | null,
    vnodes: Array<VNode>,
    startIdx: number,
    endIdx: number,
    insertedVnodeQueue: VNodeQueue
  ) {
    for (; startIdx <= endIdx; ++startIdx) {
      const ch = vnodes[startIdx];
      if (ch != null) {
        api.insertBefore(parentElm, createElm(ch, insertedVnodeQueue), before);
      }
    }
  }
  function invokeDestroyHook(vnode: VNode) {
    let i: any,
      iLen: number,
      j: number,
      jLen: number,
      data = vnode.data;
    if (data !== undefined) {
      if (isDef((i = data.hook)) && isDef((i = i.destroy))) i(vnode);
      for (i = 0, iLen = cbs.destroy.length; i < iLen; ++i) cbs.destroy[i](vnode);
      if (vnode.children !== undefined) {
        for (j = 0, jLen = vnode.children.length; j < jLen; ++j) {
          i = vnode.children[j];
          if (i != null && typeof i !== "string") {
            invokeDestroyHook(i);
          }
        }
      }
    }
  }
  function removeVnodes(
    parentElm: Node,
    vnodes: Array<VNode>,
    startIdx: number,
    endIdx: number
  ): void {
    for (; startIdx <= endIdx; ++startIdx) {
      let i: any,
        iLen: number,
        listeners: number,
        rm: () => void,
        ch = vnodes[startIdx];
      if (ch != null) {
        if (isDef(ch.sel)) {
          invokeDestroyHook(ch);
          listeners = cbs.remove.length + 1;
          rm = createRmCb(ch.elm as Node, listeners);
          for (i = 0, iLen = cbs.remove.length; i < iLen; ++i) cbs.remove[i](ch, rm);
          if (isDef((i = ch.data)) && isDef((i = i.hook)) && isDef((i = i.remove))) {
            i(ch, rm);
          } else {
            rm();
          }
        } else {
          // Text node
          api.removeChild(parentElm, ch.elm as Node);
        }
      }
    }
  }
  function updateChildren(
    parentElm: Node,
    oldCh: Array<VNode>,
    newCh: Array<VNode>,
    insertedVnodeQueue: VNodeQueue
  ) {
    let oldStartIdx = 0,
      newStartIdx = 0;
    let oldEndIdx = oldCh.length - 1;
    let oldStartVnode = oldCh[0];
    let oldEndVnode = oldCh[oldEndIdx];
    let newEndIdx = newCh.length - 1;
    let newStartVnode = newCh[0];
    let newEndVnode = newCh[newEndIdx];
    let oldKeyToIdx: any;
    let idxInOld: number;
    let elmToMove: VNode;
    let before: any;
    while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
      if (oldStartVnode == null) {
        oldStartVnode = oldCh[++oldStartIdx]; // Vnode might have been moved left
      } else if (oldEndVnode == null) {
        oldEndVnode = oldCh[--oldEndIdx];
      } else if (newStartVnode == null) {
        newStartVnode = newCh[++newStartIdx];
      } else if (newEndVnode == null) {
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldStartVnode, newStartVnode)) {
        patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
        oldStartVnode = oldCh[++oldStartIdx];
        newStartVnode = newCh[++newStartIdx];
      } else if (sameVnode(oldEndVnode, newEndVnode)) {
        patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
        oldEndVnode = oldCh[--oldEndIdx];
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldStartVnode, newEndVnode)) {
        // Vnode moved right
        patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
        api.insertBefore(
          parentElm,
          oldStartVnode.elm as Node,
          api.nextSibling(oldEndVnode.elm as Node)
        );
        oldStartVnode = oldCh[++oldStartIdx];
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldEndVnode, newStartVnode)) {
        // Vnode moved left
        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
        api.insertBefore(parentElm, oldEndVnode.elm as Node, oldStartVnode.elm as Node);
        oldEndVnode = oldCh[--oldEndIdx];
        newStartVnode = newCh[++newStartIdx];
      } else {
        if (oldKeyToIdx === undefined) {
          oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
        }
        idxInOld = oldKeyToIdx[newStartVnode.key as string];
        if (isUndef(idxInOld)) {
          // New element
          api.insertBefore(
            parentElm,
            createElm(newStartVnode, insertedVnodeQueue),
            oldStartVnode.elm as Node
          );
          newStartVnode = newCh[++newStartIdx];
        } else {
          elmToMove = oldCh[idxInOld];
          if (elmToMove.sel !== newStartVnode.sel) {
            api.insertBefore(
              parentElm,
              createElm(newStartVnode, insertedVnodeQueue),
              oldStartVnode.elm as Node
            );
          } else {
            patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
            oldCh[idxInOld] = undefined as any;
            api.insertBefore(parentElm, elmToMove.elm as Node, oldStartVnode.elm as Node);
          }
          newStartVnode = newCh[++newStartIdx];
        }
      }
    }
    if (oldStartIdx <= oldEndIdx || newStartIdx <= newEndIdx) {
      if (oldStartIdx > oldEndIdx) {
        before = newCh[newEndIdx + 1] == null ? null : newCh[newEndIdx + 1].elm;
        addVnodes(parentElm, before, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
      } else {
        removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
      }
    }
  }
  function patchVnode(oldVnode: VNode, vnode: VNode, insertedVnodeQueue: VNodeQueue) {
    let i: any, iLen: number, hook: any;
    if (isDef((i = vnode.data)) && isDef((hook = i.hook)) && isDef((i = hook.prepatch))) {
