[WIP] transitions in user space: playground

[FIX] slots: properly bind this in t-on arrow functions
[REF] component: small cleanup
2025-10-06 19:59:41 +07:00 · 2021-11-25 18:04:54 +01:00 · 2021-11-25 14:45:30 +01:00 · 2021-11-25 11:34:23 +01:00 · 2021-11-25 11:12:31 +01:00 · 2021-11-24 15:47:51 +01:00
276 changed files with 54566 additions and 47240 deletions
@@ -0,0 +1,27 @@
 # 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
@@ -1,5 +1,6 @@
 /node_modules
 /dist
 npm-debug.log
 # misc
@@ -14,8 +15,20 @@ yarn-debug.log*
 yarn-error.log*
 package-lock.json
 yarn.lock
 #ide's
 .vscode
 .idea
 node_modules
 # Extras temp file
-/extras/owl.js
+/tools/owl.js
 release-notes.md
 .rpt2_cache
 # useful in some cases
 /temp
@@ -0,0 +1,588 @@
 # 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))
 ## 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
 ```
@@ -0,0 +1,14 @@
 Most of the files are
  Copyright (c) 2004-2015 Odoo S.A.
 Many files also contain contributions from third
 parties. In this case the original copyright of
 the contributions can be traced through the
 history of the source version control system.
 When that is not the case, the files contain a prominent
 notice stating the original copyright and applicable
 license, or come with their own dedicated COPYRIGHT
 and/or LICENSE file.
@@ -1,19 +1,85 @@
-<h1 align="center">🦉 <a href="https://odoo.github.io/owl/">Odoo Web Library</a> 🦉</h1>
+<h1 align="center">🦉 <a href="https://odoo.github.io/owl/">OWL Framework</a> 🦉</h1>
-_A web framework for structured, dynamic and maintainable applications_
+ [![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_
 ## Project Overview
-The Odoo Web Library (OWL) is a small
+The Odoo Web Library (OWL) is a smallish (~<20kb gzipped) UI framework intended to
-UI framework intended to be the basis for the [Odoo](https://www.odoo.com/) Web Client, and hopefully many
+be the basis for the [Odoo](https://www.odoo.com/) Web Client. Owl is a modern
-other Odoo related projects. OWL's main feature is a _declarative component system_, with QWeb as a template engine, asynchronous rendering, and an underlying virtual dom.
+framework, written in Typescript, taking the best ideas from React and Vue in a
 simple and consistent way. Owl's main features are:
-**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.
+- a declarative component system,
 - a reactivity system based on hooks,
 - concurrent mode by default,
-## OWL's design principles
+Owl components are defined with ES6 classes, they use QWeb templates, an
 underlying virtual DOM, integrates beautifully with hooks, and the rendering is
 asynchronous.
 **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.
 Owl is currently stable.  Possible future changes are explained in the
 [roadmap](roadmap.md).
 ## Why Owl?
 Why did Odoo decide to make Yet Another Framework?  This is really a question
 that deserves [a long answer](doc/miscellaneous/why_owl.md). But in short, we believe that
 while the current state of the art frameworks are excellent, they are not
 optimized for our use case, and there is still room for something else.
 If you are interested in a comparison with React or Vue, you will
 find some more additional information [here](doc/miscellaneous/comparison.md).
 ## Example
 Here is a short example to illustrate interactive components:
 ```javascript
 const { Component, useState, mount } = owl;
 const { xml } = owl.tags;
 class Counter extends Component {
  static template = xml`
    <button t-on-click="state.value++">
      Click Me! [<t t-esc="state.value"/>]
    </button>`;
  state = useState({ value: 0 });
 }
 class App extends Component {
  static template = xml`
    <div>
      <span>Hello Owl</span>
      <Counter />
    </div>`;
  static components = { Counter };
 }
 mount(App, { target: document.body });
 ```
 Note that the counter component is made reactive with the [`useState` hook](doc/reference/hooks.md#usestate).
 Also, all examples here uses the [`xml` helper](doc/reference/tags.md#xml-tag) to define inline templates.
 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, code needs to be maintained by large teams.
+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
@@ -26,62 +92,39 @@ requirements are common, code needs to be maintained by large teams.
  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 or small (even though it is quite good on those
+Owl is not designed to be fast nor small (even though it is quite good on those
-two topics). If you are interested in a comparison with React or Vue, you will
+two topics). It is a no nonsense framework to build applications. There is only
-find some more information [here](doc/comparison.md).
+one way to define components (with classes). There is no black magic. It just
 works.
 # Example
 Here is a short example to illustrate interactive widgets:
 ```javascript
 class ClickCounter extends owl.Component {
  state = { value: 0 };
  increment() {
    this.state.value++;
  }
 }
 const TEMPLATES = `
    <button t-name="ClickCounter" t-on-click="increment">
        Click Me! [<t t-esc="state.value"/>]
    </button>`;
 const qweb = new owl.QWeb(TEMPLATES);
 const counter = new ClickCounter({ qweb });
 counter.mount(document.body);
 ```
 More interesting examples can be found on the [playground](https://odoo.github.io/owl/playground) application.
 ## Installing/Building
 If you want to use a simple `<script>` tag, the last release can be downloaded here:
 - [owl-0.11.0.js](https://github.com/odoo/owl/releases/download/v0.11.0/owl.js)
 - [owl-0.11.0.min.js](https://github.com/odoo/owl/releases/download/v0.11.0/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 tests                                                                   |
 | `npm run test:watch`   | run all tests, and keep a watcher                                               |
 | `npm run extras`       | build extras applications, start a static server (see [here](extras/readme.md)) |
 | `npm run extras:watch` | same as `extras`, but with a watcher to rebuild owl                             |
 ## Documentation
-The complete documentation can be found [here](doc/readme.md). The most important sections are:
+A complete documentation for Owl can be found here:
- [Quick Start](doc/quick_start.md)
+- [Main documentation page](doc/readme.md).
- [Component](doc/component.md)
+
- [QWeb](doc/qweb.md)
+Some of the most important pages are:
 - [Tutorial: TodoList application](doc/learning/tutorial_todoapp.md)
 - [How to start an Owl project](doc/learning/quick_start.md)
 - [QWeb templating language](doc/reference/qweb_templating_language.md)
 - [Component](doc/reference/component.md)
 - [Hooks](doc/reference/hooks.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)
 ## License
-OWL is [GPL licensed](./LICENSE).
+OWL is [LGPL licensed](./LICENSE).
@@ -1,39 +0,0 @@
 # 🦉 Animations 🦉
 Animation is a complex topic. There are many different use cases, and many
 solutions and technologies.
 ## Simple CSS effects
 Sometimes, using pure CSS is enough.  For these use cases, Owl is not really
 necessary: it just needs to render a DOM element with a specific class. For
 example:
 ```xml
 <button class="flash" t-on-click="doSomething">Click</button>
 ```
 with the following CSS:
 ```css
 .flash {
  transition: background 0.5s;
 }
 .flash:active {
  background-color: #41454a;
  transition: background 0s;
 }
 ```
 will produce a nice flash effect whenever the user click (or activate with the
 keyboard) the button.
 ## CSS Transitions (single element)
 A more complex situation occurs when we want to transition an element in or out
 of the page.  For example, we may want a fade-in and fade-out effect.
 The `t-transition` directive is here to help us (see [QWeb documentation](doc/qweb.md#t-transition-directive)).
@@ -1,194 +0,0 @@
 # Comparison with Vue/React
 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, some
 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.
 - [Size](#size)
 - [Tooling/Build Step](#toolingbuild-step)
 - [Templating](#templating)
 - [Asynchronous rendering](#asynchronous-rendering)
 - [Reactiveness](#reactiveness)
 - [State Management](#state-management)
 ### Size
 OWL is intended to be small and to work at a slightly lower level of abstraction
 than React and Vue. Also, jQuery is not the same kind of framework, but it is interesting to compare.
 | Framework                | Size (minified) | Size (minified, gzipped) |
 | ------------------------ | --------------- | ------------------------ |
 | OWL                      | 32kb            | 11kb                     |
 | Vue + VueX               |                 | 30kb                     |
 | React + ReactDOM + Redux |                 | 40kb                     |
 | jQuery                   | 86kb            | 30kb                     |
 ### Tooling/Build step
 OWL is designed to be easy to use in a standalone way. For various reasons,
 Odoo does not want to rely on standard web tools (such as webpack), and OWL can
 be used by simply adding a script tag to a page.
 ```html
 <script src="owl.min.js" />
 ```
 In comparison, React encourages using JSX,
 which necessitate a build step, and most Vue applications uses single file
 components, which also necessitate a build step.
 On the flipside, external tooling may make it harder to use in some case, but it
 also brings a lot of benefits. And React/Vue have both a large ecosystem.
 ### Templating
 OWL uses its own QWeb engine, which compiles templates on the
 frontend, as they are needed. This is extremely convenient for our use case, in
 particular because templates are described in XML files, and can be modified by
 XPaths. Since Odoo is at its heart a modular application, this is an important
 feature for us.
 ```xml
 <div>
  <button t-on-click="increment">Click Me! [<t t-esc="state.value"/>]</button>
 </div>
 ```
 Vue is actually kind of similar. Its template language is kind of close to QWeb,
 with the `v` replaced by the `t`. However, it is also more fully featured. For
 example, Vue templates have slots, or event modifiers. A large difference is that
 most Vue applications will need to be built ahead of time, to compile the templates
 into javascript functions. Note that Vue has a separate build which includes the
 template compiler.
 In contrast, most React applications do not use a templating language, but write
 some JSX code, which is precompiled into plain JavaScript by a build step.
 ```jsx
 class Clock extends React.Component {
  render() {
    return (
      <div>
        <h1>Hello, world!</h1>
        <h2>It is {this.props.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
 }
 ```
 This has the advantage of having the full power of Javascript, but is less
 structured than a template language. Note that the tooling is quite impressive:
 there is a syntax highlighter for jsx here on github!
 ### Asynchronous rendering
 This is actually a big difference between OWL and React/Vue: components in OWL
 are totally asynchronous. They have two asynchronous hooks in their lifecycle:
 - `willStart` (before the widget starts rendering)
 - `willUpdateProps` (before new props are set)
 Both these methods can be implemented and return a promise. The rendering will
 then wait for these promises to be completed before patching the DOM. This is
 useful for some use cases: for example, a widget may want to fetch an external
 library (a calendar widget may need a specialized calendar rendering library),
 in its willStart hook.
 ```javascript
 class MyCalendarWidget extends owl.Component {
    ...
    willStart() {
        return utils.lazyLoad('static/libs/fullcalendar/fullcalendar.js');
    }
    ...
 }
 ```
 This may be dangerous (to stop the rendering waiting for the network), but it is
 extremely powerful as well, as demonstrated by the Odoo Web Client.
 Lazy loading static libraries can obviously be done with React/Vue, but it is
 more convoluted.
 ### 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.
 This is simple, efficient, and a little bit awkward to write.
 Vue is a little bit different: it replace magically the properties in the state
 by getters/setters. With that, it can notify components whenever the state that
 they read was changed.
 Owl is closer to vue: it also tracks magically the state properties, but it does
 only increment a counter whenever it changes (and a _deep_ counter for each of
 its parents). This assumes that the state is actually a tree.
 ### 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 mutations and
 actions, like VueX, it keeps track of the state changes, but it does not notify
 a component when the state changes.  Instead, components need to connect to the
 store like in redux, with a function that will listen to the relevant state.
@@ -1,458 +0,0 @@
 # 🦉 OWL Component 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Composition](#composition)
 - [Reference](#reference)
  - [Properties](#properties)
  - [Methods](#methods)
  - [Lifecycle](#lifecycle)
  - [Semantics](#semantics)
 - [Asynchronous rendering](#asynchronous-rendering)
 ## Overview
 OWL components are the building blocks for user interface. They are designed to be:
 1. **declarative:** the user interface should be described in term of the state
   of the application, not as a sequence of imperative steps.
 2. **composable:** each widget can seamlessly be created in a parent widget by
   a simple directive in its template.
 3. **asynchronous rendering:** the framework will transparently wait for each
   subwidgets to be ready before applying the rendering. It uses native promises
   under the hood.
 4. **uses QWeb as a template system:** the templates are described in XML
   and follow the QWeb specification. This is a requirement for Odoo.
 OWL components are defined as a subclass of Component. The rendering is
 exclusively done by a [QWeb](qweb.md) template (which needs to be preloaded in QWeb).
 Rendering a component generates a virtual dom representation
 of the widget, which is then patched to the DOM, in order to apply the changes in an efficient way.
 OWL components observe their states, and rerender themselves whenever it is
 changed. This is done by an [observer](observer.md).
 ## Example
 Let us have a look at a simple component:
 ```javascript
 class ClickCounter extends owl.Component {
  state = { value: 0 };
  increment() {
    this.state.value++;
  }
 }
 ```
 ```xml
 <button t-name="ClickCounter" t-on-click="increment">
  Click Me! [<t t-esc="state.value"/>]
 </button>
 ```
 Note that this code is written in ESNext style, so it will only run on the
 latest browsers without a transpilation step.
 This example show how a component should be defined: it simply subclasses the
 Component class. If no `template` key is defined, then
 Owl will use the component's name as template name. Here,
 a state object is defined. It is not mandatory to use the state object, but it
 is certainly encouraged. The state object is [observed](observer.md), and any
 change to it will cause a rerendering.
 ## Composition
 The example above shows a QWeb template with a `t-on-click` directive. Widget
 templates are standard [QWeb](qweb.md) templates, but with an extra directive:
 `t-widget`. With the `t-widget` directive, widget templates can declare sub
 widgets:
 ```xml
 <div t-name="ParentWidget">
  <span>some text</span>
  <t t-widget="MyWidget" t-props="{info: 13}"/>
 </div>
 ```
 ```js
 class ParentWidget extends owl.Component {
    widgets = { MyWidget: MyWidget};
    ...
 }
 ```
 In this example, the `ParentWidget`'s template creates a widget `MyWidget` just
 after the span. See the [QWeb](qweb.md) documentation for more information on the
 `t-widget` directive.
 Note that the rendering context for the template is the widget itself. This means
 that the template can access `state`, `props`, `env`, or any methods defined in the widget.
 **CSS and style:** there is some specific support to allow the parent to declare
 additional css classes or style for the sub widget: css declared in `class`, `style`, `t-att-class` or `t-att-style` will be added to the
 root widget element.
 ```xml
 <div t-name="ParentWidget">
  <t t-widget="MyWidget" class="someClass" style="font-weight:bold;" t-props="{info: 13}"/>
 </div>
 ```
 Warning: there is a small caveat with dynamic class attributes: since Owl needs
 to be able to add/remove proper classes whenever necessary, it needs to be aware
 of the possible classes. Otherwise, it will not be able to make the difference
 between a valid css class added by the component, or some custom code, and a
 class that need to be removed. This is why we only support the explicit syntax
 with a class object:
 ```xml
 <t t-widget="MyWidget" t-att-class="{a: state.flagA, b: state.flagB}" />
 ```
 ## Reference
 An Owl component is a small class which represent a widget or some UI element.
 It exists in the context of an environment (`env`), which is propagated from a
 parent to its children. The environment needs to have a QWeb instance, which
 will be used to render the component template.
 Be aware that the name of the component may be significant: if a component does
 not define a `template` key, then Owl will lookup in QWeb to
 find a template with the component name (or one of its ancestor).
 ### Properties
 - **`el`** (HTMLElement | null): reference to the DOM root node of the element. It is `null` when the
  component is not mounted.
 - **`env`** (Object): the component environment, which contains a QWeb instance.
 - **`template`** (string, optional): if given, this is the name of the QWeb template that will render
  the component.
 - **`state`** (Object): this is the location of the component's state, if there is
  any. After the willStart method, the `state` property is observed, and each
  change will cause the widget to rerender itself.
 - **`props`** (Object): this is an object given (in the constructor) by the parent
  to configure the component. It can be dynamically changed later by the parent,
  in some case. Note that `props` are owned by the parent, not by the component.
  As such, it should not ever be modified by the component.
 - **`refs`** (Object): the `refs` object contains all references to sub DOM nodes
  or sub widgets defined by a `t-ref` directive in the component's template.
 ### Methods
 - **`mount(target)`** (async): this is the main way a component's hierarchy is added to the
  DOM: the root component is mounted to a target HTMLElement. 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.
 - **`unmount()`**: in case a component need 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
  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
  are updated. It returns a boolean, which indicates if the widget 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. 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.
 - **`updateEnv(nextEnv)`**: update the environment of a component and all its
  children. This forces a complete rerender. For example, this could be useful
  if we have a `isMobile` key in the environment, to decide if we want a mobile
  interface or a destkop one.
 - **`set(target, key, value)`**. This method is necessary in some cases when we
  need to modify the state of the component in a way that is not visible to the
  observer (see [observer's technical limitations](observer.md#technical-limitations)).
  For example, if we need to add a key to the state.
 - **`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
  framework instead.
 ### Lifecycle
 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                                           |
 | ------------------------------------------------ | ----------------------------------------------------- |
 | **[constructor](#constructor)**                  | constructor                                           |
 | **[willStart](#willStart)**                      | async, before first rendering                         |
 | **[mounted](#mounted)**                          | just after component is rendered and added to the DOM |
 | **[willUpdateProps](#willupdatepropsnextprops)** | async, before props update                            |
 | **[willPatch](#willpatch)**                      | just before the DOM is patched                        |
 | **[patched](#patchedsnapshot)**                  | just after the DOM is patched                         |
 | **[willUnmount](#willUnmount)**                  | just before removing component from DOM               |
 Notes:
 - hooks call order is precisely defined: `[willX]` hooks are called first on parent,
  then on children, and `[Xed]` are called in the reverse order: first children,
  then parent.
 - no hook method should ever be called manually. They are supposed to be
  called by the owl framework whenever it is required.
 #### `constructor(parent, props)`
 The constructor is not exactly a hook, it is the regular,
 normal, constructor of the component. Since it is not a hook, you need to make
 sure that `super` is called.
 This is usually where you would set the initial state and the template of the
 component.
 ```javascript
  constructor(parent, props) {
    super(parent, props);
    this.state = {someValue: true};
    this.template = 'mytemplate';
  }
 ```
 Note that with ESNext class fields, the constructor method does not need to be
 implemented in most cases:
 ```javascript
 class ClickCounter extends owl.Component {
  state = { value: 0 };
  ...
 }
 ```
 #### `willStart()`
 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 widget is rendered. Another use case is to load data from a server.
 ```javascript
  async willStart() {
    await owl.utils.loadJS("my-awesome-lib.js");
  }
 ```
 At this point, the component is not yet rendered. Note that a slow `willStart` method will slow down the rendering of the user
 interface. Therefore, some care should be made to make this method as
 fast as possible.
 The widget rendering will take place after `willStart` is completed.
 #### `mounted()`
 `mounted` is called each time a component is attached to the
 DOM, after the initial rendering and possibly later if the component was unmounted
 and remounted. At this point, the component is considered _active_. 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.
 It is the opposite of `willUnmount`. If a component has been mounted, it will
 always be unmounted at some point in the future.
 The mounted method will be called recursively on each of its children. First,
 the parent, then all its children.
 Note that the state is now observed. It is however allowed (but not encouraged)
 to modify the state in the `mounted` hook. Doing so will cause a rerender,
 which will not be perceptible by the user, but will slightly slow down the
 component.
 #### `willUpdateProps(nextProps)`
 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).
 ```javascript
  willUpdateProps(nextProps) {
    return this.loadData({id: nextProps.id});
  }
 ```
 This hook is not called during the first render (but willStart is called
 and performs a similar job).
 #### `willPatch()`
 The willPatch hook is called just before the DOM patching process starts.
 It is not called on the initial render. This is useful to read some
 information from the DOM. For example, the current position of the
 scrollbar.
 Note that modifying the state object is not allowed here. This method is called just
 before an actual DOM patch, and is only intended to be used to save some local
 DOM state. Also, it will not be called if the widget is not in the DOM (this can
 happen with widgets with `t-keepalive`).
 The return value of this method will be given as the first argument of the
 corresponding `patched` call.
 #### `patched(snapshot)`
 This hook is called whenever a component did actually update its DOM (most
 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 widget is
 not in the DOM (this can happen with widgets with `t-keepalive`).
 The `snapshot` parameter is the result of the previous `willPatch` call.
 Updating the widget 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 patched. So, we need to be particularly
 careful at avoiding endless cycles.
 #### `willUnmount()`
 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.
 ```javascript
  mounted() {
    this.env.bus.on('someevent', this, this.doSomething);
  }
  willUnmount() {
    this.env.bus.off('someevent', this, this.doSomething);
  }
 ```
 This is the opposite method of `mounted`.
 ### Semantics
 We give here an informal description of the way components are created/updated
 in an application. Here, ordered lists describe actions that are executed
 sequentially, bullet lists describe actions that are executed in parallel.
 **Scenario 1: initial rendering** Imagine we want to render the following component tree:
 ```
        A
       / \
      B   C
         / \
        D   E
 ```
 Here is what happen whenever we mount the root
 component (with some code like `app.mount(document.body)`).
 1. `willStart` is called on `A`
 2. when it is done, template `A` is rendered.
   - widget `B` is created
     1. `willStart` is called on `B`
     2. template `B` is rendered
   - widget `C` is created
     1. `willStart` is called on `C`
     2. template `C` is rendered
        - widget `D` is created
          1. `willStart` is called on `D`
          2. template `D` is rendered
        - widget `E` is created
          1. `willStart` is called on `E`
          2. template `E` is rendered
 3. widget `A` is patched into a detached DOM element. This will create the actual
   widget `A` DOM structure. The patching process will cause recursively the
   patching of the `B`, `C`, `D` and `E` DOM trees. (so the actual full DOM tree is created
   in one pass)
 4. the widget `A` root element is actually appended to `document.body`
 5. The method `mounted` is called recursively on all widgets in the following
   order: `B`, `D`, `E`, `C`, `A`.
 **Scenario 2: rerendering a component**. Now, let's assume that the user clicked on some
 button in `C`, and this results in a state update, which is supposed to:
 - update `D`,
 - remove `E`,
 - add new widget `F`.
 So, the component tree should look like this:
 ```
        A
       / \
      B   C
         / \
        D   F
 ```
 Here is what Owl will do:
 1. because of a state change, the method `render` is called on `C`
 2. template `C` is rendered again
   - widget `D` is updated:
     1. hook `willUpdateProps` is called on `D` (async)
     2. template `D` is rerendered
   - widget `F` is created:
     1. hook `willStart` is called on `E` (async)
     2. template `F` is rendered
 3. `willPatch` hooks are called recursively on widgets `C`, `D` (not on `F`,
   because it is not mounted yet)
 4. widget `C` is patched, which will cause recursively:
   2. `willUnmount` hook on `E`, then destruction of `E`,
   3. (initial) patching of `F`, then hook `mounted` is called on `F`
 5. patching of `D`
 6. `patched` hooks are called on `D`, `C`
 ## Asynchronous rendering
 Working with asynchronous code always adds a lot of complexity to a system. Whenever
 different parts of a system are active at the same time, one needs to think
 carefully about all possible interactions. Clearly, this is also true for Owl
 components.
 There are two different common problems with Owl asynchronous rendering model:
 - any widget can delay the rendering (initial and subsequent) of the whole
  application
 - for a given widget, there are two independant situations that will trigger an
  asynchronous rerendering: a change in the state, or a change in the props.
  These changes may be done at different times, and Owl has no way of knowing
  how to reconcile the resulting renderings.
 Here are a few tips on how to work with asynchronous widgets:
 1. minimize the use of asynchronous widgets!
 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`)
@@ -0,0 +1,130 @@
 # 🦉 How to test Components 🦉
 ## Content
 - [Overview](#overview)
 - [Unit Tests](#unit-tests)
 ## Overview
 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.
 ## Unit Tests
 Writing unit tests for Owl components really depends on the testing framework
 used in a project. But usually, it involves the following steps:
 - create a test file: for example `SomeComponent.test.js`,
 - in that file, import the code for `SomeComponent`,
 - add a test case:
  - create a real DOM element to use as test fixture,
  - create a test environment
  - create an instance of `SomeComponent`, mount it to the fixture
  - interact with the component and assert some properties.
 To help with this, it is useful to have a `helper.js` file that contains some
 common utility functions:
 ```js
 export function makeTestFixture() {
  let fixture = document.createElement("div");
  document.body.appendChild(fixture);
  return fixture;
 }
 export function nextTick() {
  let requestAnimationFrame = owl.Component.scheduler.requestAnimationFrame;
  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
    };
 }
 ```
 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, makeTestEnv} from '../helpers';
 //------------------------------------------------------------------------------
 // Setup
 //------------------------------------------------------------------------------
 let fixture: HTMLElement;
 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(() => {
  fixture.remove();
 });
 //------------------------------------------------------------------------------
 // Tests
 //------------------------------------------------------------------------------
 describe("SomeComponent", () => {
  test("component behaves as expected", async () => {
    const props = {...}; // depends on the component
    const comp = await mount(SomeComponent, { target: fixture, props });
    // do some assertions
    expect(...).toBe(...);
    fixture.querySelector('button').click();
    await nextTick();
    // some other assertions
    expect(...).toBe(...);
  });
 });
 ```
 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();
      }
    }
  });
 }
 ```
@@ -0,0 +1,52 @@
 # 🦉 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.
@@ -0,0 +1,133 @@
 # 🦉 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: this.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 page on [event handling](../reference/event_handling.md)
 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.
@@ -0,0 +1,408 @@
 # 🦉 How to start an Owl project 🦉
 ## Content
 - [Overview](#overview)
 - [Simple html file](#simple-html-file)
 - [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/
  index.html
  owl.js
  app.js
 ```
 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). It
 is a single javascript file which export all Owl into the global `owl` object.
 Now, `index.html` should contain the following:
 ```html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <title>Hello Owl</title>
    <script src="owl.js"></script>
    <script src="app.js"></script>
  </head>
  <body></body>
 </html>
 ```
 And `app.js` should look like this:
 ```js
 const { Component, mount } = owl;
 const { xml } = owl.tags;
 const { whenReady } = owl.utils;
 // Owl Components
 class App extends Component {
  static template = xml`<div>Hello Owl</div>`;
 }
 // Setup code
 function setup() {
  mount(App, target: { document.body })
 }
 whenReady(setup);
 ```
 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/
    app.js
    index.html
    main.js
    owl.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).
 Now, `index.html` should contain the following:
 ```html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <title>Hello Owl</title>
    <script src="owl.js"></script>
    <script src="main.js" type="module"></script>
  </head>
  <body></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 `app.js` and `main.js`:
 ```js
 // app.js ----------------------------------------------------------------------
 const { Component, mount } = owl;
 const { xml } = owl.tags;
 export class App extends Component {
  static template = xml`<div>Hello Owl</div>`;
 }
 // main.js ---------------------------------------------------------------------
 import { App } from "./app.js";
 function setup() {
  mount(App, { target: document.body });
 }
 owl.utils.whenReady(setup);
 ```
 The `main.js` file import the `app.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,
 start a static server with the simple `npm run serve` command.
 ## Standard Javascript project
 The previous setup works, and is certainly good for some usecases, including
 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.
 Since it is really not trivial to configure such a project, we provide here an
 example that can be used as a starting point.
 Our standard Owl project has the following file structure:
 ```
 hello_owl/
  public/
    index.html
  src/
    components/
      App.js
    main.js
  tests/
    components/
      App.test.js
    helpers.js
  .gitignore
  package.json
  webpack.config.js
 ```
 This project as a `public` folder, meant to contain all static assets, such as
 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`:
 ```html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <title>Hello Owl</title>
  </head>
  <body></body>
 </html>
 ```
 Note that there are no `<script>` tag here. They will be injected by webpack.
 Now, let's have a look at the javascript files:
 ```js
 // src/components/App.js -------------------------------------------------------
 import { Component, tags, useState } from "@odoo/owl";
 const { xml } = tags;
 export class App extends Component {
  static template = xml`<div t-on-click="update">Hello <t t-esc="state.text"/></div>`;
  state = useState({ text: "Owl" });
  update() {
    this.state.text = this.state.text === "Owl" ? "World" : "Owl";
  }
 }
 // src/main.js -----------------------------------------------------------------
 import { utils, mount } from "@odoo/owl";
 import { App } from "./components/App";
 function setup() {
  mount(App, { target: document.body });
 }
 utils.whenReady(setup);
 // tests/components/App.test.js ------------------------------------------------
 import { App } from "../../src/components/App";
 import { makeTestFixture, nextTick, click } from "../helpers";
 import { mount } from "@odoo/owl";
 let fixture;
 beforeEach(() => {
  fixture = makeTestFixture();
 });
 afterEach(() => {
  fixture.remove();
 });
 describe("App", () => {
  test("Works as expected...", async () => {
    await mount(App, { target: 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() {
  return new Promise(function (resolve) {
    setTimeout(() => Component.scheduler.requestAnimationFrame(() => resolve()));
  });
 }
 export function makeTestFixture() {
  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
 ```
@@ -0,0 +1,256 @@
 # Comparison with Vue/React
 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
 discussed, feel free to open an issue/submit a PR to correct this text.
 ## Content
 - [Size](#size)
 - [Class Based](#class-based)
 - [Tooling/Build Step](#toolingbuild-step)
 - [Templating](#templating)
 - [Asynchronous rendering](#asynchronous-rendering)
 - [Reactiveness](#reactiveness)
 - [State Management](#state-management)
 - [Hooks](#hooks)
 ## Size
 OWL is intended to be small and to work at a slightly lower level of abstraction
 than React and Vue. Also, jQuery is not the same kind of framework, but it is interesting to compare.
 | Framework                | Size (minified, gzipped) |
 | ------------------------ | ------------------------ |
 | OWL                      | 18kb                     |
 | Vue + VueX               | 30kb                     |
 | Vue + VueX + Vue Router  | 39kb                     |
 | React + ReactDOM + Redux | 40kb                     |
 | jQuery                   | 30kb                     |
 Note that those comparisons are not entirely fair, because we do not compare
 the same exact set of features. For example, VueX and Vue Router support more
 advanced use cases.
 ## Class Based
 Both React and Vue moved away from defining components with classes. They prefer
 a more functional approach, in particular, with the new `hooks` mechanisms.
 This has some advantages and disadvantages. But the end result is that React
 and Vue both offers multiple different ways of defining new components. In
 contrast, Owl has only one mechanism: class-based components. We believe that Owl
 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,
 both of these are important mechanisms for reusing code. Also, one does not
 exclude the other.
 It certainly looks like the world of UI frameworks is moving toward composition,
 for many very good reasons. Owl is still good at composition (for example,
 Owl supports slots, which is the primary mechanism to make generic reusable
 components). But it can also use inheritance (and this is very important since
 templates can also be inherited with `xpaths` transformations).
 ## Tooling/Build step
 OWL is designed to be easy to use in a standalone way. For various reasons,
 Odoo does not want to rely on standard web tools (such as webpack), and OWL can
 be used by simply adding a script tag to a page.
 ```html
 <script src="owl.min.js" />
 ```
 In comparison, React encourages using JSX, which necessitate a build step, and
 most Vue applications uses single file components, which also necessitate a build step.
 On the flipside, external tooling may make it harder to use in some case, but it
 also brings a lot of benefits. And React/Vue have both a large ecosystem.
 Note that since Owl is not dependant on any external tool nor libraries, it is
 very easy to integrate into any build toolchain. Also, since we cannot rely on
 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
 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.
 ## Templating
 OWL uses its own QWeb engine, which compiles templates on the
 frontend, as they are needed. This is extremely convenient for our use case, in
 particular because templates are described in XML files, and can be modified by
 XPaths. Since Odoo is at its heart a modular application, this is an important
 feature for us.
 ```xml
 <div>
  <button t-on-click="increment">Click Me! [<t t-esc="state.value"/>]</button>
 </div>
 ```
 Vue is actually kind of similar. Its template language is kind of close to QWeb,
 with the `v` replaced by the `t`. However, it is also more fully featured. For
 example, Vue templates have slots, or event modifiers. A large difference is that
 most Vue applications will need to be built ahead of time, to compile the templates
 into javascript functions. Note that Vue has a separate build which includes the
 template compiler.
 In contrast, most React applications do not use a templating language, but write
 some JSX code, which is precompiled into plain JavaScript by a build step. This
 example is done with the (kind of outdated) React class system:
 ```jsx
 class Clock extends React.Component {
  render() {
    return (
      <div>
        <h1>Hello, world!</h1>
        <h2>It is {this.props.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
 }
 ```
 This has the advantage of having the full power of Javascript, but is less
 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:
 ```js
 class Clock extends Component {
  static template = xml`
      <div>
        <h1>Hello, world!</h1>
        <h2>It is {props.date.toLocaleTimeString()}.</h2>
      </div>
    `;
 }
 ```
 ## Asynchronous Rendering
 This is actually a big difference between OWL and React/Vue: components in OWL
 are totally asynchronous. They have two asynchronous hooks in their lifecycle:
 - `willStart` (before the component starts rendering)
 - `willUpdateProps` (before new props are set)
 Both these methods can be implemented and return a promise. The rendering will
 then wait for these promises to be completed before patching the DOM. This is
 useful for some use cases: for example, a component may want to fetch an external
 library (a calendar component may need a specialized calendar rendering library),
 in its willStart hook.
 ```javascript
 class MyCalendarComponent extends owl.Component {
    ...
    willStart() {
        return utils.lazyLoad('static/libs/fullcalendar/fullcalendar.js');
    }
    ...
 }
 ```
 This may be dangerous (to stop the rendering waiting for the network), but it is
 extremely powerful as well, as demonstrated by the Odoo Web Client.
 Lazy loading static libraries can obviously be done with React/Vue, but it is
 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)).
 ## 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.
 This is simple, efficient, and a little bit awkward to write.
 Vue is a little bit different: it replace magically the properties in the state
 by getters/setters. With that, it can notify components whenever the state that
 they read was changed.
 Owl is closer to vue: it also tracks magically the state properties, but it does
 only increment an internal counter whenever it changes. Note that it is done
 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).
 ## Hooks
 [Hooks](https://reactjs.org/docs/hooks-intro.html#motivation) recently took over
 the React world. They solve a lot of seemingly unconnected problems: attach
 reusable behavior to a component, in a composable way, extract stateful logic
 from a component or reuse stateful logic between component, without changing your
 component hierarchy.
 Here is an example of the React `useState` hook:
 ```js
 import React, { useState } from "react";
 function Example() {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>Click me</button>
    </div>
  );
 }
 ```
 Because of the way React designed the hooks API, they only work for functional
 components. But in that case, they really are powerful. Every major React library
 is in the process of redesigning their API with hooks (for example,
 [Redux](https://react-redux.js.org/next/api/hooks)).
 Vue 2 does not have hooks, but the Vue project is working on its next version,
 which will feature its new [composition API](https://vue-composition-api-rfc.netlify.com/).
 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,
 the `useState` hook is named after React, but its API is closer to the `reactive`
 Vue hook.
 Here is what the `Counter` example above look like in Owl:
 ```js
 import { Component, Owl } from "owl";
 import { xml } from "owl/tags";
 class Example extends Component {
  static template = xml`
      <div>
        <p>You clicked {count.value} times</p>
        <button t-on-click="increment">Click me</button>
      </div>`;
  count = useState({ value: 0 });
  increment() {
    this.state.value++;
  }
 }
 ```
 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.
@@ -0,0 +1,32 @@
 # 🦉 Rendering Pipeline 🦉
 We explain here how Owl is designed, from the perspective of its rendering
 pipeline.
 Warning: these notes are technical by nature, and intended for people working
 on Owl (or interested in understanding its design).
 ## Overview
 A rendering occurs in two phases:
 - virtual rendering: this generates the virtual dom in memory, asynchronously
 - patch: applies a virtual tree to the screen (synchronously)
 There are several classes involved in a rendering:
 - components
 - a scheduler
 - fibers: small objects containing some metadata, associated with a rendering of
  a specific component
 Components are organized in a dynamic component tree, visible in the user
 interface. Whenever a rendering is initiated in a component `C`:
 - a fiber is created on `C` with the rendering props information
 - the virtual rendering phase starts on C (will asynchronously render all the
  child components)
 - the fiber is added to the scheduler, which will poll continuously, every
  animation frame, if the fiber is done
 - once it is done, the scheduler will call the task callback, which will apply
  the patch (if it was not cancelled in the meantime).
@@ -0,0 +1,18 @@
 # 🦉 VDom 🦉
 Owl is a declarative component system: we declare the structure of the component
 tree, and Owl will translate that to a list of imperative operations. This
 translation is done by a virtual dom. This is the low level layer of Owl, most
 developer will not need to call directly the virtual dom functions.
 The main idea behind a virtual dom is to keep a in-memory representation of the
 DOM (called a virtual node), and whenever some change is needed, to regenerate
 a new representation, compute the difference between the old and the new, then
 apply the changes.
 `vdom` exports two functions:
 - `h`: create a new virtual node
 - `patch`: compare two virtual nodes, and apply the difference.
 Note: Owl's virtual dom is a fork of [snabbdom](https://github.com/snabbdom/snabbdom).
@@ -0,0 +1,180 @@
 # 🦉 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 🦉.
@@ -1,54 +0,0 @@
 # 🦉 Observer 🦉
 Owl need to be able to react to state changes. For example, whenever the state
 of a component is changed, we need to rerender it. To help with that, we have
 an Observer class. Its job is to observe some object state, and react to any
 change. To do that, it recursively replace all keys of the observed state by
 getters and setters.
 For example, this code will display `update` in the console:
 ```javascript
 const observer = new owl.Observer();
 observer.notifyCB = () => console.log("update");
 observer.observe(obj);
 const obj = { a: { b: 1 } };
 obj.a.b = 2;
 ```
 ## Technical Limitations
 Since the observer uses getters and setters, it is actually unable to react to
 changes in two situations:
 - adding a key to an object:
  ```javascript
  const observer = new owl.Observer();
  const obj = { a: 1 };
  observer.observe(obj);
  obj.b = 2; // will do nothing
  ```
  In that case, we need a way to tell the observer that something happened.
  This can be done by using the `set` method:
  ```javascript
  observer.set(obj, "b", 2);
  ```
 - modifying an array by setting a new value at a given index:
  ```javascript
  const observer = new owl.Observer();
  const obj = { todos: [{ id: 1, text: "todo" }] };
  observer.observe(obj);
  obj[0] = { id: 2, text: "othertodo" }; // will do nothing, and obj[0] is not observed
  ```
  In that case, the solution is the same, we can simply use the `set` method:
  ```javascript
  observer.set(obj, 0, { id: 2, text: "othertodo" });
  ```
@@ -1,101 +0,0 @@
 # 🦉 Quick Start 🦉
 ## Static server
 Let us assume that we have a static server running somewhere. We could then
 simply add an html page with a few extra files.
 ### HTML and CSS
 In a file `index.html`:
 ```html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>My OWL App</title>
    <link href="app.css" rel="stylesheet" />
    <script src="owl-X.Y.Z.js"></script>
  </head>
  <body>
    <div id="main"></div>
    <script src="app.js" type="module"></script>
  </body>
 </html>
 ```
 In `app.css`:
 ```css
 button {
  color: darkred;
  font-size: 30px;
  width: 220px;
 }
 ```
 Also, let's not forget to add a release of OWL (`owl-X.Y.Z.js`)
 ### XML
 In `templates.xml`:
 ```xml
 <templates>
   <button t-name="clickcounter" t-on-click="increment">
      Click Me! [<t t-esc="state.value"/>]
    </button>
 </templates>
 ```
 ### JS
 To build an application (or a sub-part of an application), we need two things:
 - an environment: it is the global context in which we are working. It needs to
  contain a QWeb instance (preloaded with templates), and anything else that we
  need. In practice, it could context some user session information, some
  configuration keys (for example, isMobile = true/false if we are in mobile mode).
 - a description of the user interface: there should be a root widget, which can
  have sub widgets
 Here are a few steps that we may take to get started:
 - get the templates
 - create a qweb engine, with the templates
 - create an environment
 - create an instance of the root widget
 - mount the root widget to a DOM element
 Let us now add the javascript to make it work, in `app.js`:
 ```javascript
 class ClickCounter extends owl.Component {
  constructor() {
    super(...arguments);
    this.template = "clickcounter";
    this.state = { value: 0 };
  }
  increment() {
    this.state.value++;
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 async function start() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const env = {
    qweb: new owl.QWeb(templates)
  };
  const counter = new ClickCounter(env);
  const target = document.getElementById("main");
  await counter.mount(target);
 }
 start();
 ```
@@ -1,594 +0,0 @@
 # 🦉 QWeb 🦉
 ## Content
 - [Overview](#overview)
 - [QWeb Engine](#qweb-engine)
 - [QWeb Specification](#qweb-specification)
  - [Static html nodes](#static-html-nodes)
  - [`t-esc` directive](#t-esc-directive)
  - [`t-raw` directive](#t-raw-directive)
  - [`t-set` directive](#t-set-directive)
  - [`t-if` directive](#t-if-directive)
  - [Expression evaluation](#expression-evaluation)
  - [Dynamic attributes (`t-att` and `t-attf` directives)](#dynamic-attributes-t-att-and-t-attf-directives)
  - [`t-attf` directive (dynamic attributes)](#t-att-directive-dynamic-attributes)
  - [`t-call` directive (sub templates)](#t-call-directive-sub-templates)
 - [JS/OWL Specific Extensions](#jsowl-specific-extensions)
  - [`t-on` directive](#t-on-directive)
  - [Component: `t-widget`, `t-props`](#component-t-widget-t-props)
  - [`t-ref` directive](#t-ref-directive)
  - [`t-key` directive](#t-key-directive)
  - [`t-transition` directive](#t-transition-directive)
  - [`t-mounted` directive](#t-mounted-directive)
  - [Debugging (`t-debug` and `t-log`)](#debugging-t-debug-and-t-log)
  - [White spaces](#white-spaces)
  - [Root nodes](#root-nodes)
 ## Overview
 [QWeb](https://www.odoo.com/documentation/12.0/reference/qweb.html) is the primary templating engine used by Odoo. It is based on the XML format, and used
 mostly to generate html. In OWL, QWeb templates are compiled into functions that
 generate a virtual dom representation of the html.
 Template directives are specified as XML attributes prefixed with `t-`, for instance `t-if` for conditionals, with elements and other attributes being rendered directly.
 To avoid element rendering, a placeholder element `<t>` is also available, which executes its directive but doesn’t generate any output in and of itself.
 The QWeb implementation in the OWL project is slightly different. It compiles
 templates into functions that output a virtual DOM instead of a string. This is
 necessary for the component system. In addition, it has a few extra directives
 (see [OWL Specific Extensions](#owlspecificextensions))
 ## QWeb Engine
 This section is about the javascript code that implements the `QWeb` specification.
 Owl exports a `QWeb` class in `owl.QWeb`. To use it, it just needs to be
 instantiated:
 ```js
 const qweb = new owl.QWeb();
 ```
 It's API is quite simple:
 - **`constructor(data)`**: constructor. Takes an optional string to add initial
  templates (see `addTemplates` for more information on format of the string).
  ```js
  const qweb = new owl.QWeb(TEMPLATES);
  ```
 - **`addTemplate(name, xmlStr)`**: add a specific template.
  ```js
  qweb.addTemplate("mytemplate", "<div>hello</div>");
  ```
 - **`addTemplates(xmlStr)`**: add a list of templates (identified by `t-name`
  attribute).
  ```js
  const TEMPLATES = `
    <templates>
      <div t-name="App" class="main">main</div>
      <div t-name="OtherWidget">other widget</div>
    </templates>`;
  qweb.addTemplates(TEMPLATES);
  ```
 - **`render(name, context, extra)`**: renders a template. This returns a `vnode`,
  which is a virtual representation of the DOM (see [vdom doc](vdom.md)).
  ```js
  const vnode = qweb.render("App", widget);
  ```
 ## QWeb Specification
 We define in this section the specification of how `QWeb` templates should be
 rendered.
 ### Static html nodes
 Normal, regular html nodes are rendered into themselves:
 ```xml
  <div>hello</div> <!–– rendered as itself ––>
 ```
 ### `t-esc` directive
 The `t-esc` directive is necessary whenever you want to add a dynamic text
 expression in a template. The text is escaped to avoid security issues.
 ```xml
 <p><t t-esc="value"/></p>
 ```
 rendered with the value `value` set to `42` in the rendering context yields:
 ```html
 <p>42</p>
 ```
 ### `t-raw` directive
 The `t-raw` directive is almost the same as `t-esc`, but without the escaping.
 This is mostly useful to inject a raw html string somewhere. Obviously, this
 is unsafe to do in general, and should only be used for strings known to be safe.
 ```xml
 <p><t t-esc="value"/></p>
 ```
 rendered with the value `value` set to `<span>foo</span>` in the rendering context yields:
 ```html
 <p><span>foo</span></p>
 ```
 ### `t-set` directive
 QWeb allows creating variables from within the template, to memoize a computation (to use it multiple times), give a piece of data a clearer name, ...
 This is done via the `t-set` directive, which takes the name of the variable to create. The value to set can be provided in two ways:
 1. a `t-value` attribute containing an expression, and the result of its
   evaluation will be set:
   ```xml
   <t t-set="foo" t-value="2 + 1"/>
   <t t-esc="foo"/>
   ```
   will print `3`. Note that the evaluation is done at rendering time, not at
   compilte time.
