[IMP] compiler: add support for t-for directive

This commit adds support for the `t-for` whose syntax and usage is
similar to the syntax of the for..of loop in JS (and in fact it compiles
to a for..of loop). This looping construct supports looping on arbitrary
iterables and destructuring assignments, which would be difficult to
support in a backward compatible manner on the existing t-foreach
directive.

.gitignore

@@ -15,7 +15,7 @@ yarn-debug.log*
 yarn-error.log*
 
 #ide's
-**/.vscode/*
+.vscode
 .idea
 
 node_modules
@@ -26,10 +26,3 @@ release-notes.md
 
 # useful in some cases
 /temp
-
-# owl-vision
-*/owl-vision/out/
-*/owl-vision/.vs/
-**/*.vsix
-!*/owl-vision/.vscode/launch.json
-!*/owl-vision/.vscode/tasks.json

doc/reference/app.md

@@ -61,8 +61,6 @@ The `config` object is an object with some of the following keys:
   templates (see [translations](translations.md))
 - **`templates (string | xml document)`**: all the templates that will be used by
   the components created by the application.
-- **`getTemplate ((s: string) => Element | Function | string | void)`**: a function that will be called by owl when it
-  needs a template. If undefined is returned, owl looks into the app templates.
 - **`warnIfNoStaticProps (boolean, default=false)`**: if true, Owl will log a warning
   whenever it encounters a component that does not provide a [static props description](props.md#props-validation).
 
@@ -119,7 +117,7 @@ const { loadFile, mount } = owl;
 Dev mode activates some additional checks and developer amenities:
 
 - [Props validation](./props.md#props-validation) is performed
-- [t-foreach](./templates.md#loops) loops check for key unicity
+- [t-for and t-foreach](./templates.md#loops) loops check for key unicity
 - Lifecycle hooks are wrapped to report their errors in a more developer-friendly way
 - onWillStart and onWillUpdateProps will emit a warning in the console when they
   take longer than 3 seconds in an effort to ease debugging the presence of deadlocks

doc/reference/component.md

@@ -357,7 +357,7 @@ cleaning operation, since the component may be destroyed before it has even been
 mounted. The `willDestroy` hook is useful in that situation, since it is always
 called.
 
-The `onWillDestroy` hook is used to register a function that will be executed at
+The `onWillUnmount` hook is used to register a function that will be executed at
 this moment:
 
 ```javascript

doc/reference/error_handling.md

@@ -51,8 +51,8 @@ that render its content, and a fallback if an error happened.
 ```js
 class ErrorBoundary extends Component {
   static template = xml`
-    <t t-if="state.error" t-slot="fallback">An error occurred</t>
-    <t t-else="" t-slot="default"/>`;
+    <t t-if="error" t-slot="fallback">An error occurred</t>
+    <t t-else="" t-slot="content"`;
 
   setup() {
     this.state = useState({ error: false });

doc/reference/hooks.md

@@ -190,13 +190,12 @@ will then be updated accordingly.
 ### `useExternalListener`
 
 The `useExternalListener` hook helps solve a very common problem: adding and removing
-a listener on some target whenever a component is mounted/unmounted. It takes a target
-as its first argument, forwards the other arguments to `addEventListener`. For example,
+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, { capture: true });
+useExternalListener(window, "click", this.closeMenu);
 ```
 
 ### `useComponent`

doc/reference/reactivity.md

@@ -152,7 +152,7 @@ This may seem counter-intuitive, but it makes perfect sense in the context of co
 ```js
 class DoubleCounter extends Component {
   static template = xml`
-    <t t-esc="'selected: ' + state.selected + ', value: ' + state[state.selected]"/>
+    <t t-esc="state.selected + ': ' + state[state.selected].value"/>
     <button t-on-click="() => this.state.count1++">increment count 1</button>
     <button t-on-click="() => this.state.count2++">increment count 2</button>
     <button t-on-click="changeCounter">Switch counter</button>

doc/reference/templates.md

@@ -61,7 +61,7 @@ For reference, here is a list of all standard QWeb directives:
 | `t-out`                        | [Outputting value, possibly 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-for/t-of`, `t-foreach/t-as` | [Loops](#loops)                                                 |
 | `t-att`, `t-attf-*`, `t-att-*` | [Dynamic attributes](#dynamic-attributes)                       |
 | `t-call`                       | [Rendering sub templates](#sub-templates)                       |
 | `t-debug`, `t-log`             | [Debugging](#debugging)                                         |
@@ -372,6 +372,24 @@ Like conditions, `t-foreach` applies to the element bearing the directive’s at
 
 is equivalent to the previous example.
 