      i(oldVnode, vnode);
    }
    const elm = (vnode.elm = oldVnode.elm as Node);
    let oldCh = oldVnode.children;
    let ch = vnode.children;
    if (oldVnode === vnode) return;
    if (vnode.data !== undefined) {
      for (i = 0, iLen = cbs.update.length; i < iLen; ++i) cbs.update[i](oldVnode, vnode);
      i = vnode.data.hook;
      if (isDef(i) && isDef((i = i.update))) i(oldVnode, vnode);
    }
    if (isUndef(vnode.text)) {
      if (isDef(oldCh) && isDef(ch)) {
        if (oldCh !== ch)
          updateChildren(elm, oldCh as Array<VNode>, ch as Array<VNode>, insertedVnodeQueue);
      } else if (isDef(ch)) {
        if (isDef(oldVnode.text)) api.setTextContent(elm, "");
        addVnodes(
          elm,
          null,
          ch as Array<VNode>,
          0,
          (ch as Array<VNode>).length - 1,
          insertedVnodeQueue
        );
      } else if (isDef(oldCh)) {
        removeVnodes(elm, oldCh as Array<VNode>, 0, (oldCh as Array<VNode>).length - 1);
      } else if (isDef(oldVnode.text)) {
        api.setTextContent(elm, "");
      }
    } else if (oldVnode.text !== vnode.text) {
      if (isDef(oldCh)) {
        removeVnodes(elm, oldCh as Array<VNode>, 0, (oldCh as Array<VNode>).length - 1);
      }
      api.setTextContent(elm, vnode.text as string);
    }
    if (isDef(hook) && isDef((i = hook.postpatch))) {
      i(oldVnode, vnode);
    }
  }
  return function patch(oldVnode: VNode | Element, vnode: VNode): VNode {
    let i: number, iLen: number, elm: Node, parent: Node;
    const insertedVnodeQueue: VNodeQueue = [];
    for (i = 0, iLen = cbs.pre.length; i < iLen; ++i) cbs.pre[i]();
    if (!isVnode(oldVnode)) {
      oldVnode = emptyNodeAt(oldVnode);
    }
    if (sameVnode(oldVnode, vnode)) {
      patchVnode(oldVnode, vnode, insertedVnodeQueue);
    } else {
      elm = oldVnode.elm as Node;
      parent = api.parentNode(elm);
      createElm(vnode, insertedVnodeQueue);
      if (parent !== null) {
        api.insertBefore(parent, vnode.elm as Node, api.nextSibling(elm));
        removeVnodes(parent, [oldVnode], 0, 0);
      }
    }
    for (i = 0, iLen = insertedVnodeQueue.length; i < iLen; ++i) {
      (((insertedVnodeQueue[i].data as VNodeData).hook as Hooks).insert as any)(
        insertedVnodeQueue[i]
      );
    }
    for (i = 0, iLen = cbs.post.length; i < iLen; ++i) cbs.post[i]();
    return vnode;
  };
 }
 //------------------------------------------------------------------------------
 // is.ts
 //------------------------------------------------------------------------------
 const array = Array.isArray;
 function primitive(s: any): s is string | number {
  return typeof s === "string" || typeof s === "number";
 }
 //------------------------------------------------------------------------------
 // htmldomapi.ts
 //------------------------------------------------------------------------------
 interface DOMAPI {
  createElement: (tagName: any) => HTMLElement;
  createElementNS: (namespaceURI: string, qualifiedName: string) => Element;
  createTextNode: (text: string) => Text;
  createComment: (text: string) => Comment;
  insertBefore: (parentNode: Node, newNode: Node, referenceNode: Node | null) => void;
  removeChild: (node: Node, child: Node) => void;
  appendChild: (node: Node, child: Node) => void;
  parentNode: (node: Node) => Node;
  nextSibling: (node: Node) => Node;
  tagName: (elm: Element) => string;
  setTextContent: (node: Node, text: string | null) => void;
 }
 function createElement(tagName: any): HTMLElement {
  return document.createElement(tagName);
 }
 function createElementNS(namespaceURI: string, qualifiedName: string): Element {
  return document.createElementNS(namespaceURI, qualifiedName);
 }
 function createTextNode(text: string): Text {
  return document.createTextNode(text);
 }
 function createComment(text: string): Comment {
  return document.createComment(text);
 }
 function insertBefore(parentNode: Node, newNode: Node, referenceNode: Node | null): void {
  parentNode.insertBefore(newNode, referenceNode);
 }
 function removeChild(node: Node, child: Node): void {
  node.removeChild(child);
 }
 function appendChild(node: Node, child: Node): void {
  node.appendChild(child);
 }
 function parentNode(node: Node): Node | null {
  return node.parentNode;
 }
 function nextSibling(node: Node): Node | null {
  return node.nextSibling;
 }
 function tagName(elm: Element): string {
  return elm.tagName;
 }
 function setTextContent(node: Node, text: string | null): void {
  node.textContent = text;
 }
 const htmlDomApi = {
  createElement,
  createElementNS,
  createTextNode,
  createComment,
  insertBefore,
  removeChild,
  appendChild,
  parentNode,
  nextSibling,
  tagName,
  setTextContent
 } as DOMAPI;
 //------------------------------------------------------------------------------
 // hooks.ts
 //------------------------------------------------------------------------------
 type PreHook = () => any;
 type InitHook = (vNode: VNode) => any;
 type CreateHook = (emptyVNode: VNode, vNode: VNode) => any;
 type InsertHook = (vNode: VNode) => any;
 type PrePatchHook = (oldVNode: VNode, vNode: VNode) => any;
 type UpdateHook = (oldVNode: VNode, vNode: VNode) => any;
 type PostPatchHook = (oldVNode: VNode, vNode: VNode) => any;
 type DestroyHook = (vNode: VNode) => any;
 type RemoveHook = (vNode: VNode, removeCallback: () => void) => any;