 2. if there is no `t-value` attribute, the node’s body is saved and its value is
   set as the variable’s value:
   ```xml
   <t t-set="foo">
       <li>ok</li>
   </t>
   <t t-esc="foo"/>
   ```
   will generate `&lt;li&gt;ok&lt;/li&gt;` (the content is escaped as we used the `t-esc` directive)
 The `t-set` directive acts like a regular variable in most programming language.
 It is lexically scoped (inner nodes are sub scopes), can be shadowed, ...
 ### `t-if` directive
 The `t-if` directive is useful to conditionally render something. It evaluates
 the expression given as attribute value, and then acts accordingly.
 ```xml
 <div>
    <t t-if="condition">
        <p>ok</p>
    </t>
 </div>
 ```
 The element is rendered if the condition (evaluated with the current rendering
 context) is true:
 ```xml
 <div>
    <p>ok</p>
 </div>
 ```
 but if the condition is false it is removed from the result:
 ```xml
 <div>
 </div>
 ```
 The conditional rendering applies to the bearer of the directive, which does not
 have to be `<t>`:
 ```xml
 <div>
    <p t-if="condition">ok</p>
 </div>
 ```
 will give the same results as the previous example.
 Extra conditional branching directives `t-elif` and `t-else` are also available:
 ```xml
 <div>
    <p t-if="user.birthday == today()">Happy bithday!</p>
    <p t-elif="user.login == 'root'">Welcome master!</p>
    <p t-else="">Welcome!</p>
 </div>
 ```
 ### Expression evaluation
 It is useful to explain the various rules that applies on QWeb expressions. These
 expressions are strings that will be converted to a javascript expression at
 compile time.
 1. it should be a simple expression which returns a value. It cannot be a statement.
   ```xml
   <div><p t-if="1 + 2 === 3">ok</p></div>
   ```
   is valid, but the following is not valid:
   ```xml
   <div><p t-if="console.log(1)">NOT valid</p></div>
   ```
 2. it can use anything in the rendering context:
   ```xml
   <p t-if="user.birthday == today()">Happy bithday!</p>
   ```
   is valid, and will read the `user` object from the context, and call the
   `today` function.
 3. it can use a few special operators to avoid using symbols such as `<`, `>`,
   `&` or `|`. This is useful to make sure that we still write valid XML.
   | Word  | will be replaced by |
   | ----- | ------------------- |
   | `and` | `&&`                |
   | `or`  | `\|\|`              |
   | `gt`  | `>`                 |
   | `gte` | `>=`                |
   | `lt`  | `<`                 |
   | `lte` | `<=`                |
   So, one can write this:
   ```xml
   <div><p t-if="10 + 2 gt 5">ok</p></div>
   ```
 ### Dynamic attributes (`t-att` and `t-attf` directives)
 One can use the `t-att-` directive to add dynamic attributes. Its main use is to
 evaluate an expression (at rendering time) and bind an attribute to its result:
 For example, if we have `id` set to 32 in the rendering context,
 ```xml
 <div t-att-data-action-id="id"/> <!-- result: <div data-action-id="32"></div> -->
 ```
 If an expression evaluates to a falsy value, it will not be set at all:
 ```xml
 <div t-att-foo="false"/>  <!-- result: <div></div> -->
 ```
 There is another way to format a string attribute: the `t-attf-` directive. With
 it, you get string interpolation:
 ```xml
 <div t-attf-foo="a {{value1}} is {{value2}} of {{value3}} ]"/>
 <!-- result if values are set to 1,2 and 3: <div foo="a 0 is 1 of 2 ]"></div> -->
 ```
 For historical reason, there is an alternate form of string interpolation:
 ```xml
 <div t-attf-foo="a #{value1} is #{value2} of #{value3} ]"/>
 <!-- result if values are set to 1,2 and 3: <div foo="a 0 is 1 of 2 ]"></div> -->
 ```
 ### `t-call` directive (sub templates)
 QWeb templates can be used for top level rendering, but they can also be used
 from within another template (to avoid duplication or give names to parts of
 templates), using the `t-call` directive:
 ```xml
 <div t-name="other-template">
    <p><t t-value="var"/></p>
 </div>
 <div t-name="main-template">
    <t t-set="var" t-value="owl"/>
    <t t-call="other-template"/>
 </div>
 ```
 will be rendered as `<div><p>owl</p></div>`. This example shows that the sub
 template is rendered with the execution context of the parent. The sub template
 is actually inlined in the main template, but in a sub scope: variables defined
 in the sub template do not escape.
 Sometimes, one might want to pass information to the sub template. In that case,
 the content of the body of the `t-call` directive is available as a special
 magic variable `0`:
 ```xml
 <t t-name="other-template">
    This template was called with content:
    <t t-raw="0"/>
 </t>
 <div t-name="main-template">
    <t t-call="other-template">
        <em>content</em>
    </t>
 </div>
 ```
 will result in :
 ```xml
 <div>
    This template was called with content:
    <em>content</em>
 </div>
 ```
 ## JS/OWL Specific Extensions
 ### `t-on` directive
 In a component's template, it is useful to be able to register handlers on some
 elements to some specific events. This
 is what makes a template _alive_. There are two different use cases.
 1. Register an event handler on a DOM node
   ```xml
   <button t-on-click="someMethod">Do something</button>
   ```
   This will be roughly translated in javascript like this:
   ```js
   button.addEventListener("click", widget.someMethod.bind(widget));
   ```
   The suffix (`click` in this example) is simply the name of the actual DOM
   event.
 2. Register an event handler on a component. This will not capture a DOM event,
   but rather a _business_ event:
   ```xml
   <t t-widget="MyWidget" t-on-menuLoaded="someMethod"/>
   ```
   ```js
   class MyWidget {
       someWhere() {
           const payload = ...;
           this.trigger('menuLoaded', payload);
       }
   }
   ```
   Here, the parent widget will receive the payload in its `someMethod` handler,
   whenever the event is triggered.
 The `t-on` directive also allows to prebind some 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.
 ### Component: `t-widget`, `t-props`
 The `t-widget` and the `t-props` directives are the key to a declarative component
 system. They allow a template to define where and how a sub widget is created
 and/or updated. For example:
 ```xml
 <div t-name="ParentWidget">
    <t t-widget="ChildWidget" t-props="{count: state.val}"/>
 </div>
 ```
 ```js
 class ParentWidget {
  widgets = { ChildWidget };
  state = { val: 4 };
 }
 ```
 Whenever the template is rendered, it will automatically create the subwidget
 `ChildWidget` at the correct place. It needs to find the reference to the
 actual component class in the special `widgets` key.
 In this example, the child widget will receive the object `{count: 4}` in its
 constructor. This will be assigned to the `props` variable, which can be accessed
 on the widget (and also, in the template). Whenever the state is updated, then
 the subwidget will also be updated automatically.
 ### `t-ref` directive
 The `t-ref` directive helps a component keep reference to some inside part of it.
 Like the `t-on` directive, it can work either on a DOM node, or on a component:
 ```xml
 <div>
    <div t-ref="someDiv"/>
    <t t-widget="SubWidget" t-ref="someWidget"/>
 </div>
 ```
 In this example, the widget will be able to access the `div` and the component
 inside the special `refs` variable:
 ```js
 this.refs.someDiv;
 this.refs.someWidget;
 ```
 This is useful for various usecases: for example, integrating with an external
 library that needs to render itself inside an actual DOM node. Or for calling
 some method on a sub widget.
 Note: if used on a component, the reference will be set in the `refs`
 variable between `willPatch` and `patched`.
 ### `t-key` directive
 Even though Owl tries to be as declarative as possible, some DOM state is still
 locked inside the DOM: for example, the scrolling state, the current user selection,
 the focused element or the state of an input. This is why we use a virtual dom
 algorithm to keep the actual DOM node as much as possible. However, this is
 sometimes not enough, and we need to help Owl decide if an element is actually
 the same, or is different. The `t-key` directive is used to give an identity to an element.
 There are three main use cases:
 - _elements in a list_:
  ```xml
    <span t-foreach="todos" t-as="todo" t-key="todo.id">
        <t t-esc="todo.text"/>
    </span>
  ```
 - _`t-if`/`t-else`_
 - _animations_: give a different identity to a component. Ex: thread id with
  animations on add/remove message.
 ### `t-transition` directive
 To perform useful transition effects, whenever an element appears or disappears,
 it is necessary to add/remove some css style or class at some precise moment in
 the lifetime of a node. Since this is not easy to do by hand, Owl `t-transition`
 directive is there to help.
 Whenever a node has a `t-transition` directive, with a `name` value, the following
 will happen:
 At node creation:
 - the css classes `name-enter` and `name-enter-active` will be added before the
  node is added to 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),
 - 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,
 - the css class `name-leave` will be removed on the next animation frame (so it
  can be used to trigger css transition effects),
 - the css class `name-leave-active` will be removed whenever a css transition
  ends. Only then will the element be removed from the DOM.
 For example, a simple fade in/out effect can be done with this:
 ```xml
 <div>
    <div t-if="state.flag" class="square" t-transition="fade">Hello</div>
 </div>
 ```
 ```css
 .fade-enter-active,
 .fade-leave-active {
  transition: opacity 0.5s;
 }
 .fade-enter,
 .fade-leave-to {
  opacity: 0;
 }
 ```
 Note: more information on animations are available [here](doc/animations.md).
 ### `t-mounted` directive
 The `t-mounted` directive allows to register a callback to execute whenever the node
 is inserted into the DOM.
 ```xml
 <div><input t-ref="someInput" t-mounted="focusMe"/></div>
 ```
 ```js
 class MyWidget extends owl.Component {
    ...
    focusMe() {
        this.refs.someInput.focus();
    }
 }
 ```
 ### Debugging (`t-debug` and `t-log`)
 The javascript QWeb implementation provides two useful debugging directives:
 `t-debug` adds a debugger statement during template rendering:
 ```xml
 <t t-if="a_test">
    <t t-debug="">
 </t>
 ```
 will stop execution if the browser dev tools are open.
 `t-log` takes an expression parameter, evaluates the expression during rendering and logs its result with console.log:
 ```xml
 <t t-set="foo" t-value="42"/>
 <t t-log="foo"/>
 ```
 will print 42 to the console
 ### White spaces
 White spaces in a templates are handled in a special way:
 - consecutive whitespaces are always condensed to a single whitespace
 - if a whitespace-only text node contains a linebreak, it is ignored
 - the previous rules do not apply if we are in a `<pre>` tag
 ### Root nodes
 For many reasons, Owl QWeb templates should have a single root node. More
 precisely, the result of a template rendering should have a single root node:
 ```xml
 <!–– not ok: two root nodes ––>
 <t>
    <div>foo</div>
    <div>bar</div>
 </t>
 <!–– ok: result has one single root node ––>
 <t>
    <div t-if="someCondition">foo</div>
    <span t-else="1">bar</span>
 </t>
 ```
 Extra root nodes will actually be ignored (even though they will be rendered
 in memory).
 Note: this does not apply to subtemplates (see the `t-call` directive). In that
 case, they will be inlined in the main template, and can actually have many
 root nodes.
@@ -1,16 +1,54 @@
 # 🦉 OWL Documentation 🦉
 ## Learning Owl
 Are you new to Owl? This is the place to start!
 - [Tutorial: create a TodoList application](learning/tutorial_todoapp.md)
 - [Quick Overview](learning/overview.md)
 - [How to start an Owl project](learning/quick_start.md)
 - [How to test Components](learning/how_to_test.md)
 - [How to write Single File Components](learning/how_to_write_sfc.md)
 ## Reference
- [Component](component.md)
+You will find here a complete reference of every feature, class or object
- [QWeb](qweb.md)
+provided by Owl.
 - [Store](store.md)
 - [Observer](observer.md)
 - [Virtual DOM](vdom.md)
 - [Utils](utils.md)
-## Miscellaneous
+- [Animations](reference/animations.md)
- [Quick Start](quick_start.md)
+- [Browser](reference/browser.md)
- [Animations](animations.md)
+- [Component](reference/component.md)
- [Comparison with React/Vue](comparison.md)
+- [Content](reference/content.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)
 - [Event Handling](reference/event_handling.md)
 - [Error Handling](reference/error_handling.md)
 - [Hooks](reference/hooks.md)
 - [Mounting a component](reference/mounting.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)
 - [Slots](reference/slots.md)
 - [Tags](reference/tags.md)
 - [Utils](reference/utils.md)
 ## Other Topics
 This section provides miscellaneous document that explains some topics
 which cannot be considered either a tutorial, or reference documentation.
 - [Owl architecture: the Virtual DOM](miscellaneous/vdom.md)
 - [Owl architecture: the rendering pipeline](miscellaneous/rendering.md)
 - [Comparison with React/Vue](miscellaneous/comparison.md)
 - [Why did Odoo built Owl?](miscellaneous/why_owl.md)
 ---
 Found an issue in the documentation? A broken link? Some outdated information?
 Please open an issue or submit a PR!
@@ -0,0 +1,127 @@
 # 🦉 Animations 🦉
 Animation is a complex topic. There are many different use cases, and many
 solutions and technologies. Owl only supports some basic use cases.
 ## Simple CSS effects
 Sometimes, using pure CSS is enough. For these use cases, Owl is not really
 necessary: it just needs to render a DOM element with a specific class. For
 example:
 ```xml
 <a class="btn flash" t-on-click="doSomething">Click</a>
 ```
 with the following CSS:
 ```css
 btn {
  background-color: gray;
 }
 .flash {
  transition: background 0.5s;
 }
 .flash:active {
  background-color: #41454a;
  transition: background 0s;
 }
 ```
 will produce a nice flash effect whenever the user clicks (or activates with the
 keyboard) the button.
 ## CSS Transitions
 A more complex situation occurs when we want to transition an element in or out
 of the page. For example, we may want a fade-in and fade-out effect.
 The `t-transition` directive is here to help us. It works on html elements and
 on components, by adding and removing some css classes.
 To perform useful transition effects, whenever an element appears or disappears,
 it is necessary to add/remove some css style or class at some precise moment in
 the lifetime of a node. Since this is not easy to do by hand, Owl `t-transition`
 directive is there to help.
 Whenever a node has a `t-transition` directive, with a `name` value, the following
 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.
 - 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).
 - at the end of the transition, `name-enter-to` and `name-enter-active` will be removed.
 At node destruction:
 - the css classes `name-leave` and `name-leave-active` will be added before the
  node is removed to the DOM.
 - on the next animation frame: the css class `name-leave` will be removed and the
  class `name-leave-to` will be added (so they can be used to trigger css
  transition effects).
 - at the end of the transition, `name-leave-to` and `name-leave-active` will be removed.
 For example, a simple fade in/out effect can be done with this:
 ```xml
 <div>
    <div t-if="state.flag" class="square" t-transition="fade">Hello</div>
 </div>
 ```
 ```css
 .fade-enter-active,
 .fade-leave-active {
  transition: opacity 0.5s;
 }
 .fade-enter,
 .fade-leave-to {
  opacity: 0;
 }
 ```
 The `t-transition` directive can be applied on a node element or on a component.
 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"/>
 ```
@@ -0,0 +1,33 @@
 # 🦉 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`
@@ -0,0 +1,855 @@
 # 🦉 OWL Component 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
  - [Reactive System](#reactive-system)
  - [Properties](#properties)
  - [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)
  - [Form Input Bindings](#form-input-bindings)
  - [References](#references)
  - [Dynamic sub components](#dynamic-sub-components)
  - [Functional Components](#functional-components)
  - [SVG Components](#svg-components)
 ## Overview
 OWL components are the building blocks for user interface. They are designed to be:
 1. **declarative:** the user interface should be described in terms of the state
   of the application, not as a sequence of imperative steps.
 2. **composable:** each component can seamlessly be created in a parent component by
   a simple tag or directive in its template.
 3. **asynchronous rendering:** the framework will transparently wait for each
   sub components to be ready before applying the rendering. It uses native promises
   under the hood.
 4. **uses QWeb as a template system:** the templates are described in XML
   and follow the QWeb specification. This is a requirement for Odoo.
 OWL components are defined as a subclass of Component. The rendering is
 exclusively done by a [QWeb](qweb_templating_language.md) template (which needs to be preloaded in QWeb).
 Rendering a component generates a virtual dom representation
 of the component, which is then patched to the DOM, in order to apply the changes in an efficient way.
 ## Example
 Let us have a look at a simple component:
 ```javascript
 const { useState } = owl.hooks;
 class ClickCounter extends owl.Component {
  state = useState({ value: 0 });
  increment() {
    this.state.value++;
  }
 }
 ```
 ```xml
 <button t-name="ClickCounter" t-on-click="increment">
  Click Me! [<t t-esc="state.value"/>]
 </button>
 ```
 Note that this code is written in ESNext style, so it will only run on the
 latest browsers without a transpilation step.
 This example shows how a component should be defined: it simply subclasses the
 Component class. If no static `template` key is defined, then
 Owl will use the component's name as template name. Here,
 a state object is defined, by using the `useState` hook. It is not mandatory to use the state object, but it is certainly encouraged. The result of the `useState` call is
 [observed](observer.md), and any change to it will cause a rerendering.
 ## Reference
 An Owl component is a small class which represents a component or some UI element.
 It exists in the context of an [environment](environment.md) (`env`), which is propagated from a
 parent to its children. The environment needs to have a [QWeb](qweb_templating_language.md) instance, which
 will be used to render the component template.
 Be aware that the name of the component may be significant: if a component does
 not define a `template` key, then Owl will lookup in QWeb to
 find a template with the component name (or one of its ancestors).
 ### Reactive system
 OWL components are normal javascript classes. So, changing a component internal
 state does nothing more:
 ```js
 class Counter extends Component {
  static template = xml`<div t-on-click="increment"><t t-esc="state.value"/></div>`;
  state = { value: 0 };
  increment() {
    this.state.value++;
  }
 }
 ```
 Clicking on the `Counter` component defined above will call the `increment`
 method, but it will not rerender the component. To fix that, one could add an
 explicit call to `render` in `increment`:
 ```js
    increment() {
        this.state.value++;
        this.render();
    }
 ```
 However, it may be simple in this case, but it quickly become cumbersome, as a
 component get more complex, and its internal state is modified by more than one
 method.
 A better way is to use the reactive system: by using the `useState` hook (see the
 [hooks](hooks.md) section for more details), one can make Owl react to state
 changes. The `useState` hook generates a proxy version of an object
 (this is done by an [observer](observer.md)), which allows the component to
 react to any change. So, the `Counter` example above can be improved like this:
 ```js
 const { useState } = owl.hooks;
 class Counter extends Component {
  static template = xml`<div t-on-click="increment"><t t-esc="state.value"/></div>`;
  state = useState({ value: 0 });
  increment() {
    this.state.value++;
  }
 }
 ```
 Obviously, we can call the `useState` hook more than once:
 ```js
 const { useState } = owl.hooks;
 class Counter extends Component {
  static template = xml`
      <div>
        <span t-on-click="increment(counter1)"><t t-esc="counter1.value"/></span>
        <span t-on-click="increment(counter2)"><t t-esc="counter2.value"/></span>
      </div>`;
  counter1 = useState({ value: 0 });
  counter2 = useState({ value: 0 });
  increment(counter) {
    counter.value++;
  }
 }
 ```
 Note that hooks are subject to one important [rule](hooks.md#one-rule): they need
 to be called in the constructor.
 ### Properties
 - **`el`** (HTMLElement | null): reference to the DOM root node of the element. It is `null` when the
  component is not mounted.
 - **`env`** (Object): the component [environment](environment.md), which contains a QWeb instance.
 - **`props`** (Object): this is an object containing all the properties given by
  the parent to a child component. For example, in the following situation,
  the parent component gives a `user` and a `color` value to the `ChildComponent`.
  ```xml
    <div>
      <ChildComponent user="state.user" color="color">
    </div>
  ```
  Note that `props` are owned by the parent, not by the component.
  As such, it should not ever be modified by the component (otherwise you risk
  unintended effects, since the parent may not be aware of the change)!!
  The `props` can be modified dynamically by the parent. In that case, the
  component will go through the following lifecycle methods: `willUpdateProps`,
  `willPatch` and `patched`.
 ### Static Properties
 - **`template`** (string, optional): if given, this is the name of the QWeb template that will render the component. Note that there is a helper `xml` to
  make it easy to define an inline template.
 * **`components`** (Object, optional): if given, this is an object that contains
  the classes of any sub components needed by the template. This is the main way
  used by Owl to be able to create sub components.
  ```js
  class ParentComponent extends owl.Component {
    static components = { SubComponent };
  }
  ```
 * **`props`** (Object, optional): if given, this is an object that describes the
  type and shape of the (actual) props given to the component. If Owl mode is
  `dev`, this will be used to validate the props each time the component is
  created/updated. See [Props Validation](props_validation.md) for more information.
  ```js
  class Counter extends owl.Component {
    static props = {
      initialValue: Number,
      optional: true,
    };
  }
  ```
 - **`defaultProps`** (Object, optional): if given, this object define default
  values for (top-level) props. Whenever `props` are given to the object, they
  will be altered to add default value (if missing). Note that it does not
  change the initial object, a new object will be created instead.
  ```js
  class Counter extends owl.Component {
    static defaultProps = {
      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
 component.
 ### Methods
 We explain here all the public methods of the `Component` class.
 - **`mount(target, options)`** (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.
  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
  not be called. This is sometimes useful if we want to load an application in
  memory. In that case, we need to mount the root component again in an element
  which is in the DOM:
  ```js
  const app = new App();
  await app.mount(document.createDocumentFragment());
  // app is rendered in memory, but not active
  await app.mount(document.body);
  // app is now visible
  ```
  Note that the normal way of mounting an application is by using the `mount`
  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
  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
  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
  can be useful if we are handling large number of components. Since this is an
  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,
  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
  framework instead.
 Obviously, these methods are reserved for Owl, and should not be used by Owl
 users, unless they want to override them. Also, Owl reserves all method names
 starting with `__`, in order to prevent possible future conflicts with user code
 whenever Owl needs to change.
 ### Lifecycle
 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                                                 |
 | ------------------------------------------------ | ----------------------------------------------------------- |
 | **[setup](#setup)**                              | setup                                                       |
 | **[willStart](#willstart)**                      | async, before first rendering                               |
 | **[mounted](#mounted)**                          | just after component is rendered and added to the DOM       |
 | **[willUpdateProps](#willupdatepropsnextprops)** | async, before props update                                  |
 | **[willPatch](#willpatch)**                      | just before the DOM is patched                              |
 | **[patched](#patchedsnapshot)**                  | just after the DOM is patched                               |
 | **[willUnmount](#willunmount)**                  | just before removing component from DOM                     |
 | **[catchError](#catcherrorerror)**               | catch errors (see [error handling page](error_handling.md)) |
 Notes:
 - hooks call order is precisely defined: `[willX]` hooks are called first on parent,
  then on children, and `[Xed]` are called in the reverse order: first children,
  then parent.
 - no hook method should ever be called manually. They are supposed to be
  called by the owl framework whenever it is required.
 #### `constructor(parent, props)`
 The constructor is not exactly a hook, it is the regular,
 normal, constructor of the component. Since it is not a hook, you need to make
 sure that `super` is called.
 This is usually where you would set the initial state and the template of the
 component.
 ```javascript
  constructor(parent, props) {
    super(parent, props);
    this.state = useState({someValue: true});
    this.template = 'mytemplate';
  }
 ```
 Note that with ESNext class fields, the constructor method does not need to be
 implemented in most cases:
 ```javascript
 class ClickCounter extends owl.Component {
  state = useState({ value: 0 });
  ...
 }
 ```
 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
 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. Another use case is to load data from a server.
 ```javascript
  async willStart() {
    await owl.utils.loadJS("my-awesome-lib.js");
  }
 ```
 At this point, the component is not yet rendered. Note that a slow `willStart` method will slow down the rendering of the user
 interface. Therefore, some care should be made to make this method as
 fast as possible.
 #### `mounted()`
 `mounted` is called each time a component is attached to the
 DOM, after the initial rendering and possibly later if the component was unmounted
 and remounted. At this point, the component is considered _active_. 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.
 It is the opposite of `willUnmount`. If a component has been mounted, it will
 always be unmounted at some point in the future.
 The mounted method will be called recursively on each of its children. First,
 the parent, then all its children.
 It is allowed (but not encouraged) to modify the state in the `mounted` hook.
 Doing so will cause a rerender, which will not be perceptible by the user, but
 will slightly slow down the component.
 #### `willUpdateProps(nextProps)`
 The willUpdateProps is an asynchronous hook, called just before new props
 are set. This is useful if the component needs to perform an asynchronous task,
 depending on the props (for example, assuming that the props are
 some record Id, fetching the record data).
 ```javascript
  willUpdateProps(nextProps) {
    return this.loadData({id: nextProps.id});
  }
 ```
 This hook is not called during the first render (but willStart is called
 and performs a similar job).
 #### `willPatch()`
 The willPatch hook is called just before the DOM patching process starts.
 It is not called on the initial render. This is useful to read
 information from the DOM. For example, the current position of the
 scrollbar.
 Note that modifying the state is not allowed here. This method is called just
 before an actual DOM patch, and is only intended to be used to save some local
 DOM state. Also, it will not be called if the component is not in the DOM.
 #### `patched(snapshot)`
 This hook is called whenever a component did actually update its DOM (most
 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
 not in the DOM.
 Updating the component state in this hook is possible, but not encouraged.
 One needs to be careful, because updates here will create an additional rendering, which in
 turn will cause other calls to the `patched` method. So, we need to be particularly
 careful at avoiding endless cycles.
 #### `willUnmount()`
 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 listeners, for example.
 ```javascript
  mounted() {
    this.env.bus.on('someevent', this, this.doSomething);
  }
  willUnmount() {
    this.env.bus.off('someevent', this, this.doSomething);
  }
 ```
 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
 [error handling](error_handling.md).
 ### Root Component
 Most of the time, an Owl component will be created automatically by a tag (or the `t-component`
 directive) in a template. There is however an obvious exception: the root component
 of an Owl application has to be created manually:
 ```js
 class App extends owl.Component { ... }
 const app = new App();
 app.mount(document.body);
 ```
 The root component does not have a parent nor `props` (see note below). It will be setup with an
 [environment](environment.md) (either the `env` defined on its class, or a
 default empty environment).
 Note: a root component can however be given a `props` object in its constructor,
 like this: `new App(null, {some: 'object'});`. It will not be a true `props`
 object, managed by Owl (so, for example, it will never be updated).
 ### Composition
 The example above shows a QWeb template with a sub component. In a template,
 components are declared with a tagname corresponding to the class name. It has
 to be capitalized.
 ```xml
 <div t-name="ParentComponent">
  <span>some text</span>
  <MyComponent info="13" />
 </div>
 ```
 ```js
 class ParentComponent extends owl.Component {
    static components = { MyComponent: MyComponent};
    ...
 }
 ```
 In this example, the `ParentComponent`'s template creates a component `MyComponent` just
 after the span. The `info` key will be added to the subcomponent's `props`. Each
 `props` is a string which represents a javascript (QWeb) expression, so it is
 dynamic. If it is necessary to give a string, this can be done by quoting it:
 `someString="'somevalue'"`.
 Note that the rendering context for the template is the component itself. This means
 that the template can access `state` (if it exists), `props`, `env`, or any
 methods defined in the component.
 ```xml
 <div t-name="ParentComponent">
    <ChildComponent count="state.val" />
 </div>
 ```
 ```js
 class ParentComponent {
  static components = { ChildComponent };
  state = useState({ val: 4 });
 }
 ```
 Whenever the template is rendered, it will automatically create the subcomponent
 `ChildComponent` at the correct place. It needs to find the reference to the
 actual component class in the special static `components` key, or the class registered in
 QWeb's global registry (see `register` function of QWeb). It first looks inside
 the static `components` key, then fallbacks on the global registry.
 _Props_: In this example, the child component will receive the object `{count: 4}` in its
 constructor. This will be assigned to the `props` variable, which can be accessed
 on the component (and also, in the template). Whenever the state is updated, then
 the sub component will also be updated automatically. See the [props section](props.md)
 for more information.
 **CSS and style:** Owl allows the parent to declare
 additional css classes or style for the sub component: css declared in `class`, `style`, `t-att-class` or `t-att-style` will be added to the
 root component element.
 ```xml
 <div t-name="ParentComponent">
  <MyComponent class="someClass" style="font-weight:bold;" info="13" />
 </div>
 ```
 Warning: there is a small caveat with dynamic class attributes: since Owl needs
 to be able to add/remove proper classes whenever necessary, it needs to be aware
 of the possible classes. Otherwise, it will not be able to make the difference
 between a valid css class added by the component, or other custom code, and a
 class that need to be removed. This is why we only support the explicit syntax
 with a class object:
 ```xml
 <MyComponent t-att-class="{a: state.flagA, b: state.flagB}" />
 ```
 ### Form Input Bindings
 It is very common to need to be able to read the value out of an html `input` (or
 `textarea`, or `select`) in order to use it (note: it does not need to be in a
 form!). A possible way to do this is to do it by hand:
 ```js
 class Form extends owl.Component {
  state = useState({ text: "" });
  _updateInputValue(event) {
    this.state.text = event.target.value;
  }
 }
 ```
 ```xml
 <div>
  <input t-on-input="_updateInputValue" />
  <span t-esc="state.text" />
 </div>
 ```
 This works. However, this requires a little bit of _plumbing_ code. Also, the
 plumbing code is slightly different if you need to interact with a checkbox,
 or with radio buttons, or with select tags.
 To help with this situation, Owl has a builtin directive `t-model`: its value
 should be an observed value in the component (usually `state.someValue`). With
 the `t-model` directive, we can write a shorter code, equivalent to the previous
 example:
 ```js
 class Form extends owl.Component {
  state = { text: "" };
 }
 ```
 ```xml
 <div>
  <input t-model="state.text" />
  <span t-esc="state.text" />
 </div>
 ```
 The `t-model` directive works with `<input>`, `<input type="checkbox">`,
 `<input type="radio">`, `<textarea>` and `<select>`:
 ```xml
 <div>
    <div>Text in an input: <input t-model="state.someVal"/></div>
    <div>Textarea: <textarea t-model="state.otherVal"/></div>
    <div>Boolean value: <input type="checkbox" t-model="state.someFlag"/></div>
    <div>Selection:
        <select t-model="state.color">
            <option value="">Select a color</option>
            <option value="red">Red</option>
            <option value="blue">Blue</option>
        </select>
    </div>
    <div>
        Selection with radio buttons:
        <span>
            <input type="radio" name="color" id="red" value="red" t-model="state.color"/>
            <label for="red">Red</label>
        </span>
        <span>
            <input type="radio" name="color" id="blue" value="blue" t-model="state.color" />
            <label for="blue">Blue</label>
        </span>
    </div>
 </div>
 ```
 Like event handling, the `t-model` directive accepts the following modifiers:
 | Modifier  | Description                                                          |
 | --------- | -------------------------------------------------------------------- |
 | `.lazy`   | update the value on the `change` event (default is on `input` event) |
 | `.number` | try to parse the value to a number (using `parseFloat`)              |
 | `.trim`   | trim the resulting value                                             |
 For example:
 ```xml
 <input t-model.lazy="state.someVal" />
 ```
 These modifiers can be combined. For instance, `t-model.lazy.number` will only
 update a number whenever the change is done.
 Note: the online playground has an example to show how it works.
 ### References
 The `useRef` hook is useful when we need a way to interact with some inside part
 of a component, rendered by Owl. It can work either on a DOM node, or on a component,
 tagged by the `t-ref` directive. See the [hooks section](hooks.md#useref) for
 more detail.
 As a short example, here is how we could set the focus on a given input:
 ```xml
 <div>
    <input t-ref="input"/>
    <button t-on-click="focusInput">Click</button>
 </div>
 ```
 ```js
 import { useRef } from "owl/hooks";
 class SomeComponent extends Component {
  inputRef = useRef("input");
  focusInput() {
    this.inputRef.el.focus();
  }
 }
 ```
 The `useRef` hook can also be used to get a reference to an instance of a sub
 component rendered by Owl. In that case, we need to access it with the `comp`
 property instead of `el`:
 ```xml
 <div>
    <SubComponent t-ref="sub"/>
    <button t-on-click="doSomething">Click</button>
 </div>
 ```
 ```js
 import { useRef } from "owl/hooks";
 class SomeComponent extends Component {
  static components = { SubComponent };
  subRef = useRef("sub");
  doSomething() {
    this.subRef.comp.doSomeThingElse();
  }
 }
 ```
 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.
 ### Dynamic sub components
 It is not common, but sometimes we need a dynamic component name. In this case,
 the `t-component` directive can also be used to accept dynamic values with string interpolation (like the [`t-attf-`](qweb_templating_language.md#dynamic-attributes) directive):
 ```xml
 <div t-name="ParentComponent">
    <t t-component="ChildComponent{{id}}" />
 </div>
 ```
 ```js
 class ParentComponent {
  static components = { ChildComponent1, ChildComponent2 };
  state = { id: 1 };
 }
 ```
 There is an even more dynamic way to use `t-component`: its value can be an
 expression evaluating to an actual component class. In that case, this is the
 class that will be used to create the component:
 ```js
 class A extends Component<any, any, any> {
  static template = xml`<span>child a</span>`;
 }
 class B extends Component<any, any, any> {
  static template = xml`<span>child b</span>`;
 }
 class App extends Component<any, any, any> {
  static template = xml`<t t-component="myComponent" t-key="state.child"/>`;
  state = { child: "a" };
  get myComponent() {
    return this.state.child === "a" ? A : B;
  }
 }
 ```
 In this example, the component `App` selects dynamically the concrete sub
 component class.
 Note that the `t-component` directive can only be used on `<t>` nodes.
 ### Functional Components
 Owl does not exactly have functional components. However, there is an extremely
 close alternative: calling sub templates.
 A stateless functional component in react is usually some kind of function that
 maps props to a virtual dom (often with `jsx`). So, basically, almost like a
 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>`;
 class MyComponent extends Component {
  static template = xml`
        <div>
            <t t-call=${Welcome}/>
            <div>something</div>
        </div>
    `;
 }
 ```
 The way this works is that sub templates are inlined, and have access to the
 ambient context. They can therefore access `props`, and any other part of the
 caller component.
 ### SVG Components
 Owl components can be used to generate dynamic SVG graphs:
 ```js
 class Node extends Component {
  static template = xml`
        <g>
            <circle t-att-cx="props.x" t-att-cy="props.y" r="4" fill="black"/>
            <text t-att-x="props.x - 5" t-att-y="props.y + 18"><t t-esc="props.node.label"/></text>
            <t t-set="childx" t-value="props.x + 100"/>
            <t t-set="height" t-value="props.height/(props.node.children || []).length"/>
            <t t-foreach="props.node.children || []" t-as="child">
                <t t-set="childy" t-value="props.y + child_index*height"/>
                <line t-att-x1="props.x" t-att-y1="props.y" t-att-x2="childx" t-att-y2="childy" stroke="black" />
                <Node x="childx" y="childy" node="child" height="height"/>
            </t>
        </g>
    `;
  static components = { Node };
 }
 class RootNode extends Component {
  static template = xml`
        <svg height="180">
            <Node node="graph" x="10" y="20" height="180"/>
        </svg>
    `;
  static components = { Node };
  graph = {
    label: "a",
    children: [
      { label: "b" },
      { label: "c", children: [{ label: "d" }, { label: "e" }] },
      { label: "f", children: [{ label: "g" }] },
    ],
  };
 }
 ```
 This `RootNode` component will then display a live SVG representation of the
 graph described by the `graph` property. Note that there is a recursive structure
 here: the `Node` component uses itself as a subcomponent.
 Note that since SVG needs to be handled in a specific way (its namespace needs
 to be properly set), there is a small constraint for Owl components: if an owl
 component is supposed to be a part of an svg graph, then its root node needs to
 be a `g` tag, so Owl can properly set the namespace.
@@ -0,0 +1,181 @@
 # 🦉 Concurrency Model 🦉
 ## Content
 - [Overview](#overview)
 - [Rendering Components](#rendering-components)
 - [Semantics](#semantics)
 - [Asynchronous Rendering](#asynchronous-rendering)
 ## Overview
 Owl was designed from the very beginning with asynchronous components. This comes
 from the `willStart` and the `willUpdateProps` lifecycle hooks. With these
 methods, it is possible to build complex highly concurrent applications.
 Owl concurrent mode has several benefits: it makes it possible to delay the
 rendering until some asynchronous operation is complete, it makes it possible
 to lazy load libraries, while keeping the previous screen completely functional.
 It is also good for performance reasons: Owl uses it to only apply the result of
 many different renderings only once in an animation frame. Owl can cancel
 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.
 ## Rendering Components
 The word _rendering_ is a little vague, so, let us explain more precisely the
 process by which Owl components are displayed on a screen.
 When a component is mounted or updated, a new rendering is started. It has
 two phases: _virtual rendering_ and _patching_.
 ### Virtual rendering
 This phase represent the process of rendering a template, in memory, which create a virtual representation of the desired component html). The output of this phase is a
 virtual DOM.
 It is asynchronous: each subcomponents needs to either be created (so, `willStart`
 will need to be called), or updated (which is done with the `willUpdateProps`
 method). This is completely a recursive process: a component is the root of a
 component tree, and each sub component needs to be (virtually) rendered.
 ### Patching
 Once a rendering is complete, it will be applied on the next animation frame.
 This is done synchronously: the whole component tree is patched to the real
 DOM.
 ## Semantics
 We give here an informal description of the way components are created/updated
 in an application. Here, ordered lists describe actions that are executed
 sequentially, bullet lists describe actions that are executed in parallel.
 **Scenario 1: initial rendering** Imagine we want to render the following component tree:
 ```
        A
       / \
      B   C
         / \
        D   E
 ```
 Here is what happen whenever we mount the root
 component (with some code like `app.mount(document.body)`).
 1. `willStart` is called on `A`
 2. when it is done, template `A` is rendered.
   - component `B` is created
     1. `willStart` is called on `B`
     2. template `B` is rendered
   - component `C` is created
     1. `willStart` is called on `C`
     2. template `C` is rendered
        - component `D` is created
          1. `willStart` is called on `D`
          2. template `D` is rendered
        - component `E` is created
          1. `willStart` is called on `E`
          2. template `E` is rendered
 3. each components are patched into a detached DOM element, in the following order:
   `E`, `D`, `C`, `B`, `A`. (so the actual full DOM tree is created
   in one pass)
 4. the component `A` root element is actually appended to `document.body`
 5. The method `mounted` is called recursively on all components in the following
   order: `E`, `D`, `C`, `B`, `A`.
 **Scenario 2: rerendering a component**. Now, let's assume that the user clicked on some
 button in `C`, and this results in a state update, which is supposed to:
 - update `D`,
 - remove `E`,
 - add new component `F`.
 So, the component tree should look like this:
 ```
        A
       / \
      B   C
         / \
        D   F
 ```
 Here is what Owl will do:
 1. because of a state change, the method `render` is called on `C`
 2. template `C` is rendered again
   - component `D` is updated:
     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)
     2. template `F` is rendered
 3. `willPatch` hooks are called recursively on components `C`, `D` (not on `F`,
   because it is not mounted yet)
 4. components `F`, `D` are patched in that order
 5. component `C` is patched, which will cause recursively:
   1. `willUnmount` hook on `E`
   2. destruction of `E`,
 6. `mounted` hook is called on `F`, `patched` hooks are called on `D`, `C`
 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).
 ### Asynchronous Rendering
 Working with asynchronous code always adds a lot of complexity to a system. Whenever
 different parts of a system are active at the same time, one needs to think
 carefully about all possible interactions. Clearly, this is also true for Owl
 components.
 There are two different common problems with Owl asynchronous rendering model:
 - any component can delay the rendering (initial and subsequent) of the whole
  application
 - for a given component, there are two independant situations that will trigger an
  asynchronous rerendering: a change in the state, or a change in the props.
  These changes may be done at different times, and Owl has no way of knowing
  how to reconcile the resulting renderings.
 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
   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
   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
   be used on an asynchronous component, to prevent it from delaying the
   rendering of the whole interface, or on a synchronous one, such that its
   rendering isn't delayed by other (asynchronous) components. Note that this
   directive has no effect on the first rendering, but only on subsequent ones
   (triggered by state or props changes).
   ```xml
   <div t-name="ParentComponent">
     <SyncChild />
     <AsyncRoot>
        <AsyncChild/>
     </AsyncRoot>
   </div>
   ```
@@ -0,0 +1,44 @@
 # 🦉 Config 🦉
 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:
 - [`mode`](#mode) (default value: `prod`),
 - [`enableTransitions`](#enabletransitions) (default value: `true`).
 ## Mode
 By default, Owl is in _production_ mode, this means that it will try to do its
 job fast, and skip some expensive operations. However, it is sometimes necessary
 to have better information on what is going on, this is the purpose
 of the `dev` mode.
 Owl has a mode flag, in `owl.config.mode`. Its default value is `prod`, but
 it can be set to `dev`:
 ```js
 owl.config.mode = "dev";
 ```
 Note that templates compiled with the `prod` settings will not be recompiled.
 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.
@@ -0,0 +1,36 @@
 # 🦉 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.
@@ -0,0 +1,105 @@
 # 🦉 Context 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
  - [`Context`](#context)
  - [`useContext`](#usecontext)
 ## Overview
 The `Context` object provides a way to share data between an arbitrary number
 of components. 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.
 ## Example
 Assume that we have an application with various components which needs to render
 differently depending on the size of the device. Here is how we could proceed
 to make sure that the information is properly shared. First, let us create a
 context, and add it to the environment:
 ```js
 const deviceContext = new Context({ isMobile: true });
 App.env.deviceContext = deviceContext;
 ```
 If we want to make it completely responsive, we need to update its value whenever
 the size of the screen is updated:
 ```js
 const isMobile = () => window.innerWidth <= 768;
 window.addEventListener(
  "resize",
  owl.utils.debounce(() => {
    const state = deviceContext.state;
    if (state.isMobile !== isMobile()) {
      state.isMobile = !state.isMobile;
    }
  }, 15)
 );
 ```
 Then, each component that want can subscribe and render differently depending on the
 fact that we are in a mobile or desktop mode.
 ```js
 class SomeComponent extends Component {
  static template = xml`
    <div>
      <t t-if=device.isMobile>
          some simplified user interface
      </t>
      <t t-else="">
          a more advanced user interface
      </t>
    </div>`;
  device = useContext(this.env.deviceContext);
 }
 ```
 ## Reference
 ### `Context`
 A `Context` object should be created with a state object:
 ```js
 const someContext = new Context({ some: "key" });
 ```
 Its state is now available in the `state` key:
 ```js
 someContext.state.some = "other key";
 ```
 This is the way some global code (such as the responsive code above) should
 read and update the context state. However, components should not ever read the
 context state directly from the context, they should instead use the `useContext`
 hook to properly register themselves to state changes.
 Note that the `Context` hook is different from the React version. For example,
 there is no concept of provider/consumer. So, the `Context` feature does not
 by itself allow the use of a different context state depending on the component
 place in the component tree. However, this functionality can be obtained, if
 necessary, with the use of sub environment.
 ### `useContext`
 The `useContext` hook is the normal way for a component to register themselve
 to context state changes. The `useContext` method returns the context state:
 ```js
 device = useContext(this.env.deviceContext);
 ```
 It is a simple observed state (with an owl `Observer`), which contains the shared
 information.
@@ -0,0 +1,136 @@
 # 🦉 Environment 🦉
 ## Content
 - [Overview](#overview)
 - [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
 An environment is an object which contains a [`QWeb` instance](qweb_engine.md). Whenever
 a root component is created, it is assigned an environment (see
 [below](#setting-an-environment) for more info on this). This environment is
 then automatically given to each sub component (and accessible in the `this.env`
 property).
 ```
    Root
    /  \
   A    B
 ```
 This way, all components share the same `QWeb` instance. Owl internally requires
 that the environment has a `qweb` key which maps to a
 [`QWeb`](qweb_engine.md) instance. This is the QWeb instance that will be used to
 render each templates in this specific component tree. Note that if no `QWeb`
 instance is provided, Owl will simply generate it on the fly.
 The environment is mostly static. Each application is free to add anything to
 the environment, which is very useful, since this can be accessed by each sub
 component.
 ## Setting an environment
 An Owl application needs an [environment](environment.md) to be executed. The
 environment has an important key: the [QWeb](qweb_engine.md) instance, which will render
 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,
  this will 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 = {
    _t: myTranslateFunction,
    user: {...},
    services: {
        ...
    },
 };
 mount(App, { target: document.body, env });
 ```
 It is also possible to simply share an environment between all root components,
 by simply doing this:
 ```js
 Component.env = myEnv; // will be the default env for all components
 ```
 Note that this environment is the global owl environment for an application. The
 next section explains how to extend an environment for a specific sub component
 and its children.
 ## Using a sub environment
 It is sometimes useful to add one (or more) specific keys to the environment,
 from the perspective of a specific component and its children. In that case, the
 solution presented above will not work, since it sets the global environment.