 type PostHook = () => any;
 interface Hooks {
  pre?: PreHook;
  init?: InitHook;
  create?: CreateHook;
  insert?: InsertHook;
  prepatch?: PrePatchHook;
  update?: UpdateHook;
  postpatch?: PostPatchHook;
  destroy?: DestroyHook;
  remove?: RemoveHook;
  post?: PostHook;
 }
 //------------------------------------------------------------------------------
 // h.ts
 //------------------------------------------------------------------------------
 type VNodes = Array<VNode>;
 type VNodeChildElement = VNode | string | number | undefined | null;
 type ArrayOrElement<T> = T | T[];
 type VNodeChildren = ArrayOrElement<VNodeChildElement>;
 export function addNS(data: any, children: VNodes | undefined, sel: string | undefined): void {
  if (sel === "dummy") {
    // we do not need to add the namespace on dummy elements, they come from a
    // subcomponent, which will handle the namespace itself
    return;
  }
  data.ns = "http://www.w3.org/2000/svg";
  if (sel !== "foreignObject" && children !== undefined) {
    for (let i = 0, iLen = children.length; i < iLen; ++i) {
      const child = children[i];
      let childData = child.data;
      if (childData !== undefined) {
        addNS(childData, (child as VNode).children as VNodes, child.sel);
      }
    }
  }
 }
 export function h(sel: string): VNode;
 export function h(sel: string, data: VNodeData): VNode;
 export function h(sel: string, children: VNodeChildren): VNode;
 export function h(sel: string, data: VNodeData, children: VNodeChildren): VNode;
 export function h(sel: any, b?: any, c?: any): VNode {
  var data: VNodeData = {},
    children: any,
    text: any,
    i: number,
    iLen: number;
  if (c !== undefined) {
    data = b;
    if (array(c)) {
      children = c;
    } else if (primitive(c)) {
      text = c;
    } else if (c && c.sel) {
      children = [c];
    }
  } else if (b !== undefined) {
    if (array(b)) {
      children = b;
    } else if (primitive(b)) {
      text = b;
    } else if (b && b.sel) {
      children = [b];
    } else {
      data = b;
    }
  }
  if (children !== undefined) {
    for (i = 0, iLen = children.length; i < iLen; ++i) {
      if (primitive(children[i]))
        children[i] = vnode(undefined, undefined, undefined, children[i], undefined);
    }
  }
  return vnode(sel, data, children, text, undefined);
 }
@@ -0,0 +1,183 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 exports[`animations t-transition combined with component 1`] = `
 "function anonymous(context,extra
 ) {
    let utils = this.constructor.utils;
    let QWeb = this.constructor;
    let parent = context;
    let owner = context;
    var h = this.h;
    let c1 = [], p1 = {key:1};
    var vn1 = h('div', p1, c1);
    //COMPONENT
    let k4 = \`__5__\`;
    let w3 = k4 in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap[k4]] : false;
    let props3 = {};
    if (w3 && w3.__owl__.currentFiber && !w3.__owl__.vnode) {
        w3.destroy();
        w3 = false;
    }
    if (w3) {
        w3.__updateProps(props3, extra.fiber, undefined, undefined);
        let pvnode = w3.__owl__.pvnode;
        c1.push(pvnode);
    } else {
        let componentKey3 = \`Child\`;
        let W3 = context.constructor.components[componentKey3] || QWeb.components[componentKey3]|| context['Child'];
        if (!W3) {throw new Error('Cannot find the definition of component \\"' + componentKey3 + '\\"')}
        w3 = new W3(parent, props3);
        const __patch3 = w3.__patch;
        w3.__patch = fiber => {__patch3.call(w3, fiber); if(!w3.__owl__.transitionInserted){w3.__owl__.transitionInserted = true;utils.transitionInsert(w3.__owl__.vnode, 'chimay');}};
        parent.__owl__.cmap[k4] = w3.__owl__.id;
        let def2 = w3.__prepare(extra.fiber, undefined, undefined);
        let pvnode = h('dummy', {key: k4, hook: {remove() {},destroy(vn) {let finalize = () => {
          w3.destroy();
        };
        delete w3.__owl__.transitionInserted;
        utils.transitionRemove(vn, 'chimay', finalize);}}});
        const fiber = w3.__owl__.currentFiber;
        def2.then(function () { if (fiber.isCompleted) { return; } const vnode = fiber.vnode; pvnode.sel = vnode.sel; });
        c1.push(pvnode);
        w3.__owl__.pvnode = pvnode;
    }
    w3.__owl__.parentLastFiberId = extra.fiber.id;
    return vn1;
 }"
 `;
 exports[`animations t-transition combined with t-component and t-if 1`] = `
 "function anonymous(context,extra
 ) {
    let utils = this.constructor.utils;
    let QWeb = this.constructor;
    let parent = context;
    let owner = context;
    var h = this.h;
    let c1 = [], p1 = {key:1};
    var vn1 = h('div', p1, c1);
    if (context['state'].display) {
        //COMPONENT
        let k4 = \`__5__\`;
        let w3 = k4 in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap[k4]] : false;
        let props3 = {};
        if (w3 && w3.__owl__.currentFiber && !w3.__owl__.vnode) {
            w3.destroy();
            w3 = false;
        }
        if (w3) {
            w3.__updateProps(props3, extra.fiber, undefined, undefined);
            let pvnode = w3.__owl__.pvnode;
            c1.push(pvnode);
        } else {
            let componentKey3 = \`Child\`;
            let W3 = context.constructor.components[componentKey3] || QWeb.components[componentKey3]|| context['Child'];
            if (!W3) {throw new Error('Cannot find the definition of component \\"' + componentKey3 + '\\"')}
            w3 = new W3(parent, props3);
            const __patch3 = w3.__patch;
            w3.__patch = fiber => {__patch3.call(w3, fiber); if(!w3.__owl__.transitionInserted){w3.__owl__.transitionInserted = true;utils.transitionInsert(w3.__owl__.vnode, 'chimay');}};
            parent.__owl__.cmap[k4] = w3.__owl__.id;
            let def2 = w3.__prepare(extra.fiber, undefined, undefined);
            let pvnode = h('dummy', {key: k4, hook: {remove() {},destroy(vn) {let finalize = () => {
          w3.destroy();
        };
        delete w3.__owl__.transitionInserted;
        utils.transitionRemove(vn, 'chimay', finalize);}}});
            const fiber = w3.__owl__.currentFiber;
            def2.then(function () { if (fiber.isCompleted) { return; } const vnode = fiber.vnode; pvnode.sel = vnode.sel; });
            c1.push(pvnode);
            w3.__owl__.pvnode = pvnode;
        }
        w3.__owl__.parentLastFiberId = extra.fiber.id;
    }
    return vn1;
 }"
 `;
 exports[`animations t-transition combined with t-component, remove and re-add before transitionend 1`] = `
 "function anonymous(context,extra
 ) {
    let utils = this.constructor.utils;
    let QWeb = this.constructor;
    let parent = context;
    let owner = context;
    var h = this.h;
    let c1 = [], p1 = {key:1};
    var vn1 = h('div', p1, c1);
    if (context['state'].flag) {
        //COMPONENT
        let k4 = \`__5__\`;
        let w3 = k4 in parent.__owl__.cmap ? parent.__owl__.children[parent.__owl__.cmap[k4]] : false;
        let props3 = {};
        if (w3 && w3.__owl__.currentFiber && !w3.__owl__.vnode) {
            w3.destroy();
            w3 = false;
        }
        if (w3) {
            w3.__updateProps(props3, extra.fiber, undefined, undefined);
            let pvnode = w3.__owl__.pvnode;
            c1.push(pvnode);
        } else {
            let componentKey3 = \`Child\`;
            let W3 = context.constructor.components[componentKey3] || QWeb.components[componentKey3]|| context['Child'];
            if (!W3) {throw new Error('Cannot find the definition of component \\"' + componentKey3 + '\\"')}
            w3 = new W3(parent, props3);
            const __patch3 = w3.__patch;
            w3.__patch = fiber => {__patch3.call(w3, fiber); if(!w3.__owl__.transitionInserted){w3.__owl__.transitionInserted = true;utils.transitionInsert(w3.__owl__.vnode, 'chimay');}};
            parent.__owl__.cmap[k4] = w3.__owl__.id;
            let def2 = w3.__prepare(extra.fiber, undefined, undefined);
            let pvnode = h('dummy', {key: k4, hook: {remove() {},destroy(vn) {let finalize = () => {
          w3.destroy();
        };
        delete w3.__owl__.transitionInserted;
        utils.transitionRemove(vn, 'chimay', finalize);}}});
            const fiber = w3.__owl__.currentFiber;
            def2.then(function () { if (fiber.isCompleted) { return; } const vnode = fiber.vnode; pvnode.sel = vnode.sel; });
            c1.push(pvnode);
            w3.__owl__.pvnode = pvnode;
        }
        w3.__owl__.parentLastFiberId = extra.fiber.id;
    }
    return vn1;
 }"
 `;
 exports[`animations t-transition with no delay/duration 1`] = `
 "function anonymous(context,extra
 ) {
    let utils = this.constructor.utils;
    var h = this.h;
    let c1 = [], p1 = {key:1};
    var vn1 = h('span', p1, c1);
    p1.hook = {
      insert: vn => {
        utils.transitionInsert(vn, 'jupiler');
      },
      remove: (vn, rm) => {
        utils.transitionRemove(vn, 'jupiler', rm);
      },
    };
    c1.push({text: \`blue\`});
    return vn1;
 }"
 `;
 exports[`animations t-transition, on a simple node (insert) 1`] = `
 "function anonymous(context,extra
 ) {
    let utils = this.constructor.utils;
    var h = this.h;
    let c1 = [], p1 = {key:1};
    var vn1 = h('span', p1, c1);
    p1.hook = {
      insert: vn => {
        utils.transitionInsert(vn, 'chimay');
      },
      remove: (vn, rm) => {
        utils.transitionRemove(vn, 'chimay', rm);
      },
    };
    c1.push({text: \`blue\`});
    return vn1;
 }"
 `;
@@ -1,384 +0,0 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 exports[`Reactivity: useState concurrent renderings 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<span><block-text-0/><block-text-1/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let d1 = ctx['context'][ctx['props'].key].n;
    let d2 = ctx['state'].x;
    return block1([d1, d2]);
  }
 }"
 `;
 exports[`Reactivity: useState concurrent renderings 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<p><block-child-0/></p>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`ComponentC\`, {key: ctx['props'].key}, key + \`__1\`, node, ctx);
    return block1([], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState concurrent renderings 3`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<div><block-child-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`ComponentB\`, {key: ctx['context'].key}, key + \`__1\`, node, ctx);
    return block1([], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState destroyed component before being mounted is inactive 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2;
    if (ctx['state'].flag) {
      b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    }