 There is a hook for this situation: [`useSubEnv`](hooks.md#usesubenv).
 ```js
 class FormComponent extends Component {
  constructor(parent, props) {
    super(parent, props);
    useSubEnv({ myKey: someValue });
  }
 }
 ```
 ## Content of an Environment
 Some good use cases for additional keys in the environment are:
 - some configuration keys,
 - session information,
 - generic services (such as doing rpcs).
 Doing it this way means that components are easily testable: we can simply
 create a test environment with mock services.
 For example:
 ```js
 async function myEnv() {
  const templates = await loadTemplates();
  const qweb = new QWeb({ templates });
  const session = getSession();
  return {
    _t: myTranslateFunction,
    session: session,
    qweb: qweb,
    services: {
      localStorage: localStorage,
      rpc: rpc,
    },
    debug: false,
    inMobileMode: true,
  };
 }
 async function start() {
  const env = await myEnv();
  mount(App, { target: document.body, env });
 }
 ```
 ## 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.
@@ -0,0 +1,81 @@
 # 🦉 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
 });
 ```
@@ -0,0 +1,25 @@
 # 🦉 Event Bus 🦉
 It is sometimes useful to use a `Bus` to communicate informations between various
 parts of the code. Owl has a very simple bus class, which manages subscriptions,
 triggering events, and callbacks.
 ```js
 const bus = new owl.core.EventBus();
 bus.on("some-event", null, function (...args) {
  console.log(...args);
 });
 bus.trigger("some-event", 1, 2, 3);
 // [1,2,3] will be logged to the console
 ```
 Its API is:
 | Method                           | Description                       |
 | -------------------------------- | --------------------------------- |
 | `on(eventType, owner, callback)` | add a listener                    |
 | `off(eventType, owner)`          | remove all listeners for an owner |
 | `trigger(eventType, ...args)`    | trigger an event                  |
 | `clear`                          | remove all subscriptions          |
@@ -0,0 +1,151 @@
 # 🦉 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.
@@ -0,0 +1,436 @@
 # 🦉 Hooks 🦉
 ## Content
 - [Overview](#overview)
 - [Example: Mouse Position](#example-mouse-position)
 - [Example: Autofocus](#example-autofocus)
 - [Reference](#reference)
  - [One Rule](#one-rule)
  - [`useState`](#usestate)
  - [`onMounted`](#onmounted)
  - [`onWillUnmount`](#onwillunmount)
  - [`onWillPatch`](#onwillpatch)
  - [`onPatched`](#onpatched)
  - [`onWillStart`](#onwillstart)
  - [`onWillUpdateProps`](#onwillupdateprops)
  - [`useContext`](#usecontext)
  - [`useRef`](#useref)
  - [`useSubEnv`](#usesubenv)
  - [`useExternalListener`](#useexternallistener)
  - [`useComponent`](#usecomponent)
  - [`useEnv`](#useenv)
  - [Making customized hooks](#making-customized-hooks)
 ## Overview
 Hooks were popularised by React as a way to solve the following issues:
 - help reusing stateful logic between components
 - help organizing code by feature in complex components
 - use state in functional components, without writing a class.
 Owl hooks serve the same purpose, except that they work for class components
 (note: React hooks do not work on class components, and maybe because of that,
 there seems to be the misconception that hooks are in opposition to class. This
 is clearly not true, as shown by Owl hooks).
 Hooks work beautifully with Owl components: they solve the problems mentioned
 above, and in particular, they are the perfect way to make your component
 reactive.
 ## Example: mouse position
 Here is the classical example of a non trivial hook to track the mouse position.
 ```js
 const { useState, onMounted, onWillUnmount } = owl.hooks;
 // We define here a custom behaviour: this hook tracks the state of the mouse
 // position
 function useMouse() {
  const position = useState({ x: 0, y: 0 });
  function update(e) {
    position.x = e.clientX;
    position.y = e.clientY;
  }
  onMounted(() => {
    window.addEventListener("mousemove", update);
  });
  onWillUnmount(() => {
    window.removeEventListener("mousemove", update);
  });
  return position;
 }
 // Main root component
 class App extends owl.Component {
  static template = xml`
    <div t-name="App">
      <div>Mouse: <t t-esc="mouse.x"/>, <t t-esc="mouse.y"/></div>
    </div>`;
  // this hooks is bound to the 'mouse' property.
  mouse = useMouse();
 }
 ```
 Note that we use the prefix `use` for hooks, just like in React. This is just
 a convention.
 ## Example: autofocus
 Hooks can be combined to create the desired effect. For example, the following
 hook combines the `useRef` hook with the `onPatched` and `onMounted` functions
 to create an easy way to focus an input whenever it appears in the DOM:
 ```js
 function useAutofocus(name) {
  let ref = useRef(name);
  let isInDom = false;
  function updateFocus() {
    if (!isInDom && ref.el) {
      isInDom = true;
      ref.el.focus();
    } else if (isInDom && !ref.el) {
      isInDom = false;
    }
  }
  onPatched(updateFocus);
  onMounted(updateFocus);
 }
 ```
 This hook takes the name of a valid `t-ref` directive, which should be present
 in the template. It then checks whenever the component is mounted or patched if
 the reference is not valid, and in this case, it will focus the node element.
 This hook can be used like this:
 ```js
 class SomeComponent extends Component {
  static template = xml`
    <div>
        <input />
        <input t-ref="myinput"/>
    </div>`;
  constructor(...args) {
    super(...args);
    useAutofocus("myinput");
  }
 }
 ```
 ## Reference
 ### 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:
 ```js
 // ok
 class SomeComponent extends Component {
  state = useState({ value: 0 });
 }
 // also ok
 class SomeComponent extends Component {
  constructor(...args) {
    super(...args);
    this.state = useState({ value: 0 });
  }
 }
 // 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() {
    this.state = useState({ value: 0 });
  }
 }
 ```
 As you can see, the `useState` hook does not need to be given a reference to
 the component. This is possible because there is a way to get a reference to the
 current component: the `Component.current` static property is the reference to the
 component instance that is currently being created.
 Hooks need to be called in the constructor to ensure that this reference is
 properly set. This is also a good thing for performance reasons (Owl can use
 this to optimize its implementation), and for a clean architecture (this makes
 it easier for developers to understand what is really happening in a component).
 ### `useState`
 The `useState` hook is certainly the most important hook for Owl components:
 this is what allows a component to be reactive, to react to state change.
 The `useState` hook has to be given an object or an array, and will return
 an observed version of it (using a `Proxy`).
 ```javascript
 const { useState } = owl.hooks;
 class Counter extends owl.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++;
  }
 }
 ```
 It is important to remember that `useState` only works with objects or arrays. It
 is necessary, since Owl needs to react to a change in state.
 ### `onMounted`
 `onMounted` is not a user hook, but is a building block designed to help make useful
 abstractions. `onMounted` registers a callback, which will be called when the component
 is mounted (see example on top of this page).
 ### `onWillUnmount`
 `onWillUnmount` is not a user hook, but is a building block designed to help make useful
 abstractions. `onWillUnmount` registers a callback, which will be called when the component
 is unmounted (see example on top of this page).
 ### `onWillPatch`
 `onWillPatch` is not a user hook, but is a building block designed to help make useful
 abstractions. `onWillPatch` registers a callback, which will be called just
 before the component patched.
 ### `onPatched`
 `onPatched` is not a user hook, but is a building block designed to help make useful
 abstractions. `onPatched` registers a callback, which will be called just
 after the component patched.
 ### `onWillStart`
 `onWillStart` is an asynchronous hook. This means that the function registered
 in the hook will be run just before the component is first rendered and can return a
 promise, to express the fact that it is an asynchronous operation.
 Note that if there are more than one `onWillStart` registered callback, then they
 will all be run in parallel.
 It can be used to load some initial data. For example, the following hook will
 automatically load some data from the server, and return an object that will
 be ready whenever the component is rendered:
 ```js
 function useLoader() {
  const component = Component.current;
  const record = useState({});
  onWillStart(async () => {
    const recordId = component.props.id;
    Object.assign(record, await fetchSomeRecord(recordId));
  });
  return record;
 }
 ```
 Note that this example does not update the record value whenever props are
 updated. For that situation, we need to use the `onWillUpdateProps` hook.
 ### `onWillUpdateProps`
 Just like `onWillStart`, `onWillUpdateProps` is an asynchronous hook. It is
 designed to be run whenever the component props are updated. This could be
 useful to perform some asynchronous task such as fetching updated data.
 ```js
 function useLoader() {
  const component = Component.current;
  const record = useState({});
  async function updateRecord(id) {
    Object.assign(record, await fetchSomeRecord(id));
  }
  onWillStart(() => updateRecord(component.props.id));
  onWillUpdateProps((nextProps) => updateRecord(nextProps.id));
  return record;
 }
 ```
 Note that if there are more than one `onWillUpdateProps` registered callback,
 then they will all be run in parallel.
 ### `useContext`
 See [`useContext`](context.md#usecontext) for reference documentation.
 ### `useRef`
 The `useRef` hook is useful when we need a way to interact with some inside part
 of a component, rendered by Owl. It can work either on a DOM node, or on a component,
 tagged by the `t-ref` directive:
 ```xml
 <div>
    <div t-ref="someDiv"/>
    <SubComponent t-ref="someComponent"/>
 </div>
 ```
 In this example, the component will be able to access the `div` and the component
 `SubComponent` using the `useRef` hook:
 ```js
 class Parent extends Component {
  subRef = useRef("someComponent");
  divRef = useRef("someDiv");
  someMethod() {
    // here, if component is mounted, refs are active:
    // - this.divRef.el is the div HTMLElement
    // - this.subRef.comp is the instance of the sub component
    // - this.subRef.el is the root HTML node of the sub component (i.e. this.subRef.comp.el)
  }
 }
 ```
 As shown by the example above, html elements are accessed by using the `el`
 key, and components references are accessed with `comp`.
 Notes:
 - if used on a component, the reference will be set in the `refs`
  variable between `willPatch` and `patched`,
 - on a component, accessing `ref.el` will get the root node of the component.
 The `t-ref` directive also accepts dynamic values with string interpolation
 (like the [`t-attf-`](qweb_templating_language.md#dynamic-attributes) and
 `t-component` directives). For example,
 ```xml
 <div t-ref="component_{{someCondition ? '1' : '2'}}"/>
 ```
 Here, the references need to be set like this:
 ```js
 this.ref1 = useRef("component_1");
 this.ref2 = useRef("component_2");
 ```
 References are only guaranteed to be active while the parent component is mounted.
 If this is not the case, accessing `el` or `comp` on it will return `null`.
 ### `useSubEnv`
 The environment is sometimes useful to share some common information between
 all components. But sometimes, we want to _scope_ that knowledge to a subtree.
 For example, if we have a form view component, maybe we would like to make some
 `model` object available to all sub components, but not to the whole application.
 This is where the `useSubEnv` hook may be useful: it lets a component add some
 information to the environment in a way that only the component and its children
 can access it:
 ```js
 class FormComponent extends Component {
  constructor(...args) {
    super(...args);
    const model = makeModel();
    useSubEnv({ model });
  }
 }
 ```
 The `useSubEnv` takes one argument: an object which contains some key/value that
 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`
 The `useExternalListener` hook helps solve a very common problem: adding and removing
 a listener on some target whenever a component is mounted/unmounted. For example,
 a dropdown menu (or its parent) may need to listen to a `click` event on `window`
 to be closed:
 ```js
 useExternalListener(window, "click", this.closeMenu);
 ```
 ### Making customized hooks
 Hooks are a wonderful way to organize the code of a complex component by feature
 instead of by lifecycle methods. They are like mixins, except that they can be
 easily composed together.
 But, like every good things in life, hooks should be used with moderation. They are
 not the solution to every problem.
 - they may be overkill: if your component needs to perform some action specific
  to itself (so, the specific code does not need to be shared), there is nothing
  wrong with a simple class method:
  ```js
  // maybe overkill
  class A extends Component {
    constructor(...args) {
      super(...args);
      useMySpecificHook();
    }
  }
  // ok
  class B extends Component {
    constructor(...args) {
      super(...args);
      this.performSpecificTask();
    }
  }
  ```
  Note that the second solution is easier to extend in sub components.
 - they may be harder to test: if a customized hook injects some external side
  effect dependency, then it is harder to test without doing some non obvious
  manipulation. For example, assume that we want to give a reference to a
  router in a `useRouter` hook. We could do this:
  ```js
  const router = new Router(...);
  function useRouter() {
      return router;
  }
  ```
  As you can see, this does not _hook_ into the internal of the component. It
  simply returns a global object, which is difficult to mock.
  A better way would be to do something like this: get the reference from the
  environment.
  ```js
  function useRouter() {
    const env = useEnv();
    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.
@@ -0,0 +1,133 @@
 # 🦉 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
 rendering of that component (and its children) is not tied to the rendering of
 the rest of the interface. It can be used on an asynchronous component, to
 prevent it from delaying the rendering of the whole interface, or on a
 synchronous one, such that its rendering isn't delayed by other (asynchronous)
 components. Note that this directive has no effect on the first rendering, but
 only on subsequent ones (triggered by state or props changes).
 ```xml
 <div t-name="ParentComponent">
  <SyncChild />
  <AsyncRoot>
     <AsyncChild/>
  </AsyncRoot>
 </div>
 ```
 The `AsyncRoot` assumes that there is exactly one root node inside it. It can
 be a dom node or a component.
@@ -0,0 +1,60 @@
 # 🦉 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.
@@ -0,0 +1,52 @@
 # 🦉 Observer 🦉
 Owl needs to be able to react to state changes. For example, whenever the state
 of a component is changed, Owl needs to rerender it. To help with that, there is
 an Observer class. Its job is to observe the state of an object (or array), and
 to react to any change. The observer is implemented with the native `Proxy`
 object. Note that this means that it will not work on older browsers.
 Note that the `Observer` is used by the `useState` and `useContext` hooks. This
 is the way most Owl applications will create observers. For the majority of
 use cases, there is no need to directly instantiate an observer.
 ## Example
 For example, this code will display `update` in the console:
 ```javascript
 const observer = new owl.core.Observer();
 observer.notifyCB = () => console.log("update");
 const obj = observer.observe({ a: { b: 1 } });
 obj.a.b = 2;
 ```
 This example shows that an observer can observe nested properties.
 ## Reference
 **observe** An observer can observe multiple values with the `observe` method.
 This method takes an object or an array as its argument and will return a proxy
 (which is mapped to the initial object/array). With this proxy, the observer
 can detect whenever any internal value is changed.
 **Registering a callback** Whenever an observer sees a state change, it will
 call its `notifyCB` method. No additional information is given to the callback.
 **deepRevNumber** Each observed value has an internal revision number, which
 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 obj = observer.observe({ a: { b: 1 } });
 observer.revNumber(obj.a); // 1
 obj.a.b = 2;
 observer.revNumber(obj.a); // 2
 ```
 The `revNumber` can also return 0, which indicates that the value is not
 observed.
@@ -0,0 +1,97 @@
 # 🦉 Props 🦉
 ## Content
 - [Overview](#overview)
 - [Definition](#definition)
 - [Good Practices](#good-practices)
 - [Dynamic Props](#dynamic-props)
 ## Overview
 In Owl, `props` (short for _properties_) is an object which contains every piece
 of data given to a component by its parent.
 ```js
 class Child extends Component {
  static template = xml`<div><t t-esc="props.a"/><t t-esc="props.b"/></div>`;
 }
 class Parent extends Component {
  static template = xml`<div><Child a="state.a" b="'string'"/></div>`;
  static components = { Child };
  state = useState({ a: "fromparent" });
 }
 ```
 In this example, the `Child` component receives two props from its parent: `a`
 and `b`. They are collected into a `props` object by Owl, with each value being
 evaluated in the context of the parent. So, `props.a` is equal to `'fromparent'` and
 `props.b` is equal to `'string'`.
 Note that `props` is an object that only makes sense from the perspective of the
 child component.
 ## Definition
 The `props` object is made of every attributes defined on the template, with the
 following exceptions:
 - every attribute starting with `t-` are not props (they are QWeb directives),
 - `style` and `class` attributes are excluded as well (they are applied by Owl on
  the root element of the component).
 In the following example:
 ```xml
 <div>
    <ComponentA a="state.a" b="'string'"/>
    <ComponentB t-if="state.flag" model="model"/>
    <ComponentC style="color:red;" class="left-pane" />
 </div>
 ```
 the `props` object contains the following keys:
 - for `ComponentA`: `a` and `b`,
 - for `ComponentB`: `model`,
 - for `ComponentC`: empty object
 ## Good Practices
 A `props` object is a collection of values that come from the parent. As such,
 they are owned by the parent, and should never be modified by the child:
 ```js
 class MyComponent extends Component {
  constructor(parent, props) {
    super(parent, props);
    props.a.b = 43; // Never do that!!!
  }
 }
 ```
 Props should be considered readonly, from the perspective of the child component.
 If there is a need to modify them, then the request to update them should be
 sent to the parent (for example, with an event).
 Any value can go in a props. Strings, objects, classes, or even callbacks could
 be given to a child component (but then, in the case of callbacks, communicating
 with events seems more appropriate).
 ## Dynamic Props
 The `t-props` directive can be used to specify totally dynamic props:
 ```xml
 <div t-name="ParentComponent">
    <Child t-props="some.obj"/>
 </div>
 ```
 ```js
 class ParentComponent {
  static components = { Child };
  some = { obj: { a: 1, b: 2 } };
 }
 ```
@@ -0,0 +1,103 @@
 # 🦉 Props Validation 🦉
 As an application becomes complex, it may be quite unsafe to define props in an informal way. This leads to two issues:
 - hard to tell how a component should be used, by looking at its code.
 - unsafe, it is easy to send wrong props into a component, either by refactoring a component, or one of its parents.
 A props type system solves both issues, by describing the types and shapes
 of the props. Here is how it works in Owl:
 - `props` key is a static key (so, different from `this.props` in a component instance)
 - it is optional: it is ok for a component to not define a `props` key.
 - props are validated whenever a component is created/updated
 - props are only validated in `dev` mode (see [config page](config.md#mode))
 - if a key does not match the description, an error is thrown
 - it validates keys defined in (static) `props`. Additional keys given by the
  parent will cause an error.
 For example:
 ```js
 class ComponentA extends owl.Component {
    static props = ['id', 'url'];
    ...
 }
 class ComponentB extends owl.Component {
  static props = {
    count: {type: Number},
    messages: {
      type: Array,
      element: {type: Object, shape: {id: Boolean, text: String }
    },
   date: Date,
   combinedVal: [Number, Boolean]
  };
  ...
 }
 ```
 - it is an object or a list of strings
 - a list of strings is a simplified props definition, which only lists the name
  of the props. Also, if the name ends with `?`, it is considered optional.
 - all props are by default required, unless they are defined with `optional: true`
  (in that case, validation is only done if there is a value)
 - valid types are: `Number, String, Boolean, Object, Array, Date, Function`, and all
  constructor functions (so, if you have a `Person` class, it can be used as a type)
 - arrays are homogeneous (all elements have the same type/shape)
 For each key, a `prop` definition is either a boolean, a constructor, a list of constructors, or an object:
 - a boolean: indicate that the props exists, and is mandatory.
 - a constructor: this should describe the type, for example: `id: Number` describe
  the props `id` as a number
 - a list of constructors. In that case, this means that we allow more than one
  type. For example, `id: [Number, String]` means that `id` can be either a string
  or a number.
 - an object. This makes it possible to have more expressive definition. The following sub keys are then allowed (but not mandatory):
  - `type`: the main type of the prop being validated
  - `element`: if the type was `Array`, then the `element` key describes the type of each element in the array. If it is not set, then we only validate the array, not its elements,
  - `shape`: if the type was `Object`, then the `shape` key describes the interface of the object. If it is not set, then we only validate the object, not its elements,
  - `validate`: this is a function which should return a boolean to determine if
    the value is valid or not. Useful for custom validation logic.
 Examples:
 ```js
  // only the existence of those 3 keys is documented
  static props = ['message', 'id', 'date'];
 ```
 ```js
  // size is optional
  static props = ['message', 'size?'];
 ```
 ```js
  static props = {
    messageIds: {type: Array, element: Number},  // list of number
    otherArr: {type: Array},   // just array. no validation is made on sub elements
    otherArr2: Array,   // same as otherArr
    someObj: {type: Object},  // just an object, no internal validation
    someObj2: {
      type: Object,
      shape: {
        id: Number,
        name: {type: String, optional: true},
        url: String
      ]},    // object, with keys id (number), name (string, optional) and url (string)
    someFlag: Boolean,     // a boolean, mandatory (even if `false`)
    someVal: [Boolean, Date],   // either a boolean or a date
    otherValue: true,     // indicates that it is a prop
    kindofsmallnumber: {
      type: Number,
      validate: n => (0 <= n && n <= 10)
    },
    size: {
      validate:  e => ["small", "medium", "large"].includes(e)
    },
  };
 ```
@@ -0,0 +1,153 @@
 # 🦉 QWeb Engine 🦉
 ## Content
 - [Overview](#overview)
 - [Reference](#reference)
 ## Overview
 [QWeb](https://www.odoo.com/documentation/13.0/reference/qweb.html) is the primary
 templating engine used by Odoo. The QWeb class in the OWL project is an
 implementation of that specification with a few interesting points:
 - it compiles templates into functions that output a virtual DOM instead of a
  string. This is necessary for the component system.
 - it has a few extra directives: `t-component`, `t-on`, ...
 We present in this section the engine, not the templating language.
 ## Reference
 This section is about the javascript code that implements the `QWeb` specification.
 Owl exports a `QWeb` class in `owl.QWeb`. To use it, it just needs to be
 instantiated:
 ```js
 const qweb = new owl.QWeb();
 ```
 Its API is quite simple:
 - **`constructor(config)`**: constructor. Takes an optional configuration object
  with an optional `templates` string to add initial
  templates (see `addTemplates` for more information on format of the string)
  and an optional `translateFn` translate function (see the section on
  [translations](#translations)).
  ```js
  const qweb = new owl.QWeb({ templates: TEMPLATES, translateFn: _t });
  ```
 - **`addTemplate(name, xmlStr, allowDuplicate)`**: add a specific template.
  ```js
  qweb.addTemplate("mytemplate", "<div>hello</div>");
  ```
  If the optional `allowDuplicate` is set to `true`, then `QWeb` will simply
  ignore templates added for a second time. Otherwise, `QWeb` will crash.
 - **`addTemplates(xmlStr)`**: add a list of templates (identified by `t-name`
  attribute).
  ```js
  const TEMPLATES = `
    <templates>
      <div t-name="App" class="main">main</div>
      <div t-name="OtherComponent">other component</div>
    </templates>`;
  qweb.addTemplates(TEMPLATES);
  ```
 - **`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)).
  ```js
  const vnode = qweb.render("App", component);
  ```
 - **`renderToString(name, context)`**: renders a template, but returns an html
  string.
  ```js
  const str = qweb.renderToString("someTemplate", somecontext);
  ```
 - **`registerTemplate(name, template)`**: static function to register a global
  QWeb template. This is useful for commonly used components accross the
  application, and for making a template available to an application without
  having a reference to the actual QWeb instance.
  ```js
  QWeb.registerTemplate("mytemplate", `<div>some template</div>`);
  ```
 - **`registerComponent(name, Component)`**: static function to register an OWL Component
  to QWeb's global registry. Globally registered Components can be used in
  templates (see the `t-component` directive). This is useful for commonly used
  components accross the application.
  ```js
  class Dialog extends owl.Component { ... }
  QWeb.registerComponent("Dialog", Dialog);
  ...
  class ParentComponent extends owl.Component { ... }
  qweb.addTemplate("ParentComponent", "<div><Dialog/></div>");
  ```
 In some way, a `QWeb` instance is the core of an Owl application. It is the only
 mandatory element of an [environment](environment.md). As such, it
 has an extra responsibility: it can act as an event bus for internal communication
 between Owl classes. This is the reason why `QWeb` actually extends [EventBus](event_bus.md).
 ### 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.
 For example:
 ```js
 const translations = {
  hello: "bonjour",
  yes: "oui",
  no: "non",
 };
 const translateFn = (str) => translations[str] || str;
 const qweb = new QWeb({ translateFn });
 ```
 Once setup, all rendered templates will be translated using `translateFn`:
 - each text node will be replaced with its translation,
 - each of the following attribute values will be translated as well: `title`,
  `placeholder`, `label` and `alt`,
 - translating text nodes can be disabled with the special attribute `t-translation`,
  if its value is `off`.
 So, with the above `translateFn`, the following templates:
 ```xml
 <div>hello</div>
 <div t-translation="off">hello</div>
 <div>Are you sure?</div>
 <input placeholder="hello" other="yes"/>
 ```
 will be rendered as:
 ```xml
 <div>bonjour</div>
 <div>hello</div>
 <div>Are you sure?</div>
 <input placeholder="bonjour" other="yes"/>
 ```
 Note that the translation is done during the compilation of the template, not
 when it is rendered.
@@ -0,0 +1,613 @@
 # 🦉 QWeb Templating Language🦉
 ## Content
 - [Overview](#overview)
 - [Directives](#directives)
 - [Reference](#reference)
  - [White Spaces](#white-spaces)
  - [Root Nodes](#root-nodes)
  - [Expression Evaluation](#expression-evaluation)
  - [Static html Nodes](#static-html-nodes)
  - [Outputting Data](#outputting-data)
  - [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)
 ## Overview
 [QWeb](https://www.odoo.com/documentation/13.0/reference/qweb.html) is the primary
 templating engine used by Odoo. It is based on the XML format, and used
 mostly to generate HTML. In OWL, QWeb templates are compiled into functions that
 generate a virtual dom representation of the HTML.
 ```xml
 <div>
    <span t-if="somecondition">Some string</span>
    <ul t-else="">
        <li t-foreach="messages" t-as="message">
            <t t-esc="message"/>
        </li>
    </ul>
 </div>
 ```
 Template directives are specified as XML attributes prefixed with `t-`, for
 instance `t-if` for conditionals, with elements and other attributes being
 rendered directly.
 To avoid element rendering, a placeholder element `<t>` is also available, which
 executes its directive but doesn’t generate any output in and of itself.
 We present in this section the templating language, including its Owl specific
 extensions.
 ## Directives
 For reference, here is a list of all standard QWeb directives:
 | Name                           | Description                                                    |
 | ------------------------------ | -------------------------------------------------------------- |
 | `t-esc`                        | [Outputting safely a value](#outputting-data)                  |
 | `t-raw`                        | [Outputting value, without escaping](#outputting-data)         |
 | `t-set`, `t-value`             | [Setting variables](#setting-variables)                        |
 | `t-if`, `t-elif`, `t-else`,    | [conditionally rendering](#conditionals)                       |
 | `t-foreach`, `t-as`            | [Loops](#loops)                                                |
 | `t-att`, `t-attf-*`, `t-att-*` | [Dynamic attributes](#dynamic-attributes)                      |
 | `t-call`                       | [Rendering sub templates](#rendering-sub-templates)            |
 | `t-debug`, `t-log`             | [Debugging](#debugging)                                        |
 | `t-translation`                | [Disabling the translation of a node](#translations)           |
 | `t-name`                       | [Defining a template (not really a directive)](qweb_engine.md) |
 The component system in Owl requires additional directives, to express various
 needs. Here is a list of all Owl specific directives:
 | Name                     | Description                                                                     |
 | ------------------------ | ------------------------------------------------------------------------------- |
 | `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-transition`           | [Defining an animation](animations.md#css-transitions)                          |
 | `t-slot`                 | [Rendering a slot](slots.md)                                                    |
 | `t-model`                | [Form input bindings](component.md#form-input-bindings)                         |
 | `t-tag`                  | [Rendering nodes with dynamic tag name](#dynamic-tag-names)                     |
 ## Reference
 ### White Spaces
 White spaces in a template are handled in a special way:
 - consecutive whitespaces are always condensed to a single whitespace
 - if a whitespace-only text node contains a linebreak, it is ignored
 - the previous rules do not apply if we are in a `<pre>` tag
 ### Root Nodes
 For many reasons, Owl QWeb templates should have a single root node. More
 precisely, the result of a template rendering should have a single root node:
 ```xml
 <!–– not ok: two root nodes ––>
 <t>
    <div>foo</div>
    <div>bar</div>
 </t>
 <!–– ok: result has one single root node ––>
 <t>
    <div t-if="someCondition">foo</div>
    <span t-else="">bar</span>
 </t>
 ```
 Extra root nodes will actually be ignored (even though they will be rendered
 in memory).
 Note: this does not apply to subtemplates (see the `t-call` directive). In that
 case, they will be inlined in the main template, and can actually have many
 root nodes.
 ### Expression Evaluation
 QWeb expressions are strings that will be processed at compile time. Each variable in
 the javascript expression will be replaced with a lookup in the context (so, the
 component). For example, `a + b.c(d)` will be converted into:
 ```js
 context["a"] + context["b"].c(context["d"]);
 ```
 It is useful to explain the various rules that apply on these expressions:
 1. it should be a simple expression which returns a value. It cannot be a statement.
   ```xml
   <div><p t-if="1 + 2 === 3">ok</p></div>
   ```
   is valid, but the following is not valid:
   ```xml
   <div><p t-if="console.log(1)">NOT valid</p></div>
   ```
 2. it can use anything in the rendering context (typically, the component):
   ```xml
   <p t-if="user.birthday === today()">Happy bithday!</p>
   ```
   is valid, and will read the `user` object from the context, and call the
   `today` function.
 3. it can use a few special operators to avoid using symbols such as `<`, `>`,
   `&` or `|`. This is useful to make sure that we still write valid XML.
   | Word  | replaced with |
   | ----- | ------------- |
   | `and` | `&&`          |
   | `or`  | `\|\|`        |
   | `gt`  | `>`           |
   | `gte` | `>=`          |
   | `lt`  | `<`           |
   | `lte` | `<=`          |
   So, one can write this:
   ```xml
   <div><p t-if="10 + 2 gt 5">ok</p></div>
   ```
 ### Static Html Nodes
 Normal, regular html nodes are rendered into themselves:
 ```xml
  <div>hello</div> <!–– rendered as itself ––>
 ```
 ### Outputting Data
 The `t-esc` directive is necessary whenever you want to add a dynamic text
 expression in a template. The text is escaped to avoid security issues.
 ```xml
 <p><t t-esc="value"/></p>
 ```
 rendered with the value `value` set to `42` in the rendering context yields:
 ```html
 <p>42</p>
 ```
 The `t-raw` directive is almost the same as `t-esc`, but without the escaping.
 This is mostly useful to inject a raw html string somewhere. Obviously, this
 is unsafe to do in general, and should only be used for strings known to be safe.
 ```xml
 <p><t t-raw="value"/></p>
 ```
 rendered with the value `value` set to `<span>foo</span>` in the rendering context yields:
 ```html
 <p><span>foo</span></p>
 ```
 Note that since the content of the expression is not known beforehand, the `t-raw`
 directive has to parse the html (and convert it to a virtual dom structure) for
 each rendering. So, it will be much slower than a regular template. It is
 therefore advised to limit the use of `t-raw` whenever possible.
 ### Setting Variables
 QWeb allows creating variables from within the template, to memoize a computation (to use it multiple times), give a piece of data a clearer name, ...
 This is done via the `t-set` directive, which takes the name of the variable to create. The value to set can be provided in two ways:
 1. a `t-value` attribute containing an expression, and the result of its
   evaluation will be set:
   ```xml
   <t t-set="foo" t-value="2 + 1"/>
   <t t-esc="foo"/>
   ```
   will print `3`. Note that the evaluation is done at rendering time, not at
   compilte time.
 2. if there is no `t-value` attribute, the node’s body is saved and its value is
   set as the variable’s value:
   ```xml
   <t t-set="foo">
       <li>ok</li>
   </t>
   <t t-esc="foo"/>
   ```
   will generate `&lt;li&gt;ok&lt;/li&gt;` (the content is escaped as we used the `t-esc` directive)
 The `t-set` directive acts like a regular variable in most programming language.
 It is lexically scoped (inner nodes are sub scopes), can be shadowed, ...
 ### Conditionals
 The `t-if` directive is useful to conditionally render something. It evaluates
 the expression given as attribute value, and then acts accordingly.
 ```xml
 <div>
    <t t-if="condition">
        <p>ok</p>
    </t>
 </div>
 ```
 The element is rendered if the condition (evaluated with the current rendering
 context) is true:
 ```xml
 <div>
    <p>ok</p>
 </div>
 ```
 but if the condition is false it is removed from the result:
 ```xml
 <div>
 </div>
 ```
 The conditional rendering applies to the bearer of the directive, which does not
 have to be `<t>`:
 ```xml
 <div>
    <p t-if="condition">ok</p>
 </div>
 ```
 will give the same results as the previous example.
 Extra conditional branching directives `t-elif` and `t-else` are also available:
 ```xml
 <div>
    <p t-if="user.birthday == today()">Happy bithday!</p>
    <p t-elif="user.login == 'root'">Welcome master!</p>
    <p t-else="">Welcome!</p>
 </div>
 ```
 ### Dynamic Attributes
 One can use the `t-att-` directive to add dynamic attributes. Its main use is to
 evaluate an expression (at rendering time) and bind an attribute to its result:
 For example, if we have `id` set to 32 in the rendering context,
 ```xml
 <div t-att-data-action-id="id"/> <!-- result: <div data-action-id="32"></div> -->
 ```
 If an expression evaluates to a falsy value, it will not be set at all:
 ```xml
 <div t-att-foo="false"/>  <!-- result: <div></div> -->
 ```
 It is sometimes convenient to format an attribute with string interpolation. In
 that case, the `t-attf-` directive can be used. It is useful when we need to mix
 literal and dynamic elements, such as css classes.
 ```xml
 <div t-attf-foo="a {{value1}} is {{value2}} of {{value3}} ]"/>
 <!-- result if values are set to 1,2 and 3: <div foo="a 0 is 1 of 2 ]"></div> -->
 ```
 If we need completely dynamic attribute names, then there is an additional
 directive: `t-att`, which takes either an object (with keys mapping to their
 values) or a pair `[key, value]`. For example:
 ```xml
 <div t-att="{'a': 1, 'b': 2}"/> <!-- result: <div a="1" b="2"></div> -->
 <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
 collection to iterate on, and a second parameter `t-as` providing the name to use
 for the current item of the iteration:
 ```xml
 <t t-foreach="[1, 2, 3]" t-as="i">
    <p><t t-esc="i"/></p>
 </t>
 ```
 will be rendered as:
 ```xml
 <p>1</p>
 <p>2</p>
 <p>3</p>
 ```
 Like conditions, `t-foreach` applies to the element bearing the directive’s attribute, and
 ```xml
 <p t-foreach="[1, 2, 3]" t-as="i">
    <t t-esc="i"/>
 </p>
 ```
 is equivalent to the previous example.
 `t-foreach` can iterate on an array (the current item will be the current value)
 or an object (the current item will be the current key).
 In addition to the name passed via t-as, `t-foreach` provides a few other
 variables for various data points (note: `$as` will be replaced with the name
 passed to `t-as`):
 - `$as_value`: the current iteration value, identical to `$as` for lists and
  integers, but for objects, it provides the value (where `$as` provides the key)
 - `$as_index`: the current iteration index (the first item of the iteration has index 0)
 - `$as_first`: whether the current item is the first of the iteration
  (equivalent to `$as_index == 0`)
 - `$as_last`: whether the current item is the last of the iteration
  (equivalent to `$as_index + 1 == $as_size`), requires the iteratee’s size be
  available
 These extra variables provided and all new variables created into the `t-foreach`
 are only available in the scope of the `t-foreach`. If the variable exists outside
 the context of the `t-foreach`, the value is copied at the end of the foreach
 into the global context.
 ```xml
 <t t-set="existing_variable" t-value="false"/>
 <!-- existing_variable now False -->
 <p t-foreach="Array(3)" t-as="i">
    <t t-set="existing_variable" t-value="true"/>
    <t t-set="new_variable" t-value="true"/>
    <!-- existing_variable and new_variable now true -->
 </p>
 <!-- existing_variable always true -->
 <!-- new_variable undefined -->
 ```
 Even though Owl tries to be as declarative as possible, the DOM does not fully
 expose its state declaratively in the DOM tree. For example, the scrolling state,
 the current user selection, the focused element or the state of an input are not
 set as attribute in the DOM tree. This is why we use a virtual dom
 algorithm to keep the actual DOM node as much as possible.
 However, in some situations, this is not enough, and we need to help Owl decide
 if an element is actually the same, or is a different element with the same
 properties.
 Consider the following situation: we have a list of two items `[{text: "a"}, {text: "b"}]`
 and we render them in this template:
 ```xml
 <p t-foreach="items" t-as="item"><t t-esc="item.text"/></p>
 ```
 The result will be two `<p>` tags with text `a` and `b`. Now, if we swap them,
 and rerender the template, Owl needs to know what the intent is:
 - should Owl actually swap the DOM nodes,
 - or should it keep the DOM nodes, but with an updated text content?
 This might look trivial, but it actually matters. These two possibilities lead
 to different results in some cases. For example, if the user selected the text
 of the first `p`, swapping them will keep the selection while updating the
 text content will not.
 There are many other cases where this is important: `input` tags with their
 value, css classes and animations, scroll position...
 So, the `t-key` directive is used to give an identity to an element. It allows
 Owl to understand if different elements of a list are actually different or not.
 The above example could be modified by adding an ID: `[{id: 1, text: "a"}, {id: 2, text: "b"}]`.
 Then, the template could look like this:
 ```xml
 <p t-foreach="items" t-as="item" t-key="item.id"><t t-esc="item.text"/></p>
 ```
 The `t-key` directive is useful for lists (`t-foreach`). A key should be
 a unique number or string (objects will not work: they will be cast to the
 `"[object Object]"` string, which is obviously not unique).
 Also, the key can be set on a `t` tag or on its children. The following variations
 are all equivalent:
 ```xml
 <p t-foreach="items" t-as="item" t-key="item.id">
  <t t-esc="item.text"/>
 </p>
 <t t-foreach="items" t-as="item" t-key="item.id">
  <p t-esc="item.text"/>
 </t>
 <t t-foreach="items" t-as="item">
  <p t-key="item.id" t-esc="item.text"/>
 </t>
 ```
 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
 from within another template (to avoid duplication or give names to parts of
 templates), using the `t-call` directive:
 ```xml
 <div t-name="other-template">
    <p><t t-value="var"/></p>
 </div>
 <div t-name="main-template">
    <t t-set="var" t-value="owl"/>
    <t t-call="other-template"/>
 </div>
 ```
 will be rendered as `<div><p>owl</p></div>`. This example shows that the sub
 template is rendered with the execution context of the parent. The sub template
 is actually inlined in the main template, but in a sub scope: variables defined
 in the sub template do not escape.
 Sometimes, one might want to pass information to the sub template. In that case,
 the content of the body of the `t-call` directive is available as a special
 magic variable `0`:
 ```xml
 <t t-name="other-template">
    This template was called with content:
    <t t-raw="0"/>
 </t>
 <div t-name="main-template">
    <t t-call="other-template">
        <em>content</em>
    </t>
 </div>
 ```
 will result in :
 ```xml
 <div>
    This template was called with content:
    <em>content</em>
 </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
 is not wanted, there is a `t-translation` directive which can turn off
 translations (if it is set to the `off` value), with the following rules:
 - each text node will be replaced with its translation,
 - each of the following attribute values will be translated as well: `title`,
  `placeholder`, `label` and `alt`,
 - translating text nodes can be disabled with the special attribute `t-translation`,
  if its value is `off`.
 See [here](qweb_engine.md#translations) for more information on how to setup a
 translate function in Owl QWeb.
 ### Debugging
 The javascript QWeb implementation provides two useful debugging directives:
 `t-debug` adds a debugger statement during template rendering:
 ```xml
 <t t-if="a_test">
    <t t-debug=""/>
 </t>
 ```
 will stop execution if the browser dev tools are open.
 `t-log` takes an expression parameter, evaluates the expression during rendering and logs its result with console.log:
 ```xml
 <t t-set="foo" t-value="42"/>
 <t t-log="foo"/>
 ```
 will print 42 to the console.
@@ -0,0 +1,111 @@
 # 🦉 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 +1,184 @@
 # 🦉 Tags 🦉
 ## Content
 - [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
 or styles. There are currently two tags: `css` and `xml`. With these functions,
 it is possible to write [single file components](../learning/how_to_write_sfc.md).
 ## XML tag
 The `xml` tag is certainly the most useful tag. It is used to define an inline
 QWeb template for a component. Without tags, creating a standalone component
 would look like this:
 ```js
 import { Component } from 'owl'
 const name = 'some-unique-name';
 const template = `
    <div>
        <span t-if="somecondition">text</span>
        <button t-on-click="someMethod">Click</button>
    </div>
 `;
 QWeb.registerTemplate(name, template);
 class MyComponent extends Component {
    static template = name;
    ...
 }
 ```
 With tags, this process is slightly simplified. The name is uniquely generated,
 and the template is automatically registered:
 ```js
 const { Component } = owl;
 const { xml } = owl.tags;
 class MyComponent extends Component {
    static template = xml`
        <div>
            <span t-if="somecondition">text</span>
            <button t-on-click="someMethod">Click</button>
        </div>
    `;
    ...
 }
 ```
 ## 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;
    }
  `;
 }
 ```
@@ -0,0 +1,148 @@
 # 🦉 Utils 🦉
 Owl export a few useful utility functions, to help with common issues. Those
 functions are all available in the `owl.utils` namespace.
 ## Content
 - [`whenReady`](#whenready): executing code when DOM is ready
 - [`loadJS`](#loadjs): loading script files
 - [`loadFile`](#loadfile): loading a file (useful for templates)
 - [`escape`](#escape): sanitizing strings
 - [`debounce`](#debounce): limiting rate of function calls
 - [`shallowEqual`](#shallowequal): shallow object comparison
 ## `whenReady`
 The function `whenReady` returns a `Promise` resolved when the DOM is ready (if
 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]) {
  const qweb = new owl.QWeb({ templates });
  const env = { qweb };
  await mount(App, { env, target: document.body });
 });
 ```
 or alternatively:
 ```js
 owl.utils.whenReady(function () {
  const qweb = new owl.QWeb();
  const env = { qweb };
  await mount(App, { env, target: document.body });
 });
 ```
 ## `loadJS`
 `loadJS` takes a url (string) for a javascript resource, and loads it (by adding
 a script tag in the document head). It returns a promise, so the caller can
 properly reacts when it is ready. Also, it is smart: it maintains a list of urls
 previously loaded (or currently being loaded), and prevent doing twice the work.
 For example, it is useful for lazy loading external libraries:
 ```js
 class MyComponent extends owl.Component {
  willStart() {
    return owl.utils.loadJS("/static/libs/someLib.js");
  }
 }
 ```
 ## `loadFile`
 `loadFile` is a helper function to fetch a file. It simply
 performs a `GET` request and returns the resulting string in a promise. The
 initial usecase for this function is to load a template file. For example:
 ```js
 async function makeEnv() {
  const templates = await owl.utils.loadFile("templates.xml");
  const qweb = new owl.QWeb({ templates });
  return { qweb };
 }
 ```
 Note that unlike `loadJS`, this function returns the content of the file as a
 string. It does not add a `script` tag or any other side effect.
 ## `escape`
 Sometimes, we need to display dynamic data (for example user-generated data) in
 the user interface. If this is done by a `QWeb` template, it is not an issue:
 ```xml
    <div><t t-esc="user.data"/></div>
 ```
 The `QWeb` engine will create a `div` node and add the content of the `user.data`
 string as a text node, so the web browser will not parse it as html. However,
 it may be a problem if this is done with some javascript code like this:
 ```js
 class BadComponent extends Component {
  // some template with a ref to a div
  // some code ...
  mounted() {
    this.divRef.el.innerHTML = this.state.value;
  }
 }
 ```
 In this case, the content of the `div` will be parsed as html, which may inject
 unwanted behaviour. To fix this, the `escape` function will simply transform a
 string into an escaped version of the same string, which will be properly displayed
 by the browser, but which will not be parsed as html (for example, `"<ok>"` is
 escaped to the string: `"&lt;ok&gt;"`). So, the bad example above can be fixed
 with the following change:
 ```js
 this.divRef.el.innerHTML = owl.utils.escape(this.state.value);
 ```
 ## `debounce`
 The `debounce` function is useful when we want to limit the number of times some
 function/action is perfomed. For example, this may be useful to prevent issue
 with people double clicking on a button.
 It takes three arguments:
 - `func` (function): this is the function that will be rate limited
 - `wait` (number): this is the number of milliseconds that we want to use to
  rate limit the function `func`
 - `immediate` (optional, boolean, default=false): if `immediate` is true, the
  function will be triggered immediately (leading edge of the interval). If false,
  the function will be triggered at the end (trailing edge).
 It returns a function. For example:
 ```js
 const debounce = owl.utils.debounce;
 window.addEventListener("mousemove", debounce(doSomething, 100));
 ```
 As this example shows, it is usualy useful for event handlers which are triggered
 very quickly, such as `scroll` or `mousemove` events.