    return block1([], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState destroyed component before being mounted is inactive 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<span><block-text-0/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].a;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState destroyed component is inactive 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2;
    if (ctx['state'].flag) {
      b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    }
    return block1([], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState destroyed component is inactive 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<span><block-text-0/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].a;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState one components can subscribe twice to same context 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-text-0/><block-text-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj1'].a;
    let txt2 = ctx['contextObj2'].b;
    return block1([txt1, txt2]);
  }
 }"
 `;
 exports[`Reactivity: useState parent and children subscribed to same context 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/><block-text-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    let txt1 = ctx['contextObj'].b;
    return block1([txt1], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState parent and children subscribed to same context 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<span><block-text-0/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].a;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState several nodes on different level use same context 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<div><block-text-0/> <block-text-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let d1 = ctx['contextObj'].a;
    let d2 = ctx['contextObj'].b;
    return block1([d1, d2]);
  }
 }"
 `;
 exports[`Reactivity: useState several nodes on different level use same context 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<div><block-text-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let d1 = ctx['contextObj'].b;
    return block1([d1]);
  }
 }"
 `;
 exports[`Reactivity: useState several nodes on different level use same context 3`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<div><block-text-0/><block-child-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let d1 = ctx['contextObj'].a;
    let b2 = component(\`L3A\`, {}, key + \`__1\`, node, ctx);
    return block1([d1], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState several nodes on different level use same context 4`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component } = bdom;
  let { withDefault, getTemplate, prepareList, withKey, zero, call, callSlot, capture, isBoundary, shallowEqual, setContextValue, toNumber, safeOutput } = helpers;
  let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`L2A\`, {}, key + \`__1\`, node, ctx);
    let b3 = component(\`L2B\`, {}, key + \`__2\`, node, ctx);
    return block1([], [b2, b3]);
  }
 }"
 `;
 exports[`Reactivity: useState two components are updated in parallel 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    let b3 = component(\`Child\`, {}, key + \`__2\`, node, ctx);
    return block1([], [b2, b3]);
  }
 }"
 `;
 exports[`Reactivity: useState two components are updated in parallel 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<span><block-text-0/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].value;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState two components can subscribe to same context 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    let b3 = component(\`Child\`, {}, key + \`__2\`, node, ctx);
    return block1([], [b2, b3]);
  }
 }"
 `;
 exports[`Reactivity: useState two components can subscribe to same context 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<span><block-text-0/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].value;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState two independent components on different levels are updated in parallel 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    let b3 = component(\`Parent\`, {}, key + \`__2\`, node, ctx);
    return block1([], [b2, b3]);
  }
 }"
 `;
 exports[`Reactivity: useState two independent components on different levels are updated in parallel 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<span><block-text-0/></span>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].value;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState two independent components on different levels are updated in parallel 3`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-child-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let b2 = component(\`Child\`, {}, key + \`__1\`, node, ctx);
    return block1([], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState useContext=useState hook is reactive, for one component 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-text-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].value;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState useless atoms should be deleted 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let { prepareList, withKey } = helpers;
  let block1 = createBlock(\`<div><block-child-0/> Total: <block-text-0/> Count: <block-text-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    ctx = Object.create(ctx);
    const [k_block2, v_block2, l_block2, c_block2] = prepareList(Object.keys(ctx['state']));
    for (let i1 = 0; i1 < l_block2; i1++) {
      ctx[\`id\`] = v_block2[i1];
      let key1 = ctx['id'];
      c_block2[i1] = withKey(component(\`Quantity\`, {id: ctx['id']}, key + \`__1__\${key1}\`, node, ctx), key1);
    }
    ctx = ctx.__proto__;
    let b2 = list(c_block2);
    let txt1 = ctx['total'];
    let txt2 = Object.keys(ctx['state']).length;
    return block1([txt1, txt2], [b2]);
  }
 }"
 `;
 exports[`Reactivity: useState useless atoms should be deleted 2`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-text-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['state'].quantity;
    return block1([txt1]);
  }
 }"
 `;
 exports[`Reactivity: useState very simple use, with initial value 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-text-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['contextObj'].value;
    return block1([txt1]);
  }
 }"
 `;
@@ -0,0 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 exports[`various scenarios scenarios with async store updates and some components events 1`] = `"<div><button>Do stuff</button><div><span>Attachment 100</span><span>Name: text.txt</span></div></div>"`;
 exports[`various scenarios scenarios with async store updates and some components events 2`] = `"<div><button>Do stuff</button></div>"`;
@@ -0,0 +1,429 @@
 import { Component, Env } from "../src/component/component";
 import { QWeb } from "../src/qweb/index";
 import { useState, useRef } from "../src/hooks";
 import { xml } from "../src/tags";
 import {
  makeDeferred,
  makeTestFixture,
  makeTestEnv,
  patchNextFrame,
  renderToDOM,
  unpatchNextFrame,
  nextTick
 } from "./helpers";
 //------------------------------------------------------------------------------
 // Setup and helpers
 //------------------------------------------------------------------------------
 // We create before each test:
 // - fixture: a div, appended to the DOM, intended to be the target of dom
 //   manipulations.  Note that it is removed after each test.
 // - qweb: a new QWeb instance
 // - env: a WEnv, necessary to create new components
 // - cssEl: a stylesheet injected into the dom
 let fixture: HTMLElement;
 let qweb: QWeb;
 let env: Env;
 let cssEl: HTMLElement;
 beforeEach(() => {
  fixture = makeTestFixture();
  env = makeTestEnv();
  Component.env = env;
  qweb = new QWeb();
 });
 afterEach(() => {
  fixture.remove();
 });
 class Widget extends Component<any, any> {}
 //------------------------------------------------------------------------------
 // Tests
 //------------------------------------------------------------------------------
 describe("animations", () => {
  beforeEach(() => {
    cssEl = document.createElement("style");
    let css = `
      .chimay-enter-active, .chimay-leave-active {
        transition-property: opacity;
        transition-duration: 0.1s;
      }
      .chimay-enter, .chimay-leave-to {
        opacity: 0;
      }
    `;
    cssEl.textContent = css.trim();
    document.head.appendChild(cssEl);
  });
  afterEach(() => {
    document.head.removeChild(cssEl);
    unpatchNextFrame();
  });
  test("t-transition, on a simple node (insert)", async () => {
    expect.assertions(5);
    qweb.addTemplate("test", `<span t-transition="chimay">blue</span>`);
    let def = makeDeferred();
    patchNextFrame(cb => {
      expect(node.className).toBe("chimay-enter chimay-enter-active");
      cb();
      expect(node.className).toBe("chimay-enter-active chimay-enter-to");
      def.resolve();
    });
    let node: HTMLElement = <HTMLElement>renderToDOM(qweb, "test");
    expect(node.className).toBe("chimay-enter chimay-enter-active");
    await def; // wait for the mocked repaint to be done
    node.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(node.className).toBe("");
  });
  test("t-transition with no delay/duration", async () => {
    expect.assertions(4);
    qweb.addTemplate("test", `<span t-transition="jupiler">blue</span>`);
    let def = makeDeferred();
    patchNextFrame(cb => {
      expect(node.className).toBe("jupiler-enter jupiler-enter-active");
      cb();
      expect(node.className).toBe("");
      def.resolve();
    });
    let node: HTMLElement = <HTMLElement>renderToDOM(qweb, "test");
    expect(node.className).toBe("jupiler-enter jupiler-enter-active");
    await def;
  });
  test("t-transition on a conditional node", async () => {
    expect.assertions(7);
    env.qweb.addTemplate(
      "TestWidget",
      `<div><span t-if="!state.hide" t-transition="chimay">blue</span></div>`
    );
    class TestWidget extends Widget {
      state = useState({ hide: false });
    }
    const widget = new TestWidget();
    // insert widget into the DOM
    let def = makeDeferred();
    var spanNode;
    patchNextFrame(cb => {
      expect(spanNode.className).toBe("chimay-enter chimay-enter-active");
      cb();
      expect(spanNode.className).toBe("chimay-enter-active chimay-enter-to");
      def.resolve();
    });
    await widget.mount(fixture);
    spanNode = widget.el!.children[0];
    expect(spanNode.className).toBe("chimay-enter chimay-enter-active");
    await def; // wait for the mocked repaint to be done
    spanNode.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(spanNode.className).toBe("");
    // remove span from the DOM
    def = makeDeferred();
    widget.state.hide = true;