 ## `shallowEqual`
 This function checks if two objects have the same values assigned to each keys:
 ```js
 shallowEqual({ a: 1, b: 2 }, { a: 1, b: 2 }); // true
 shallowEqual({ a: 1, b: 2 }, { a: 1, b: 3 }); // false
 ```
 However, for performance reasons, it assumes that the two objects have the same
 keys. If we are in a situation where this is not guaranteed, the following code
 will work:
 ```js
 const completeShallowEqual = (a, b) => shallowEqual(a, b) && shallowEqual(b, a);
 ```
@@ -1,149 +0,0 @@
 # 🦉 Store 🦉
 ## Content
 - [Overview](#overview)
 - [Example](#example)
 - [Reference](#reference)
  - [Public API](#public-api)
  - [Mutations](#mutations)
  - [Actions](#actions)
  - [Getters](#getters)
  - [Connecting a component](#connecting-a-component)
 ## 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 part 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 state, and let the developer update it in a structured way (through
 mutations and actions). Owl components can then connect to the store, and will
 be updated if necessary.
 Note: Owl's store is inspired by React Redux and VueX.
 ## Example
 Here is what a simple store look like:
 ```js
 const actions = {
    addTodo({commit}, message) {
        commit('addTodo', message);
    }
 };
 const mutations = {
    addTodo({state}, message) {
        const todo = {
            id: state.nextId++,
            message,
            isCompleted: false,
        };
        state.todos.push(todo);
    },
 };
 const state = {
    todos: [],
    nextId: 1,
 };
 const store = new owl.Store({state, actions, mutations});
 store.on('update', () => console.log(store.state));
 // updating the state
 store.dispatch('addTodo', 'fix all bugs');
 ```
 ## Reference
 The store is a simple `owl.EventBus` 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 a `owl.Observer`),
 which is the reason why it is able to know if it was changed.  This implies that
 state changes need to be done carefully in some cases (adding a new key to an
 object, or modifying an array with the `arr[i] = newValue` syntax).  See the
 [Observer](observer.md)'s documentation for more details.
 ### Public API
 1. `constructor`
 2. `commit`
 3. `dispatch`
 ### Mutations
 Mutations are the only way to modify the state.  Changing the state outside a
 mutation is not allowed (and should throw an error).  Mutations are synchronous.
 ### Actions
 Actions are used to coordinate state changes.  It is also useful whenever some
 asynchronous logic is necessary.  For example, fetching data should be done
 in an action.
 ```js
 const actions = {
    async login({commit}) {
        commit('setLoginState', 'pending');
        try {
            const loginInfo = await doSomeRPC('/login/', 'someinfo');
            commit('setLoginState', loginInfo);
        } catch {
            commit('setLoginState', 'error');
        }
    }
 };
 ```
 ### 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);
 ```
 ### Connecting a component
 Todo
@@ -1,41 +0,0 @@
 # 🦉 Utils 🦉
 Owl export a few useful utility functions, to help with common issues. Those
 functions are all available in the `owl.utils` namespace.
 ## Content
 - [`whenReady`](#whenready)
 - [`loadJS`](#loadjs)
 - [`loadTemplates`](#loadtemplates)
 - [`escape`](#escape)
 - [`debounce`](#debounce)
 - [`patch` and `unpatch`](#patchandunpatch)
 ## `whenReady`
 The function `whenReady` is useful to register some code that need to be executed
 as soon as the document (page) is ready:
 ```js
 owl.utils.whenReady(function () {
    const qweb = new owl.QWeb();
    const app = new App({ qweb });
    app.mount(document.body);
 });
 ```
 ## `loadJS`
 ## `loadTemplates`
 ## `escape`
 ## `debounce`
 ## `patch` and `unpatch`
@@ -1,3 +0,0 @@
 # 🦉 VDom 🦉
 Owl's virtual dom is a fork of [snabbdom](https://github.com/snabbdom/snabbdom).
@@ -1,218 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 odoo.define("app", function(require) {
  const Widget = require("web.Widget");
  var core = require("web.core");
  var dom = require("web.dom");
  //----------------------------------------------------------------------------
  // Likes Counter Widget
  //----------------------------------------------------------------------------
  var Counter = Widget.extend({
    template: "counter",
    events: {
      "click .o_increment": "_onIncrement"
    },
    init: function(parent) {
      this._super(parent);
      this.value = 0;
    },
    start: function() {
      this.updateCounter();
    },
    on_attach_callback: function() {},
    on_detach_callback: function() {},
    updateCounter: function() {
      this.$(".o_increment").html("Value: " + this.value);
    },
    _onIncrement: function(ev) {
      ev.stopPropagation();
      this.value += 1;
      this.updateCounter();
    }
  });
  //----------------------------------------------------------------------------
  // Message Widget
  //----------------------------------------------------------------------------
  var Message = Widget.extend({
    template: "message",
    events: {
      "click .remove": "_onRemove"
    },
    init: function(parent, message) {
      this._super(parent);
      this.author = message.author;
      this.msg = message.msg;
      this.id = message.id;
    },
    willStart: function() {
      this.counter = new Counter(this);
      return this.counter.appendTo($("<div>"));
    },
    start: function() {
      this.$msg = this.$(".msg");
      dom.append(this.$el, this.counter.$el, {
        in_DOM: this.isInDom,
        callbacks: [{ widget: this.counter }]
      });
    },
    on_attach_callback: function() {
      this.isInDom = true;
      if (this.counter) {
        this.counter.on_attach_callback();
      }
    },
    on_detach_callback: function() {
      this.isInDom = true;
      if (this.counter) {
        this.counter.on_detach_callback();
      }
    },
    _onRemove: function() {
      this.trigger_up("remove_message", { id: this.id });
    },
    update: function() {
      this.msg += "!!!";
      this.$msg.text(this.msg);
    }
  });
  //----------------------------------------------------------------------------
  // Root Widget
  //----------------------------------------------------------------------------
  var App = Widget.extend({
    template: "root",
    events: {
      "click .o_btn_msg.100": function() {
        this.addMessages(100);
      },
      "click .o_btn_msg.1000": function() {
        this.addMessages(1000);
      },
      "click .o_btn_msg.10000": function() {
        this.addMessages(10000);
      },
      "click .o_btn_msg.50000": function() {
        this.addMessages(50000);
      },
      "click .updateSomeMessages": function() {
        this.updateSomeMessages();
      },
      "click .clear": function() {
        this.clear();
      }
    },
    custom_events: {
      remove_message: "_onRemoveMessage"
    },
    init: function(parent) {
      this._super(parent);
      this.widgets = {};
      this.isInDom = false;
      this.messageCount = 0;
    },
    start: function() {
      this.$content = this.$(".content");
      this.$msgCount = this.$(".message_count");
    },
    on_attach_callback: function() {
      this.isInDom = true;
      for (let widget of Object.values(this.widgets)) {
        if (widget.on_attach_callback) {
          widget.on_attach_callback();
        }
      }
    },
    on_detach_callback: function() {
      this.isInDom = true;
      for (let widget of Object.values(this.widgets)) {
        if (widget.on_detach_callback) {
          widget.on_detach_callback();
        }
      }
    },
    updateMessageCount() {
      this.$msgCount.text("Number of msg: " + this.messageCount);
    },
    addMessages: function(n) {
      var self = this;
      startMeasure("add " + n);
      const defs = [];
      const messages = buildData(n);
      for (let message of messages) {
        const widget = new Message(this, message);
        this.widgets[message.id] = widget;
        defs.push(widget.appendTo("<div>"));
      }
      $.when
        .apply($, defs)
        .then(function() {
          for (let message of messages) {
            let widget = self.widgets[message.id];
            dom.append(self.$content, widget.$el, {
              in_DOM: this.isInDom,
              callbacks: [{ widget: widget }]
            });
          }
        })
        .then(function() {
          self.messageCount += n;
          self.updateMessageCount();
          stopMeasure();
        });
    },
    clear: function() {
      startMeasure("clear");
      this.$content.empty();
      for (let key in this.widgets) {
        this.widgets[key].destroy();
        delete this.widgets[key];
      }
      this.messageCount = 0;
      this.updateMessageCount();
      stopMeasure();
    },
    updateSomeMessages: function() {
      startMeasure("update every 10th");
      const widgets = Object.values(this.widgets);
      for (let i = 0; i < widgets.length; i += 10) {
        widgets[i].update();
      }
      stopMeasure();
    },
    _onRemoveMessage: function(ev) {
      startMeasure("remove message");
      ev.target.destroy();
      delete this.widgets[ev.data.id];
      this.messageCount--;
      this.updateMessageCount();
      stopMeasure();
    }
  });
  //------------------------------------------------------------------------------
  // Application initialization
  //------------------------------------------------------------------------------
  async function start() {
    // prepare QWeb
    const templates = await fetch("templates.xml");
    let strTemplates = await templates.text();
    strTemplates = strTemplates.replace(/<!--[\s\S]*?-->/g, "");
    core.qweb.add_template(strTemplates);
    // prepare app
    const app = new App();
    await app.appendTo(document.body);
  }
  start();
 });
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>Odoo Widget Benchmark (12.0)</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='web.assets_common.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,30 +0,0 @@
 <templates>
    <div class="main" t-name="root">
        <div class="left-thing">
            <div class="message_count">
                Number of msg: 0
            </div>
            <button class="o_btn_msg 100">Add 100 messages</button>
            <button class="o_btn_msg 1000">Add 1000 messages</button>
            <button class="o_btn_msg 10000">Add 10000 messages</button>
            <button class="o_btn_msg 50000">Add 50000 messages</button>
            <button class="updateSomeMessages">Update every 10th message</button>
            <button class="clear">Clear</button>
        </div>
        <div class="right-thing">
            <div class="content">
            </div>
        </div>
    </div>
    <div t-name="message" class="message">
        <span class="author"><t t-esc="widget.author"/></span>
        <span class="msg"><t t-esc="widget.msg"/></span>
        <button class="remove" >Remove</button>
    </div>
  <div t-name="counter">
    <button class="o_increment"></button>
  </div>
 </templates>
@@ -1,218 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 odoo.define("app", function(require) {
  const Widget = require("web.Widget");
  var core = require("web.core");
  var dom = require("web.dom");
  //----------------------------------------------------------------------------
  // Likes Counter Widget
  //----------------------------------------------------------------------------
  var Counter = Widget.extend({
    template: "counter",
    events: {
      "click .o_increment": "_onIncrement"
    },
    init: function(parent) {
      this._super(parent);
      this.value = 0;
    },
    start: function() {
      this.updateCounter();
    },
    on_attach_callback: function() {},
    on_detach_callback: function() {},
    updateCounter: function() {
      this.$(".o_increment").html("Value: " + this.value);
    },
    _onIncrement: function(ev) {
      ev.stopPropagation();
      this.value += 1;
      this.updateCounter();
    }
  });
  //----------------------------------------------------------------------------
  // Message Widget
  //----------------------------------------------------------------------------
  var Message = Widget.extend({
    template: "message",
    events: {
      "click .remove": "_onRemove"
    },
    init: function(parent, message) {
      this._super(parent);
      this.author = message.author;
      this.msg = message.msg;
      this.id = message.id;
    },
    willStart: function() {
      this.counter = new Counter(this);
      return this.counter.appendTo($("<div>"));
    },
    start: function() {
      this.$msg = this.$(".msg");
      dom.append(this.$el, this.counter.$el, {
        in_DOM: this.isInDom,
        callbacks: [{ widget: this.counter }]
      });
    },
    on_attach_callback: function() {
      this.isInDom = true;
      if (this.counter) {
        this.counter.on_attach_callback();
      }
    },
    on_detach_callback: function() {
      this.isInDom = true;
      if (this.counter) {
        this.counter.on_detach_callback();
      }
    },
    _onRemove: function() {
      this.trigger_up("remove_message", { id: this.id });
    },
    update: function() {
      this.msg += "!!!";
      this.$msg.text(this.msg);
    }
  });
  //----------------------------------------------------------------------------
  // Root Widget
  //----------------------------------------------------------------------------
  var App = Widget.extend({
    template: "root",
    events: {
      "click .o_btn_msg.100": function() {
        this.addMessages(100);
      },
      "click .o_btn_msg.1000": function() {
        this.addMessages(1000);
      },
      "click .o_btn_msg.10000": function() {
        this.addMessages(10000);
      },
      "click .o_btn_msg.50000": function() {
        this.addMessages(50000);
      },
      "click .updateSomeMessages": function() {
        this.updateSomeMessages();
      },
      "click .clear": function() {
        this.clear();
      }
    },
    custom_events: {
      remove_message: "_onRemoveMessage"
    },
    init: function(parent) {
      this._super(parent);
      this.widgets = {};
      this.isInDom = false;
      this.messageCount = 0;
    },
    start: function() {
      this.$content = this.$(".content");
      this.$msgCount = this.$(".message_count");
    },
    on_attach_callback: function() {
      this.isInDom = true;
      for (let widget of Object.values(this.widgets)) {
        if (widget.on_attach_callback) {
          widget.on_attach_callback();
        }
      }
    },
    on_detach_callback: function() {
      this.isInDom = true;
      for (let widget of Object.values(this.widgets)) {
        if (widget.on_detach_callback) {
          widget.on_detach_callback();
        }
      }
    },
    updateMessageCount() {
      this.$msgCount.text("Number of msg: " + this.messageCount);
    },
    addMessages: function(n) {
      var self = this;
      startMeasure("add " + n);
      const defs = [];
      const messages = buildData(n);
      for (let message of messages) {
        const widget = new Message(this, message);
        this.widgets[message.id] = widget;
        defs.push(widget.appendTo("<div>"));
      }
      $.when
        .apply($, defs)
        .then(function() {
          for (let message of messages) {
            let widget = self.widgets[message.id];
            dom.append(self.$content, widget.$el, {
              in_DOM: this.isInDom,
              callbacks: [{ widget: widget }]
            });
          }
        })
        .then(function() {
          self.messageCount += n;
          self.updateMessageCount();
          stopMeasure();
        });
    },
    clear: function() {
      startMeasure("clear");
      this.$content.empty();
      for (let key in this.widgets) {
        this.widgets[key].destroy();
        delete this.widgets[key];
      }
      this.messageCount = 0;
      this.updateMessageCount();
      stopMeasure();
    },
    updateSomeMessages: function() {
      startMeasure("update every 10th");
      const widgets = Object.values(this.widgets);
      for (let i = 0; i < widgets.length; i += 10) {
        widgets[i].update();
      }
      stopMeasure();
    },
    _onRemoveMessage: function(ev) {
      startMeasure("remove message");
      ev.target.destroy();
      delete this.widgets[ev.data.id];
      this.messageCount--;
      this.updateMessageCount();
      stopMeasure();
    }
  });
  //------------------------------------------------------------------------------
  // Application initialization
  //------------------------------------------------------------------------------
  async function start() {
    // prepare QWeb
    const templates = await fetch("templates.xml");
    let strTemplates = await templates.text();
    strTemplates = strTemplates.replace(/<!--[\s\S]*?-->/g, "");
    core.qweb.add_template(strTemplates);
    // prepare app
    const app = new App();
    await app.appendTo(document.body);
  }
  start();
 });
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>Odoo Widget Benchmark (12.3)</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='web.assets_common.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,30 +0,0 @@
 <templates>
    <div class="main" t-name="root">
        <div class="left-thing">
            <div class="message_count">
                Number of msg: 0
            </div>
            <button class="o_btn_msg 100">Add 100 messages</button>
            <button class="o_btn_msg 1000">Add 1000 messages</button>
            <button class="o_btn_msg 10000">Add 10000 messages</button>
            <button class="o_btn_msg 50000">Add 50000 messages</button>
            <button class="updateSomeMessages">Update every 10th message</button>
            <button class="clear">Clear</button>
        </div>
        <div class="right-thing">
            <div class="content">
            </div>
        </div>
    </div>
    <div t-name="message" class="message">
        <span class="author"><t t-esc="widget.author"/></span>
        <span class="msg"><t t-esc="widget.msg"/></span>
        <button class="remove" >Remove</button>
    </div>
  <div t-name="counter">
    <button class="o_increment"></button>
  </div>
 </templates>
@@ -1,84 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Likes Counter Widget
 //------------------------------------------------------------------------------
 class Counter extends owl.Component {
  template = "counter";
  state = { counter: 0 };
  increment() {
    this.state.counter++;
  }
 }
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 class Message extends owl.Component {
  template = "message";
  widgets = { Counter };
  shouldUpdate(nextProps) {
    return nextProps !== this.props;
  }
  removeMessage() {
    this.trigger("remove_message", {
      id: this.props.id
    });
  }
 }
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 class App extends owl.Component {
  template = "root";
  widgets = { Message };
  state = { messages: [] };
  addMessages(n) {
    startMeasure("add " + n);
    const newMessages = buildData(n);
    this.state.messages.push.apply(this.state.messages, newMessages);
    stopMeasure();
  }
  clear() {
    startMeasure("clear");
    this.state.messages = [];
    stopMeasure();
  }
  updateSomeMessages() {
    startMeasure("update every 10th");
    const messages = this.state.messages;
    for (let i = 0; i < this.state.messages.length; i += 10) {
      const msg = Object.assign({}, messages[i]);
      msg.author += '!!!';
      this.set(messages, i, msg);
    }
    stopMeasure();
  }
  removeMessage(data) {
    startMeasure("remove message");
    const index = this.state.messages.findIndex(m => m.id === data.id);
    this.state.messages.splice(index, 1);
    stopMeasure();
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 async function start() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const env = {
    qweb: new owl.QWeb(templates)
  };
  const app = new App(env);
  app.mount(document.body);
 }
 start();
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>OWL 0.10.0 Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='owl.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,32 +0,0 @@
 <templates>
  <div t-name="root" class="main">
      <div class="left-thing">
          <div>Number of msg: <t t-esc="state.messages.length"/></div>
          <button t-on-click="addMessages(100)">Add 100 messages</button>
          <button t-on-click="addMessages(1000)">Add 1000 messages</button>
          <button t-on-click="addMessages(10000)">Add 10000 messages</button>
          <button t-on-click="addMessages(50000)">Add 50000 messages</button>
          <button t-on-click="updateSomeMessages">Update every 10th message</button>
          <button t-on-click="clear">Clear</button>
      </div>
      <div class="right-thing">
          <div class="content">
              <t t-foreach="state.messages" t-as="message">
                  <t t-widget="Message" t-key="message.id" t-props="message" t-on-remove_message="removeMessage"/>
              </t>
          </div>
      </div>
  </div>
  <div t-name="message" class="message">
    <span class="author"><t t-esc="props.author"/></span>
    <span class="msg"><t t-esc="props.msg"/></span>
    <button class="remove" t-on-click="removeMessage">Remove</button>
    <t t-widget="Counter"/>
  </div>
  <div t-name="counter">
    <button t-on-click="increment">Value: <t t-esc="state.counter"/></button>
  </div>
 </templates>
@@ -1,85 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Likes Counter Widget
 //------------------------------------------------------------------------------
 class Counter extends owl.Component {
  template = "counter";
  state = { counter: 0 };
  increment() {
    this.state.counter++;
  }
 }
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 class Message extends owl.Component {
  template = "message";
  widgets = { Counter };
  shouldUpdate(nextProps) {
    return nextProps !== this.props;
  }
  removeMessage() {
    this.trigger("remove_message", {
      id: this.props.id
    });
  }
 }
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 class App extends owl.Component {
  template = "root";
  widgets = { Message };
  state = { messages: [] };
  addMessages(n) {
    startMeasure("add " + n);
    const newMessages = buildData(n);
    this.state.messages.push.apply(this.state.messages, newMessages);
    stopMeasure();
  }
  clear() {
    startMeasure("clear");
    this.state.messages = [];
    stopMeasure();
  }
  updateSomeMessages() {
    startMeasure("update every 10th");
    const messages = this.state.messages;
    for (let i = 0; i < this.state.messages.length; i += 10) {
      const msg = Object.assign({}, messages[i]);
      msg.author += '!!!';
      this.set(messages, i, msg);
    }
    stopMeasure();
  }
  removeMessage(data) {
    startMeasure('remove message');
    const index = this.state.messages.findIndex(m => m.id === data.id);
    this.state.messages.splice(index, 1);
    stopMeasure();
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 async function start() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const env = {
    qweb: new owl.QWeb(templates)
  };
  const app = new App(env);
  app.mount(document.body);
 }
 start();
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>OWL 0.7.0 Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='owl.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,32 +0,0 @@
 <templates>
  <div t-name="root" class="main">
      <div class="left-thing">
          <div>Number of msg: <t t-esc="state.messages.length"/></div>
          <button t-on-click="addMessages(100)">Add 100 messages</button>
          <button t-on-click="addMessages(1000)">Add 1000 messages</button>
          <button t-on-click="addMessages(10000)">Add 10000 messages</button>
          <button t-on-click="addMessages(50000)">Add 50000 messages</button>
          <button t-on-click="updateSomeMessages">Update every 10th message</button>
          <button t-on-click="clear">Clear</button>
      </div>
      <div class="right-thing">
          <div class="content">
              <t t-foreach="state.messages" t-as="message">
                  <t t-widget="Message" t-key="message.id" t-props="message" t-on-remove_message="removeMessage"/>
              </t>
          </div>
      </div>
  </div>
  <div t-name="message" class="message">
    <span class="author"><t t-esc="props.author"/></span>
    <span class="msg"><t t-esc="props.msg"/></span>
    <button class="remove" t-on-click="removeMessage">Remove</button>
    <t t-widget="Counter"/>
  </div>
  <div t-name="counter">
    <button t-on-click="increment">Value: <t t-esc="state.counter"/></button>
  </div>
 </templates>
@@ -1,84 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Likes Counter Widget
 //------------------------------------------------------------------------------
 class Counter extends owl.Component {
  template = "counter";
  state = { counter: 0 };
  increment() {
    this.state.counter++;
  }
 }
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 class Message extends owl.Component {
  template = "message";
  widgets = { Counter };
  shouldUpdate(nextProps) {
    return nextProps !== this.props;
  }
  removeMessage() {
    this.trigger("remove_message", {
      id: this.props.id
    });
  }
 }
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 class App extends owl.Component {
  template = "root";
  widgets = { Message };
  state = { messages: [] };
  addMessages(n) {
    startMeasure("add " + n);
    const newMessages = buildData(n);
    this.state.messages.push.apply(this.state.messages, newMessages);
    stopMeasure();
  }
  clear() {
    startMeasure("clear");
    this.state.messages = [];
    stopMeasure();
  }
  updateSomeMessages() {
    startMeasure("update every 10th");
    const messages = this.state.messages;
    for (let i = 0; i < this.state.messages.length; i += 10) {
      const msg = Object.assign({}, messages[i]);
      msg.author += '!!!';
      this.set(messages, i, msg);
    }
    stopMeasure();
  }
  removeMessage(data) {
    startMeasure("remove message");
    const index = this.state.messages.findIndex(m => m.id === data.id);
    this.state.messages.splice(index, 1);
    stopMeasure();
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 async function start() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const env = {
    qweb: new owl.QWeb(templates)
  };
  const app = new App(env);
  app.mount(document.body);
 }
 start();
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>OWL 0.8.0 Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='owl-0.8.0.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,32 +0,0 @@
 <templates>
  <div t-name="root" class="main">
      <div class="left-thing">
          <div>Number of msg: <t t-esc="state.messages.length"/></div>
          <button t-on-click="addMessages(100)">Add 100 messages</button>
          <button t-on-click="addMessages(1000)">Add 1000 messages</button>
          <button t-on-click="addMessages(10000)">Add 10000 messages</button>
          <button t-on-click="addMessages(50000)">Add 50000 messages</button>
          <button t-on-click="updateSomeMessages">Update every 10th message</button>
          <button t-on-click="clear">Clear</button>
      </div>
      <div class="right-thing">
          <div class="content">
              <t t-foreach="state.messages" t-as="message">
                  <t t-widget="Message" t-key="message.id" t-props="message" t-on-remove_message="removeMessage"/>
              </t>
          </div>
      </div>
  </div>
  <div t-name="message" class="message">
    <span class="author"><t t-esc="props.author"/></span>
    <span class="msg"><t t-esc="props.msg"/></span>
    <button class="remove" t-on-click="removeMessage">Remove</button>
    <t t-widget="Counter"/>
  </div>
  <div t-name="counter">
    <button t-on-click="increment">Value: <t t-esc="state.counter"/></button>
  </div>
 </templates>
@@ -1,84 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Likes Counter Widget
 //------------------------------------------------------------------------------
 class Counter extends owl.Component {
  template = "counter";
  state = { counter: 0 };
  increment() {
    this.state.counter++;
  }
 }
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 class Message extends owl.Component {
  template = "message";
  widgets = { Counter };
  shouldUpdate(nextProps) {
    return nextProps !== this.props;
  }
  removeMessage() {
    this.trigger("remove_message", {
      id: this.props.id
    });
  }
 }
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 class App extends owl.Component {
  template = "root";
  widgets = { Message };
  state = { messages: [] };
  addMessages(n) {
    startMeasure("add " + n);
    const newMessages = buildData(n);
    this.state.messages.push.apply(this.state.messages, newMessages);
    stopMeasure();
  }
  clear() {
    startMeasure("clear");
    this.state.messages = [];
    stopMeasure();
  }
  updateSomeMessages() {
    startMeasure("update every 10th");
    const messages = this.state.messages;
    for (let i = 0; i < this.state.messages.length; i += 10) {
      const msg = Object.assign({}, messages[i]);
      msg.author += '!!!';
      this.set(messages, i, msg);
    }
    stopMeasure();
  }
  removeMessage(data) {
    startMeasure("remove message");
    const index = this.state.messages.findIndex(m => m.id === data.id);
    this.state.messages.splice(index, 1);
    stopMeasure();
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 async function start() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const env = {
    qweb: new owl.QWeb(templates)
  };
  const app = new App(env);
  app.mount(document.body);
 }
 start();
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>OWL 0.9.0 Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='owl.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,32 +0,0 @@
 <templates>
  <div t-name="root" class="main">
      <div class="left-thing">
          <div>Number of msg: <t t-esc="state.messages.length"/></div>
          <button t-on-click="addMessages(100)">Add 100 messages</button>
          <button t-on-click="addMessages(1000)">Add 1000 messages</button>
          <button t-on-click="addMessages(10000)">Add 10000 messages</button>
          <button t-on-click="addMessages(50000)">Add 50000 messages</button>
          <button t-on-click="updateSomeMessages">Update every 10th message</button>
          <button t-on-click="clear">Clear</button>
      </div>
      <div class="right-thing">
          <div class="content">
              <t t-foreach="state.messages" t-as="message">
                  <t t-widget="Message" t-key="message.id" t-props="message" t-on-remove_message="removeMessage"/>
              </t>
          </div>
      </div>
  </div>
  <div t-name="message" class="message">
    <span class="author"><t t-esc="props.author"/></span>
    <span class="msg"><t t-esc="props.msg"/></span>
    <button class="remove" t-on-click="removeMessage">Remove</button>
    <t t-widget="Counter"/>
  </div>
  <div t-name="counter">
    <button t-on-click="increment">Value: <t t-esc="state.counter"/></button>
  </div>
 </templates>
@@ -1,81 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Likes Counter Widget
 //------------------------------------------------------------------------------
 class Counter extends owl.Component {
  state = { counter: 0 };
  increment() {
    this.state.counter++;
  }
 }
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 class Message extends owl.Component {
  widgets = { Counter };
  shouldUpdate(nextProps) {
    return nextProps !== this.props;
  }
  removeMessage() {
    this.trigger("remove_message", {
      id: this.props.id
    });
  }
 }
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 class App extends owl.Component {
  widgets = { Message };
  state = { messages: [] };
  addMessages(n) {
    startMeasure("add " + n);
    const newMessages = buildData(n);
    this.state.messages.push.apply(this.state.messages, newMessages);
    stopMeasure();
  }
  clear() {
    startMeasure("clear");
    this.state.messages = [];
    stopMeasure();
  }
  updateSomeMessages() {
    startMeasure("update every 10th");
    const messages = this.state.messages;
    for (let i = 0; i < this.state.messages.length; i += 10) {
      const msg = Object.assign({}, messages[i]);
      msg.author += '!!!';
      this.set(messages, i, msg);
    }
    stopMeasure();
  }
  removeMessage(data) {
    startMeasure("remove message");
    const index = this.state.messages.findIndex(m => m.id === data.id);
    this.state.messages.splice(index, 1);
    stopMeasure();
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 async function start() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const env = {
    qweb: new owl.QWeb(templates)
  };
  const app = new App(env);
  app.mount(document.body);
 }
 start();
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>OWL Master Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='../../owl.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,32 +0,0 @@
 <templates>
  <div t-name="App" class="main">
      <div class="left-thing">
          <div>Number of msg: <t t-esc="state.messages.length"/></div>
          <button t-on-click="addMessages(100)">Add 100 messages</button>
          <button t-on-click="addMessages(1000)">Add 1000 messages</button>
          <button t-on-click="addMessages(10000)">Add 10000 messages</button>
          <button t-on-click="addMessages(50000)">Add 50000 messages</button>
          <button t-on-click="updateSomeMessages">Update every 10th message</button>
          <button t-on-click="clear">Clear</button>
      </div>
      <div class="right-thing">
          <div class="content">
              <t t-foreach="state.messages" t-as="message">
                  <t t-widget="Message" t-key="message.id" t-props="message" t-on-remove_message="removeMessage"/>
              </t>
          </div>
      </div>
  </div>
  <div t-name="Message" class="message">
    <span class="author"><t t-esc="props.author"/></span>
    <span class="msg"><t t-esc="props.msg"/></span>
    <button class="remove" t-on-click="removeMessage">Remove</button>
    <t t-widget="Counter"/>
  </div>
  <div t-name="Counter">
    <button t-on-click="increment">Value: <t t-esc="state.counter"/></button>
  </div>
 </templates>
@@ -1,221 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Counter Widget
 //------------------------------------------------------------------------------
 class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      counter: 0
    };
    this.increment = this.increment.bind(this);
  }
  render() {
    return React.createElement(
      "div",
      null,
      React.createElement(
        "button",
        {
          onClick: this.increment
        },
        "Value: ",
        this.state.counter
      )
    );
  }
  increment() {
    this.setState({
      counter: this.state.counter + 1
    });
  }
 }
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 class Message extends React.Component {
  constructor(props) {
    super(props);
    this.removeMessage = this.removeMessage.bind(this);
  }
  render() {
    return React.createElement(
      "div",
      {
        className: "message"
      },
      React.createElement(
        "span",
        {
          className: "author"
        },
        this.props.message.author
      ),
      React.createElement(
        "span",
        {
          className: "msg"
        },
        this.props.message.msg
      ),
      React.createElement(
        "button",
        {
          className: "remove",
          onClick: this.removeMessage
        },
        "Remove"
      ),
      React.createElement(Counter, null)
    );
  }
  removeMessage() {
    this.props.removeCB(this.props.message.id);
  }
 }
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 class Main extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      messages: []
    };
    this.removeMessage = this.removeMessage.bind(this);
  }
  render() {
    const msgList = this.state.messages.map(m =>
      React.createElement(Message, {
        key: m.id,
        message: m,
        removeCB: this.removeMessage
      })
    );
    return React.createElement(
      "div",
      {
        className: "main"
      },
      React.createElement(
        "div",
        {
          className: "left-thing"
        },
        React.createElement(
          "div",
          null,
          "Number of msg: ",
          this.state.messages.length
        ),
        React.createElement(
          "button",
          {
            onClick: _ => this.addMessages(100)
          },
          "Add 100 messages"
        ),
        React.createElement(
          "button",
          {
            onClick: _ => this.addMessages(1000)
          },
          "Add 1000 messages"
        ),
        React.createElement(
          "button",
          {
            onClick: _ => this.addMessages(10000)
          },
          "Add 10000 messages"
        ),
        React.createElement(
          "button",
          {
            onClick: _ => this.addMessages(50000)
          },
          "Add 50000 messages"
        ),
        React.createElement(
          "button",
          {
            onClick: _ => this.updateSomeMessages()
          },
          "Update every 10th messags"
        ),
        React.createElement(
          "button",
          {
            onClick: _ => this.clear()
          },
          "Clear"
        )
      ),
      React.createElement(
        "div",
        {
          className: "right-thing"
        },
        React.createElement(
          "div",
          {
            className: "content"
          },
          msgList
        )
      )
    );
  }
  addMessages(n) {
    startMeasure("add " + n);
    const newMessages = this.state.messages.concat(buildData(n));
    this.setState({
      messages: newMessages
    });
    stopMeasure();
  }
  clear() {
    startMeasure("clear");
    this.setState({
      messages: []
    });
    stopMeasure();
  }
  updateSomeMessages() {
    startMeasure("update every 10th");
    const messages = this.state.messages;
    for (let i = 0; i < messages.length; i += 10) {
      messages[i].author += "!!!";
    }
    this.forceUpdate();
    stopMeasure();
  }
  removeMessage(id) {
    startMeasure("remove message");
    const index = this.state.messages.findIndex(m => m.id === id);
    const messages = this.state.messages.slice();
    messages.splice(index, 1);
    this.setState({
      messages
    });
    stopMeasure();
  }
 } //-----------------------------
 // INIT
 //-----------------------------
 ReactDOM.render(
  React.createElement(Main, null),
  document.getElementById("main")
 );
@@ -1,14 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>React Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='react.production.min.js'></script>
  <script src='react-dom.production.min.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,220 +0,0 @@
 /** @license React v16.8.6
 * react-dom.production.min.js
 *
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 /*
 Modernizr 3.0.0pre (Custom Build) | MIT
 */
 'use strict';(function(da,pb){"object"===typeof exports&&"undefined"!==typeof module?module.exports=pb(require("react")):"function"===typeof define&&define.amd?define(["react"],pb):da.ReactDOM=pb(da.React)})(this,function(da){function pb(a,b,c,d,e,f,g,h){if(!a){a=void 0;if(void 0===b)a=Error("Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.");else{var l=[c,d,e,f,g,h],k=0;a=Error(b.replace(/%s/g,function(){return l[k++]}));
 a.name="Invariant Violation"}a.framesToPop=1;throw a;}}function n(a){for(var b=arguments.length-1,c="https://reactjs.org/docs/error-decoder.html?invariant="+a,d=0;d<b;d++)c+="&args[]="+encodeURIComponent(arguments[d+1]);pb(!1,"Minified React error #"+a+"; visit %s for the full message or use the non-minified dev environment for full errors and additional helpful warnings. ",c)}function rh(a,b,c,d,e,f,g,h,l){qb=!1;$b=null;sh.apply(th,arguments)}function uh(a,b,c,d,e,f,g,h,l){rh.apply(this,arguments);
 if(qb){if(qb){var k=$b;qb=!1;$b=null}else n("198"),k=void 0;ac||(ac=!0,Yc=k)}}function Ee(){if(bc)for(var a in Na){var b=Na[a],c=bc.indexOf(a);-1<c?void 0:n("96",a);if(!cc[c]){b.extractEvents?void 0:n("97",a);cc[c]=b;c=b.eventTypes;for(var d in c){var e=void 0;var f=c[d],g=b,h=d;Zc.hasOwnProperty(h)?n("99",h):void 0;Zc[h]=f;var l=f.phasedRegistrationNames;if(l){for(e in l)l.hasOwnProperty(e)&&Fe(l[e],g,h);e=!0}else f.registrationName?(Fe(f.registrationName,g,h),e=!0):e=!1;e?void 0:n("98",d,a)}}}}
 function Fe(a,b,c){Oa[a]?n("100",a):void 0;Oa[a]=b;$c[a]=b.eventTypes[c].dependencies}function Ge(a,b,c){var d=a.type||"unknown-event";a.currentTarget=He(c);uh(d,b,void 0,a);a.currentTarget=null}function Pa(a,b){null==b?n("30"):void 0;if(null==a)return b;if(Array.isArray(a)){if(Array.isArray(b))return a.push.apply(a,b),a;a.push(b);return a}return Array.isArray(b)?[a].concat(b):[a,b]}function ad(a,b,c){Array.isArray(a)?a.forEach(b,c):a&&b.call(c,a)}function Ie(a,b){var c=a.stateNode;if(!c)return null;
 var d=bd(c);if(!d)return null;c=d[b];a:switch(b){case "onClick":case "onClickCapture":case "onDoubleClick":case "onDoubleClickCapture":case "onMouseDown":case "onMouseDownCapture":case "onMouseMove":case "onMouseMoveCapture":case "onMouseUp":case "onMouseUpCapture":(d=!d.disabled)||(a=a.type,d=!("button"===a||"input"===a||"select"===a||"textarea"===a));a=!d;break a;default:a=!1}if(a)return null;c&&"function"!==typeof c?n("231",b,typeof c):void 0;return c}function cd(a){null!==a&&(rb=Pa(rb,a));a=rb;
 rb=null;if(a&&(ad(a,vh),rb?n("95"):void 0,ac))throw a=Yc,ac=!1,Yc=null,a;}function dc(a){if(a[ea])return a[ea];for(;!a[ea];)if(a.parentNode)a=a.parentNode;else return null;a=a[ea];return 5===a.tag||6===a.tag?a:null}function Je(a){a=a[ea];return!a||5!==a.tag&&6!==a.tag?null:a}function Da(a){if(5===a.tag||6===a.tag)return a.stateNode;n("33")}function dd(a){return a[ec]||null}function fa(a){do a=a.return;while(a&&5!==a.tag);return a?a:null}function Ke(a,b,c){if(b=Ie(a,c.dispatchConfig.phasedRegistrationNames[b]))c._dispatchListeners=
 Pa(c._dispatchListeners,b),c._dispatchInstances=Pa(c._dispatchInstances,a)}function wh(a){if(a&&a.dispatchConfig.phasedRegistrationNames){for(var b=a._targetInst,c=[];b;)c.push(b),b=fa(b);for(b=c.length;0<b--;)Ke(c[b],"captured",a);for(b=0;b<c.length;b++)Ke(c[b],"bubbled",a)}}function ed(a,b,c){a&&c&&c.dispatchConfig.registrationName&&(b=Ie(a,c.dispatchConfig.registrationName))&&(c._dispatchListeners=Pa(c._dispatchListeners,b),c._dispatchInstances=Pa(c._dispatchInstances,a))}function xh(a){a&&a.dispatchConfig.registrationName&&
 ed(a._targetInst,null,a)}function Qa(a){ad(a,wh)}function fc(a,b){var c={};c[a.toLowerCase()]=b.toLowerCase();c["Webkit"+a]="webkit"+b;c["Moz"+a]="moz"+b;return c}function gc(a){if(fd[a])return fd[a];if(!Ra[a])return a;var b=Ra[a],c;for(c in b)if(b.hasOwnProperty(c)&&c in Le)return fd[a]=b[c];return a}function Me(){if(hc)return hc;var a,b=gd,c=b.length,d,e="value"in qa?qa.value:qa.textContent,f=e.length;for(a=0;a<c&&b[a]===e[a];a++);var g=c-a;for(d=1;d<=g&&b[c-d]===e[f-d];d++);return hc=e.slice(a,
 1<d?1-d:void 0)}function ic(){return!0}function jc(){return!1}function J(a,b,c,d){this.dispatchConfig=a;this._targetInst=b;this.nativeEvent=c;a=this.constructor.Interface;for(var e in a)a.hasOwnProperty(e)&&((b=a[e])?this[e]=b(c):"target"===e?this.target=d:this[e]=c[e]);this.isDefaultPrevented=(null!=c.defaultPrevented?c.defaultPrevented:!1===c.returnValue)?ic:jc;this.isPropagationStopped=jc;return this}function yh(a,b,c,d){if(this.eventPool.length){var e=this.eventPool.pop();this.call(e,a,b,c,d);
 return e}return new this(a,b,c,d)}function zh(a){a instanceof this?void 0:n("279");a.destructor();10>this.eventPool.length&&this.eventPool.push(a)}function Ne(a){a.eventPool=[];a.getPooled=yh;a.release=zh}function Oe(a,b){switch(a){case "keyup":return-1!==Ah.indexOf(b.keyCode);case "keydown":return 229!==b.keyCode;case "keypress":case "mousedown":case "blur":return!0;default:return!1}}function Pe(a){a=a.detail;return"object"===typeof a&&"data"in a?a.data:null}function Bh(a,b){switch(a){case "compositionend":return Pe(b);
 case "keypress":if(32!==b.which)return null;Qe=!0;return Re;case "textInput":return a=b.data,a===Re&&Qe?null:a;default:return null}}function Ch(a,b){if(Sa)return"compositionend"===a||!hd&&Oe(a,b)?(a=Me(),hc=gd=qa=null,Sa=!1,a):null;switch(a){case "paste":return null;case "keypress":if(!(b.ctrlKey||b.altKey||b.metaKey)||b.ctrlKey&&b.altKey){if(b.char&&1<b.char.length)return b.char;if(b.which)return String.fromCharCode(b.which)}return null;case "compositionend":return Se&&"ko"!==b.locale?null:b.data;
 default:return null}}function Te(a){if(a=Ue(a)){"function"!==typeof id?n("280"):void 0;var b=bd(a.stateNode);id(a.stateNode,a.type,b)}}function Ve(a){Ta?Ua?Ua.push(a):Ua=[a]:Ta=a}function We(){if(Ta){var a=Ta,b=Ua;Ua=Ta=null;Te(a);if(b)for(a=0;a<b.length;a++)Te(b[a])}}function Xe(a,b){if(jd)return a(b);jd=!0;try{return Ye(a,b)}finally{if(jd=!1,null!==Ta||null!==Ua)Ze(),We()}}function $e(a){var b=a&&a.nodeName&&a.nodeName.toLowerCase();return"input"===b?!!Dh[a.type]:"textarea"===b?!0:!1}function kd(a){a=
 a.target||a.srcElement||window;a.correspondingUseElement&&(a=a.correspondingUseElement);return 3===a.nodeType?a.parentNode:a}function af(a){if(!ra)return!1;a="on"+a;var b=a in document;b||(b=document.createElement("div"),b.setAttribute(a,"return;"),b="function"===typeof b[a]);return b}function bf(a){var b=a.type;return(a=a.nodeName)&&"input"===a.toLowerCase()&&("checkbox"===b||"radio"===b)}function Eh(a){var b=bf(a)?"checked":"value",c=Object.getOwnPropertyDescriptor(a.constructor.prototype,b),d=
 ""+a[b];if(!a.hasOwnProperty(b)&&"undefined"!==typeof c&&"function"===typeof c.get&&"function"===typeof c.set){var e=c.get,f=c.set;Object.defineProperty(a,b,{configurable:!0,get:function(){return e.call(this)},set:function(a){d=""+a;f.call(this,a)}});Object.defineProperty(a,b,{enumerable:c.enumerable});return{getValue:function(){return d},setValue:function(a){d=""+a},stopTracking:function(){a._valueTracker=null;delete a[b]}}}}function kc(a){a._valueTracker||(a._valueTracker=Eh(a))}function cf(a){if(!a)return!1;
 var b=a._valueTracker;if(!b)return!0;var c=b.getValue();var d="";a&&(d=bf(a)?a.checked?"true":"false":a.value);a=d;return a!==c?(b.setValue(a),!0):!1}function sb(a){if(null===a||"object"!==typeof a)return null;a=df&&a[df]||a["@@iterator"];return"function"===typeof a?a:null}function sa(a){if(null==a)return null;if("function"===typeof a)return a.displayName||a.name||null;if("string"===typeof a)return a;switch(a){case ld:return"ConcurrentMode";case ta:return"Fragment";case Va:return"Portal";case lc:return"Profiler";
 case md:return"StrictMode";case nd:return"Suspense"}if("object"===typeof a)switch(a.$$typeof){case ef:return"Context.Consumer";case ff:return"Context.Provider";case od:var b=a.render;b=b.displayName||b.name||"";return a.displayName||(""!==b?"ForwardRef("+b+")":"ForwardRef");case pd:return sa(a.type);case gf:if(a=1===a._status?a._result:null)return sa(a)}return null}function qd(a){var b="";do{a:switch(a.tag){case 3:case 4:case 6:case 7:case 10:case 9:var c="";break a;default:var d=a._debugOwner,e=
 a._debugSource,f=sa(a.type);c=null;d&&(c=sa(d.type));d=f;f="";e?f=" (at "+e.fileName.replace(Fh,"")+":"+e.lineNumber+")":c&&(f=" (created by "+c+")");c="\n    in "+(d||"Unknown")+f}b+=c;a=a.return}while(a);return b}function Gh(a){if(hf.call(jf,a))return!0;if(hf.call(kf,a))return!1;if(Hh.test(a))return jf[a]=!0;kf[a]=!0;return!1}function Ih(a,b,c,d){if(null!==c&&0===c.type)return!1;switch(typeof b){case "function":case "symbol":return!0;case "boolean":if(d)return!1;if(null!==c)return!c.acceptsBooleans;
 a=a.toLowerCase().slice(0,5);return"data-"!==a&&"aria-"!==a;default:return!1}}function Jh(a,b,c,d){if(null===b||"undefined"===typeof b||Ih(a,b,c,d))return!0;if(d)return!1;if(null!==c)switch(c.type){case 3:return!b;case 4:return!1===b;case 5:return isNaN(b);case 6:return isNaN(b)||1>b}return!1}function K(a,b,c,d,e){this.acceptsBooleans=2===b||3===b||4===b;this.attributeName=d;this.attributeNamespace=e;this.mustUseProperty=c;this.propertyName=a;this.type=b}function rd(a,b,c,d){var e=A.hasOwnProperty(b)?
 A[b]:null;var f=null!==e?0===e.type:d?!1:!(2<b.length)||"o"!==b[0]&&"O"!==b[0]||"n"!==b[1]&&"N"!==b[1]?!1:!0;f||(Jh(b,c,e,d)&&(c=null),d||null===e?Gh(b)&&(null===c?a.removeAttribute(b):a.setAttribute(b,""+c)):e.mustUseProperty?a[e.propertyName]=null===c?3===e.type?!1:"":c:(b=e.attributeName,d=e.attributeNamespace,null===c?a.removeAttribute(b):(e=e.type,c=3===e||4===e&&!0===c?"":""+c,d?a.setAttributeNS(d,b,c):a.setAttribute(b,c))))}function ua(a){switch(typeof a){case "boolean":case "number":case "object":case "string":case "undefined":return a;
 default:return""}}function sd(a,b){var c=b.checked;return B({},b,{defaultChecked:void 0,defaultValue:void 0,value:void 0,checked:null!=c?c:a._wrapperState.initialChecked})}function lf(a,b){var c=null==b.defaultValue?"":b.defaultValue,d=null!=b.checked?b.checked:b.defaultChecked;c=ua(null!=b.value?b.value:c);a._wrapperState={initialChecked:d,initialValue:c,controlled:"checkbox"===b.type||"radio"===b.type?null!=b.checked:null!=b.value}}function mf(a,b){b=b.checked;null!=b&&rd(a,"checked",b,!1)}function td(a,
 b){mf(a,b);var c=ua(b.value),d=b.type;if(null!=c)if("number"===d){if(0===c&&""===a.value||a.value!=c)a.value=""+c}else a.value!==""+c&&(a.value=""+c);else if("submit"===d||"reset"===d){a.removeAttribute("value");return}b.hasOwnProperty("value")?ud(a,b.type,c):b.hasOwnProperty("defaultValue")&&ud(a,b.type,ua(b.defaultValue));null==b.checked&&null!=b.defaultChecked&&(a.defaultChecked=!!b.defaultChecked)}function nf(a,b,c){if(b.hasOwnProperty("value")||b.hasOwnProperty("defaultValue")){var d=b.type;
 if(!("submit"!==d&&"reset"!==d||void 0!==b.value&&null!==b.value))return;b=""+a._wrapperState.initialValue;c||b===a.value||(a.value=b);a.defaultValue=b}c=a.name;""!==c&&(a.name="");a.defaultChecked=!a.defaultChecked;a.defaultChecked=!!a._wrapperState.initialChecked;""!==c&&(a.name=c)}function ud(a,b,c){if("number"!==b||a.ownerDocument.activeElement!==a)null==c?a.defaultValue=""+a._wrapperState.initialValue:a.defaultValue!==""+c&&(a.defaultValue=""+c)}function of(a,b,c){a=J.getPooled(pf.change,a,b,
 c);a.type="change";Ve(c);Qa(a);return a}function Kh(a){cd(a)}function mc(a){var b=Da(a);if(cf(b))return a}function Lh(a,b){if("change"===a)return b}function qf(){tb&&(tb.detachEvent("onpropertychange",rf),ub=tb=null)}function rf(a){"value"===a.propertyName&&mc(ub)&&(a=of(ub,a,kd(a)),Xe(Kh,a))}function Mh(a,b,c){"focus"===a?(qf(),tb=b,ub=c,tb.attachEvent("onpropertychange",rf)):"blur"===a&&qf()}function Nh(a,b){if("selectionchange"===a||"keyup"===a||"keydown"===a)return mc(ub)}function Oh(a,b){if("click"===
 a)return mc(b)}function Ph(a,b){if("input"===a||"change"===a)return mc(b)}function Qh(a){var b=this.nativeEvent;return b.getModifierState?b.getModifierState(a):(a=Rh[a])?!!b[a]:!1}function vd(a){return Qh}function Ea(a,b){return a===b&&(0!==a||1/a===1/b)||a!==a&&b!==b}function vb(a,b){if(Ea(a,b))return!0;if("object"!==typeof a||null===a||"object"!==typeof b||null===b)return!1;var c=Object.keys(a),d=Object.keys(b);if(c.length!==d.length)return!1;for(d=0;d<c.length;d++)if(!Sh.call(b,c[d])||!Ea(a[c[d]],
 b[c[d]]))return!1;return!0}function wb(a){var b=a;if(a.alternate)for(;b.return;)b=b.return;else{if(0!==(b.effectTag&2))return 1;for(;b.return;)if(b=b.return,0!==(b.effectTag&2))return 1}return 3===b.tag?2:3}function sf(a){2!==wb(a)?n("188"):void 0}function Th(a){var b=a.alternate;if(!b)return b=wb(a),3===b?n("188"):void 0,1===b?null:a;for(var c=a,d=b;;){var e=c.return,f=e?e.alternate:null;if(!e||!f)break;if(e.child===f.child){for(var g=e.child;g;){if(g===c)return sf(e),a;if(g===d)return sf(e),b;g=
 g.sibling}n("188")}if(c.return!==d.return)c=e,d=f;else{g=!1;for(var h=e.child;h;){if(h===c){g=!0;c=e;d=f;break}if(h===d){g=!0;d=e;c=f;break}h=h.sibling}if(!g){for(h=f.child;h;){if(h===c){g=!0;c=f;d=e;break}if(h===d){g=!0;d=f;c=e;break}h=h.sibling}g?void 0:n("189")}}c.alternate!==d?n("190"):void 0}3!==c.tag?n("188"):void 0;return c.stateNode.current===c?a:b}function tf(a){a=Th(a);if(!a)return null;for(var b=a;;){if(5===b.tag||6===b.tag)return b;if(b.child)b.child.return=b,b=b.child;else{if(b===a)break;
 for(;!b.sibling;){if(!b.return||b.return===a)return null;b=b.return}b.sibling.return=b.return;b=b.sibling}}return null}function nc(a){var b=a.keyCode;"charCode"in a?(a=a.charCode,0===a&&13===b&&(a=13)):a=b;10===a&&(a=13);return 32<=a||13===a?a:0}function uf(a,b){var c=a[0];a=a[1];var d="on"+(a[0].toUpperCase()+a.slice(1));b={phasedRegistrationNames:{bubbled:d,captured:d+"Capture"},dependencies:[c],isInteractive:b};vf[a]=b;wd[c]=b}function Uh(a){var b=a.targetInst,c=b;do{if(!c){a.ancestors.push(c);
 break}var d;for(d=c;d.return;)d=d.return;d=3!==d.tag?null:d.stateNode.containerInfo;if(!d)break;a.ancestors.push(c);c=dc(d)}while(c);for(c=0;c<a.ancestors.length;c++){b=a.ancestors[c];var e=kd(a.nativeEvent);d=a.topLevelType;for(var f=a.nativeEvent,g=null,h=0;h<cc.length;h++){var l=cc[h];l&&(l=l.extractEvents(d,b,f,e))&&(g=Pa(g,l))}cd(g)}}function r(a,b){if(!b)return null;var c=(wf(a)?xf:oc).bind(null,a);b.addEventListener(a,c,!1)}function pc(a,b){if(!b)return null;var c=(wf(a)?xf:oc).bind(null,a);
 b.addEventListener(a,c,!0)}function xf(a,b){yf(oc,a,b)}function oc(a,b){if(qc){var c=kd(b);c=dc(c);null===c||"number"!==typeof c.tag||2===wb(c)||(c=null);if(rc.length){var d=rc.pop();d.topLevelType=a;d.nativeEvent=b;d.targetInst=c;a=d}else a={topLevelType:a,nativeEvent:b,targetInst:c,ancestors:[]};try{Xe(Uh,a)}finally{a.topLevelType=null,a.nativeEvent=null,a.targetInst=null,a.ancestors.length=0,10>rc.length&&rc.push(a)}}}function zf(a){Object.prototype.hasOwnProperty.call(a,sc)||(a[sc]=Vh++,Af[a[sc]]=
 {});return Af[a[sc]]}function xd(a){a=a||("undefined"!==typeof document?document:void 0);if("undefined"===typeof a)return null;try{return a.activeElement||a.body}catch(b){return a.body}}function Bf(a){for(;a&&a.firstChild;)a=a.firstChild;return a}function Cf(a,b){var c=Bf(a);a=0;for(var d;c;){if(3===c.nodeType){d=a+c.textContent.length;if(a<=b&&d>=b)return{node:c,offset:b-a};a=d}a:{for(;c;){if(c.nextSibling){c=c.nextSibling;break a}c=c.parentNode}c=void 0}c=Bf(c)}}function Df(a,b){return a&&b?a===
 b?!0:a&&3===a.nodeType?!1:b&&3===b.nodeType?Df(a,b.parentNode):"contains"in a?a.contains(b):a.compareDocumentPosition?!!(a.compareDocumentPosition(b)&16):!1:!1}function Ef(){for(var a=window,b=xd();b instanceof a.HTMLIFrameElement;){try{var c="string"===typeof b.contentWindow.location.href}catch(d){c=!1}if(c)a=b.contentWindow;else break;b=xd(a.document)}return b}function yd(a){var b=a&&a.nodeName&&a.nodeName.toLowerCase();return b&&("input"===b&&("text"===a.type||"search"===a.type||"tel"===a.type||
 "url"===a.type||"password"===a.type)||"textarea"===b||"true"===a.contentEditable)}function Wh(){var a=Ef();if(yd(a)){if("selectionStart"in a)var b={start:a.selectionStart,end:a.selectionEnd};else a:{b=(b=a.ownerDocument)&&b.defaultView||window;var c=b.getSelection&&b.getSelection();if(c&&0!==c.rangeCount){b=c.anchorNode;var d=c.anchorOffset,e=c.focusNode;c=c.focusOffset;try{b.nodeType,e.nodeType}catch(cj){b=null;break a}var f=0,g=-1,h=-1,l=0,k=0,m=a,n=null;b:for(;;){for(var p;;){m!==b||0!==d&&3!==
 m.nodeType||(g=f+d);m!==e||0!==c&&3!==m.nodeType||(h=f+c);3===m.nodeType&&(f+=m.nodeValue.length);if(null===(p=m.firstChild))break;n=m;m=p}for(;;){if(m===a)break b;n===b&&++l===d&&(g=f);n===e&&++k===c&&(h=f);if(null!==(p=m.nextSibling))break;m=n;n=m.parentNode}m=p}b=-1===g||-1===h?null:{start:g,end:h}}else b=null}b=b||{start:0,end:0}}else b=null;return{focusedElem:a,selectionRange:b}}function Xh(a){var b=Ef(),c=a.focusedElem,d=a.selectionRange;if(b!==c&&c&&c.ownerDocument&&Df(c.ownerDocument.documentElement,
 c)){if(null!==d&&yd(c))if(b=d.start,a=d.end,void 0===a&&(a=b),"selectionStart"in c)c.selectionStart=b,c.selectionEnd=Math.min(a,c.value.length);else if(a=(b=c.ownerDocument||document)&&b.defaultView||window,a.getSelection){a=a.getSelection();var e=c.textContent.length,f=Math.min(d.start,e);d=void 0===d.end?f:Math.min(d.end,e);!a.extend&&f>d&&(e=d,d=f,f=e);e=Cf(c,f);var g=Cf(c,d);e&&g&&(1!==a.rangeCount||a.anchorNode!==e.node||a.anchorOffset!==e.offset||a.focusNode!==g.node||a.focusOffset!==g.offset)&&
 (b=b.createRange(),b.setStart(e.node,e.offset),a.removeAllRanges(),f>d?(a.addRange(b),a.extend(g.node,g.offset)):(b.setEnd(g.node,g.offset),a.addRange(b)))}b=[];for(a=c;a=a.parentNode;)1===a.nodeType&&b.push({element:a,left:a.scrollLeft,top:a.scrollTop});"function"===typeof c.focus&&c.focus();for(c=0;c<b.length;c++)a=b[c],a.element.scrollLeft=a.left,a.element.scrollTop=a.top}}function Gf(a,b){var c=b.window===b?b.document:9===b.nodeType?b:b.ownerDocument;if(zd||null==Wa||Wa!==xd(c))return null;c=
 Wa;"selectionStart"in c&&yd(c)?c={start:c.selectionStart,end:c.selectionEnd}:(c=(c.ownerDocument&&c.ownerDocument.defaultView||window).getSelection(),c={anchorNode:c.anchorNode,anchorOffset:c.anchorOffset,focusNode:c.focusNode,focusOffset:c.focusOffset});return xb&&vb(xb,c)?null:(xb=c,a=J.getPooled(Hf.select,Ad,a,b),a.type="select",a.target=Wa,Qa(a),a)}function Yh(a){var b="";da.Children.forEach(a,function(a){null!=a&&(b+=a)});return b}function Bd(a,b){a=B({children:void 0},b);if(b=Yh(b.children))a.children=
 b;return a}function Xa(a,b,c,d){a=a.options;if(b){b={};for(var e=0;e<c.length;e++)b["$"+c[e]]=!0;for(c=0;c<a.length;c++)e=b.hasOwnProperty("$"+a[c].value),a[c].selected!==e&&(a[c].selected=e),e&&d&&(a[c].defaultSelected=!0)}else{c=""+ua(c);b=null;for(e=0;e<a.length;e++){if(a[e].value===c){a[e].selected=!0;d&&(a[e].defaultSelected=!0);return}null!==b||a[e].disabled||(b=a[e])}null!==b&&(b.selected=!0)}}function Cd(a,b){null!=b.dangerouslySetInnerHTML?n("91"):void 0;return B({},b,{value:void 0,defaultValue:void 0,
 children:""+a._wrapperState.initialValue})}function If(a,b){var c=b.value;null==c&&(c=b.defaultValue,b=b.children,null!=b&&(null!=c?n("92"):void 0,Array.isArray(b)&&(1>=b.length?void 0:n("93"),b=b[0]),c=b),null==c&&(c=""));a._wrapperState={initialValue:ua(c)}}function Jf(a,b){var c=ua(b.value),d=ua(b.defaultValue);null!=c&&(c=""+c,c!==a.value&&(a.value=c),null==b.defaultValue&&a.defaultValue!==c&&(a.defaultValue=c));null!=d&&(a.defaultValue=""+d)}function Kf(a){switch(a){case "svg":return"http://www.w3.org/2000/svg";
 case "math":return"http://www.w3.org/1998/Math/MathML";default:return"http://www.w3.org/1999/xhtml"}}function Dd(a,b){return null==a||"http://www.w3.org/1999/xhtml"===a?Kf(b):"http://www.w3.org/2000/svg"===a&&"foreignObject"===b?"http://www.w3.org/1999/xhtml":a}function Lf(a,b,c){return null==b||"boolean"===typeof b||""===b?"":c||"number"!==typeof b||0===b||yb.hasOwnProperty(a)&&yb[a]?(""+b).trim():b+"px"}function Mf(a,b){a=a.style;for(var c in b)if(b.hasOwnProperty(c)){var d=0===c.indexOf("--"),
 e=Lf(c,b[c],d);"float"===c&&(c="cssFloat");d?a.setProperty(c,e):a[c]=e}}function Ed(a,b){b&&(Zh[a]&&(null!=b.children||null!=b.dangerouslySetInnerHTML?n("137",a,""):void 0),null!=b.dangerouslySetInnerHTML&&(null!=b.children?n("60"):void 0,"object"===typeof b.dangerouslySetInnerHTML&&"__html"in b.dangerouslySetInnerHTML?void 0:n("61")),null!=b.style&&"object"!==typeof b.style?n("62",""):void 0)}function Fd(a,b){if(-1===a.indexOf("-"))return"string"===typeof b.is;switch(a){case "annotation-xml":case "color-profile":case "font-face":case "font-face-src":case "font-face-uri":case "font-face-format":case "font-face-name":case "missing-glyph":return!1;
 default:return!0}}function ha(a,b){a=9===a.nodeType||11===a.nodeType?a:a.ownerDocument;var c=zf(a);b=$c[b];for(var d=0;d<b.length;d++){var e=b[d];if(!c.hasOwnProperty(e)||!c[e]){switch(e){case "scroll":pc("scroll",a);break;case "focus":case "blur":pc("focus",a);pc("blur",a);c.blur=!0;c.focus=!0;break;case "cancel":case "close":af(e)&&pc(e,a);break;case "invalid":case "submit":case "reset":break;default:-1===zb.indexOf(e)&&r(e,a)}c[e]=!0}}}function tc(){}function Nf(a,b){switch(a){case "button":case "input":case "select":case "textarea":return!!b.autoFocus}return!1}
 function Gd(a,b){return"textarea"===a||"option"===a||"noscript"===a||"string"===typeof b.children||"number"===typeof b.children||"object"===typeof b.dangerouslySetInnerHTML&&null!==b.dangerouslySetInnerHTML&&null!=b.dangerouslySetInnerHTML.__html}function $h(a,b,c,d,e,f){a[ec]=e;"input"===c&&"radio"===e.type&&null!=e.name&&mf(a,e);Fd(c,d);d=Fd(c,e);for(f=0;f<b.length;f+=2){var g=b[f],h=b[f+1];"style"===g?Mf(a,h):"dangerouslySetInnerHTML"===g?Of(a,h):"children"===g?Ab(a,h):rd(a,g,h,d)}switch(c){case "input":td(a,
 e);break;case "textarea":Jf(a,e);break;case "select":b=a._wrapperState.wasMultiple,a._wrapperState.wasMultiple=!!e.multiple,c=e.value,null!=c?Xa(a,!!e.multiple,c,!1):b!==!!e.multiple&&(null!=e.defaultValue?Xa(a,!!e.multiple,e.defaultValue,!0):Xa(a,!!e.multiple,e.multiple?[]:"",!1))}}function Hd(a){for(a=a.nextSibling;a&&1!==a.nodeType&&3!==a.nodeType;)a=a.nextSibling;return a}function Pf(a){for(a=a.firstChild;a&&1!==a.nodeType&&3!==a.nodeType;)a=a.nextSibling;return a}function D(a,b){0>Ya||(a.current=
 Id[Ya],Id[Ya]=null,Ya--)}function L(a,b,c){Ya++;Id[Ya]=a.current;a.current=b}function Za(a,b){var c=a.type.contextTypes;if(!c)return va;var d=a.stateNode;if(d&&d.__reactInternalMemoizedUnmaskedChildContext===b)return d.__reactInternalMemoizedMaskedChildContext;var e={},f;for(f in c)e[f]=b[f];d&&(a=a.stateNode,a.__reactInternalMemoizedUnmaskedChildContext=b,a.__reactInternalMemoizedMaskedChildContext=e);return e}function E(a){a=a.childContextTypes;return null!==a&&void 0!==a}function uc(a){D(M,a);
 D(F,a)}function Jd(a){D(M,a);D(F,a)}function Qf(a,b,c){F.current!==va?n("168"):void 0;L(F,b,a);L(M,c,a)}function Rf(a,b,c){var d=a.stateNode;a=b.childContextTypes;if("function"!==typeof d.getChildContext)return c;d=d.getChildContext();for(var e in d)e in a?void 0:n("108",sa(b)||"Unknown",e);return B({},c,d)}function vc(a){var b=a.stateNode;b=b&&b.__reactInternalMemoizedMergedChildContext||va;Fa=F.current;L(F,b,a);L(M,M.current,a);return!0}function Sf(a,b,c){var d=a.stateNode;d?void 0:n("169");c?(b=
 Rf(a,b,Fa),d.__reactInternalMemoizedMergedChildContext=b,D(M,a),D(F,a),L(F,b,a)):D(M,a);L(M,c,a)}function Tf(a){return function(b){try{return a(b)}catch(c){}}}function ai(a){if("undefined"===typeof __REACT_DEVTOOLS_GLOBAL_HOOK__)return!1;var b=__REACT_DEVTOOLS_GLOBAL_HOOK__;if(b.isDisabled||!b.supportsFiber)return!0;try{var c=b.inject(a);Kd=Tf(function(a){return b.onCommitFiberRoot(c,a)});Ld=Tf(function(a){return b.onCommitFiberUnmount(c,a)})}catch(d){}return!0}function bi(a,b,c,d){this.tag=a;this.key=
 c;this.sibling=this.child=this.return=this.stateNode=this.type=this.elementType=null;this.index=0;this.ref=null;this.pendingProps=b;this.contextDependencies=this.memoizedState=this.updateQueue=this.memoizedProps=null;this.mode=d;this.effectTag=0;this.lastEffect=this.firstEffect=this.nextEffect=null;this.childExpirationTime=this.expirationTime=0;this.alternate=null}function Md(a){a=a.prototype;return!(!a||!a.isReactComponent)}function ci(a){if("function"===typeof a)return Md(a)?1:0;if(void 0!==a&&
 null!==a){a=a.$$typeof;if(a===od)return 11;if(a===pd)return 14}return 2}function Ga(a,b,c){c=a.alternate;null===c?(c=S(a.tag,b,a.key,a.mode),c.elementType=a.elementType,c.type=a.type,c.stateNode=a.stateNode,c.alternate=a,a.alternate=c):(c.pendingProps=b,c.effectTag=0,c.nextEffect=null,c.firstEffect=null,c.lastEffect=null);c.childExpirationTime=a.childExpirationTime;c.expirationTime=a.expirationTime;c.child=a.child;c.memoizedProps=a.memoizedProps;c.memoizedState=a.memoizedState;c.updateQueue=a.updateQueue;
 c.contextDependencies=a.contextDependencies;c.sibling=a.sibling;c.index=a.index;c.ref=a.ref;return c}function wc(a,b,c,d,e,f){var g=2;d=a;if("function"===typeof a)Md(a)&&(g=1);else if("string"===typeof a)g=5;else a:switch(a){case ta:return wa(c.children,e,f,b);case ld:return Uf(c,e|3,f,b);case md:return Uf(c,e|2,f,b);case lc:return a=S(12,c,b,e|4),a.elementType=lc,a.type=lc,a.expirationTime=f,a;case nd:return a=S(13,c,b,e),b=nd,a.elementType=b,a.type=b,a.expirationTime=f,a;default:if("object"===typeof a&&
 null!==a)switch(a.$$typeof){case ff:g=10;break a;case ef:g=9;break a;case od:g=11;break a;case pd:g=14;break a;case gf:g=16;d=null;break a}n("130",null==a?a:typeof a,"")}b=S(g,c,b,e);b.elementType=a;b.type=d;b.expirationTime=f;return b}function wa(a,b,c,d){a=S(7,a,d,b);a.expirationTime=c;return a}function Uf(a,b,c,d){a=S(8,a,d,b);b=0===(b&1)?md:ld;a.elementType=b;a.type=b;a.expirationTime=c;return a}function Nd(a,b,c){a=S(6,a,null,b);a.expirationTime=c;return a}function Od(a,b,c){b=S(4,null!==a.children?
 a.children:[],a.key,b);b.expirationTime=c;b.stateNode={containerInfo:a.containerInfo,pendingChildren:null,implementation:a.implementation};return b}function Bb(a,b){a.didError=!1;var c=a.earliestPendingTime;0===c?a.earliestPendingTime=a.latestPendingTime=b:c<b?a.earliestPendingTime=b:a.latestPendingTime>b&&(a.latestPendingTime=b);xc(b,a)}function di(a,b){a.didError=!1;if(0===b)a.earliestPendingTime=0,a.latestPendingTime=0,a.earliestSuspendedTime=0,a.latestSuspendedTime=0,a.latestPingedTime=0;else{b<
 a.latestPingedTime&&(a.latestPingedTime=0);var c=a.latestPendingTime;0!==c&&(c>b?a.earliestPendingTime=a.latestPendingTime=0:a.earliestPendingTime>b&&(a.earliestPendingTime=a.latestPendingTime));c=a.earliestSuspendedTime;0===c?Bb(a,b):b<a.latestSuspendedTime?(a.earliestSuspendedTime=0,a.latestSuspendedTime=0,a.latestPingedTime=0,Bb(a,b)):b>c&&Bb(a,b)}xc(0,a)}function Vf(a,b){a.didError=!1;a.latestPingedTime>=b&&(a.latestPingedTime=0);var c=a.earliestPendingTime,d=a.latestPendingTime;c===b?a.earliestPendingTime=
 d===b?a.latestPendingTime=0:d:d===b&&(a.latestPendingTime=c);c=a.earliestSuspendedTime;d=a.latestSuspendedTime;0===c?a.earliestSuspendedTime=a.latestSuspendedTime=b:c<b?a.earliestSuspendedTime=b:d>b&&(a.latestSuspendedTime=b);xc(b,a)}function Wf(a,b){var c=a.earliestPendingTime;a=a.earliestSuspendedTime;c>b&&(b=c);a>b&&(b=a);return b}function xc(a,b){var c=b.earliestSuspendedTime,d=b.latestSuspendedTime,e=b.earliestPendingTime,f=b.latestPingedTime;e=0!==e?e:f;0===e&&(0===a||d<a)&&(e=d);a=e;0!==a&&
 c>a&&(a=c);b.nextExpirationTimeToWorkOn=e;b.expirationTime=a}function P(a,b){if(a&&a.defaultProps){b=B({},b);a=a.defaultProps;for(var c in a)void 0===b[c]&&(b[c]=a[c])}return b}function ei(a){var b=a._result;switch(a._status){case 1:return b;case 2:throw b;case 0:throw b;default:a._status=0;b=a._ctor;b=b();b.then(function(b){0===a._status&&(b=b.default,a._status=1,a._result=b)},function(b){0===a._status&&(a._status=2,a._result=b)});switch(a._status){case 1:return a._result;case 2:throw a._result;
 }a._result=b;throw b;}}function yc(a,b,c,d){b=a.memoizedState;c=c(d,b);c=null===c||void 0===c?b:B({},b,c);a.memoizedState=c;d=a.updateQueue;null!==d&&0===a.expirationTime&&(d.baseState=c)}function Xf(a,b,c,d,e,f,g){a=a.stateNode;return"function"===typeof a.shouldComponentUpdate?a.shouldComponentUpdate(d,f,g):b.prototype&&b.prototype.isPureReactComponent?!vb(c,d)||!vb(e,f):!0}function Yf(a,b,c,d){var e=!1;d=va;var f=b.contextType;"object"===typeof f&&null!==f?f=T(f):(d=E(b)?Fa:F.current,e=b.contextTypes,
 f=(e=null!==e&&void 0!==e)?Za(a,d):va);b=new b(c,f);a.memoizedState=null!==b.state&&void 0!==b.state?b.state:null;b.updater=zc;a.stateNode=b;b._reactInternalFiber=a;e&&(a=a.stateNode,a.__reactInternalMemoizedUnmaskedChildContext=d,a.__reactInternalMemoizedMaskedChildContext=f);return b}function Zf(a,b,c,d){a=b.state;"function"===typeof b.componentWillReceiveProps&&b.componentWillReceiveProps(c,d);"function"===typeof b.UNSAFE_componentWillReceiveProps&&b.UNSAFE_componentWillReceiveProps(c,d);b.state!==
 a&&zc.enqueueReplaceState(b,b.state,null)}function Pd(a,b,c,d){var e=a.stateNode;e.props=c;e.state=a.memoizedState;e.refs=$f;var f=b.contextType;"object"===typeof f&&null!==f?e.context=T(f):(f=E(b)?Fa:F.current,e.context=Za(a,f));f=a.updateQueue;null!==f&&(Cb(a,f,c,e,d),e.state=a.memoizedState);f=b.getDerivedStateFromProps;"function"===typeof f&&(yc(a,b,f,c),e.state=a.memoizedState);"function"===typeof b.getDerivedStateFromProps||"function"===typeof e.getSnapshotBeforeUpdate||"function"!==typeof e.UNSAFE_componentWillMount&&
 "function"!==typeof e.componentWillMount||(b=e.state,"function"===typeof e.componentWillMount&&e.componentWillMount(),"function"===typeof e.UNSAFE_componentWillMount&&e.UNSAFE_componentWillMount(),b!==e.state&&zc.enqueueReplaceState(e,e.state,null),f=a.updateQueue,null!==f&&(Cb(a,f,c,e,d),e.state=a.memoizedState));"function"===typeof e.componentDidMount&&(a.effectTag|=4)}function Db(a,b,c){a=c.ref;if(null!==a&&"function"!==typeof a&&"object"!==typeof a){if(c._owner){c=c._owner;var d=void 0;c&&(1!==
 c.tag?n("309"):void 0,d=c.stateNode);d?void 0:n("147",a);var e=""+a;if(null!==b&&null!==b.ref&&"function"===typeof b.ref&&b.ref._stringRef===e)return b.ref;b=function(a){var b=d.refs;b===$f&&(b=d.refs={});null===a?delete b[e]:b[e]=a};b._stringRef=e;return b}"string"!==typeof a?n("284"):void 0;c._owner?void 0:n("290",a)}return a}function Ac(a,b){"textarea"!==a.type&&n("31","[object Object]"===Object.prototype.toString.call(b)?"object with keys {"+Object.keys(b).join(", ")+"}":b,"")}function ag(a){function b(b,
 c){if(a){var d=b.lastEffect;null!==d?(d.nextEffect=c,b.lastEffect=c):b.firstEffect=b.lastEffect=c;c.nextEffect=null;c.effectTag=8}}function c(c,d){if(!a)return null;for(;null!==d;)b(c,d),d=d.sibling;return null}function d(a,b){for(a=new Map;null!==b;)null!==b.key?a.set(b.key,b):a.set(b.index,b),b=b.sibling;return a}function e(a,b,c){a=Ga(a,b,c);a.index=0;a.sibling=null;return a}function f(b,c,d){b.index=d;if(!a)return c;d=b.alternate;if(null!==d)return d=d.index,d<c?(b.effectTag=2,c):d;b.effectTag=
 2;return c}function g(b){a&&null===b.alternate&&(b.effectTag=2);return b}function h(a,b,c,d){if(null===b||6!==b.tag)return b=Nd(c,a.mode,d),b.return=a,b;b=e(b,c,d);b.return=a;return b}function l(a,b,c,d){if(null!==b&&b.elementType===c.type)return d=e(b,c.props,d),d.ref=Db(a,b,c),d.return=a,d;d=wc(c.type,c.key,c.props,null,a.mode,d);d.ref=Db(a,b,c);d.return=a;return d}function k(a,b,c,d){if(null===b||4!==b.tag||b.stateNode.containerInfo!==c.containerInfo||b.stateNode.implementation!==c.implementation)return b=
 Od(c,a.mode,d),b.return=a,b;b=e(b,c.children||[],d);b.return=a;return b}function m(a,b,c,d,f){if(null===b||7!==b.tag)return b=wa(c,a.mode,d,f),b.return=a,b;b=e(b,c,d);b.return=a;return b}function Ff(a,b,c){if("string"===typeof b||"number"===typeof b)return b=Nd(""+b,a.mode,c),b.return=a,b;if("object"===typeof b&&null!==b){switch(b.$$typeof){case Bc:return c=wc(b.type,b.key,b.props,null,a.mode,c),c.ref=Db(a,null,b),c.return=a,c;case Va:return b=Od(b,a.mode,c),b.return=a,b}if(Cc(b)||sb(b))return b=
 wa(b,a.mode,c,null),b.return=a,b;Ac(a,b)}return null}function p(a,b,c,d){var e=null!==b?b.key:null;if("string"===typeof c||"number"===typeof c)return null!==e?null:h(a,b,""+c,d);if("object"===typeof c&&null!==c){switch(c.$$typeof){case Bc:return c.key===e?c.type===ta?m(a,b,c.props.children,d,e):l(a,b,c,d):null;case Va:return c.key===e?k(a,b,c,d):null}if(Cc(c)||sb(c))return null!==e?null:m(a,b,c,d,null);Ac(a,c)}return null}function r(a,b,c,d,e){if("string"===typeof d||"number"===typeof d)return a=
 a.get(c)||null,h(b,a,""+d,e);if("object"===typeof d&&null!==d){switch(d.$$typeof){case Bc:return a=a.get(null===d.key?c:d.key)||null,d.type===ta?m(b,a,d.props.children,e,d.key):l(b,a,d,e);case Va:return a=a.get(null===d.key?c:d.key)||null,k(b,a,d,e)}if(Cc(d)||sb(d))return a=a.get(c)||null,m(b,a,d,e,null);Ac(b,d)}return null}function u(e,g,h,k){for(var l=null,m=null,n=g,q=g=0,v=null;null!==n&&q<h.length;q++){n.index>q?(v=n,n=null):v=n.sibling;var Q=p(e,n,h[q],k);if(null===Q){null===n&&(n=v);break}a&&
 n&&null===Q.alternate&&b(e,n);g=f(Q,g,q);null===m?l=Q:m.sibling=Q;m=Q;n=v}if(q===h.length)return c(e,n),l;if(null===n){for(;q<h.length;q++)if(n=Ff(e,h[q],k))g=f(n,g,q),null===m?l=n:m.sibling=n,m=n;return l}for(n=d(e,n);q<h.length;q++)if(v=r(n,e,q,h[q],k))a&&null!==v.alternate&&n.delete(null===v.key?q:v.key),g=f(v,g,q),null===m?l=v:m.sibling=v,m=v;a&&n.forEach(function(a){return b(e,a)});return l}function x(e,g,h,k){var l=sb(h);"function"!==typeof l?n("150"):void 0;h=l.call(h);null==h?n("151"):void 0;
 for(var m=l=null,q=g,v=g=0,Q=null,t=h.next();null!==q&&!t.done;v++,t=h.next()){q.index>v?(Q=q,q=null):Q=q.sibling;var u=p(e,q,t.value,k);if(null===u){q||(q=Q);break}a&&q&&null===u.alternate&&b(e,q);g=f(u,g,v);null===m?l=u:m.sibling=u;m=u;q=Q}if(t.done)return c(e,q),l;if(null===q){for(;!t.done;v++,t=h.next())t=Ff(e,t.value,k),null!==t&&(g=f(t,g,v),null===m?l=t:m.sibling=t,m=t);return l}for(q=d(e,q);!t.done;v++,t=h.next())t=r(q,e,v,t.value,k),null!==t&&(a&&null!==t.alternate&&q.delete(null===t.key?
 v:t.key),g=f(t,g,v),null===m?l=t:m.sibling=t,m=t);a&&q.forEach(function(a){return b(e,a)});return l}return function(a,d,f,h){var k="object"===typeof f&&null!==f&&f.type===ta&&null===f.key;k&&(f=f.props.children);var l="object"===typeof f&&null!==f;if(l)switch(f.$$typeof){case Bc:a:{l=f.key;for(k=d;null!==k;){if(k.key===l)if(7===k.tag?f.type===ta:k.elementType===f.type){c(a,k.sibling);d=e(k,f.type===ta?f.props.children:f.props,h);d.ref=Db(a,k,f);d.return=a;a=d;break a}else{c(a,k);break}else b(a,k);
 k=k.sibling}f.type===ta?(d=wa(f.props.children,a.mode,h,f.key),d.return=a,a=d):(h=wc(f.type,f.key,f.props,null,a.mode,h),h.ref=Db(a,d,f),h.return=a,a=h)}return g(a);case Va:a:{for(k=f.key;null!==d;){if(d.key===k)if(4===d.tag&&d.stateNode.containerInfo===f.containerInfo&&d.stateNode.implementation===f.implementation){c(a,d.sibling);d=e(d,f.children||[],h);d.return=a;a=d;break a}else{c(a,d);break}else b(a,d);d=d.sibling}d=Od(f,a.mode,h);d.return=a;a=d}return g(a)}if("string"===typeof f||"number"===
 typeof f)return f=""+f,null!==d&&6===d.tag?(c(a,d.sibling),d=e(d,f,h),d.return=a,a=d):(c(a,d),d=Nd(f,a.mode,h),d.return=a,a=d),g(a);if(Cc(f))return u(a,d,f,h);if(sb(f))return x(a,d,f,h);l&&Ac(a,f);if("undefined"===typeof f&&!k)switch(a.tag){case 1:case 0:h=a.type,n("152",h.displayName||h.name||"Component")}return c(a,d)}}function Ha(a){a===Eb?n("174"):void 0;return a}function Qd(a,b){L(Fb,b,a);L(Gb,a,a);L(U,Eb,a);var c=b.nodeType;switch(c){case 9:case 11:b=(b=b.documentElement)?b.namespaceURI:Dd(null,
 "");break;default:c=8===c?b.parentNode:b,b=c.namespaceURI||null,c=c.tagName,b=Dd(b,c)}D(U,a);L(U,b,a)}function $a(a){D(U,a);D(Gb,a);D(Fb,a)}function bg(a){Ha(Fb.current);var b=Ha(U.current);var c=Dd(b,a.type);b!==c&&(L(Gb,a,a),L(U,c,a))}function Rd(a){Gb.current===a&&(D(U,a),D(Gb,a))}function V(){n("321")}function Sd(a,b){if(null===b)return!1;for(var c=0;c<b.length&&c<a.length;c++)if(!Ea(a[c],b[c]))return!1;return!0}function Td(a,b,c,d,e,f){Hb=f;xa=b;W=null!==a?a.memoizedState:null;Dc.current=null===
 W?fi:cg;b=c(d,e);if(Ib){do Ib=!1,Jb+=1,W=null!==a?a.memoizedState:null,ab=bb,X=G=y=null,Dc.current=cg,b=c(d,e);while(Ib);ia=null;Jb=0}Dc.current=Ud;a=xa;a.memoizedState=bb;a.expirationTime=Kb;a.updateQueue=X;a.effectTag|=Lb;a=null!==y&&null!==y.next;Hb=0;ab=G=bb=W=y=xa=null;Kb=0;X=null;Lb=0;a?n("300"):void 0;return b}function Vd(){Dc.current=Ud;Hb=0;ab=G=bb=W=y=xa=null;Kb=0;X=null;Lb=0;Ib=!1;ia=null;Jb=0}function cb(){var a={memoizedState:null,baseState:null,queue:null,baseUpdate:null,next:null};
 null===G?bb=G=a:G=G.next=a;return G}function Mb(){if(null!==ab)G=ab,ab=G.next,y=W,W=null!==y?y.next:null;else{null===W?n("310"):void 0;y=W;var a={memoizedState:y.memoizedState,baseState:y.baseState,queue:y.queue,baseUpdate:y.baseUpdate,next:null};G=null===G?bb=a:G.next=a;W=y.next}return G}function dg(a,b){return"function"===typeof b?b(a):b}function eg(a,b,c){b=Mb();c=b.queue;null===c?n("311"):void 0;c.lastRenderedReducer=a;if(0<Jb){var d=c.dispatch;if(null!==ia){var e=ia.get(c);if(void 0!==e){ia.delete(c);
 var f=b.memoizedState;do f=a(f,e.action),e=e.next;while(null!==e);Ea(f,b.memoizedState)||(ja=!0);b.memoizedState=f;b.baseUpdate===c.last&&(b.baseState=f);c.lastRenderedState=f;return[f,d]}}return[b.memoizedState,d]}d=c.last;var g=b.baseUpdate;f=b.baseState;null!==g?(null!==d&&(d.next=null),d=g.next):d=null!==d?d.next:null;if(null!==d){var h=e=null,l=d,k=!1;do{var m=l.expirationTime;m<Hb?(k||(k=!0,h=g,e=f),m>Kb&&(Kb=m)):f=l.eagerReducer===a?l.eagerState:a(f,l.action);g=l;l=l.next}while(null!==l&&l!==
 d);k||(h=g,e=f);Ea(f,b.memoizedState)||(ja=!0);b.memoizedState=f;b.baseUpdate=h;b.baseState=e;c.lastRenderedState=f}return[b.memoizedState,c.dispatch]}function Wd(a,b,c,d){a={tag:a,create:b,destroy:c,deps:d,next:null};null===X?(X={lastEffect:null},X.lastEffect=a.next=a):(b=X.lastEffect,null===b?X.lastEffect=a.next=a:(c=b.next,b.next=a,a.next=c,X.lastEffect=a));return a}function Xd(a,b,c,d){var e=cb();Lb|=a;e.memoizedState=Wd(b,c,void 0,void 0===d?null:d)}function Yd(a,b,c,d){var e=Mb();d=void 0===
 d?null:d;var f=void 0;if(null!==y){var g=y.memoizedState;f=g.destroy;if(null!==d&&Sd(d,g.deps)){Wd(db,c,f,d);return}}Lb|=a;e.memoizedState=Wd(b,c,f,d)}function fg(a,b){if("function"===typeof b)return a=a(),b(a),function(){b(null)};if(null!==b&&void 0!==b)return a=a(),b.current=a,function(){b.current=null}}function gg(a,b){}function hg(a,b,c){25>Jb?void 0:n("301");var d=a.alternate;if(a===xa||null!==d&&d===xa)if(Ib=!0,a={expirationTime:Hb,action:c,eagerReducer:null,eagerState:null,next:null},null===
 ia&&(ia=new Map),c=ia.get(b),void 0===c)ia.set(b,a);else{for(b=c;null!==b.next;)b=b.next;b.next=a}else{eb();var e=ka();e=fb(e,a);var f={expirationTime:e,action:c,eagerReducer:null,eagerState:null,next:null},g=b.last;if(null===g)f.next=f;else{var h=g.next;null!==h&&(f.next=h);g.next=f}b.last=f;if(0===a.expirationTime&&(null===d||0===d.expirationTime)&&(d=b.lastRenderedReducer,null!==d))try{var l=b.lastRenderedState,k=d(l,c);f.eagerReducer=d;f.eagerState=k;if(Ea(k,l))return}catch(m){}finally{}ya(a,
 e)}}function ig(a,b){var c=S(5,null,null,0);c.elementType="DELETED";c.type="DELETED";c.stateNode=b;c.return=a;c.effectTag=8;null!==a.lastEffect?(a.lastEffect.nextEffect=c,a.lastEffect=c):a.firstEffect=a.lastEffect=c}function jg(a,b){switch(a.tag){case 5:var c=a.type;b=1!==b.nodeType||c.toLowerCase()!==b.nodeName.toLowerCase()?null:b;return null!==b?(a.stateNode=b,!0):!1;case 6:return b=""===a.pendingProps||3!==b.nodeType?null:b,null!==b?(a.stateNode=b,!0):!1;case 13:return!1;default:return!1}}function kg(a){if(Ia){var b=
 gb;if(b){var c=b;if(!jg(a,b)){b=Hd(c);if(!b||!jg(a,b)){a.effectTag|=2;Ia=!1;la=a;return}ig(la,c)}la=a;gb=Pf(b)}else a.effectTag|=2,Ia=!1,la=a}}function lg(a){for(a=a.return;null!==a&&5!==a.tag&&3!==a.tag&&18!==a.tag;)a=a.return;la=a}function Zd(a){if(a!==la)return!1;if(!Ia)return lg(a),Ia=!0,!1;var b=a.type;if(5!==a.tag||"head"!==b&&"body"!==b&&!Gd(b,a.memoizedProps))for(b=gb;b;)ig(a,b),b=Hd(b);lg(a);gb=la?Hd(a.stateNode):null;return!0}function $d(){gb=la=null;Ia=!1}function N(a,b,c,d){b.child=null===
 a?ae(b,null,c,d):hb(b,a.child,c,d)}function mg(a,b,c,d,e){c=c.render;var f=b.ref;ib(b,e);d=Td(a,b,c,d,f,e);if(null!==a&&!ja)return b.updateQueue=a.updateQueue,b.effectTag&=-517,a.expirationTime<=e&&(a.expirationTime=0),ma(a,b,e);b.effectTag|=1;N(a,b,d,e);return b.child}function ng(a,b,c,d,e,f){if(null===a){var g=c.type;if("function"===typeof g&&!Md(g)&&void 0===g.defaultProps&&null===c.compare&&void 0===c.defaultProps)return b.tag=15,b.type=g,og(a,b,g,d,e,f);a=wc(c.type,null,d,null,b.mode,f);a.ref=
 b.ref;a.return=b;return b.child=a}g=a.child;if(e<f&&(e=g.memoizedProps,c=c.compare,c=null!==c?c:vb,c(e,d)&&a.ref===b.ref))return ma(a,b,f);b.effectTag|=1;a=Ga(g,d,f);a.ref=b.ref;a.return=b;return b.child=a}function og(a,b,c,d,e,f){return null!==a&&vb(a.memoizedProps,d)&&a.ref===b.ref&&(ja=!1,e<f)?ma(a,b,f):be(a,b,c,d,f)}function pg(a,b){var c=b.ref;if(null===a&&null!==c||null!==a&&a.ref!==c)b.effectTag|=128}function be(a,b,c,d,e){var f=E(c)?Fa:F.current;f=Za(b,f);ib(b,e);c=Td(a,b,c,d,f,e);if(null!==
 a&&!ja)return b.updateQueue=a.updateQueue,b.effectTag&=-517,a.expirationTime<=e&&(a.expirationTime=0),ma(a,b,e);b.effectTag|=1;N(a,b,c,e);return b.child}function qg(a,b,c,d,e){if(E(c)){var f=!0;vc(b)}else f=!1;ib(b,e);if(null===b.stateNode)null!==a&&(a.alternate=null,b.alternate=null,b.effectTag|=2),Yf(b,c,d,e),Pd(b,c,d,e),d=!0;else if(null===a){var g=b.stateNode,h=b.memoizedProps;g.props=h;var l=g.context,k=c.contextType;"object"===typeof k&&null!==k?k=T(k):(k=E(c)?Fa:F.current,k=Za(b,k));var m=
 c.getDerivedStateFromProps,n="function"===typeof m||"function"===typeof g.getSnapshotBeforeUpdate;n||"function"!==typeof g.UNSAFE_componentWillReceiveProps&&"function"!==typeof g.componentWillReceiveProps||(h!==d||l!==k)&&Zf(b,g,d,k);za=!1;var p=b.memoizedState;l=g.state=p;var r=b.updateQueue;null!==r&&(Cb(b,r,d,g,e),l=b.memoizedState);h!==d||p!==l||M.current||za?("function"===typeof m&&(yc(b,c,m,d),l=b.memoizedState),(h=za||Xf(b,c,h,d,p,l,k))?(n||"function"!==typeof g.UNSAFE_componentWillMount&&
 "function"!==typeof g.componentWillMount||("function"===typeof g.componentWillMount&&g.componentWillMount(),"function"===typeof g.UNSAFE_componentWillMount&&g.UNSAFE_componentWillMount()),"function"===typeof g.componentDidMount&&(b.effectTag|=4)):("function"===typeof g.componentDidMount&&(b.effectTag|=4),b.memoizedProps=d,b.memoizedState=l),g.props=d,g.state=l,g.context=k,d=h):("function"===typeof g.componentDidMount&&(b.effectTag|=4),d=!1)}else g=b.stateNode,h=b.memoizedProps,g.props=b.type===b.elementType?