    patchNextFrame(cb => {
      expect(spanNode.className).toBe("chimay-leave chimay-leave-active");
      cb();
      expect(spanNode.className).toBe("chimay-leave-active chimay-leave-to");
      def.resolve();
    });
    await def; // wait for the mocked repaint to be done
    spanNode.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(spanNode.className).toBe("");
  });
  test("t-transition combined with t-ref", async () => {
    expect.assertions(5);
    env.qweb.addTemplate(
      "TestWidget",
      `<div><span t-ref="span" t-transition="chimay">blue</span></div>`
    );
    class TestWidget extends Widget {
      state = useState({ hide: false });
      span = useRef("span");
    }
    const widget = new TestWidget();
    // insert widget into the DOM
    let def = makeDeferred();
    var spanNode;
    patchNextFrame(cb => {
      expect(spanNode.className).toBe("chimay-enter chimay-enter-active");
      cb();
      expect(spanNode.className).toBe("chimay-enter-active chimay-enter-to");
      def.resolve();
    });
    await widget.mount(fixture);
    spanNode = widget.el!.children[0];
    expect(widget.span.el).toBe(spanNode);
    expect(spanNode.className).toBe("chimay-enter chimay-enter-active");
    await def; // wait for the mocked repaint to be done
    spanNode.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(spanNode.className).toBe("");
  });
  test("t-transition combined with component", async () => {
    expect.assertions(5);
    env.qweb.addTemplate("Parent", `<div><Child t-transition="chimay"/></div>`);
    env.qweb.addTemplate("Child", `<span>blue</span>`);
    class Child extends Widget {}
    class Parent extends Widget {
      static components = { Child: Child };
    }
    const widget = new Parent();
    let def = makeDeferred();
    var spanNode;
    patchNextFrame(cb => {
      expect(fixture.innerHTML).toBe(
        '<div><span class="chimay-enter chimay-enter-active">blue</span></div>'
      );
      cb();
      expect(fixture.innerHTML).toBe(
        '<div><span class="chimay-enter-active chimay-enter-to">blue</span></div>'
      );
      def.resolve();
    });
    await widget.mount(fixture);
    spanNode = widget.el!.children[0];
    expect(env.qweb.templates.Parent.fn.toString()).toMatchSnapshot();
    expect(fixture.innerHTML).toBe(
      '<div><span class="chimay-enter chimay-enter-active">blue</span></div>'
    );
    await def; // wait for the mocked repaint to be done
    spanNode.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe('<div><span class="">blue</span></div>');
  });
  test("t-transition combined with t-component and t-if", async () => {
    expect.assertions(8);
    env.qweb.addTemplate(
      "Parent",
      `<div><t t-if="state.display" t-component="Child" t-transition="chimay"/></div>`
    );
    env.qweb.addTemplate("Child", `<span>blue</span>`);
    class Child extends Widget {}
    class Parent extends Widget {
      static components = { Child: Child };
      state = useState({ display: true });
    }
    const widget = new Parent();
    let def = makeDeferred();
    var spanNode;
    patchNextFrame(cb => {
      expect(fixture.innerHTML).toBe(
        '<div><span class="chimay-enter chimay-enter-active">blue</span></div>'
      );
      cb();
      expect(fixture.innerHTML).toBe(
        '<div><span class="chimay-enter-active chimay-enter-to">blue</span></div>'
      );
      def.resolve();
    });
    await widget.mount(fixture);
    spanNode = widget.el!.children[0];
    expect(env.qweb.templates.Parent.fn.toString()).toMatchSnapshot();
    expect(fixture.innerHTML).toBe(
      '<div><span class="chimay-enter chimay-enter-active">blue</span></div>'
    );
    await def; // wait for the mocked repaint to be done
    spanNode.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe('<div><span class="">blue</span></div>');
    // remove span from the DOM
    def = makeDeferred();
    widget.state.display = false;
    patchNextFrame(cb => {
      expect(fixture.innerHTML).toBe(
        '<div><span class="chimay-leave chimay-leave-active" data-owl-key="__5__">blue</span></div>'
      );
      cb();
      expect(fixture.innerHTML).toBe(
        '<div><span class="chimay-leave-active chimay-leave-to" data-owl-key="__5__">blue</span></div>'
      );
      def.resolve();
    });
    await def; // wait for the mocked repaint to be done
    spanNode.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe("<div></div>");
  });
  test("t-transition, remove and re-add before transitionend", async () => {
    expect.assertions(11);
    env.qweb.addTemplates(
      `<templates>
        <div t-name="Parent">
          <button t-on-click="toggle">Toggle</button>
          <span t-if="state.flag" t-transition="chimay">blue</span>
        </div>
      </templates>`
    );
    class Parent extends Widget {
      state = useState({ flag: false });
      toggle() {
        this.state.flag = !this.state.flag;
      }
    }
    const widget = new Parent();
    await widget.mount(fixture);
    let button = widget.el!.querySelector("button");
    let def = makeDeferred();
    let phase = "enter";
    patchNextFrame(cb => {
      let spans = fixture.querySelectorAll("span");
      expect(spans.length).toBe(1);
      expect(spans[0].className).toBe(`chimay-${phase} chimay-${phase}-active`);
      cb();
      expect(spans[0].className).toBe(`chimay-${phase}-active chimay-${phase}-to`);