 h:P(b.type,h),l=g.context,k=c.contextType,"object"===typeof k&&null!==k?k=T(k):(k=E(c)?Fa:F.current,k=Za(b,k)),m=c.getDerivedStateFromProps,(n="function"===typeof m||"function"===typeof g.getSnapshotBeforeUpdate)||"function"!==typeof g.UNSAFE_componentWillReceiveProps&&"function"!==typeof g.componentWillReceiveProps||(h!==d||l!==k)&&Zf(b,g,d,k),za=!1,l=b.memoizedState,p=g.state=l,r=b.updateQueue,null!==r&&(Cb(b,r,d,g,e),p=b.memoizedState),h!==d||l!==p||M.current||za?("function"===typeof m&&(yc(b,
 c,m,d),p=b.memoizedState),(m=za||Xf(b,c,h,d,l,p,k))?(n||"function"!==typeof g.UNSAFE_componentWillUpdate&&"function"!==typeof g.componentWillUpdate||("function"===typeof g.componentWillUpdate&&g.componentWillUpdate(d,p,k),"function"===typeof g.UNSAFE_componentWillUpdate&&g.UNSAFE_componentWillUpdate(d,p,k)),"function"===typeof g.componentDidUpdate&&(b.effectTag|=4),"function"===typeof g.getSnapshotBeforeUpdate&&(b.effectTag|=256)):("function"!==typeof g.componentDidUpdate||h===a.memoizedProps&&l===
 a.memoizedState||(b.effectTag|=4),"function"!==typeof g.getSnapshotBeforeUpdate||h===a.memoizedProps&&l===a.memoizedState||(b.effectTag|=256),b.memoizedProps=d,b.memoizedState=p),g.props=d,g.state=p,g.context=k,d=m):("function"!==typeof g.componentDidUpdate||h===a.memoizedProps&&l===a.memoizedState||(b.effectTag|=4),"function"!==typeof g.getSnapshotBeforeUpdate||h===a.memoizedProps&&l===a.memoizedState||(b.effectTag|=256),d=!1);return ce(a,b,c,d,f,e)}function ce(a,b,c,d,e,f){pg(a,b);var g=0!==(b.effectTag&
 64);if(!d&&!g)return e&&Sf(b,c,!1),ma(a,b,f);d=b.stateNode;gi.current=b;var h=g&&"function"!==typeof c.getDerivedStateFromError?null:d.render();b.effectTag|=1;null!==a&&g?(b.child=hb(b,a.child,null,f),b.child=hb(b,null,h,f)):N(a,b,h,f);b.memoizedState=d.state;e&&Sf(b,c,!0);return b.child}function rg(a){var b=a.stateNode;b.pendingContext?Qf(a,b.pendingContext,b.pendingContext!==b.context):b.context&&Qf(a,b.context,!1);Qd(a,b.containerInfo)}function sg(a,b,c){var d=b.mode,e=b.pendingProps,f=b.memoizedState;
 if(0===(b.effectTag&64)){f=null;var g=!1}else f={timedOutAt:null!==f?f.timedOutAt:0},g=!0,b.effectTag&=-65;if(null===a)if(g){var h=e.fallback;a=wa(null,d,0,null);0===(b.mode&1)&&(a.child=null!==b.memoizedState?b.child.child:b.child);d=wa(h,d,c,null);a.sibling=d;c=a;c.return=d.return=b}else c=d=ae(b,null,e.children,c);else null!==a.memoizedState?(d=a.child,h=d.sibling,g?(c=e.fallback,e=Ga(d,d.pendingProps,0),0===(b.mode&1)&&(g=null!==b.memoizedState?b.child.child:b.child,g!==d.child&&(e.child=g)),
 d=e.sibling=Ga(h,c,h.expirationTime),c=e,e.childExpirationTime=0,c.return=d.return=b):c=d=hb(b,d.child,e.children,c)):(h=a.child,g?(g=e.fallback,e=wa(null,d,0,null),e.child=h,0===(b.mode&1)&&(e.child=null!==b.memoizedState?b.child.child:b.child),d=e.sibling=wa(g,d,c,null),d.effectTag|=2,c=e,e.childExpirationTime=0,c.return=d.return=b):d=c=hb(b,h,e.children,c)),b.stateNode=a.stateNode;b.memoizedState=f;b.child=c;return d}function ma(a,b,c){null!==a&&(b.contextDependencies=a.contextDependencies);if(b.childExpirationTime<
 c)return null;null!==a&&b.child!==a.child?n("153"):void 0;if(null!==b.child){a=b.child;c=Ga(a,a.pendingProps,a.expirationTime);b.child=c;for(c.return=b;null!==a.sibling;)a=a.sibling,c=c.sibling=Ga(a,a.pendingProps,a.expirationTime),c.return=b;c.sibling=null}return b.child}function hi(a,b,c){var d=b.expirationTime;if(null!==a)if(a.memoizedProps!==b.pendingProps||M.current)ja=!0;else{if(d<c){ja=!1;switch(b.tag){case 3:rg(b);$d();break;case 5:bg(b);break;case 1:E(b.type)&&vc(b);break;case 4:Qd(b,b.stateNode.containerInfo);
 break;case 10:tg(b,b.memoizedProps.value);break;case 13:if(null!==b.memoizedState){d=b.child.childExpirationTime;if(0!==d&&d>=c)return sg(a,b,c);b=ma(a,b,c);return null!==b?b.sibling:null}}return ma(a,b,c)}}else ja=!1;b.expirationTime=0;switch(b.tag){case 2:d=b.elementType;null!==a&&(a.alternate=null,b.alternate=null,b.effectTag|=2);a=b.pendingProps;var e=Za(b,F.current);ib(b,c);e=Td(null,b,d,a,e,c);b.effectTag|=1;if("object"===typeof e&&null!==e&&"function"===typeof e.render&&void 0===e.$$typeof){b.tag=
 1;Vd();if(E(d)){var f=!0;vc(b)}else f=!1;b.memoizedState=null!==e.state&&void 0!==e.state?e.state:null;var g=d.getDerivedStateFromProps;"function"===typeof g&&yc(b,d,g,a);e.updater=zc;b.stateNode=e;e._reactInternalFiber=b;Pd(b,d,a,c);b=ce(null,b,d,!0,f,c)}else b.tag=0,N(null,b,e,c),b=b.child;return b;case 16:e=b.elementType;null!==a&&(a.alternate=null,b.alternate=null,b.effectTag|=2);f=b.pendingProps;a=ei(e);b.type=a;e=b.tag=ci(a);f=P(a,f);g=void 0;switch(e){case 0:g=be(null,b,a,f,c);break;case 1:g=
 qg(null,b,a,f,c);break;case 11:g=mg(null,b,a,f,c);break;case 14:g=ng(null,b,a,P(a.type,f),d,c);break;default:n("306",a,"")}return g;case 0:return d=b.type,e=b.pendingProps,e=b.elementType===d?e:P(d,e),be(a,b,d,e,c);case 1:return d=b.type,e=b.pendingProps,e=b.elementType===d?e:P(d,e),qg(a,b,d,e,c);case 3:rg(b);d=b.updateQueue;null===d?n("282"):void 0;e=b.memoizedState;e=null!==e?e.element:null;Cb(b,d,b.pendingProps,null,c);d=b.memoizedState.element;if(d===e)$d(),b=ma(a,b,c);else{e=b.stateNode;if(e=
 (null===a||null===a.child)&&e.hydrate)gb=Pf(b.stateNode.containerInfo),la=b,e=Ia=!0;e?(b.effectTag|=2,b.child=ae(b,null,d,c)):(N(a,b,d,c),$d());b=b.child}return b;case 5:return bg(b),null===a&&kg(b),d=b.type,e=b.pendingProps,f=null!==a?a.memoizedProps:null,g=e.children,Gd(d,e)?g=null:null!==f&&Gd(d,f)&&(b.effectTag|=16),pg(a,b),1!==c&&b.mode&1&&e.hidden?(b.expirationTime=b.childExpirationTime=1,b=null):(N(a,b,g,c),b=b.child),b;case 6:return null===a&&kg(b),null;case 13:return sg(a,b,c);case 4:return Qd(b,
 b.stateNode.containerInfo),d=b.pendingProps,null===a?b.child=hb(b,null,d,c):N(a,b,d,c),b.child;case 11:return d=b.type,e=b.pendingProps,e=b.elementType===d?e:P(d,e),mg(a,b,d,e,c);case 7:return N(a,b,b.pendingProps,c),b.child;case 8:return N(a,b,b.pendingProps.children,c),b.child;case 12:return N(a,b,b.pendingProps.children,c),b.child;case 10:a:{d=b.type._context;e=b.pendingProps;g=b.memoizedProps;f=e.value;tg(b,f);if(null!==g){var h=g.value;f=Ea(h,f)?0:("function"===typeof d._calculateChangedBits?
 d._calculateChangedBits(h,f):1073741823)|0;if(0===f){if(g.children===e.children&&!M.current){b=ma(a,b,c);break a}}else for(h=b.child,null!==h&&(h.return=b);null!==h;){var l=h.contextDependencies;if(null!==l){g=h.child;for(var k=l.first;null!==k;){if(k.context===d&&0!==(k.observedBits&f)){1===h.tag&&(k=Aa(c),k.tag=Ec,na(h,k));h.expirationTime<c&&(h.expirationTime=c);k=h.alternate;null!==k&&k.expirationTime<c&&(k.expirationTime=c);k=c;for(var m=h.return;null!==m;){var p=m.alternate;if(m.childExpirationTime<
 k)m.childExpirationTime=k,null!==p&&p.childExpirationTime<k&&(p.childExpirationTime=k);else if(null!==p&&p.childExpirationTime<k)p.childExpirationTime=k;else break;m=m.return}l.expirationTime<c&&(l.expirationTime=c);break}k=k.next}}else g=10===h.tag?h.type===b.type?null:h.child:h.child;if(null!==g)g.return=h;else for(g=h;null!==g;){if(g===b){g=null;break}h=g.sibling;if(null!==h){h.return=g.return;g=h;break}g=g.return}h=g}}N(a,b,e.children,c);b=b.child}return b;case 9:return e=b.type,f=b.pendingProps,
 d=f.children,ib(b,c),e=T(e,f.unstable_observedBits),d=d(e),b.effectTag|=1,N(a,b,d,c),b.child;case 14:return e=b.type,f=P(e,b.pendingProps),f=P(e.type,f),ng(a,b,e,f,d,c);case 15:return og(a,b,b.type,b.pendingProps,d,c);case 17:return d=b.type,e=b.pendingProps,e=b.elementType===d?e:P(d,e),null!==a&&(a.alternate=null,b.alternate=null,b.effectTag|=2),b.tag=1,E(d)?(a=!0,vc(b)):a=!1,ib(b,c),Yf(b,d,e,c),Pd(b,d,e,c),ce(null,b,d,!0,a,c)}n("156")}function tg(a,b){var c=a.type._context;L(de,c._currentValue,
 a);c._currentValue=b}function ee(a){var b=de.current;D(de,a);a.type._context._currentValue=b}function ib(a,b){Nb=a;Ob=Ja=null;var c=a.contextDependencies;null!==c&&c.expirationTime>=b&&(ja=!0);a.contextDependencies=null}function T(a,b){if(Ob!==a&&!1!==b&&0!==b){if("number"!==typeof b||1073741823===b)Ob=a,b=1073741823;b={context:a,observedBits:b,next:null};null===Ja?(null===Nb?n("308"):void 0,Ja=b,Nb.contextDependencies={first:b,expirationTime:0}):Ja=Ja.next=b}return a._currentValue}function Fc(a){return{baseState:a,
 firstUpdate:null,lastUpdate:null,firstCapturedUpdate:null,lastCapturedUpdate:null,firstEffect:null,lastEffect:null,firstCapturedEffect:null,lastCapturedEffect:null}}function fe(a){return{baseState:a.baseState,firstUpdate:a.firstUpdate,lastUpdate:a.lastUpdate,firstCapturedUpdate:null,lastCapturedUpdate:null,firstEffect:null,lastEffect:null,firstCapturedEffect:null,lastCapturedEffect:null}}function Aa(a){return{expirationTime:a,tag:ug,payload:null,callback:null,next:null,nextEffect:null}}function Gc(a,
 b){null===a.lastUpdate?a.firstUpdate=a.lastUpdate=b:(a.lastUpdate.next=b,a.lastUpdate=b)}function na(a,b){var c=a.alternate;if(null===c){var d=a.updateQueue;var e=null;null===d&&(d=a.updateQueue=Fc(a.memoizedState))}else d=a.updateQueue,e=c.updateQueue,null===d?null===e?(d=a.updateQueue=Fc(a.memoizedState),e=c.updateQueue=Fc(c.memoizedState)):d=a.updateQueue=fe(e):null===e&&(e=c.updateQueue=fe(d));null===e||d===e?Gc(d,b):null===d.lastUpdate||null===e.lastUpdate?(Gc(d,b),Gc(e,b)):(Gc(d,b),e.lastUpdate=
 b)}function vg(a,b){var c=a.updateQueue;c=null===c?a.updateQueue=Fc(a.memoizedState):wg(a,c);null===c.lastCapturedUpdate?c.firstCapturedUpdate=c.lastCapturedUpdate=b:(c.lastCapturedUpdate.next=b,c.lastCapturedUpdate=b)}function wg(a,b){var c=a.alternate;null!==c&&b===c.updateQueue&&(b=a.updateQueue=fe(b));return b}function xg(a,b,c,d,e,f){switch(c.tag){case yg:return a=c.payload,"function"===typeof a?a.call(f,d,e):a;case ge:a.effectTag=a.effectTag&-2049|64;case ug:a=c.payload;e="function"===typeof a?
 a.call(f,d,e):a;if(null===e||void 0===e)break;return B({},d,e);case Ec:za=!0}return d}function Cb(a,b,c,d,e){za=!1;b=wg(a,b);for(var f=b.baseState,g=null,h=0,l=b.firstUpdate,k=f;null!==l;){var m=l.expirationTime;m<e?(null===g&&(g=l,f=k),h<m&&(h=m)):(k=xg(a,b,l,k,c,d),null!==l.callback&&(a.effectTag|=32,l.nextEffect=null,null===b.lastEffect?b.firstEffect=b.lastEffect=l:(b.lastEffect.nextEffect=l,b.lastEffect=l)));l=l.next}m=null;for(l=b.firstCapturedUpdate;null!==l;){var n=l.expirationTime;n<e?(null===
 m&&(m=l,null===g&&(f=k)),h<n&&(h=n)):(k=xg(a,b,l,k,c,d),null!==l.callback&&(a.effectTag|=32,l.nextEffect=null,null===b.lastCapturedEffect?b.firstCapturedEffect=b.lastCapturedEffect=l:(b.lastCapturedEffect.nextEffect=l,b.lastCapturedEffect=l)));l=l.next}null===g&&(b.lastUpdate=null);null===m?b.lastCapturedUpdate=null:a.effectTag|=32;null===g&&null===m&&(f=k);b.baseState=f;b.firstUpdate=g;b.firstCapturedUpdate=m;a.expirationTime=h;a.memoizedState=k}function zg(a,b,c,d){null!==b.firstCapturedUpdate&&
 (null!==b.lastUpdate&&(b.lastUpdate.next=b.firstCapturedUpdate,b.lastUpdate=b.lastCapturedUpdate),b.firstCapturedUpdate=b.lastCapturedUpdate=null);Ag(b.firstEffect,c);b.firstEffect=b.lastEffect=null;Ag(b.firstCapturedEffect,c);b.firstCapturedEffect=b.lastCapturedEffect=null}function Ag(a,b){for(;null!==a;){var c=a.callback;if(null!==c){a.callback=null;var d=b;"function"!==typeof c?n("191",c):void 0;c.call(d)}a=a.nextEffect}}function Hc(a,b){return{value:a,source:b,stack:qd(b)}}function Pb(a){a.effectTag|=
 4}function Bg(a,b){var c=b.source,d=b.stack;null===d&&null!==c&&(d=qd(c));null!==c&&sa(c.type);b=b.value;null!==a&&1===a.tag&&sa(a.type);try{console.error(b)}catch(e){setTimeout(function(){throw e;})}}function Cg(a){var b=a.ref;if(null!==b)if("function"===typeof b)try{b(null)}catch(c){Ka(a,c)}else b.current=null}function Qb(a,b,c){c=c.updateQueue;c=null!==c?c.lastEffect:null;if(null!==c){var d=c=c.next;do{if((d.tag&a)!==db){var e=d.destroy;d.destroy=void 0;void 0!==e&&e()}(d.tag&b)!==db&&(e=d.create,
 d.destroy=e());d=d.next}while(d!==c)}}function ii(a,b){for(var c=a;;){if(5===c.tag){var d=c.stateNode;if(b)d.style.display="none";else{d=c.stateNode;var e=c.memoizedProps.style;e=void 0!==e&&null!==e&&e.hasOwnProperty("display")?e.display:null;d.style.display=Lf("display",e)}}else if(6===c.tag)c.stateNode.nodeValue=b?"":c.memoizedProps;else if(13===c.tag&&null!==c.memoizedState){d=c.child.sibling;d.return=c;c=d;continue}else if(null!==c.child){c.child.return=c;c=c.child;continue}if(c===a)break;for(;null===
 c.sibling;){if(null===c.return||c.return===a)return;c=c.return}c.sibling.return=c.return;c=c.sibling}}function Dg(a){"function"===typeof Ld&&Ld(a);switch(a.tag){case 0:case 11:case 14:case 15:var b=a.updateQueue;if(null!==b&&(b=b.lastEffect,null!==b)){var c=b=b.next;do{var d=c.destroy;if(void 0!==d){var e=a;try{d()}catch(f){Ka(e,f)}}c=c.next}while(c!==b)}break;case 1:Cg(a);b=a.stateNode;if("function"===typeof b.componentWillUnmount)try{b.props=a.memoizedProps,b.state=a.memoizedState,b.componentWillUnmount()}catch(f){Ka(a,
 f)}break;case 5:Cg(a);break;case 4:Eg(a)}}function Fg(a){return 5===a.tag||3===a.tag||4===a.tag}function Gg(a){a:{for(var b=a.return;null!==b;){if(Fg(b)){var c=b;break a}b=b.return}n("160");c=void 0}var d=b=void 0;switch(c.tag){case 5:b=c.stateNode;d=!1;break;case 3:b=c.stateNode.containerInfo;d=!0;break;case 4:b=c.stateNode.containerInfo;d=!0;break;default:n("161")}c.effectTag&16&&(Ab(b,""),c.effectTag&=-17);a:b:for(c=a;;){for(;null===c.sibling;){if(null===c.return||Fg(c.return)){c=null;break a}c=
 c.return}c.sibling.return=c.return;for(c=c.sibling;5!==c.tag&&6!==c.tag&&18!==c.tag;){if(c.effectTag&2)continue b;if(null===c.child||4===c.tag)continue b;else c.child.return=c,c=c.child}if(!(c.effectTag&2)){c=c.stateNode;break a}}for(var e=a;;){if(5===e.tag||6===e.tag)if(c)if(d){var f=b,g=e.stateNode,h=c;8===f.nodeType?f.parentNode.insertBefore(g,h):f.insertBefore(g,h)}else b.insertBefore(e.stateNode,c);else d?(g=b,h=e.stateNode,8===g.nodeType?(f=g.parentNode,f.insertBefore(h,g)):(f=g,f.appendChild(h)),
 g=g._reactRootContainer,null!==g&&void 0!==g||null!==f.onclick||(f.onclick=tc)):b.appendChild(e.stateNode);else if(4!==e.tag&&null!==e.child){e.child.return=e;e=e.child;continue}if(e===a)break;for(;null===e.sibling;){if(null===e.return||e.return===a)return;e=e.return}e.sibling.return=e.return;e=e.sibling}}function Eg(a){for(var b=a,c=!1,d=void 0,e=void 0;;){if(!c){c=b.return;a:for(;;){null===c?n("160"):void 0;switch(c.tag){case 5:d=c.stateNode;e=!1;break a;case 3:d=c.stateNode.containerInfo;e=!0;
 break a;case 4:d=c.stateNode.containerInfo;e=!0;break a}c=c.return}c=!0}if(5===b.tag||6===b.tag){a:for(var f=b,g=f;;)if(Dg(g),null!==g.child&&4!==g.tag)g.child.return=g,g=g.child;else{if(g===f)break;for(;null===g.sibling;){if(null===g.return||g.return===f)break a;g=g.return}g.sibling.return=g.return;g=g.sibling}e?(f=d,g=b.stateNode,8===f.nodeType?f.parentNode.removeChild(g):f.removeChild(g)):d.removeChild(b.stateNode)}else if(4===b.tag){if(null!==b.child){d=b.stateNode.containerInfo;e=!0;b.child.return=
 b;b=b.child;continue}}else if(Dg(b),null!==b.child){b.child.return=b;b=b.child;continue}if(b===a)break;for(;null===b.sibling;){if(null===b.return||b.return===a)return;b=b.return;4===b.tag&&(c=!1)}b.sibling.return=b.return;b=b.sibling}}function Hg(a,b){switch(b.tag){case 0:case 11:case 14:case 15:Qb(Rb,ji,b);break;case 1:break;case 5:var c=b.stateNode;if(null!=c){var d=b.memoizedProps;a=null!==a?a.memoizedProps:d;var e=b.type,f=b.updateQueue;b.updateQueue=null;null!==f&&$h(c,f,e,a,d,b)}break;case 6:null===
 b.stateNode?n("162"):void 0;b.stateNode.nodeValue=b.memoizedProps;break;case 3:break;case 12:break;case 13:c=b.memoizedState;d=void 0;a=b;null===c?d=!1:(d=!0,a=b.child,0===c.timedOutAt&&(c.timedOutAt=ka()));null!==a&&ii(a,d);c=b.updateQueue;if(null!==c){b.updateQueue=null;var g=b.stateNode;null===g&&(g=b.stateNode=new ki);c.forEach(function(a){var c=li.bind(null,b,a);g.has(a)||(g.add(a),a.then(c,c))})}break;case 17:break;default:n("163")}}function he(a,b,c){c=Aa(c);c.tag=ge;c.payload={element:null};
 var d=b.value;c.callback=function(){ie(d);Bg(a,b)};return c}function Ig(a,b,c){c=Aa(c);c.tag=ge;var d=a.type.getDerivedStateFromError;if("function"===typeof d){var e=b.value;c.payload=function(){return d(e)}}var f=a.stateNode;null!==f&&"function"===typeof f.componentDidCatch&&(c.callback=function(){"function"!==typeof d&&(null===Ba?Ba=new Set([this]):Ba.add(this));var c=b.value,e=b.stack;Bg(a,b);this.componentDidCatch(c,{componentStack:null!==e?e:""})});return c}function mi(a,b){switch(a.tag){case 1:return E(a.type)&&
 uc(a),b=a.effectTag,b&2048?(a.effectTag=b&-2049|64,a):null;case 3:return $a(a),Jd(a),b=a.effectTag,0!==(b&64)?n("285"):void 0,a.effectTag=b&-2049|64,a;case 5:return Rd(a),null;case 13:return b=a.effectTag,b&2048?(a.effectTag=b&-2049|64,a):null;case 18:return null;case 4:return $a(a),null;case 10:return ee(a),null;default:return null}}function Jg(){if(null!==x)for(var a=x.return;null!==a;){var b=a;switch(b.tag){case 1:var c=b.type.childContextTypes;null!==c&&void 0!==c&&uc(b);break;case 3:$a(b);Jd(b);
 break;case 5:Rd(b);break;case 4:$a(b);break;case 10:ee(b)}a=a.return}Y=null;H=0;La=-1;je=!1;x=null}function ni(){for(;null!==p;){var a=p.effectTag;a&16&&Ab(p.stateNode,"");if(a&128){var b=p.alternate;null!==b&&(b=b.ref,null!==b&&("function"===typeof b?b(null):b.current=null))}switch(a&14){case 2:Gg(p);p.effectTag&=-3;break;case 6:Gg(p);p.effectTag&=-3;Hg(p.alternate,p);break;case 4:Hg(p.alternate,p);break;case 8:a=p,Eg(a),a.return=null,a.child=null,a.memoizedState=null,a.updateQueue=null,a=a.alternate,
 null!==a&&(a.return=null,a.child=null,a.memoizedState=null,a.updateQueue=null)}p=p.nextEffect}}function oi(){for(;null!==p;){if(p.effectTag&256)a:{var a=p.alternate,b=p;switch(b.tag){case 0:case 11:case 15:Qb(pi,db,b);break a;case 1:if(b.effectTag&256&&null!==a){var c=a.memoizedProps,d=a.memoizedState;a=b.stateNode;b=a.getSnapshotBeforeUpdate(b.elementType===b.type?c:P(b.type,c),d);a.__reactInternalSnapshotBeforeUpdate=b}break a;case 3:case 5:case 6:case 4:case 17:break a;default:n("163")}}p=p.nextEffect}}
 function qi(a,b){for(;null!==p;){var c=p.effectTag;if(c&36){var d=p.alternate,e=p,f=b;switch(e.tag){case 0:case 11:case 15:Qb(ri,Sb,e);break;case 1:var g=e.stateNode;if(e.effectTag&4)if(null===d)g.componentDidMount();else{var h=e.elementType===e.type?d.memoizedProps:P(e.type,d.memoizedProps);g.componentDidUpdate(h,d.memoizedState,g.__reactInternalSnapshotBeforeUpdate)}d=e.updateQueue;null!==d&&zg(e,d,g,f);break;case 3:d=e.updateQueue;if(null!==d){g=null;if(null!==e.child)switch(e.child.tag){case 5:g=
 e.child.stateNode;break;case 1:g=e.child.stateNode}zg(e,d,g,f)}break;case 5:f=e.stateNode;null===d&&e.effectTag&4&&Nf(e.type,e.memoizedProps)&&f.focus();break;case 6:break;case 4:break;case 12:break;case 13:break;case 17:break;default:n("163")}}c&128&&(e=p.ref,null!==e&&(f=p.stateNode,"function"===typeof e?e(f):e.current=f));c&512&&(ke=a);p=p.nextEffect}}function si(a,b){Ic=Jc=ke=null;var c=w;w=!0;do{if(b.effectTag&512){var d=!1,e=void 0;try{var f=b;Qb(le,db,f);Qb(db,me,f)}catch(g){d=!0,e=g}d&&Ka(b,
 e)}b=b.nextEffect}while(null!==b);w=c;c=a.expirationTime;0!==c&&Kc(a,c);z||w||Z(1073741823,!1)}function eb(){null!==Jc&&ti(Jc);null!==Ic&&Ic()}function ui(a,b){Lc=Ca=!0;a.current===b?n("177"):void 0;var c=a.pendingCommitExpirationTime;0===c?n("261"):void 0;a.pendingCommitExpirationTime=0;var d=b.expirationTime,e=b.childExpirationTime;di(a,e>d?e:d);Kg.current=null;d=void 0;1<b.effectTag?null!==b.lastEffect?(b.lastEffect.nextEffect=b,d=b.firstEffect):d=b:d=b.firstEffect;ne=qc;oe=Wh();qc=!1;for(p=d;null!==
 p;){e=!1;var f=void 0;try{oi()}catch(h){e=!0,f=h}e&&(null===p?n("178"):void 0,Ka(p,f),null!==p&&(p=p.nextEffect))}for(p=d;null!==p;){e=!1;f=void 0;try{ni()}catch(h){e=!0,f=h}e&&(null===p?n("178"):void 0,Ka(p,f),null!==p&&(p=p.nextEffect))}Xh(oe);oe=null;qc=!!ne;ne=null;a.current=b;for(p=d;null!==p;){e=!1;f=void 0;try{qi(a,c)}catch(h){e=!0,f=h}e&&(null===p?n("178"):void 0,Ka(p,f),null!==p&&(p=p.nextEffect))}if(null!==d&&null!==ke){var g=si.bind(null,a,d);Jc=Mc(Lg,function(){return vi(g)});Ic=g}Ca=
 Lc=!1;"function"===typeof Kd&&Kd(b.stateNode);c=b.expirationTime;b=b.childExpirationTime;b=b>c?b:c;0===b&&(Ba=null);wi(a,b)}function Mg(a){for(;;){var b=a.alternate,c=a.return,d=a.sibling;if(0===(a.effectTag&1024)){x=a;a:{var e=b;b=a;var f=H;var g=b.pendingProps;switch(b.tag){case 2:break;case 16:break;case 15:case 0:break;case 1:E(b.type)&&uc(b);break;case 3:$a(b);Jd(b);g=b.stateNode;g.pendingContext&&(g.context=g.pendingContext,g.pendingContext=null);if(null===e||null===e.child)Zd(b),b.effectTag&=
 -3;pe(b);break;case 5:Rd(b);var h=Ha(Fb.current);f=b.type;if(null!==e&&null!=b.stateNode)Ng(e,b,f,g,h),e.ref!==b.ref&&(b.effectTag|=128);else if(g){var l=Ha(U.current);if(Zd(b)){g=b;e=g.stateNode;var k=g.type,m=g.memoizedProps,p=h;e[ea]=g;e[ec]=m;f=void 0;h=k;switch(h){case "iframe":case "object":r("load",e);break;case "video":case "audio":for(k=0;k<zb.length;k++)r(zb[k],e);break;case "source":r("error",e);break;case "img":case "image":case "link":r("error",e);r("load",e);break;case "form":r("reset",
 e);r("submit",e);break;case "details":r("toggle",e);break;case "input":lf(e,m);r("invalid",e);ha(p,"onChange");break;case "select":e._wrapperState={wasMultiple:!!m.multiple};r("invalid",e);ha(p,"onChange");break;case "textarea":If(e,m),r("invalid",e),ha(p,"onChange")}Ed(h,m);k=null;for(f in m)m.hasOwnProperty(f)&&(l=m[f],"children"===f?"string"===typeof l?e.textContent!==l&&(k=["children",l]):"number"===typeof l&&e.textContent!==""+l&&(k=["children",""+l]):Oa.hasOwnProperty(f)&&null!=l&&ha(p,f));
 switch(h){case "input":kc(e);nf(e,m,!0);break;case "textarea":kc(e);f=e.textContent;f===e._wrapperState.initialValue&&(e.value=f);break;case "select":case "option":break;default:"function"===typeof m.onClick&&(e.onclick=tc)}f=k;g.updateQueue=f;g=null!==f?!0:!1;g&&Pb(b)}else{m=b;p=f;e=g;k=9===h.nodeType?h:h.ownerDocument;"http://www.w3.org/1999/xhtml"===l&&(l=Kf(p));"http://www.w3.org/1999/xhtml"===l?"script"===p?(e=k.createElement("div"),e.innerHTML="<script>\x3c/script>",k=e.removeChild(e.firstChild)):
 "string"===typeof e.is?k=k.createElement(p,{is:e.is}):(k=k.createElement(p),"select"===p&&(p=k,e.multiple?p.multiple=!0:e.size&&(p.size=e.size))):k=k.createElementNS(l,p);e=k;e[ea]=m;e[ec]=g;Og(e,b,!1,!1);m=e;k=f;p=g;var t=h,y=Fd(k,p);switch(k){case "iframe":case "object":r("load",m);h=p;break;case "video":case "audio":for(h=0;h<zb.length;h++)r(zb[h],m);h=p;break;case "source":r("error",m);h=p;break;case "img":case "image":case "link":r("error",m);r("load",m);h=p;break;case "form":r("reset",m);r("submit",
 m);h=p;break;case "details":r("toggle",m);h=p;break;case "input":lf(m,p);h=sd(m,p);r("invalid",m);ha(t,"onChange");break;case "option":h=Bd(m,p);break;case "select":m._wrapperState={wasMultiple:!!p.multiple};h=B({},p,{value:void 0});r("invalid",m);ha(t,"onChange");break;case "textarea":If(m,p);h=Cd(m,p);r("invalid",m);ha(t,"onChange");break;default:h=p}Ed(k,h);l=void 0;var u=k,w=m,v=h;for(l in v)if(v.hasOwnProperty(l)){var q=v[l];"style"===l?Mf(w,q):"dangerouslySetInnerHTML"===l?(q=q?q.__html:void 0,
 null!=q&&Of(w,q)):"children"===l?"string"===typeof q?("textarea"!==u||""!==q)&&Ab(w,q):"number"===typeof q&&Ab(w,""+q):"suppressContentEditableWarning"!==l&&"suppressHydrationWarning"!==l&&"autoFocus"!==l&&(Oa.hasOwnProperty(l)?null!=q&&ha(t,l):null!=q&&rd(w,l,q,y))}switch(k){case "input":kc(m);nf(m,p,!1);break;case "textarea":kc(m);h=m.textContent;h===m._wrapperState.initialValue&&(m.value=h);break;case "option":null!=p.value&&m.setAttribute("value",""+ua(p.value));break;case "select":h=m;m=p;h.multiple=
 !!m.multiple;p=m.value;null!=p?Xa(h,!!m.multiple,p,!1):null!=m.defaultValue&&Xa(h,!!m.multiple,m.defaultValue,!0);break;default:"function"===typeof h.onClick&&(m.onclick=tc)}(g=Nf(f,g))&&Pb(b);b.stateNode=e}null!==b.ref&&(b.effectTag|=128)}else null===b.stateNode?n("166"):void 0;break;case 6:e&&null!=b.stateNode?Pg(e,b,e.memoizedProps,g):("string"!==typeof g&&(null===b.stateNode?n("166"):void 0),e=Ha(Fb.current),Ha(U.current),Zd(b)?(g=b,f=g.stateNode,e=g.memoizedProps,f[ea]=g,(g=f.nodeValue!==e)&&
 Pb(b)):(f=b,g=(9===e.nodeType?e:e.ownerDocument).createTextNode(g),g[ea]=b,f.stateNode=g));break;case 11:break;case 13:g=b.memoizedState;if(0!==(b.effectTag&64)){b.expirationTime=f;x=b;break a}g=null!==g;f=null!==e&&null!==e.memoizedState;null!==e&&!g&&f&&(e=e.child.sibling,null!==e&&(h=b.firstEffect,null!==h?(b.firstEffect=e,e.nextEffect=h):(b.firstEffect=b.lastEffect=e,e.nextEffect=null),e.effectTag=8));if(g||f)b.effectTag|=4;break;case 7:break;case 8:break;case 12:break;case 4:$a(b);pe(b);break;
 case 10:ee(b);break;case 9:break;case 14:break;case 17:E(b.type)&&uc(b);break;case 18:break;default:n("156")}x=null}b=a;if(1===H||1!==b.childExpirationTime){g=0;for(f=b.child;null!==f;)e=f.expirationTime,h=f.childExpirationTime,e>g&&(g=e),h>g&&(g=h),f=f.sibling;b.childExpirationTime=g}if(null!==x)return x;null!==c&&0===(c.effectTag&1024)&&(null===c.firstEffect&&(c.firstEffect=a.firstEffect),null!==a.lastEffect&&(null!==c.lastEffect&&(c.lastEffect.nextEffect=a.firstEffect),c.lastEffect=a.lastEffect),
 1<a.effectTag&&(null!==c.lastEffect?c.lastEffect.nextEffect=a:c.firstEffect=a,c.lastEffect=a))}else{a=mi(a,H);if(null!==a)return a.effectTag&=1023,a;null!==c&&(c.firstEffect=c.lastEffect=null,c.effectTag|=1024)}if(null!==d)return d;if(null!==c)a=c;else break}return null}function Qg(a){var b=hi(a.alternate,a,H);a.memoizedProps=a.pendingProps;null===b&&(b=Mg(a));Kg.current=null;return b}function Rg(a,b){Ca?n("243"):void 0;eb();Ca=!0;var c=qe.current;qe.current=Ud;var d=a.nextExpirationTimeToWorkOn;
 if(d!==H||a!==Y||null===x)Jg(),Y=a,H=d,x=Ga(Y.current,null,H),a.pendingCommitExpirationTime=0;var e=!1;do{try{if(b)for(;null!==x&&!Nc();)x=Qg(x);else for(;null!==x;)x=Qg(x)}catch(v){if(Ob=Ja=Nb=null,Vd(),null===x)e=!0,ie(v);else{null===x?n("271"):void 0;var f=x,g=f.return;if(null===g)e=!0,ie(v);else{a:{var h=a,l=g,k=f,m=v;g=H;k.effectTag|=1024;k.firstEffect=k.lastEffect=null;if(null!==m&&"object"===typeof m&&"function"===typeof m.then){var p=m;m=l;var t=-1,r=-1;do{if(13===m.tag){var u=m.alternate;
 if(null!==u&&(u=u.memoizedState,null!==u)){r=10*(1073741822-u.timedOutAt);break}u=m.pendingProps.maxDuration;if("number"===typeof u)if(0>=u)t=0;else if(-1===t||u<t)t=u}m=m.return}while(null!==m);m=l;do{if(u=13===m.tag)u=void 0===m.memoizedProps.fallback?!1:null===m.memoizedState;if(u){l=m.updateQueue;null===l?(l=new Set,l.add(p),m.updateQueue=l):l.add(p);if(0===(m.mode&1)){m.effectTag|=64;k.effectTag&=-1957;1===k.tag&&(null===k.alternate?k.tag=17:(g=Aa(1073741823),g.tag=Ec,na(k,g)));k.expirationTime=
 1073741823;break a}k=h;l=g;var w=k.pingCache;null===w?(w=k.pingCache=new xi,u=new Set,w.set(p,u)):(u=w.get(p),void 0===u&&(u=new Set,w.set(p,u)));u.has(l)||(u.add(l),k=yi.bind(null,k,p,l),p.then(k,k));-1===t?h=1073741823:(-1===r&&(r=10*(1073741822-Wf(h,g))-5E3),h=r+t);0<=h&&La<h&&(La=h);m.effectTag|=2048;m.expirationTime=g;break a}m=m.return}while(null!==m);m=Error((sa(k.type)||"A React component")+" suspended while rendering, but no fallback UI was specified.\n\nAdd a <Suspense fallback=...> component higher in the tree to provide a loading indicator or placeholder to display."+
 qd(k))}je=!0;m=Hc(m,k);h=l;do{switch(h.tag){case 3:h.effectTag|=2048;h.expirationTime=g;g=he(h,m,g);vg(h,g);break a;case 1:if(t=m,r=h.type,k=h.stateNode,0===(h.effectTag&64)&&("function"===typeof r.getDerivedStateFromError||null!==k&&"function"===typeof k.componentDidCatch&&(null===Ba||!Ba.has(k)))){h.effectTag|=2048;h.expirationTime=g;g=Ig(h,t,g);vg(h,g);break a}}h=h.return}while(null!==h)}x=Mg(f);continue}}}break}while(1);Ca=!1;qe.current=c;Ob=Ja=Nb=null;Vd();if(e)Y=null,a.finishedWork=null;else if(null!==
 x)a.finishedWork=null;else{c=a.current.alternate;null===c?n("281"):void 0;Y=null;if(je){e=a.latestPendingTime;f=a.latestSuspendedTime;g=a.latestPingedTime;if(0!==e&&e<d||0!==f&&f<d||0!==g&&g<d){Vf(a,d);re(a,c,d,a.expirationTime,-1);return}if(!a.didError&&b){a.didError=!0;d=a.nextExpirationTimeToWorkOn=d;b=a.expirationTime=1073741823;re(a,c,d,b,-1);return}}b&&-1!==La?(Vf(a,d),b=10*(1073741822-Wf(a,d)),b<La&&(La=b),b=10*(1073741822-ka()),b=La-b,re(a,c,d,a.expirationTime,0>b?0:b)):(a.pendingCommitExpirationTime=
 d,a.finishedWork=c)}}function Ka(a,b){for(var c=a.return;null!==c;){switch(c.tag){case 1:var d=c.stateNode;if("function"===typeof c.type.getDerivedStateFromError||"function"===typeof d.componentDidCatch&&(null===Ba||!Ba.has(d))){a=Hc(b,a);a=Ig(c,a,1073741823);na(c,a);ya(c,1073741823);return}break;case 3:a=Hc(b,a);a=he(c,a,1073741823);na(c,a);ya(c,1073741823);return}c=c.return}3===a.tag&&(c=Hc(b,a),c=he(a,c,1073741823),na(a,c),ya(a,1073741823))}function fb(a,b){var c=zi(),d=void 0;if(0===(b.mode&1))d=
 1073741823;else if(Ca&&!Lc)d=H;else{switch(c){case se:d=1073741823;break;case te:d=1073741822-10*(((1073741822-a+15)/10|0)+1);break;case Lg:d=1073741822-25*(((1073741822-a+500)/25|0)+1);break;case Ai:case Bi:d=1;break;default:n("313")}null!==Y&&d===H&&--d}c===te&&(0===oa||d<oa)&&(oa=d);return d}function yi(a,b,c){var d=a.pingCache;null!==d&&d.delete(b);if(null!==Y&&H===c)Y=null;else if(b=a.earliestSuspendedTime,d=a.latestSuspendedTime,0!==b&&c<=b&&c>=d){a.didError=!1;b=a.latestPingedTime;if(0===b||
 b>c)a.latestPingedTime=c;xc(c,a);c=a.expirationTime;0!==c&&Kc(a,c)}}function li(a,b){var c=a.stateNode;null!==c&&c.delete(b);b=ka();b=fb(b,a);a=Sg(a,b);null!==a&&(Bb(a,b),b=a.expirationTime,0!==b&&Kc(a,b))}function Sg(a,b){a.expirationTime<b&&(a.expirationTime=b);var c=a.alternate;null!==c&&c.expirationTime<b&&(c.expirationTime=b);var d=a.return,e=null;if(null===d&&3===a.tag)e=a.stateNode;else for(;null!==d;){c=d.alternate;d.childExpirationTime<b&&(d.childExpirationTime=b);null!==c&&c.childExpirationTime<
 b&&(c.childExpirationTime=b);if(null===d.return&&3===d.tag){e=d.stateNode;break}d=d.return}return e}function ya(a,b){a=Sg(a,b);null!==a&&(!Ca&&0!==H&&b>H&&Jg(),Bb(a,b),Ca&&!Lc&&Y===a||Kc(a,a.expirationTime),Tb>Ci&&(Tb=0,n("185")))}function Tg(a,b,c,d,e){return Mc(se,function(){return a(b,c,d,e)})}function Ub(){aa=1073741822-((ue()-ve)/10|0)}function Ug(a,b){if(0!==Oc){if(b<Oc)return;null!==Pc&&Vg(Pc)}Oc=b;a=ue()-ve;Pc=Wg(Di,{timeout:10*(1073741822-b)-a})}function re(a,b,c,d,e){a.expirationTime=d;
 0!==e||Nc()?0<e&&(a.timeoutHandle=Ei(Fi.bind(null,a,b,c),e)):(a.pendingCommitExpirationTime=c,a.finishedWork=b)}function Fi(a,b,c){a.pendingCommitExpirationTime=c;a.finishedWork=b;Ub();jb=aa;Xg(a,c)}function wi(a,b){a.expirationTime=b;a.finishedWork=null}function ka(){if(w)return jb;Qc();if(0===C||1===C)Ub(),jb=aa;return jb}function Kc(a,b){null===a.nextScheduledRoot?(a.expirationTime=b,null===I?(ba=I=a,a.nextScheduledRoot=a):(I=I.nextScheduledRoot=a,I.nextScheduledRoot=ba)):b>a.expirationTime&&(a.expirationTime=
 b);w||(z?Rc&&(ca=a,C=1073741823,Sc(a,1073741823,!1)):1073741823===b?Z(1073741823,!1):Ug(a,b))}function Qc(){var a=0,b=null;if(null!==I)for(var c=I,d=ba;null!==d;){var e=d.expirationTime;if(0===e){null===c||null===I?n("244"):void 0;if(d===d.nextScheduledRoot){ba=I=d.nextScheduledRoot=null;break}else if(d===ba)ba=e=d.nextScheduledRoot,I.nextScheduledRoot=e,d.nextScheduledRoot=null;else if(d===I){I=c;I.nextScheduledRoot=ba;d.nextScheduledRoot=null;break}else c.nextScheduledRoot=d.nextScheduledRoot,d.nextScheduledRoot=
 null;d=c.nextScheduledRoot}else{e>a&&(a=e,b=d);if(d===I)break;if(1073741823===a)break;c=d;d=d.nextScheduledRoot}}ca=b;C=a}function Nc(){return Tc?!0:Gi()?Tc=!0:!1}function Di(){try{if(!Nc()&&null!==ba){Ub();var a=ba;do{var b=a.expirationTime;0!==b&&aa<=b&&(a.nextExpirationTimeToWorkOn=aa);a=a.nextScheduledRoot}while(a!==ba)}Z(0,!0)}finally{Tc=!1}}function Z(a,b){Qc();if(b)for(Ub(),jb=aa;null!==ca&&0!==C&&a<=C&&!(Tc&&aa>C);)Sc(ca,C,aa>C),Qc(),Ub(),jb=aa;else for(;null!==ca&&0!==C&&a<=C;)Sc(ca,C,!1),
 Qc();b&&(Oc=0,Pc=null);0!==C&&Ug(ca,C);Tb=0;we=null;if(null!==kb)for(a=kb,kb=null,b=0;b<a.length;b++){var c=a[b];try{c._onComplete()}catch(d){lb||(lb=!0,Uc=d)}}if(lb)throw a=Uc,Uc=null,lb=!1,a;}function Xg(a,b){w?n("253"):void 0;ca=a;C=b;Sc(a,b,!1);Z(1073741823,!1)}function Sc(a,b,c){w?n("245"):void 0;w=!0;if(c){var d=a.finishedWork;null!==d?Vc(a,d,b):(a.finishedWork=null,d=a.timeoutHandle,-1!==d&&(a.timeoutHandle=-1,Yg(d)),Rg(a,c),d=a.finishedWork,null!==d&&(Nc()?a.finishedWork=d:Vc(a,d,b)))}else d=
 a.finishedWork,null!==d?Vc(a,d,b):(a.finishedWork=null,d=a.timeoutHandle,-1!==d&&(a.timeoutHandle=-1,Yg(d)),Rg(a,c),d=a.finishedWork,null!==d&&Vc(a,d,b));w=!1}function Vc(a,b,c){var d=a.firstBatch;if(null!==d&&d._expirationTime>=c&&(null===kb?kb=[d]:kb.push(d),d._defer)){a.finishedWork=b;a.expirationTime=0;return}a.finishedWork=null;a===we?Tb++:(we=a,Tb=0);Mc(se,function(){ui(a,b)})}function ie(a){null===ca?n("246"):void 0;ca.expirationTime=0;lb||(lb=!0,Uc=a)}function Zg(a,b){var c=z;z=!0;try{return a(b)}finally{(z=
 c)||w||Z(1073741823,!1)}}function $g(a,b){if(z&&!Rc){Rc=!0;try{return a(b)}finally{Rc=!1}}return a(b)}function ah(a,b,c){z||w||0===oa||(Z(oa,!1),oa=0);var d=z;z=!0;try{return Mc(te,function(){return a(b,c)})}finally{(z=d)||w||Z(1073741823,!1)}}function bh(a,b,c,d,e){var f=b.current;a:if(c){c=c._reactInternalFiber;b:{2===wb(c)&&1===c.tag?void 0:n("170");var g=c;do{switch(g.tag){case 3:g=g.stateNode.context;break b;case 1:if(E(g.type)){g=g.stateNode.__reactInternalMemoizedMergedChildContext;break b}}g=
 g.return}while(null!==g);n("171");g=void 0}if(1===c.tag){var h=c.type;if(E(h)){c=Rf(c,h,g);break a}}c=g}else c=va;null===b.context?b.context=c:b.pendingContext=c;b=e;e=Aa(d);e.payload={element:a};b=void 0===b?null:b;null!==b&&(e.callback=b);eb();na(f,e);ya(f,d);return d}function xe(a,b,c,d){var e=b.current,f=ka();e=fb(f,e);return bh(a,b,c,e,d)}function ye(a){a=a.current;if(!a.child)return null;switch(a.child.tag){case 5:return a.child.stateNode;default:return a.child.stateNode}}function Hi(a,b,c){var d=
 3<arguments.length&&void 0!==arguments[3]?arguments[3]:null;return{$$typeof:Va,key:null==d?null:""+d,children:a,containerInfo:b,implementation:c}}function Vb(a){var b=1073741822-25*(((1073741822-ka()+500)/25|0)+1);b>=ze&&(b=ze-1);this._expirationTime=ze=b;this._root=a;this._callbacks=this._next=null;this._hasChildren=this._didComplete=!1;this._children=null;this._defer=!0}function mb(){this._callbacks=null;this._didCommit=!1;this._onCommit=this._onCommit.bind(this)}function nb(a,b,c){b=S(3,null,null,
 b?3:0);a={current:b,containerInfo:a,pendingChildren:null,pingCache:null,earliestPendingTime:0,latestPendingTime:0,earliestSuspendedTime:0,latestSuspendedTime:0,latestPingedTime:0,didError:!1,pendingCommitExpirationTime:0,finishedWork:null,timeoutHandle:-1,context:null,pendingContext:null,hydrate:c,nextExpirationTimeToWorkOn:0,expirationTime:0,firstBatch:null,nextScheduledRoot:null};this._internalRoot=b.stateNode=a}function ob(a){return!(!a||1!==a.nodeType&&9!==a.nodeType&&11!==a.nodeType&&(8!==a.nodeType||
 " react-mount-point-unstable "!==a.nodeValue))}function Ii(a,b){b||(b=a?9===a.nodeType?a.documentElement:a.firstChild:null,b=!(!b||1!==b.nodeType||!b.hasAttribute("data-reactroot")));if(!b)for(var c;c=a.lastChild;)a.removeChild(c);return new nb(a,!1,b)}function Wc(a,b,c,d,e){var f=c._reactRootContainer;if(f){if("function"===typeof e){var g=e;e=function(){var a=ye(f._internalRoot);g.call(a)}}null!=a?f.legacy_renderSubtreeIntoContainer(a,b,e):f.render(b,e)}else{f=c._reactRootContainer=Ii(c,d);if("function"===
 typeof e){var h=e;e=function(){var a=ye(f._internalRoot);h.call(a)}}$g(function(){null!=a?f.legacy_renderSubtreeIntoContainer(a,b,e):f.render(b,e)})}return ye(f._internalRoot)}function ch(a,b){var c=2<arguments.length&&void 0!==arguments[2]?arguments[2]:null;ob(b)?void 0:n("200");return Hi(a,b,null,c)}da?void 0:n("227");var sh=function(a,b,c,d,e,f,g,h,l){var k=Array.prototype.slice.call(arguments,3);try{b.apply(c,k)}catch(m){this.onError(m)}},qb=!1,$b=null,ac=!1,Yc=null,th={onError:function(a){qb=
 !0;$b=a}},bc=null,Na={},cc=[],Zc={},Oa={},$c={},bd=null,Ue=null,He=null,rb=null,vh=function(a){if(a){var b=a._dispatchListeners,c=a._dispatchInstances;if(Array.isArray(b))for(var d=0;d<b.length&&!a.isPropagationStopped();d++)Ge(a,b[d],c[d]);else b&&Ge(a,b,c);a._dispatchListeners=null;a._dispatchInstances=null;a.isPersistent()||a.constructor.release(a)}},Ae={injectEventPluginOrder:function(a){bc?n("101"):void 0;bc=Array.prototype.slice.call(a);Ee()},injectEventPluginsByName:function(a){var b=!1,c;
 for(c in a)if(a.hasOwnProperty(c)){var d=a[c];Na.hasOwnProperty(c)&&Na[c]===d||(Na[c]?n("102",c):void 0,Na[c]=d,b=!0)}b&&Ee()}},dh=Math.random().toString(36).slice(2),ea="__reactInternalInstance$"+dh,ec="__reactEventHandlers$"+dh,ra=!("undefined"===typeof window||!window.document||!window.document.createElement),Ra={animationend:fc("Animation","AnimationEnd"),animationiteration:fc("Animation","AnimationIteration"),animationstart:fc("Animation","AnimationStart"),transitionend:fc("Transition","TransitionEnd")},
 fd={},Le={};ra&&(Le=document.createElement("div").style,"AnimationEvent"in window||(delete Ra.animationend.animation,delete Ra.animationiteration.animation,delete Ra.animationstart.animation),"TransitionEvent"in window||delete Ra.transitionend.transition);var eh=gc("animationend"),fh=gc("animationiteration"),gh=gc("animationstart"),hh=gc("transitionend"),zb="abort canplay canplaythrough durationchange emptied encrypted ended error loadeddata loadedmetadata loadstart pause play playing progress ratechange seeked seeking stalled suspend timeupdate volumechange waiting".split(" "),
 qa=null,gd=null,hc=null,B=da.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.assign;B(J.prototype,{preventDefault:function(){this.defaultPrevented=!0;var a=this.nativeEvent;a&&(a.preventDefault?a.preventDefault():"unknown"!==typeof a.returnValue&&(a.returnValue=!1),this.isDefaultPrevented=ic)},stopPropagation:function(){var a=this.nativeEvent;a&&(a.stopPropagation?a.stopPropagation():"unknown"!==typeof a.cancelBubble&&(a.cancelBubble=!0),this.isPropagationStopped=ic)},persist:function(){this.isPersistent=
 ic},isPersistent:jc,destructor:function(){var a=this.constructor.Interface,b;for(b in a)this[b]=null;this.nativeEvent=this._targetInst=this.dispatchConfig=null;this.isPropagationStopped=this.isDefaultPrevented=jc;this._dispatchInstances=this._dispatchListeners=null}});J.Interface={type:null,target:null,currentTarget:function(){return null},eventPhase:null,bubbles:null,cancelable:null,timeStamp:function(a){return a.timeStamp||Date.now()},defaultPrevented:null,isTrusted:null};J.extend=function(a){function b(){return c.apply(this,
 arguments)}var c=this,d=function(){};d.prototype=c.prototype;d=new d;B(d,b.prototype);b.prototype=d;b.prototype.constructor=b;b.Interface=B({},c.Interface,a);b.extend=c.extend;Ne(b);return b};Ne(J);var Ji=J.extend({data:null}),Ki=J.extend({data:null}),Ah=[9,13,27,32],hd=ra&&"CompositionEvent"in window,Wb=null;ra&&"documentMode"in document&&(Wb=document.documentMode);var Li=ra&&"TextEvent"in window&&!Wb,Se=ra&&(!hd||Wb&&8<Wb&&11>=Wb),Re=String.fromCharCode(32),pa={beforeInput:{phasedRegistrationNames:{bubbled:"onBeforeInput",
 captured:"onBeforeInputCapture"},dependencies:["compositionend","keypress","textInput","paste"]},compositionEnd:{phasedRegistrationNames:{bubbled:"onCompositionEnd",captured:"onCompositionEndCapture"},dependencies:"blur compositionend keydown keypress keyup mousedown".split(" ")},compositionStart:{phasedRegistrationNames:{bubbled:"onCompositionStart",captured:"onCompositionStartCapture"},dependencies:"blur compositionstart keydown keypress keyup mousedown".split(" ")},compositionUpdate:{phasedRegistrationNames:{bubbled:"onCompositionUpdate",
 captured:"onCompositionUpdateCapture"},dependencies:"blur compositionupdate keydown keypress keyup mousedown".split(" ")}},Qe=!1,Sa=!1,Mi={eventTypes:pa,extractEvents:function(a,b,c,d){var e=void 0;var f=void 0;if(hd)b:{switch(a){case "compositionstart":e=pa.compositionStart;break b;case "compositionend":e=pa.compositionEnd;break b;case "compositionupdate":e=pa.compositionUpdate;break b}e=void 0}else Sa?Oe(a,c)&&(e=pa.compositionEnd):"keydown"===a&&229===c.keyCode&&(e=pa.compositionStart);e?(Se&&
 "ko"!==c.locale&&(Sa||e!==pa.compositionStart?e===pa.compositionEnd&&Sa&&(f=Me()):(qa=d,gd="value"in qa?qa.value:qa.textContent,Sa=!0)),e=Ji.getPooled(e,b,c,d),f?e.data=f:(f=Pe(c),null!==f&&(e.data=f)),Qa(e),f=e):f=null;(a=Li?Bh(a,c):Ch(a,c))?(b=Ki.getPooled(pa.beforeInput,b,c,d),b.data=a,Qa(b)):b=null;return null===f?b:null===b?f:[f,b]}},id=null,Ta=null,Ua=null,Ye=function(a,b){return a(b)},yf=function(a,b,c){return a(b,c)},Ze=function(){},jd=!1,Dh={color:!0,date:!0,datetime:!0,"datetime-local":!0,
 email:!0,month:!0,number:!0,password:!0,range:!0,search:!0,tel:!0,text:!0,time:!0,url:!0,week:!0},Ma=da.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;Ma.hasOwnProperty("ReactCurrentDispatcher")||(Ma.ReactCurrentDispatcher={current:null});var Fh=/^(.*)[\\\/]/,O="function"===typeof Symbol&&Symbol.for,Bc=O?Symbol.for("react.element"):60103,Va=O?Symbol.for("react.portal"):60106,ta=O?Symbol.for("react.fragment"):60107,md=O?Symbol.for("react.strict_mode"):60108,lc=O?Symbol.for("react.profiler"):60114,
 ff=O?Symbol.for("react.provider"):60109,ef=O?Symbol.for("react.context"):60110,ld=O?Symbol.for("react.concurrent_mode"):60111,od=O?Symbol.for("react.forward_ref"):60112,nd=O?Symbol.for("react.suspense"):60113,pd=O?Symbol.for("react.memo"):60115,gf=O?Symbol.for("react.lazy"):60116,df="function"===typeof Symbol&&Symbol.iterator,Hh=/^[:A-Z_a-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD][:A-Z_a-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\-.0-9\u00B7\u0300-\u036F\u203F-\u2040]*$/,
 hf=Object.prototype.hasOwnProperty,kf={},jf={},A={};"children dangerouslySetInnerHTML defaultValue defaultChecked innerHTML suppressContentEditableWarning suppressHydrationWarning style".split(" ").forEach(function(a){A[a]=new K(a,0,!1,a,null)});[["acceptCharset","accept-charset"],["className","class"],["htmlFor","for"],["httpEquiv","http-equiv"]].forEach(function(a){var b=a[0];A[b]=new K(b,1,!1,a[1],null)});["contentEditable","draggable","spellCheck","value"].forEach(function(a){A[a]=new K(a,2,!1,
 a.toLowerCase(),null)});["autoReverse","externalResourcesRequired","focusable","preserveAlpha"].forEach(function(a){A[a]=new K(a,2,!1,a,null)});"allowFullScreen async autoFocus autoPlay controls default defer disabled formNoValidate hidden loop noModule noValidate open playsInline readOnly required reversed scoped seamless itemScope".split(" ").forEach(function(a){A[a]=new K(a,3,!1,a.toLowerCase(),null)});["checked","multiple","muted","selected"].forEach(function(a){A[a]=new K(a,3,!0,a,null)});["capture",
 "download"].forEach(function(a){A[a]=new K(a,4,!1,a,null)});["cols","rows","size","span"].forEach(function(a){A[a]=new K(a,6,!1,a,null)});["rowSpan","start"].forEach(function(a){A[a]=new K(a,5,!1,a.toLowerCase(),null)});var Be=/[\-:]([a-z])/g,Ce=function(a){return a[1].toUpperCase()};"accent-height alignment-baseline arabic-form baseline-shift cap-height clip-path clip-rule color-interpolation color-interpolation-filters color-profile color-rendering dominant-baseline enable-background fill-opacity fill-rule flood-color flood-opacity font-family font-size font-size-adjust font-stretch font-style font-variant font-weight glyph-name glyph-orientation-horizontal glyph-orientation-vertical horiz-adv-x horiz-origin-x image-rendering letter-spacing lighting-color marker-end marker-mid marker-start overline-position overline-thickness paint-order panose-1 pointer-events rendering-intent shape-rendering stop-color stop-opacity strikethrough-position strikethrough-thickness stroke-dasharray stroke-dashoffset stroke-linecap stroke-linejoin stroke-miterlimit stroke-opacity stroke-width text-anchor text-decoration text-rendering underline-position underline-thickness unicode-bidi unicode-range units-per-em v-alphabetic v-hanging v-ideographic v-mathematical vector-effect vert-adv-y vert-origin-x vert-origin-y word-spacing writing-mode xmlns:xlink x-height".split(" ").forEach(function(a){var b=
 a.replace(Be,Ce);A[b]=new K(b,1,!1,a,null)});"xlink:actuate xlink:arcrole xlink:href xlink:role xlink:show xlink:title xlink:type".split(" ").forEach(function(a){var b=a.replace(Be,Ce);A[b]=new K(b,1,!1,a,"http://www.w3.org/1999/xlink")});["xml:base","xml:lang","xml:space"].forEach(function(a){var b=a.replace(Be,Ce);A[b]=new K(b,1,!1,a,"http://www.w3.org/XML/1998/namespace")});["tabIndex","crossOrigin"].forEach(function(a){A[a]=new K(a,1,!1,a.toLowerCase(),null)});var pf={change:{phasedRegistrationNames:{bubbled:"onChange",
 captured:"onChangeCapture"},dependencies:"blur change click focus input keydown keyup selectionchange".split(" ")}},tb=null,ub=null,De=!1;ra&&(De=af("input")&&(!document.documentMode||9<document.documentMode));var Ni={eventTypes:pf,_isInputEventSupported:De,extractEvents:function(a,b,c,d){var e=b?Da(b):window,f=void 0,g=void 0,h=e.nodeName&&e.nodeName.toLowerCase();"select"===h||"input"===h&&"file"===e.type?f=Lh:$e(e)?De?f=Ph:(f=Nh,g=Mh):(h=e.nodeName)&&"input"===h.toLowerCase()&&("checkbox"===e.type||
 "radio"===e.type)&&(f=Oh);if(f&&(f=f(a,b)))return of(f,c,d);g&&g(a,e,b);"blur"===a&&(a=e._wrapperState)&&a.controlled&&"number"===e.type&&ud(e,"number",e.value)}},Xb=J.extend({view:null,detail:null}),Rh={Alt:"altKey",Control:"ctrlKey",Meta:"metaKey",Shift:"shiftKey"},ih=0,jh=0,kh=!1,lh=!1,Yb=Xb.extend({screenX:null,screenY:null,clientX:null,clientY:null,pageX:null,pageY:null,ctrlKey:null,shiftKey:null,altKey:null,metaKey:null,getModifierState:vd,button:null,buttons:null,relatedTarget:function(a){return a.relatedTarget||
 (a.fromElement===a.srcElement?a.toElement:a.fromElement)},movementX:function(a){if("movementX"in a)return a.movementX;var b=ih;ih=a.screenX;return kh?"mousemove"===a.type?a.screenX-b:0:(kh=!0,0)},movementY:function(a){if("movementY"in a)return a.movementY;var b=jh;jh=a.screenY;return lh?"mousemove"===a.type?a.screenY-b:0:(lh=!0,0)}}),mh=Yb.extend({pointerId:null,width:null,height:null,pressure:null,tangentialPressure:null,tiltX:null,tiltY:null,twist:null,pointerType:null,isPrimary:null}),Zb={mouseEnter:{registrationName:"onMouseEnter",
 dependencies:["mouseout","mouseover"]},mouseLeave:{registrationName:"onMouseLeave",dependencies:["mouseout","mouseover"]},pointerEnter:{registrationName:"onPointerEnter",dependencies:["pointerout","pointerover"]},pointerLeave:{registrationName:"onPointerLeave",dependencies:["pointerout","pointerover"]}},Oi={eventTypes:Zb,extractEvents:function(a,b,c,d){var e="mouseover"===a||"pointerover"===a,f="mouseout"===a||"pointerout"===a;if(e&&(c.relatedTarget||c.fromElement)||!f&&!e)return null;e=d.window===
 d?d:(e=d.ownerDocument)?e.defaultView||e.parentWindow:window;f?(f=b,b=(b=c.relatedTarget||c.toElement)?dc(b):null):f=null;if(f===b)return null;var g=void 0,h=void 0,l=void 0,k=void 0;if("mouseout"===a||"mouseover"===a)g=Yb,h=Zb.mouseLeave,l=Zb.mouseEnter,k="mouse";else if("pointerout"===a||"pointerover"===a)g=mh,h=Zb.pointerLeave,l=Zb.pointerEnter,k="pointer";var m=null==f?e:Da(f);e=null==b?e:Da(b);a=g.getPooled(h,f,c,d);a.type=k+"leave";a.target=m;a.relatedTarget=e;c=g.getPooled(l,b,c,d);c.type=
 k+"enter";c.target=e;c.relatedTarget=m;d=b;if(f&&d)a:{b=f;e=d;k=0;for(g=b;g;g=fa(g))k++;g=0;for(l=e;l;l=fa(l))g++;for(;0<k-g;)b=fa(b),k--;for(;0<g-k;)e=fa(e),g--;for(;k--;){if(b===e||b===e.alternate)break a;b=fa(b);e=fa(e)}b=null}else b=null;e=b;for(b=[];f&&f!==e;){k=f.alternate;if(null!==k&&k===e)break;b.push(f);f=fa(f)}for(f=[];d&&d!==e;){k=d.alternate;if(null!==k&&k===e)break;f.push(d);d=fa(d)}for(d=0;d<b.length;d++)ed(b[d],"bubbled",a);for(d=f.length;0<d--;)ed(f[d],"captured",c);return[a,c]}},
 Sh=Object.prototype.hasOwnProperty,Pi=J.extend({animationName:null,elapsedTime:null,pseudoElement:null}),Qi=J.extend({clipboardData:function(a){return"clipboardData"in a?a.clipboardData:window.clipboardData}}),Ri=Xb.extend({relatedTarget:null}),Si={Esc:"Escape",Spacebar:" ",Left:"ArrowLeft",Up:"ArrowUp",Right:"ArrowRight",Down:"ArrowDown",Del:"Delete",Win:"OS",Menu:"ContextMenu",Apps:"ContextMenu",Scroll:"ScrollLock",MozPrintableKey:"Unidentified"},Ti={8:"Backspace",9:"Tab",12:"Clear",13:"Enter",
 16:"Shift",17:"Control",18:"Alt",19:"Pause",20:"CapsLock",27:"Escape",32:" ",33:"PageUp",34:"PageDown",35:"End",36:"Home",37:"ArrowLeft",38:"ArrowUp",39:"ArrowRight",40:"ArrowDown",45:"Insert",46:"Delete",112:"F1",113:"F2",114:"F3",115:"F4",116:"F5",117:"F6",118:"F7",119:"F8",120:"F9",121:"F10",122:"F11",123:"F12",144:"NumLock",145:"ScrollLock",224:"Meta"},Ui=Xb.extend({key:function(a){if(a.key){var b=Si[a.key]||a.key;if("Unidentified"!==b)return b}return"keypress"===a.type?(a=nc(a),13===a?"Enter":
 String.fromCharCode(a)):"keydown"===a.type||"keyup"===a.type?Ti[a.keyCode]||"Unidentified":""},location:null,ctrlKey:null,shiftKey:null,altKey:null,metaKey:null,repeat:null,locale:null,getModifierState:vd,charCode:function(a){return"keypress"===a.type?nc(a):0},keyCode:function(a){return"keydown"===a.type||"keyup"===a.type?a.keyCode:0},which:function(a){return"keypress"===a.type?nc(a):"keydown"===a.type||"keyup"===a.type?a.keyCode:0}}),Vi=Yb.extend({dataTransfer:null}),Wi=Xb.extend({touches:null,targetTouches:null,
 changedTouches:null,altKey:null,metaKey:null,ctrlKey:null,shiftKey:null,getModifierState:vd}),Xi=J.extend({propertyName:null,elapsedTime:null,pseudoElement:null}),Yi=Yb.extend({deltaX:function(a){return"deltaX"in a?a.deltaX:"wheelDeltaX"in a?-a.wheelDeltaX:0},deltaY:function(a){return"deltaY"in a?a.deltaY:"wheelDeltaY"in a?-a.wheelDeltaY:"wheelDelta"in a?-a.wheelDelta:0},deltaZ:null,deltaMode:null}),Zi=[["abort","abort"],[eh,"animationEnd"],[fh,"animationIteration"],[gh,"animationStart"],["canplay",
 "canPlay"],["canplaythrough","canPlayThrough"],["drag","drag"],["dragenter","dragEnter"],["dragexit","dragExit"],["dragleave","dragLeave"],["dragover","dragOver"],["durationchange","durationChange"],["emptied","emptied"],["encrypted","encrypted"],["ended","ended"],["error","error"],["gotpointercapture","gotPointerCapture"],["load","load"],["loadeddata","loadedData"],["loadedmetadata","loadedMetadata"],["loadstart","loadStart"],["lostpointercapture","lostPointerCapture"],["mousemove","mouseMove"],
 ["mouseout","mouseOut"],["mouseover","mouseOver"],["playing","playing"],["pointermove","pointerMove"],["pointerout","pointerOut"],["pointerover","pointerOver"],["progress","progress"],["scroll","scroll"],["seeking","seeking"],["stalled","stalled"],["suspend","suspend"],["timeupdate","timeUpdate"],["toggle","toggle"],["touchmove","touchMove"],[hh,"transitionEnd"],["waiting","waiting"],["wheel","wheel"]],vf={},wd={};[["blur","blur"],["cancel","cancel"],["click","click"],["close","close"],["contextmenu",
 "contextMenu"],["copy","copy"],["cut","cut"],["auxclick","auxClick"],["dblclick","doubleClick"],["dragend","dragEnd"],["dragstart","dragStart"],["drop","drop"],["focus","focus"],["input","input"],["invalid","invalid"],["keydown","keyDown"],["keypress","keyPress"],["keyup","keyUp"],["mousedown","mouseDown"],["mouseup","mouseUp"],["paste","paste"],["pause","pause"],["play","play"],["pointercancel","pointerCancel"],["pointerdown","pointerDown"],["pointerup","pointerUp"],["ratechange","rateChange"],["reset",
 "reset"],["seeked","seeked"],["submit","submit"],["touchcancel","touchCancel"],["touchend","touchEnd"],["touchstart","touchStart"],["volumechange","volumeChange"]].forEach(function(a){uf(a,!0)});Zi.forEach(function(a){uf(a,!1)});var nh={eventTypes:vf,isInteractiveTopLevelEventType:function(a){a=wd[a];return void 0!==a&&!0===a.isInteractive},extractEvents:function(a,b,c,d){var e=wd[a];if(!e)return null;switch(a){case "keypress":if(0===nc(c))return null;case "keydown":case "keyup":a=Ui;break;case "blur":case "focus":a=
 Ri;break;case "click":if(2===c.button)return null;case "auxclick":case "dblclick":case "mousedown":case "mousemove":case "mouseup":case "mouseout":case "mouseover":case "contextmenu":a=Yb;break;case "drag":case "dragend":case "dragenter":case "dragexit":case "dragleave":case "dragover":case "dragstart":case "drop":a=Vi;break;case "touchcancel":case "touchend":case "touchmove":case "touchstart":a=Wi;break;case eh:case fh:case gh:a=Pi;break;case hh:a=Xi;break;case "scroll":a=Xb;break;case "wheel":a=
 Yi;break;case "copy":case "cut":case "paste":a=Qi;break;case "gotpointercapture":case "lostpointercapture":case "pointercancel":case "pointerdown":case "pointermove":case "pointerout":case "pointerover":case "pointerup":a=mh;break;default:a=J}b=a.getPooled(e,b,c,d);Qa(b);return b}},wf=nh.isInteractiveTopLevelEventType,rc=[],qc=!0,Af={},Vh=0,sc="_reactListenersID"+(""+Math.random()).slice(2),$i=ra&&"documentMode"in document&&11>=document.documentMode,Hf={select:{phasedRegistrationNames:{bubbled:"onSelect",
 captured:"onSelectCapture"},dependencies:"blur contextmenu dragend focus keydown keyup mousedown mouseup selectionchange".split(" ")}},Wa=null,Ad=null,xb=null,zd=!1,aj={eventTypes:Hf,extractEvents:function(a,b,c,d){var e=d.window===d?d.document:9===d.nodeType?d:d.ownerDocument,f;if(!(f=!e)){a:{e=zf(e);f=$c.onSelect;for(var g=0;g<f.length;g++){var h=f[g];if(!e.hasOwnProperty(h)||!e[h]){e=!1;break a}}e=!0}f=!e}if(f)return null;e=b?Da(b):window;switch(a){case "focus":if($e(e)||"true"===e.contentEditable)Wa=
 e,Ad=b,xb=null;break;case "blur":xb=Ad=Wa=null;break;case "mousedown":zd=!0;break;case "contextmenu":case "mouseup":case "dragend":return zd=!1,Gf(c,d);case "selectionchange":if($i)break;case "keydown":case "keyup":return Gf(c,d)}return null}};Ae.injectEventPluginOrder("ResponderEventPlugin SimpleEventPlugin EnterLeaveEventPlugin ChangeEventPlugin SelectEventPlugin BeforeInputEventPlugin".split(" "));(function(a,b,c){bd=a;Ue=b;He=c})(dd,Je,Da);Ae.injectEventPluginsByName({SimpleEventPlugin:nh,EnterLeaveEventPlugin:Oi,
 ChangeEventPlugin:Ni,SelectEventPlugin:aj,BeforeInputEventPlugin:Mi});var Xc=void 0,Of=function(a){return"undefined"!==typeof MSApp&&MSApp.execUnsafeLocalFunction?function(b,c,d,e){MSApp.execUnsafeLocalFunction(function(){return a(b,c,d,e)})}:a}(function(a,b){if("http://www.w3.org/2000/svg"!==a.namespaceURI||"innerHTML"in a)a.innerHTML=b;else{Xc=Xc||document.createElement("div");Xc.innerHTML="<svg>"+b+"</svg>";for(b=Xc.firstChild;a.firstChild;)a.removeChild(a.firstChild);for(;b.firstChild;)a.appendChild(b.firstChild)}}),
 Ab=function(a,b){if(b){var c=a.firstChild;if(c&&c===a.lastChild&&3===c.nodeType){c.nodeValue=b;return}}a.textContent=b},yb={animationIterationCount:!0,borderImageOutset:!0,borderImageSlice:!0,borderImageWidth:!0,boxFlex:!0,boxFlexGroup:!0,boxOrdinalGroup:!0,columnCount:!0,columns:!0,flex:!0,flexGrow:!0,flexPositive:!0,flexShrink:!0,flexNegative:!0,flexOrder:!0,gridArea:!0,gridRow:!0,gridRowEnd:!0,gridRowSpan:!0,gridRowStart:!0,gridColumn:!0,gridColumnEnd:!0,gridColumnSpan:!0,gridColumnStart:!0,fontWeight:!0,
 lineClamp:!0,lineHeight:!0,opacity:!0,order:!0,orphans:!0,tabSize:!0,widows:!0,zIndex:!0,zoom:!0,fillOpacity:!0,floodOpacity:!0,stopOpacity:!0,strokeDasharray:!0,strokeDashoffset:!0,strokeMiterlimit:!0,strokeOpacity:!0,strokeWidth:!0},bj=["Webkit","ms","Moz","O"];Object.keys(yb).forEach(function(a){bj.forEach(function(b){b=b+a.charAt(0).toUpperCase()+a.substring(1);yb[b]=yb[a]})});var Zh=B({menuitem:!0},{area:!0,base:!0,br:!0,col:!0,embed:!0,hr:!0,img:!0,input:!0,keygen:!0,link:!0,meta:!0,param:!0,
 source:!0,track:!0,wbr:!0}),R=da.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler,Vg=R.unstable_cancelCallback,ue=R.unstable_now,Wg=R.unstable_scheduleCallback,Gi=R.unstable_shouldYield,Mc=R.unstable_runWithPriority,zi=R.unstable_getCurrentPriorityLevel,se=R.unstable_ImmediatePriority,te=R.unstable_UserBlockingPriority,Lg=R.unstable_NormalPriority,Ai=R.unstable_LowPriority,Bi=R.unstable_IdlePriority,ne=null,oe=null,Ei="function"===typeof setTimeout?setTimeout:void 0,Yg="function"===typeof clearTimeout?