      def.resolve();
    });
    // click display the span
    button!.click();
    await def; // wait for the mocked repaint to be done
    widget.el!.querySelector("span")!.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe('<div><button>Toggle</button><span class="">blue</span></div>');
    // click to remove the span, and click again to re-add it before transitionend
    def = makeDeferred();
    phase = "leave";
    button!.click();
    await def; // wait for the mocked repaint to be done
    def = makeDeferred();
    phase = "enter";
    button!.click();
    await def; // wait for the mocked repaint to be done
    widget.el!.querySelector("span")!.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe('<div><button>Toggle</button><span class="">blue</span></div>');
  });
  test("t-transition combined with t-component, remove and re-add before transitionend", async () => {
    expect.assertions(12);
    class Child extends Widget {
      static template = xml`<span>blue</span>`;
    }
    class Parent extends Widget {
      static template = xml`
        <div t-name="Parent">
          <t t-if="state.flag" t-component="Child" t-transition="chimay"/>
        </div>`;
      static components = { Child };
      state = useState({ flag: false });
    }
    const widget = new Parent();
    await widget.mount(fixture);
    expect(env.qweb.templates[Parent.template].fn.toString()).toMatchSnapshot();
    let def = makeDeferred();
    let phase = "enter";
    patchNextFrame(cb => {
      let spans = fixture.querySelectorAll("span");
      expect(spans.length).toBe(1);
      expect(spans[0].className).toBe(`chimay-${phase} chimay-${phase}-active`);
      cb();
      expect(spans[0].className).toBe(`chimay-${phase}-active chimay-${phase}-to`);
      def.resolve();
    });
    // display the span
    widget.state.flag = true;
    await def; // wait for the mocked repaint to be done
    widget.el!.querySelector("span")!.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe('<div><span class="">blue</span></div>');
    // click to remove the span, and click again to re-add it before transitionend
    def = makeDeferred();
    phase = "leave";
    widget.state.flag = false;
    await def; // wait for the mocked repaint to be done
    def = makeDeferred();
    phase = "enter";
    widget.state.flag = true;
    await def; // wait for the mocked repaint to be done
    widget.el!.querySelector("span")!.dispatchEvent(new Event("transitionend")); // mock end of css transition
    expect(fixture.innerHTML).toBe('<div><span class="" data-owl-key="__5__">blue</span></div>');
  });
  test("transitionInsert is called the correct amount of times", async () => {
    const oldTransitionInsert = QWeb.utils.transitionInsert;
    QWeb.utils.transitionInsert = jest.fn(oldTransitionInsert);
    class Child extends Widget {
      static template = xml`<span>blue</span>`;
    }
    class Parent extends Widget {
      static template = xml`
        <div t-name="Parent">
          <Child t-if="state.flag" t-transition="chimay"/>
        </div>`;
      static components = { Child };
      state = useState({ flag: false });
    }
    patchNextFrame(cb => cb());
    const widget = new Parent();
    await widget.mount(fixture);
    widget.state.flag = true;
    await nextTick();
    widget.el!.querySelector("span")!.dispatchEvent(new Event("transitionend"));
    expect(fixture.innerHTML).toBe('<div><span class="">blue</span></div>');
    expect(QWeb.utils.transitionInsert).toBeCalledTimes(1);
    widget.state.flag = false;
    await nextTick();
    expect(fixture.innerHTML).toBe(
      '<div><span class="chimay-leave-active chimay-leave-to" data-owl-key="__5__">blue</span></div>'
    );
    expect(QWeb.utils.transitionInsert).toBeCalledTimes(1);
    widget.state.flag = true;
    await nextTick();
    expect(fixture.innerHTML).toBe(
      '<div><span class="chimay-enter-active chimay-enter-to" data-owl-key="__5__">blue</span></div>'
    );
    expect(QWeb.utils.transitionInsert).toBeCalledTimes(2);
    widget.state.flag = false;
    await nextTick();
    widget.state.flag = true;
    await nextTick();
    expect(QWeb.utils.transitionInsert).toBeCalledTimes(3);
    widget.el!.querySelector("span")!.dispatchEvent(new Event("transitionend"));
    expect(fixture.innerHTML).toBe('<div><span class="" data-owl-key="__5__">blue</span></div>');
    QWeb.utils.transitionInsert = oldTransitionInsert;
  });
 });
@@ -1,43 +0,0 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 exports[`app App supports env with getters/setters 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-text-0/> <block-text-1/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['env'].someVal;
    let txt2 = Object.keys(ctx['env'].services);
    return block1([txt1, txt2]);
  }
 }"
 `;
 exports[`app can configure an app with props 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div><block-text-0/></div>\`);
  return function template(ctx, node, key = \\"\\") {
    let txt1 = ctx['props'].value;
    return block1([txt1]);
  }
 }"
 `;
 exports[`app destroy remove the widget from the DOM 1`] = `
 "function anonymous(bdom, helpers
 ) {
  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
  let block1 = createBlock(\`<div/>\`);
  return function template(ctx, node, key = \\"\\") {
    return block1();
  }
 }"
 `;
--- a/Show More
+++ b/Show More