 clearTimeout:void 0,vi=Wg,ti=Vg;new Set;var Id=[],Ya=-1,va={},F={current:va},M={current:!1},Fa=va,Kd=null,Ld=null,S=function(a,b,c,d){return new bi(a,b,c,d)},$f=(new da.Component).refs,zc={isMounted:function(a){return(a=a._reactInternalFiber)?2===wb(a):!1},enqueueSetState:function(a,b,c){a=a._reactInternalFiber;var d=ka();d=fb(d,a);var e=Aa(d);e.payload=b;void 0!==c&&null!==c&&(e.callback=c);eb();na(a,e);ya(a,d)},enqueueReplaceState:function(a,b,c){a=a._reactInternalFiber;var d=ka();d=fb(d,a);var e=
 Aa(d);e.tag=yg;e.payload=b;void 0!==c&&null!==c&&(e.callback=c);eb();na(a,e);ya(a,d)},enqueueForceUpdate:function(a,b){a=a._reactInternalFiber;var c=ka();c=fb(c,a);var d=Aa(c);d.tag=Ec;void 0!==b&&null!==b&&(d.callback=b);eb();na(a,d);ya(a,c)}},Cc=Array.isArray,hb=ag(!0),ae=ag(!1),Eb={},U={current:Eb},Gb={current:Eb},Fb={current:Eb},db=0,pi=2,Rb=4,ji=8,ri=16,Sb=32,me=64,le=128,Dc=Ma.ReactCurrentDispatcher,Hb=0,xa=null,y=null,W=null,bb=null,G=null,ab=null,Kb=0,X=null,Lb=0,Ib=!1,ia=null,Jb=0,Ud={readContext:T,
 useCallback:V,useContext:V,useEffect:V,useImperativeHandle:V,useLayoutEffect:V,useMemo:V,useReducer:V,useRef:V,useState:V,useDebugValue:V},fi={readContext:T,useCallback:function(a,b){cb().memoizedState=[a,void 0===b?null:b];return a},useContext:T,useEffect:function(a,b){return Xd(516,le|me,a,b)},useImperativeHandle:function(a,b,c){c=null!==c&&void 0!==c?c.concat([a]):null;return Xd(4,Rb|Sb,fg.bind(null,b,a),c)},useLayoutEffect:function(a,b){return Xd(4,Rb|Sb,a,b)},useMemo:function(a,b){var c=cb();
 b=void 0===b?null:b;a=a();c.memoizedState=[a,b];return a},useReducer:function(a,b,c){var d=cb();b=void 0!==c?c(b):b;d.memoizedState=d.baseState=b;a=d.queue={last:null,dispatch:null,lastRenderedReducer:a,lastRenderedState:b};a=a.dispatch=hg.bind(null,xa,a);return[d.memoizedState,a]},useRef:function(a){var b=cb();a={current:a};return b.memoizedState=a},useState:function(a){var b=cb();"function"===typeof a&&(a=a());b.memoizedState=b.baseState=a;a=b.queue={last:null,dispatch:null,lastRenderedReducer:dg,
 lastRenderedState:a};a=a.dispatch=hg.bind(null,xa,a);return[b.memoizedState,a]},useDebugValue:gg},cg={readContext:T,useCallback:function(a,b){var c=Mb();b=void 0===b?null:b;var d=c.memoizedState;if(null!==d&&null!==b&&Sd(b,d[1]))return d[0];c.memoizedState=[a,b];return a},useContext:T,useEffect:function(a,b){return Yd(516,le|me,a,b)},useImperativeHandle:function(a,b,c){c=null!==c&&void 0!==c?c.concat([a]):null;return Yd(4,Rb|Sb,fg.bind(null,b,a),c)},useLayoutEffect:function(a,b){return Yd(4,Rb|Sb,
 a,b)},useMemo:function(a,b){var c=Mb();b=void 0===b?null:b;var d=c.memoizedState;if(null!==d&&null!==b&&Sd(b,d[1]))return d[0];a=a();c.memoizedState=[a,b];return a},useReducer:eg,useRef:function(a){return Mb().memoizedState},useState:function(a){return eg(dg,a)},useDebugValue:gg},la=null,gb=null,Ia=!1,gi=Ma.ReactCurrentOwner,ja=!1,de={current:null},Nb=null,Ja=null,Ob=null,ug=0,yg=1,Ec=2,ge=3,za=!1,Og=void 0,pe=void 0,Ng=void 0,Pg=void 0;Og=function(a,b,c,d){for(c=b.child;null!==c;){if(5===c.tag||
 6===c.tag)a.appendChild(c.stateNode);else if(4!==c.tag&&null!==c.child){c.child.return=c;c=c.child;continue}if(c===b)break;for(;null===c.sibling;){if(null===c.return||c.return===b)return;c=c.return}c.sibling.return=c.return;c=c.sibling}};pe=function(a){};Ng=function(a,b,c,d,e){var f=a.memoizedProps;if(f!==d){var g=b.stateNode;Ha(U.current);a=null;switch(c){case "input":f=sd(g,f);d=sd(g,d);a=[];break;case "option":f=Bd(g,f);d=Bd(g,d);a=[];break;case "select":f=B({},f,{value:void 0});d=B({},d,{value:void 0});
 a=[];break;case "textarea":f=Cd(g,f);d=Cd(g,d);a=[];break;default:"function"!==typeof f.onClick&&"function"===typeof d.onClick&&(g.onclick=tc)}Ed(c,d);g=c=void 0;var h=null;for(c in f)if(!d.hasOwnProperty(c)&&f.hasOwnProperty(c)&&null!=f[c])if("style"===c){var l=f[c];for(g in l)l.hasOwnProperty(g)&&(h||(h={}),h[g]="")}else"dangerouslySetInnerHTML"!==c&&"children"!==c&&"suppressContentEditableWarning"!==c&&"suppressHydrationWarning"!==c&&"autoFocus"!==c&&(Oa.hasOwnProperty(c)?a||(a=[]):(a=a||[]).push(c,
 null));for(c in d){var k=d[c];l=null!=f?f[c]:void 0;if(d.hasOwnProperty(c)&&k!==l&&(null!=k||null!=l))if("style"===c)if(l){for(g in l)!l.hasOwnProperty(g)||k&&k.hasOwnProperty(g)||(h||(h={}),h[g]="");for(g in k)k.hasOwnProperty(g)&&l[g]!==k[g]&&(h||(h={}),h[g]=k[g])}else h||(a||(a=[]),a.push(c,h)),h=k;else"dangerouslySetInnerHTML"===c?(k=k?k.__html:void 0,l=l?l.__html:void 0,null!=k&&l!==k&&(a=a||[]).push(c,""+k)):"children"===c?l===k||"string"!==typeof k&&"number"!==typeof k||(a=a||[]).push(c,""+
 k):"suppressContentEditableWarning"!==c&&"suppressHydrationWarning"!==c&&(Oa.hasOwnProperty(c)?(null!=k&&ha(e,c),a||l===k||(a=[])):(a=a||[]).push(c,k))}h&&(a=a||[]).push("style",h);e=a;(b.updateQueue=e)&&Pb(b)}};Pg=function(a,b,c,d){c!==d&&Pb(b)};var ki="function"===typeof WeakSet?WeakSet:Set,xi="function"===typeof WeakMap?WeakMap:Map,qe=Ma.ReactCurrentDispatcher,Kg=Ma.ReactCurrentOwner,ze=1073741822,Ca=!1,x=null,Y=null,H=0,La=-1,je=!1,p=null,Lc=!1,ke=null,Jc=null,Ic=null,Ba=null,ba=null,I=null,Oc=
 0,Pc=void 0,w=!1,ca=null,C=0,oa=0,lb=!1,Uc=null,z=!1,Rc=!1,kb=null,ve=ue(),aa=1073741822-(ve/10|0),jb=aa,Ci=50,Tb=0,we=null,Tc=!1;id=function(a,b,c){switch(b){case "input":td(a,c);b=c.name;if("radio"===c.type&&null!=b){for(c=a;c.parentNode;)c=c.parentNode;c=c.querySelectorAll("input[name="+JSON.stringify(""+b)+'][type="radio"]');for(b=0;b<c.length;b++){var d=c[b];if(d!==a&&d.form===a.form){var e=dd(d);e?void 0:n("90");cf(d);td(d,e)}}}break;case "textarea":Jf(a,c);break;case "select":b=c.value,null!=
 b&&Xa(a,!!c.multiple,b,!1)}};Vb.prototype.render=function(a){this._defer?void 0:n("250");this._hasChildren=!0;this._children=a;var b=this._root._internalRoot,c=this._expirationTime,d=new mb;bh(a,b,null,c,d._onCommit);return d};Vb.prototype.then=function(a){if(this._didComplete)a();else{var b=this._callbacks;null===b&&(b=this._callbacks=[]);b.push(a)}};Vb.prototype.commit=function(){var a=this._root._internalRoot,b=a.firstBatch;this._defer&&null!==b?void 0:n("251");if(this._hasChildren){var c=this._expirationTime;
 if(b!==this){this._hasChildren&&(c=this._expirationTime=b._expirationTime,this.render(this._children));for(var d=null,e=b;e!==this;)d=e,e=e._next;null===d?n("251"):void 0;d._next=e._next;this._next=b;a.firstBatch=this}this._defer=!1;Xg(a,c);b=this._next;this._next=null;b=a.firstBatch=b;null!==b&&b._hasChildren&&b.render(b._children)}else this._next=null,this._defer=!1};Vb.prototype._onComplete=function(){if(!this._didComplete){this._didComplete=!0;var a=this._callbacks;if(null!==a)for(var b=0;b<a.length;b++)(0,a[b])()}};
 mb.prototype.then=function(a){if(this._didCommit)a();else{var b=this._callbacks;null===b&&(b=this._callbacks=[]);b.push(a)}};mb.prototype._onCommit=function(){if(!this._didCommit){this._didCommit=!0;var a=this._callbacks;if(null!==a)for(var b=0;b<a.length;b++){var c=a[b];"function"!==typeof c?n("191",c):void 0;c()}}};nb.prototype.render=function(a,b){var c=this._internalRoot,d=new mb;b=void 0===b?null:b;null!==b&&d.then(b);xe(a,c,null,d._onCommit);return d};nb.prototype.unmount=function(a){var b=
 this._internalRoot,c=new mb;a=void 0===a?null:a;null!==a&&c.then(a);xe(null,b,null,c._onCommit);return c};nb.prototype.legacy_renderSubtreeIntoContainer=function(a,b,c){var d=this._internalRoot,e=new mb;c=void 0===c?null:c;null!==c&&e.then(c);xe(b,d,a,e._onCommit);return e};nb.prototype.createBatch=function(){var a=new Vb(this),b=a._expirationTime,c=this._internalRoot,d=c.firstBatch;if(null===d)c.firstBatch=a,a._next=null;else{for(c=null;null!==d&&d._expirationTime>=b;)c=d,d=d._next;a._next=d;null!==
 c&&(c._next=a)}return a};(function(a,b,c){Ye=a;yf=b;Ze=c})(Zg,ah,function(){w||0===oa||(Z(oa,!1),oa=0)});var oh={createPortal:ch,findDOMNode:function(a){if(null==a)return null;if(1===a.nodeType)return a;var b=a._reactInternalFiber;void 0===b&&("function"===typeof a.render?n("188"):n("268",Object.keys(a)));a=tf(b);a=null===a?null:a.stateNode;return a},hydrate:function(a,b,c){ob(b)?void 0:n("200");return Wc(null,a,b,!0,c)},render:function(a,b,c){ob(b)?void 0:n("200");return Wc(null,a,b,!1,c)},unstable_renderSubtreeIntoContainer:function(a,
 b,c,d){ob(c)?void 0:n("200");null==a||void 0===a._reactInternalFiber?n("38"):void 0;return Wc(a,b,c,!1,d)},unmountComponentAtNode:function(a){ob(a)?void 0:n("40");return a._reactRootContainer?($g(function(){Wc(null,null,a,!1,function(){a._reactRootContainer=null})}),!0):!1},unstable_createPortal:function(){return ch.apply(void 0,arguments)},unstable_batchedUpdates:Zg,unstable_interactiveUpdates:ah,flushSync:function(a,b){w?n("187"):void 0;var c=z;z=!0;try{return Tg(a,b)}finally{z=c,Z(1073741823,!1)}},
 unstable_createRoot:function(a,b){ob(a)?void 0:n("299","unstable_createRoot");return new nb(a,!0,null!=b&&!0===b.hydrate)},unstable_flushControlled:function(a){var b=z;z=!0;try{Tg(a)}finally{(z=b)||w||Z(1073741823,!1)}},__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED:{Events:[Je,Da,dd,Ae.injectEventPluginsByName,Zc,Qa,function(a){ad(a,xh)},Ve,We,oc,cd]}};(function(a){var b=a.findFiberByHostInstance;return ai(B({},a,{overrideProps:null,currentDispatcherRef:Ma.ReactCurrentDispatcher,findHostInstanceByFiber:function(a){a=
 tf(a);return null===a?null:a.stateNode},findFiberByHostInstance:function(a){return b?b(a):null}}))})({findFiberByHostInstance:dc,bundleType:0,version:"16.8.6",rendererPackageName:"react-dom"});var ph={default:oh},qh=ph&&oh||ph;return qh.default||qh});
@@ -1,33 +0,0 @@
 /** @license React v16.8.6
 * react.production.min.js
 *
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 'use strict';(function(N,q){"object"===typeof exports&&"undefined"!==typeof module?module.exports=q():"function"===typeof define&&define.amd?define(q):N.React=q()})(this,function(){function N(a,b,d,g,p,c,e,h){if(!a){a=void 0;if(void 0===b)a=Error("Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.");else{var n=[d,g,p,c,e,h],f=0;a=Error(b.replace(/%s/g,function(){return n[f++]}));a.name="Invariant Violation"}a.framesToPop=1;
 throw a;}}function q(a){for(var b=arguments.length-1,d="https://reactjs.org/docs/error-decoder.html?invariant="+a,g=0;g<b;g++)d+="&args[]="+encodeURIComponent(arguments[g+1]);N(!1,"Minified React error #"+a+"; visit %s for the full message or use the non-minified dev environment for full errors and additional helpful warnings. ",d)}function t(a,b,d){this.props=a;this.context=b;this.refs=ba;this.updater=d||ca}function da(){}function O(a,b,d){this.props=a;this.context=b;this.refs=ba;this.updater=d||
 ca}function u(){if(!x){var a=c.expirationTime;C?P():C=!0;D(ta,a)}}function Q(){var a=c,b=c.next;if(c===b)c=null;else{var d=c.previous;c=d.next=b;b.previous=d}a.next=a.previous=null;d=a.callback;b=a.expirationTime;a=a.priorityLevel;var g=f,p=E;f=a;E=b;try{var n=d()}finally{f=g,E=p}if("function"===typeof n)if(n={callback:n,priorityLevel:a,expirationTime:b,next:null,previous:null},null===c)c=n.next=n.previous=n;else{d=null;a=c;do{if(a.expirationTime>=b){d=a;break}a=a.next}while(a!==c);null===d?d=c:d===
 c&&(c=n,u());b=d.previous;b.next=d.previous=n;n.next=d;n.previous=b}}function F(){if(-1===k&&null!==c&&1===c.priorityLevel){x=!0;try{do Q();while(null!==c&&1===c.priorityLevel)}finally{x=!1,null!==c?u():C=!1}}}function ta(a){x=!0;var b=G;G=a;try{if(a)for(;null!==c;){var d=l();if(c.expirationTime<=d){do Q();while(null!==c&&c.expirationTime<=d)}else break}else if(null!==c){do Q();while(null!==c&&!H())}}finally{x=!1,G=b,null!==c?u():C=!1,F()}}function ea(a,b,d){var g=void 0,p={},c=null,e=null;if(null!=
 b)for(g in void 0!==b.ref&&(e=b.ref),void 0!==b.key&&(c=""+b.key),b)fa.call(b,g)&&!ha.hasOwnProperty(g)&&(p[g]=b[g]);var h=arguments.length-2;if(1===h)p.children=d;else if(1<h){for(var f=Array(h),k=0;k<h;k++)f[k]=arguments[k+2];p.children=f}if(a&&a.defaultProps)for(g in h=a.defaultProps,h)void 0===p[g]&&(p[g]=h[g]);return{$$typeof:y,type:a,key:c,ref:e,props:p,_owner:R.current}}function ua(a,b){return{$$typeof:y,type:a.type,key:b,ref:a.ref,props:a.props,_owner:a._owner}}function S(a){return"object"===
 typeof a&&null!==a&&a.$$typeof===y}function va(a){var b={"=":"=0",":":"=2"};return"$"+(""+a).replace(/[=:]/g,function(a){return b[a]})}function ia(a,b,d,g){if(I.length){var c=I.pop();c.result=a;c.keyPrefix=b;c.func=d;c.context=g;c.count=0;return c}return{result:a,keyPrefix:b,func:d,context:g,count:0}}function ja(a){a.result=null;a.keyPrefix=null;a.func=null;a.context=null;a.count=0;10>I.length&&I.push(a)}function T(a,b,d,g){var c=typeof a;if("undefined"===c||"boolean"===c)a=null;var e=!1;if(null===
 a)e=!0;else switch(c){case "string":case "number":e=!0;break;case "object":switch(a.$$typeof){case y:case wa:e=!0}}if(e)return d(g,a,""===b?"."+U(a,0):b),1;e=0;b=""===b?".":b+":";if(Array.isArray(a))for(var f=0;f<a.length;f++){c=a[f];var h=b+U(c,f);e+=T(c,h,d,g)}else if(null===a||"object"!==typeof a?h=null:(h=ka&&a[ka]||a["@@iterator"],h="function"===typeof h?h:null),"function"===typeof h)for(a=h.call(a),f=0;!(c=a.next()).done;)c=c.value,h=b+U(c,f++),e+=T(c,h,d,g);else"object"===c&&(d=""+a,q("31",
 "[object Object]"===d?"object with keys {"+Object.keys(a).join(", ")+"}":d,""));return e}function V(a,b,d){return null==a?0:T(a,"",b,d)}function U(a,b){return"object"===typeof a&&null!==a&&null!=a.key?va(a.key):b.toString(36)}function xa(a,b,d){a.func.call(a.context,b,a.count++)}function ya(a,b,d){var g=a.result,c=a.keyPrefix;a=a.func.call(a.context,b,a.count++);Array.isArray(a)?W(a,g,d,function(a){return a}):null!=a&&(S(a)&&(a=ua(a,c+(!a.key||b&&b.key===a.key?"":(""+a.key).replace(la,"$&/")+"/")+
 d)),g.push(a))}function W(a,b,d,g,c){var e="";null!=d&&(e=(""+d).replace(la,"$&/")+"/");b=ia(b,e,g,c);V(a,ya,b);ja(b)}function m(){var a=ma.current;null===a?q("321"):void 0;return a}var e="function"===typeof Symbol&&Symbol.for,y=e?Symbol.for("react.element"):60103,wa=e?Symbol.for("react.portal"):60106,r=e?Symbol.for("react.fragment"):60107,X=e?Symbol.for("react.strict_mode"):60108,za=e?Symbol.for("react.profiler"):60114,Aa=e?Symbol.for("react.provider"):60109,Ba=e?Symbol.for("react.context"):60110,
 Ca=e?Symbol.for("react.concurrent_mode"):60111,Da=e?Symbol.for("react.forward_ref"):60112,Ea=e?Symbol.for("react.suspense"):60113,Fa=e?Symbol.for("react.memo"):60115,Ga=e?Symbol.for("react.lazy"):60116,ka="function"===typeof Symbol&&Symbol.iterator,na=Object.getOwnPropertySymbols,Ha=Object.prototype.hasOwnProperty,Ia=Object.prototype.propertyIsEnumerable,J=function(){try{if(!Object.assign)return!1;var a=new String("abc");a[5]="de";if("5"===Object.getOwnPropertyNames(a)[0])return!1;var b={};for(a=
 0;10>a;a++)b["_"+String.fromCharCode(a)]=a;if("0123456789"!==Object.getOwnPropertyNames(b).map(function(a){return b[a]}).join(""))return!1;var d={};"abcdefghijklmnopqrst".split("").forEach(function(a){d[a]=a});return"abcdefghijklmnopqrst"!==Object.keys(Object.assign({},d)).join("")?!1:!0}catch(g){return!1}}()?Object.assign:function(a,b){if(null===a||void 0===a)throw new TypeError("Object.assign cannot be called with null or undefined");var d=Object(a);for(var c,e=1;e<arguments.length;e++){var f=Object(arguments[e]);
 for(var k in f)Ha.call(f,k)&&(d[k]=f[k]);if(na){c=na(f);for(var h=0;h<c.length;h++)Ia.call(f,c[h])&&(d[c[h]]=f[c[h]])}}return d},ca={isMounted:function(a){return!1},enqueueForceUpdate:function(a,b,d){},enqueueReplaceState:function(a,b,d,c){},enqueueSetState:function(a,b,d,c){}},ba={};t.prototype.isReactComponent={};t.prototype.setState=function(a,b){"object"!==typeof a&&"function"!==typeof a&&null!=a?q("85"):void 0;this.updater.enqueueSetState(this,a,b,"setState")};t.prototype.forceUpdate=function(a){this.updater.enqueueForceUpdate(this,
 a,"forceUpdate")};da.prototype=t.prototype;e=O.prototype=new da;e.constructor=O;J(e,t.prototype);e.isPureReactComponent=!0;var c=null,G=!1,f=3,k=-1,E=-1,x=!1,C=!1,Ja=Date,Ka="function"===typeof setTimeout?setTimeout:void 0,La="function"===typeof clearTimeout?clearTimeout:void 0,oa="function"===typeof requestAnimationFrame?requestAnimationFrame:void 0,pa="function"===typeof cancelAnimationFrame?cancelAnimationFrame:void 0,qa,ra,Y=function(a){qa=oa(function(b){La(ra);a(b)});ra=Ka(function(){pa(qa);
 a(l())},100)};if("object"===typeof performance&&"function"===typeof performance.now){var Ma=performance;var l=function(){return Ma.now()}}else l=function(){return Ja.now()};e=null;"undefined"!==typeof window?e=window:"undefined"!==typeof global&&(e=global);if(e&&e._schedMock){e=e._schedMock;var D=e[0];var P=e[1];var H=e[2];l=e[3]}else if("undefined"===typeof window||"function"!==typeof MessageChannel){var v=null,Na=function(a){if(null!==v)try{v(a)}finally{v=null}};D=function(a,b){null!==v?setTimeout(D,
 0,a):(v=a,setTimeout(Na,0,!1))};P=function(){v=null};H=function(){return!1}}else{"undefined"!==typeof console&&("function"!==typeof oa&&console.error("This browser doesn't support requestAnimationFrame. Make sure that you load a polyfill in older browsers. https://fb.me/react-polyfills"),"function"!==typeof pa&&console.error("This browser doesn't support cancelAnimationFrame. Make sure that you load a polyfill in older browsers. https://fb.me/react-polyfills"));var w=null,K=!1,z=-1,A=!1,Z=!1,L=0,
 M=33,B=33;H=function(){return L<=l()};e=new MessageChannel;var sa=e.port2;e.port1.onmessage=function(a){K=!1;a=w;var b=z;w=null;z=-1;var d=l(),c=!1;if(0>=L-d)if(-1!==b&&b<=d)c=!0;else{A||(A=!0,Y(aa));w=a;z=b;return}if(null!==a){Z=!0;try{a(c)}finally{Z=!1}}};var aa=function(a){if(null!==w){Y(aa);var b=a-L+B;b<B&&M<B?(8>b&&(b=8),B=b<M?M:b):M=b;L=a+B;K||(K=!0,sa.postMessage(void 0))}else A=!1};D=function(a,b){w=a;z=b;Z||0>b?sa.postMessage(void 0):A||(A=!0,Y(aa))};P=function(){w=null;K=!1;z=-1}}var Oa=
 0,ma={current:null},R={current:null};e={ReactCurrentDispatcher:ma,ReactCurrentOwner:R,assign:J};J(e,{Scheduler:{unstable_cancelCallback:function(a){var b=a.next;if(null!==b){if(b===a)c=null;else{a===c&&(c=b);var d=a.previous;d.next=b;b.previous=d}a.next=a.previous=null}},unstable_shouldYield:function(){return!G&&(null!==c&&c.expirationTime<E||H())},unstable_now:l,unstable_scheduleCallback:function(a,b){var d=-1!==k?k:l();if("object"===typeof b&&null!==b&&"number"===typeof b.timeout)b=d+b.timeout;
 else switch(f){case 1:b=d+-1;break;case 2:b=d+250;break;case 5:b=d+1073741823;break;case 4:b=d+1E4;break;default:b=d+5E3}a={callback:a,priorityLevel:f,expirationTime:b,next:null,previous:null};if(null===c)c=a.next=a.previous=a,u();else{d=null;var g=c;do{if(g.expirationTime>b){d=g;break}g=g.next}while(g!==c);null===d?d=c:d===c&&(c=a,u());b=d.previous;b.next=d.previous=a;a.next=d;a.previous=b}return a},unstable_runWithPriority:function(a,b){switch(a){case 1:case 2:case 3:case 4:case 5:break;default:a=
 3}var d=f,c=k;f=a;k=l();try{return b()}finally{f=d,k=c,F()}},unstable_next:function(a){switch(f){case 1:case 2:case 3:var b=3;break;default:b=f}var d=f,c=k;f=b;k=l();try{return a()}finally{f=d,k=c,F()}},unstable_wrapCallback:function(a){var b=f;return function(){var d=f,c=k;f=b;k=l();try{return a.apply(this,arguments)}finally{f=d,k=c,F()}}},unstable_getFirstCallbackNode:function(){return c},unstable_pauseExecution:function(){},unstable_continueExecution:function(){null!==c&&u()},unstable_getCurrentPriorityLevel:function(){return f},
 unstable_IdlePriority:5,unstable_ImmediatePriority:1,unstable_LowPriority:4,unstable_NormalPriority:3,unstable_UserBlockingPriority:2},SchedulerTracing:{__interactionsRef:null,__subscriberRef:null,unstable_clear:function(a){return a()},unstable_getCurrent:function(){return null},unstable_getThreadID:function(){return++Oa},unstable_subscribe:function(a){},unstable_trace:function(a,b,d){return d()},unstable_unsubscribe:function(a){},unstable_wrap:function(a){return a}}});var fa=Object.prototype.hasOwnProperty,
 ha={key:!0,ref:!0,__self:!0,__source:!0},la=/\/+/g,I=[];r={Children:{map:function(a,b,d){if(null==a)return a;var c=[];W(a,c,null,b,d);return c},forEach:function(a,b,d){if(null==a)return a;b=ia(null,null,b,d);V(a,xa,b);ja(b)},count:function(a){return V(a,function(){return null},null)},toArray:function(a){var b=[];W(a,b,null,function(a){return a});return b},only:function(a){S(a)?void 0:q("143");return a}},createRef:function(){return{current:null}},Component:t,PureComponent:O,createContext:function(a,
 b){void 0===b&&(b=null);a={$$typeof:Ba,_calculateChangedBits:b,_currentValue:a,_currentValue2:a,_threadCount:0,Provider:null,Consumer:null};a.Provider={$$typeof:Aa,_context:a};return a.Consumer=a},forwardRef:function(a){return{$$typeof:Da,render:a}},lazy:function(a){return{$$typeof:Ga,_ctor:a,_status:-1,_result:null}},memo:function(a,b){return{$$typeof:Fa,type:a,compare:void 0===b?null:b}},useCallback:function(a,b){return m().useCallback(a,b)},useContext:function(a,b){return m().useContext(a,b)},
 useEffect:function(a,b){return m().useEffect(a,b)},useImperativeHandle:function(a,b,d){return m().useImperativeHandle(a,b,d)},useDebugValue:function(a,b){},useLayoutEffect:function(a,b){return m().useLayoutEffect(a,b)},useMemo:function(a,b){return m().useMemo(a,b)},useReducer:function(a,b,d){return m().useReducer(a,b,d)},useRef:function(a){return m().useRef(a)},useState:function(a){return m().useState(a)},Fragment:r,StrictMode:X,Suspense:Ea,createElement:ea,cloneElement:function(a,b,d){null===a||
 void 0===a?q("267",a):void 0;var c=void 0,e=J({},a.props),f=a.key,k=a.ref,h=a._owner;if(null!=b){void 0!==b.ref&&(k=b.ref,h=R.current);void 0!==b.key&&(f=""+b.key);var l=void 0;a.type&&a.type.defaultProps&&(l=a.type.defaultProps);for(c in b)fa.call(b,c)&&!ha.hasOwnProperty(c)&&(e[c]=void 0===b[c]&&void 0!==l?l[c]:b[c])}c=arguments.length-2;if(1===c)e.children=d;else if(1<c){l=Array(c);for(var m=0;m<c;m++)l[m]=arguments[m+2];e.children=l}return{$$typeof:y,type:a.type,key:f,ref:k,props:e,_owner:h}},
 createFactory:function(a){var b=ea.bind(null,a);b.type=a;return b},isValidElement:S,version:"16.8.6",unstable_ConcurrentMode:Ca,unstable_Profiler:za,__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED:e};r=(X={default:r},r)||X;return r.default||r});
@@ -1,42 +0,0 @@
 .main {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: 220px 1fr;
 }
 .left-thing {
  background-color: gray;
  padding: 20px;
  color: white;
 }
 .left-thing button {
  width: 100%;
 }
 .right-thing {
  padding: 20px;
  overflow: auto;
 }
 /* Message widget */
 .message .author {
  font-weight: bold;
 }
 .message {
  width: 400px;
  background-color: lightblue;
  margin: 10px 5px;
  border-radius: 5px;
  padding: 5px;
 }
 .remove {
  float: right;
 }
@@ -1,49 +0,0 @@
 //------------------------------------------------------------------------------
 // Generating demo data
 //------------------------------------------------------------------------------
 const AUTHORS = ["Aaron", "David", "Vincent"];
 const CONTENT = [
  "Lorem ipsum dolor sit amet",
  "Sed ut perspiciatis unde omnis iste natus error sit voluptatem",
  "Excepteur sint occaecat cupidatat non proident"
 ];
 function chooseRandomly(array) {
  const index = Math.floor(Math.random() * array.length);
  return array[index];
 }
 let nextId = 1;
 export function buildData(n = 1000) {
  const data = [];
  for (let i = 0; i < n; i++) {
      let id = nextId++;
    data.push({
      id: id,
      author: chooseRandomly(AUTHORS),
      msg: `${id}: ${chooseRandomly(CONTENT)}`,
      likes: 0
    });
  }
  return data;
 }
 //------------------------------------------------------------------------------
 // Measuring helpers
 //------------------------------------------------------------------------------
 let startTime;
 let lastMeasure;
 export function startMeasure(descr) {
  startTime = performance.now();
  lastMeasure = descr;
 }
 export function stopMeasure() {
  let last = lastMeasure;
  if (lastMeasure) {
    window.setTimeout(function() {
      lastMeasure = null;
      const stop = performance.now();
      console.log(`[${last}] took  ${Number(stop - startTime).toFixed()}ms`);
    }, 0);
  }
 }
@@ -1,106 +0,0 @@
 import { buildData, startMeasure, stopMeasure } from "../shared/utils.js";
 //------------------------------------------------------------------------------
 // Counter Widget
 //------------------------------------------------------------------------------
 Vue.component("likes-counter", {
  data: function() {
    return {
      counter: 0
    };
  },
  methods: {
    increment() {
      this.counter++;
    }
  },
  template: `
    <div>
      <button @click="increment">Value: {{counter}}</button>
    </div>`
 });
 //------------------------------------------------------------------------------
 // Message Widget
 //------------------------------------------------------------------------------
 Vue.component("my-message", {
  props: ["msg"],
  methods: {
    removeMessage() {
      this.$emit("removeMessage", this.msg.id);
    }
  },
  template: `
    <div class="message">
        <span class="author">{{msg.author}}</span>
        <span class="msg">{{msg.msg}}</span>
        <button class="remove" @click="removeMessage">Remove</button>
        <likes-counter></likes-counter>
    </div>`
 });
 //------------------------------------------------------------------------------
 // Root Widget
 //------------------------------------------------------------------------------
 const App = {
  name: "App",
  data() {
    return { messages: [] };
  },
  methods: {
    addMessages(n) {
      startMeasure("add " + n);
      const newMessages = buildData(n);
      this.messages.push.apply(this.messages, newMessages);
      stopMeasure();
    },
    clear() {
      startMeasure("clear");
      this.messages = [];
      stopMeasure();
    },
    updateSomeMessages() {
      startMeasure("update every 10th");
      const messages = this.messages;
      for (let i = 0; i < this.messages.length; i += 10) {
        messages[i].author += "!!!";
      }
      stopMeasure();
    },
    removeMessage(id) {
      startMeasure("remove message");
      const index = this.messages.findIndex(m => m.id === id);
      this.messages.splice(index, 1);
      stopMeasure();
    }
  },
  template: `
    <div class="main">
        <div class="left-thing">
            <div>Number of msg: {{messages.length}}</div>
            <button @click="addMessages(100)">Add 100 messages</button>
            <button @click="addMessages(1000)">Add 1000 messages</button>
            <button @click="addMessages(10000)">Add 10000 messages</button>
            <button @click="addMessages(50000)">Add 50000 messages</button>
            <button @click="updateSomeMessages">Update every 10th message</button>
            <button @click="clear">Clear</button>
        </div>
        <div class="right-thing">
            <div class="content">
                <my-message v-for="msg in messages" v-bind:key="msg.id" v-bind:msg="msg" @removeMessage="removeMessage"></my-message>
            </div>
        </div>
    </div>
  `
 };
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 new Vue({
  render: h => h(App)
 }).$mount(`#main`);
@@ -1,13 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>Vue.js Benchmark</title>
  <link href="../shared/main.css" rel="stylesheet"/>
  <script src='vue.min.js'></script>
 </head>
 <body>
  <div id='main'></div>
  <script src='app.js' type="module"></script>
 </body>
 </html>
@@ -1,29 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>OWL Extras</title>
 </head>
 <body>
  <h1>🦉 OWL Extra Stuff 🦉</h1>
  <h2>Benchmarks</h2>
  <p>The goal is to compare some operations on large lists</p>
  <ul>
    <li><a href="benchmarks/odoo-widgets-12.0">Odoo Widgets (12.0)</a></li>
    <li><a href="benchmarks/odoo-widgets-12.3">Odoo Widgets (12.3)</a></li>
    <li><a href="benchmarks/owl-0.7.0">OWL 0.7.0</a></li>
    <li><a href="benchmarks/owl-0.8.0">OWL 0.8.0</a></li>
    <li><a href="benchmarks/owl-0.9.0">OWL 0.9.0</a></li>
    <li><a href="benchmarks/owl-0.10.0">OWL 0.10.0</a></li>
    <li><a href="benchmarks/owl-master">OWL Master</a></li>
    <li><a href="benchmarks/vue">Vue</a></li>
    <li><a href="benchmarks/react">React</a></li>
  </ul>
  <h2>Playground</h2>
  <a href="playground">Playground</a>
 </body>
 </html>
@@ -1,359 +0,0 @@
 import { SAMPLES } from "./samples.js";
 //------------------------------------------------------------------------------
 // Constants, helpers, utils
 //------------------------------------------------------------------------------
 let owlJS;
 async function owlSourceCode() {
  if (owlJS) {
    return owlJS;
  }
  const result = await fetch("../owl.js");
  owlJS = await result.text();
  return owlJS;
 }
 const MODES = {
  js: "ace/mode/javascript",
  css: "ace/mode/css",
  xml: "ace/mode/xml"
 };
 const DEFAULT_XML = `<templates>
 </templates>`;
 const DEFAULT_HTML = `<!DOCTYPE html>
 <html lang="en">
  <head>
    <meta charset="utf-8">
    <title>OWL App</title>
    <link rel="icon" href="data:,">
    <script src="owl.js"></script>
    <link rel="stylesheet" href="app.css">
    <script src="app.js"></script>
  </head>
  <body>
  </body>
 </html>
 `;
 const APP_PY = `import sys
 import thread
 import webbrowser
 import time
 import BaseHTTPServer, SimpleHTTPServer
 def start_server():
    httpd = BaseHTTPServer.HTTPServer(('127.0.0.1', 3600), SimpleHTTPServer.SimpleHTTPRequestHandler)
    httpd.serve_forever()
 thread.start_new_thread(start_server,())
 url = 'http://127.0.0.1:3600'
 webbrowser.open_new(url)
 while True:
    try:
        time.sleep(1)
    except KeyboardInterrupt:
        sys.exit(0)
 `;
 /**
 * Make an iframe, with all the js, css and xml properly injected.
 */
 function makeCodeIframe(js, css, xml, errorHandler) {
  // check templates
  var qweb = new owl.QWeb();
  const sanitizedXML = xml.replace(/<!--[\s\S]*?-->/g, "");
  // will throw error if there is something wrong with xml
  qweb.addTemplates(sanitizedXML);
  // create iframe
  const iframe = document.createElement("iframe");
  iframe.onload = () => {
    const doc = iframe.contentDocument;
    // inject js
    const owlScript = doc.createElement("script");
    owlScript.type = "text/javascript";
    owlScript.src = "../owl.js";
    owlScript.addEventListener("load", () => {
      const script = doc.createElement("script");
      script.type = "text/javascript";
      const content = `window.TEMPLATES = \`${sanitizedXML}\`\n${js}`;
      script.innerHTML = content;
      iframe.contentWindow.addEventListener("error", errorHandler);
      iframe.contentWindow.addEventListener("unhandledrejection", errorHandler);
      setTimeout(function() {
        if (iframe.contentWindow) {
          iframe.contentWindow.removeEventListener("error", errorHandler);
          iframe.contentWindow.removeEventListener(
            "unhandledrejection",
            errorHandler
          );
        }
      }, 200);
      doc.body.appendChild(script);
    });
    doc.head.appendChild(owlScript);
    // inject css
    const style = document.createElement("style");
    style.innerHTML = css;
    doc.head.appendChild(style);
  };
  return iframe;
 }
 /**
 * Make a zip file containing a functioning application
 */
 async function makeApp(js, css, xml) {
  await owl.utils.loadJS("libs/jszip.min.js");
  const zip = new JSZip();
  const processedJS = js
    .split("\n")
    .map(l => (l === "" ? "" : "  " + l))
    .join("\n");
  const JS = `async function startApp() {
  // Loading templates
  let TEMPLATES;
  try {
    TEMPLATES = await owl.utils.loadTemplates('app.xml');
  } catch(e) {
    document.write(\`This app requires a static server.  If you have python installed, try 'python app.py'\`);
    return;
  }
  // Application code
 ${processedJS}
 }
 // wait for DOM ready before starting
 owl.utils.whenReady(startApp);`;
  zip.file("app.js", JS);
  zip.file("app.css", css);
  zip.file("app.py", APP_PY);
  zip.file("app.xml", xml);
  zip.file("index.html", DEFAULT_HTML);
  zip.file("owl.js", owlSourceCode());
  return zip.generateAsync({ type: "blob" });
 }
 //------------------------------------------------------------------------------
 // MAIN APP
 //------------------------------------------------------------------------------
 class App extends owl.Component {
  constructor(...args) {
    super(...args);
    this.version = owl._version;
    this.SAMPLES = SAMPLES;
    this.widgets = { TabbedEditor };
    this.state = {
      js: SAMPLES[0].code,
      css: SAMPLES[0].css || "",
      xml: SAMPLES[0].xml || DEFAULT_XML,
      error: false,
      displayWelcome: true,
      splitLayout: true,
      leftPaneWidth: Math.ceil(window.innerWidth / 2),
      topPanelHeight: null
    };
    this.toggleLayout = owl.utils.debounce(this.toggleLayout, 250, true);
    this.runCode = owl.utils.debounce(this.runCode, 250, true);
    this.downloadCode = owl.utils.debounce(this.downloadCode, 250, true);
  }
  displayError(error) {
    this.state.error = error;
    if (error) {
      setTimeout(() => {
        this.refs.content.innerHTML = "";
      });
      return;
    }
  }
  runCode() {
    this.state.displayWelcome = false;
    let subiframe;
    let error = false;
    const errorHandler = e => this.displayError(e.message || e.reason.message);
    try {
      const { js, css, xml } = this.state;
      subiframe = makeCodeIframe(js, css, xml, errorHandler);
    } catch (e) {
      //probably problem with the templates
      error = e;
    }
    if (error) {
      this.displayError(error.message);
      return;
    } else {
      this.state.error = false;
    }
    this.refs.content.innerHTML = "";
    this.refs.content.appendChild(subiframe);
  }
  setSample(ev) {
    const sample = SAMPLES.find(s => s.description === ev.target.value);
    this.state.js = sample.code;
    this.state.css = sample.css || "";
    this.state.xml = sample.xml || DEFAULT_XML;
  }
  get leftPaneStyle() {
    return `width:${this.state.leftPaneWidth}px`;
  }
  get rightPaneStyle() {
    return `width:${window.innerWidth - 6 - this.state.leftPaneWidth}px`;
  }
  get topEditorStyle() {
    return `flex: 0 0 ${this.state.topPanelHeight}px`;
  }
  onMouseDown() {
    const resizer = ev => {
      this.state.leftPaneWidth = ev.clientX;
    };
    document.body.addEventListener("mousemove", resizer);
    for (let iframe of document.getElementsByTagName("iframe")) {
      iframe.classList.add("disabled");
    }
    document.body.addEventListener("mouseup", () => {
      document.body.removeEventListener("mousemove", resizer);
      for (let iframe of document.getElementsByTagName("iframe")) {
        iframe.classList.remove("disabled");
      }
    });
  }
  updateCode(ev) {
    this.state[ev.type] = ev.value;
  }
  toggleLayout() {
    this.state.splitLayout = !this.state.splitLayout;
  }
  updatePanelHeight(ev) {
    if (!ev.delta) {
      return;
    }
    let height = this.state.topPanelHeight;
    if (!height) {
      height = document.getElementsByClassName("tabbed-editor")[0].clientHeight;
    }
    this.state.topPanelHeight = height + ev.delta;
  }
  async downloadCode() {
    const { js, css, xml } = this.state;
    const content = await makeApp(js, css, xml);
    await owl.utils.loadJS("libs/FileSaver.min.js");
    saveAs(content, "app.zip");
  }
 }
 //------------------------------------------------------------------------------
 // Tabbed editor
 //------------------------------------------------------------------------------
 class TabbedEditor extends owl.Component {
  constructor(parent, props) {
    super(parent, props);
    this.state = {
      currentTab: props.js ? "js" : props.xml ? "xml" : "css"
    };
    this.setTab = owl.utils.debounce(this.setTab, 250, true);
    this.sessions = {};
    for (let tab of ["js", "xml", "css"]) {
      if (props[tab]) {
        this.sessions[tab] = new ace.EditSession(props[tab], MODES[tab]);
        this.sessions[tab].setOption("useWorker", false);
        const tabSize = tab === "xml" ? 2 : 4;
        this.sessions[tab].setOption("tabSize", tabSize);
        this.sessions[tab].setUndoManager(new ace.UndoManager());
      }
    }
  }
  mounted() {
    this.editor = ace.edit(this.refs.editor);
    this.editor.setValue(this.props[this.state.currentTab], -1);
    this.editor.setFontSize("12px");
    this.editor.setTheme("ace/theme/monokai");
    this.editor.setSession(this.sessions[this.state.currentTab]);
    const tabSize = this.state.currentTab === "xml" ? 2 : 4;
    this.editor.session.setOption("tabSize", tabSize);
    this.editor.on("blur", () => {
      const editorValue = this.editor.getValue();
      const propsValue = this.props[this.state.currentTab];
      if (editorValue !== propsValue) {
        this.trigger("updateCode", {
          type: this.state.currentTab,
          value: editorValue
        });
      }
    });
  }
  patched() {
    const session = this.sessions[this.state.currentTab];
    session.setValue(this.props[this.state.currentTab], -1);
    this.editor.setSession(session);
  }
  willUnmount() {
    this.editor.destroy();
    delete this.editor;
  }
  setTab(tab) {
      if (this.state.currentTab !== tab) {
        this.state.currentTab = tab;
        const session = this.sessions[this.state.currentTab];
        session.doc.setValue(this.props[tab], -1);
        this.editor.setSession(session);
      }
  }
  onMouseDown(ev) {
    if (ev.target.tagName === "DIV") {
      let y = ev.clientY;
      const resizer = ev => {
        const delta = ev.clientY - y;
        y = ev.clientY;
        this.trigger("updatePanelHeight", { delta });
      };
      document.body.addEventListener("mousemove", resizer);
      document.body.addEventListener("mouseup", () => {
        document.body.removeEventListener("mousemove", resizer);
      });
    }
  }
 }
 //------------------------------------------------------------------------------
 // Application initialization
 //------------------------------------------------------------------------------
 document.title = `${document.title} (v${owl._version})`;
 document.addEventListener("DOMContentLoaded", async function() {
  const templates = await owl.utils.loadTemplates("templates.xml");
  const qweb = new owl.QWeb(templates);
  const env = { qweb };
  const app = new App(env);
  app.mount(document.body);
 });
@@ -1,21 +0,0 @@
 # 🦉 Extra Stuff 🦉
 To help work/improve/learn with OWL, we have here:
 - a benchmarks application
 - a playground application
 Both of them 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 extras` (and its version with a watcher: `npm run extras:watch`).
 ## Benchmarks
 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.
 ## Playground
 The playground is an important application designed to help learning and
 experimenting with Owl.  It is available [online](https://odoo.github.io/owl/playground/).
@@ -1,38 +0,0 @@
 import sys
 import thread
 import webbrowser
 import time
 import BaseHTTPServer
 import SimpleHTTPServer
 HOST = '127.0.0.1'
 PORT = 8000
 URL = 'http://{0}:{1}/extras'.format(HOST, PORT)
 # We define our own handler here to remap owl.js GET requests to the Owl build
 # in dist/.  This is useful for the benchmarks and playground applications.
 # With this, we can simply copy the playground folder as is in the gh-page when
 # we want to update the playground.
 class OWLHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/extras/owl.js':
            self.path = '/dist/owl.js'
        return SimpleHTTPServer.SimpleHTTPRequestHandler.do_GET(self)
 def start_server():
    httpd = BaseHTTPServer.HTTPServer((HOST, PORT), OWLHandler)
    httpd.serve_forever()
 if __name__ == "__main__":
    thread.start_new_thread(start_server, ())
    webbrowser.open_new(URL)
    while True:
        try:
            time.sleep(1)
        except KeyboardInterrupt:
            sys.exit(0)
@@ -1,54 +1,73 @@
 {
-  "name": "owl",
+  "name": "@odoo/owl",
-  "version": "0.11.0",
+  "version": "2.0.0-alpha1",
  "description": "Odoo Web Library (OWL)",
-  "main": "src/index.ts",
+  "main": "dist/owl.cjs.js",
  "browser": "dist/owl.iife.js",
  "module": "dist/owl.es.js",
  "types": "dist/types/index.d.ts",
  "files": [
    "dist"
  ],
  "engines": {
    "node": ">=12.18.3"
  },
  "scripts": {
    "build:js": "tsc --target esnext --module es6 --outDir dist/owl src/*",
    "build:bundle": "rollup -c",
-    "build": "npm run build:js && npm run build:bundle",
+    "build": "npm run build:bundle",
    "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",
    "test:watch": "jest --watch",
-    "extras:serve": "python extras/server.py",
+    "playground:serve": "python3 tools/server.py || python tools/server.py",
-    "extras": "npm run build && npm run extras:serve",
+    "playground": "npm run build && npm run playground:serve",
-    "extras:watch": "npm-run-all  --parallel extras:serve \"build:* -- --watch\""
+    "preplayground:watch": "npm run build",
    "playground:watch": "npm-run-all  --parallel playground:serve \"build:* -- --watch\"",
    "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": "GPL-3.0-or-later",
+  "license": "LGPL-3.0-only",
  "bugs": {
    "url": "https://github.com/odoo/owl/issues"
  },
  "homepage": "https://github.com/odoo/owl#readme",
  "devDependencies": {
-    "@types/jest": "^23.3.12",
+    "@types/jest": "^27.0.1",
    "@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",
-    "jest": "^23.6.0",
+    "github-api": "^3.3.0",
    "jest": "^27.1.0",
    "jest-environment-jsdom": "^27.1.0",
    "live-server": "^1.2.1",
    "npm-run-all": "^4.1.5",
-    "rollup": "^1.6.0",
+    "prettier": "2.4.1",
-    "rollup-plugin-typescript2": "^0.20.1",
+    "rollup": "^2.56.3",
    "rollup-plugin-terser": "^7.0.2",
    "rollup-plugin-typescript2": "^0.31.1",
    "sass": "^1.16.1",
    "snabbdom-to-html": "^5.1.1",
    "source-map-support": "^0.5.10",
-    "ts-jest": "^23.10.5",
+    "ts-jest": "^27.0.5",
-    "typescript": "^3.2.2",
+    "typescript": "4.5.2",
    "uglify-es": "^3.3.9"
  },
  "dependencies": {
    "jest-environment-jsdom": "^24.7.1",
    "snabbdom": "^0.7.3"
  },
  "jest": {
    "testEnvironment": "jsdom",
    "roots": [
      "<rootDir>/src",
      "<rootDir>/tests"
    ],
    "setupFiles": [
      "./tests/mocks/mockEventTarget.js"
    ],
    "transform": {
      "^.+\\.ts?$": "ts-jest"
    },
@@ -62,5 +81,9 @@
      "json",
      "node"
    ]
  },
  "prettier": {
    "printWidth": 100,
    "endOfLine": "auto"
  }
 }
@@ -0,0 +1,28 @@
 # 🦉 OWL Roadmap 🦉
 - Current version: 1.4.7
 - Status: stable
 This roadmap is only an attempt at predicting Owl's future.  Everything may
 change!
 ### 1.x
 - add chrome and firefox devtools,
 - fix every bugs,
 - improve documentation,
 - small backward compatible improvements.
 ### 2.x (2020? 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
  much faster
 - refactor `QWeb` to use an intermediate representation (some kind of AST) to
  allow additional optimisations.
@@ -1,14 +1,71 @@
-import { version } from "./package.json";
+import pkg 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 = '${git.short()}';
 __info__.url = 'https://github.com/odoo/owl';
 `;
 /**
 * Generate from a string depicting a path a new path for the minified version.
 * @param {string} pkgFileName file name
 */
 function generateMinifiedNameFromPkgName(pkgFileName) {
  const parts = pkgFileName.split('.');
  parts.splice(parts.length - 1, 0, "min");
  return parts.join('.');
 }
 /**
 * Get the rollup config based on the arguments
 * @param {string} format format of the bundle
 * @param {string} generatedFileName generated file name
 * @param {boolean} minified should it be minified
 */
 function getConfigForFormat(format, generatedFileName, minified = false) {
  return {
    file: minified ? generateMinifiedNameFromPkgName(generatedFileName) : generatedFileName,
    format: format,
    name: name,
    extend: extend,
    outro: outro,
    freeze: false,
    plugins: minified ? [terser()] : [],
    indent: '    ', // indent with 4 spaces
  };
 }
 // rollup.config.js
 export default {
-  input: "dist/owl/index.js",
+  input: "src/index.ts",
-  output: {
+  output: [
-    file: "dist/owl.js",
+
-    format: "iife",
+    /**
-    name: "owl",
+     * Read about module formats:
-    extend: true,
+     *  https://auth0.com/blog/javascript-module-systems-showdown/
-    outro: `exports._version = '${version}';\nexports._date = '${new Date().toISOString()}';\nexports._hash = '${git.short()}';\nexports._url = 'https://github.com/odoo/owl';`
+     *  https://medium.com/@kelin2025/so-you-wanna-use-es6-modules-714f48b3a953
-  }
+     */
    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
    }),
  ]
 };
@@ -0,0 +1,76 @@
 import { Component } from "../component/component";
 import { ComponentNode } from "../component/component_node";
 import { MountOptions } from "../component/fibers";
 import { Scheduler } from "../component/scheduler";
 import { TemplateSet } from "./template_set";
 // reimplement dev mode stuff see last change in 0f7a8289a6fb8387c3c1af41c6664b2a8448758f
 export interface Env {
  [key: string]: any;
 }
 export interface AppConfig {
  dev?: boolean;
  env?: Env;
  translatableAttributes?: string[];
  translateFn?: (s: string) => string;
  templates?: string | Document;
 }
 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 = Object.freeze({});
  scheduler = new Scheduler(window.requestAnimationFrame.bind(window));
  root: ComponentNode | null = null;
  constructor(Root: T, props?: any) {
    super();
    this.Root = Root;
    this.props = props;
  }
  configure(config: AppConfig): App<T> {
    if (config.dev) {
      this.dev = config.dev;
      console.info(DEV_MSG);
    }
    if (config.env) {
      this.env = Object.freeze(Object.assign({}, config.env));
    }
    if (config.translateFn) {
      this.translateFn = config.translateFn;
    }
    if (config.translatableAttributes) {
      this.translatableAttributes = config.translatableAttributes;
    }
    if (config.templates) {
      this.addTemplates(config.templates);
    }
    return this;
  }
  mount(target: HTMLElement, options?: MountOptions): Promise<InstanceType<T>> {
    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");
    }
    const node = new ComponentNode(this.Root, this.props, this);
    this.root = node;
    return node.mountComponent(target, options);
  }
  destroy() {
    if (this.root) {
      this.root.destroy();
    }
  }
 }
@@ -0,0 +1,140 @@
 import { BDom, multi, text, toggler } from "../blockdom";
 import { validateProps } from "../component/props_validation";
 import { Markup } from "../utils";
 import { html } from "../blockdom/index";
 /**
 * 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 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;
 }
 /*
 * 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 (typeof value === "string") {
    safeKey = "string_unsafe";
    block = text(value);
  } else {
    // Assuming it is a block
    safeKey = "block_safe";
    block = value;
  }
  return toggler(safeKey, block);
 }
 export const UTILS = {
  withDefault,
  zero: Symbol("zero"),
  isBoundary,
  callSlot,
  capture,
  withKey,
  prepareList,
  setContextValue,
  shallowEqual,
  toNumber,
  validateProps,
  safeOutput,
 };
@@ -0,0 +1,99 @@
 import { createBlock, html, list, multi, text, toggler } 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 };
 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 class TemplateSet {
  rawTemplates: typeof globalTemplates = Object.create(globalTemplates);
  templates: { [name: string]: Template } = {};
  translateFn?: (s: string) => string;
  translatableAttributes?: string[];
  utils: typeof UTILS;
  dev?: boolean;
  constructor() {
    const call = (subTemplate: string, ctx: any, parent: any) => {
      const template = this.getTemplate(subTemplate);
      return toggler(subTemplate, template(ctx, parent));
    };
    const getTemplate = (name: string) => this.getTemplate(name);
    this.utils = Object.assign({}, UTILS, { getTemplate, call });
  }
  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 = compile(rawTemplate, {
        name,
        dev: this.dev,
        translateFn: this.translateFn,
        translatableAttributes: this.translatableAttributes,
      });
      // 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];
  }
 }
@@ -0,0 +1,155 @@
 import type { Setter } from "./block_compiler";
 const { setAttribute, 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.
 */
 export function createAttrUpdater(attr: string): Setter<HTMLElement> {
  return function (this: HTMLElement, value: any) {
    if (value !== false) {
      setAttribute.call(this, attr, value === true ? "" : 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;
 }
@@ -0,0 +1,613 @@
 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): 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);
  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[];
  forceRef?: 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 isActive = false;
      let currentNS = parent && parent.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("");
        isActive = true;
      }
      if (tagName.startsWith("block-child-")) {
        domParentTree!.forceRef = true;
        const index = parseInt(tagName.slice(12), 10);
        info.push({ type: "child", idx: index });
        el = document.createTextNode("");
        isActive = true;
      }
      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-")) {
            isActive = true;
            const idx = parseInt(attrName.slice(14), 10);
            info.push({
              type: "handler",
              idx,
              event: attrValue,
            });
          } else if (attrName.startsWith("block-attribute-")) {
            isActive = true;
            const idx = parseInt(attrName.slice(16), 10);
            info.push({
              type: "attribute",
              idx,
              name: attrValue,
              tag: tagName,
            });
          } else if (attrName === "block-attributes") {
            isActive = true;
            info.push({
              type: "attributes",
              idx: parseInt(attrValue, 10),
            });
          } else if (attrName === "block-ref") {
            isActive = true;
            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: isActive ? 1 : 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 });
          isActive = true;
          tree.refN = 1;
        } 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 (isActive) {
        let cur: IntermediateTree | null = tree;
        while ((cur = cur.parent)) {
          cur.refN++;
        }
      }
      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 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,
  toIdx?: 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;
    toIdx = tree.refN - 1;
  }
  if (tree.refN) {
    const initialIdx = fromIdx!;
    const isRef = tree.forceRef || tree.info.length > 0;
    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, toIdx);
    }
    // left
    if (firstChild) {
      ctx.collectors.push({ idx: fromIdx!, prevIdx: initialIdx, getVal: nodeGetFirstChild });
      buildContext(tree.firstChild!, ctx, fromIdx!, toIdx! - nextSibling);
    }
  }
  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): 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;
    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() {
      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);
 }
@@ -0,0 +1,28 @@
 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;
  },
 };
@@ -0,0 +1,90 @@
 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;
 }
@@ -0,0 +1,87 @@
 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);
 }
@@ -0,0 +1,44 @@
 export { config } from "./config";
 export { toggler } from "./toggler";
 export { createBlock } from "./block_compiler";
 export { list } from "./list";
 export { multi } from "./multi";
 export { text } 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;
 }
--- a/Show More
+++ b/Show More
		`@@ -1,3 +0,0 @@`
			`# 🦉 VDom 🦉`

			`Owl's virtual dom is a fork of [snabbdom](https://github.com/snabbdom/snabbdom).`