+Owl also has another pair of directives that can be used for looping that allow
+destructuring the contents of the loop item: `t-for` and `t-of`, which behaves
+much like `for..of` in javascript:
+
+```xml
+<t t-for="[left, right]" t-of="[['a', 1], ['b', 2], ['c', 3]]" t-key="left">
+    <p><t t-esc="left"/>: <t t-esc="right"/></p>
+</t>
+```
+
+will be rendered as:
+
+```xml
+<p>a: 1</p>
+<p>b: 2</p>
+<p>c: 3</p>
+```
+
 An important difference should be made with the usual `QWeb` behaviour: Owl
 requires the presence of a `t-key` directive, to be able to properly reconcile
 renderings.
@@ -380,8 +398,9 @@ renderings.
 and maps, it will expose the key of the current iteration as the contents of the
 `t-as`, and the corresponding value with the same name and the suffix `_value`.
 
-In addition to the name passed via t-as, `t-foreach` provides a few other useful
-variables (note: `$as` will be replaced with the name passed to `t-as`):
+In addition to the name passed via t-as, `t-foreach` (but not `t-for`) provides
+a few other useful variables (note: `$as` will be replaced with the name passed
+to `t-as`):
 
 - `$as_value`: the current iteration value, identical to `$as` for arrays and
   other iterables, but for objects and maps, it provides the value (where `$as`
@@ -393,10 +412,9 @@ variables (note: `$as` will be replaced with the name passed to `t-as`):
   (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.
+These variables and all new variables created inside`t-foreach` and `t-for` are
+only available inside of the loop. If a variable existed outside the context of
+the loop, the assignment will affect the outer variable.
 
 ```xml
 <t t-set="existing_variable" t-value="false"/>
@@ -408,7 +426,7 @@ into the global context.
     <!-- existing_variable and new_variable now true -->
 </p>
 
-<!-- existing_variable always true -->
+<!-- existing_variable still true -->
 <!-- new_variable undefined -->
 ```
 
@@ -471,18 +489,11 @@ are all equivalent:
 </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.
+The `t-key` directive is mandatory, and as mentioned should represent the object's
+identity. You may be tempted to use the loop index as a key, but keep in mind that
+this is only correct if items in the loop cannot be reordered. If this is not the
+case, using the index as the key can lead to bugs that are difficult to find, so
+use the index as the key only if you are sure items cannot be reordered.
 
 ### Sub Templates
 

doc/tools/devtools_guide.md

@@ -35,13 +35,13 @@ The components tab is separated into two sub windows: the components tree in the
 the component details in the right. The components tree will display all the different
 components that are present in the tab in the form of a tree. The root of this tree is
 actually the app which is not a component but can still be inspected by the devtools like
-one. There can also be multiple apps loaded in the page like in website:
+one. There can also be multiple apps loaded in the page like in the following:
 
 <img src="screenshots/multi_apps.png"/>
 
 There is a convenient search bar at the top of the components tree which will help finding
 the components tou want in the tree and also, an element picker can be used to directly select
-the component you want to focus on in the page which is especially useful when 1trying to find
+the component you want to focus on in the page which is especially useful when trying to find
 what you want. Just click on the elements picker icon and click on the element you want to focus
 on in the page and it will be selected in the devtools accordingly. Hovering any element in the
 page in this mode will highlight it and the same happens anytime in the components tree.
@@ -64,18 +64,25 @@ as its env, props, observed states and all the other variables that are present
 While the props and the env are already present on the actual instance of the component and are
 pretty explicit by themselves, the observed state value is a bit more complicated to grasp.
 
-The observed state is actually information about which variables are being observed by the component:
-when any property of a reactive object is being read by the component, the component will subscribe
-to this property which means it will listen to any change that can occur on the property and render
-when such a change occurs. This can be visualized easily within the devtools inside of the observed
-state section: observed properties of the reactive object(s) are displayed in bold while the others
-are greyed out. Do keep in mind that a greyed out property in the observed state of one component
-may be observed by another and the other way around is also possible. Here is an example for some
-user Field component:
+The observed state is actually information about which variables are observed by the component
+which will trigger a rerender of the component when it is modified. The keys represent which part of the
+variable is actually observed and the target is the actual variable. For simplicity, the properties
+that are not observed by the component are greyed out while the others are in bold. This means that
+editing bold ones will trigger a rerender while the greyed out ones will not.
 
 <img src="screenshots/states.png"/>
 
-Navigation inside the properties is also similar to the one in console variables: properties have
+In the given example, we have two keys/target pairs for two different variables. The first one indicates
+that adding or removing an element to the array will trigger a rerender since the length will have changed.
+Replacing the element at index 0, 1 or 2 will also have the same effect as implied by the keys. It doesn't
+mean that editing the properties of element at index 0, 1 or 2 will rerender the component though. It may
+be the case for some but this will be described in another keys/target pair. The second keys/target pair
+is actually the element at index 0 of the first pair. It only has id in the keys meaning that only the
+id property will actually trigger a rerender the component when modified. Be aware however that the other
+properties may be in the observed state of another component like a child one in this case. A greyed out
+property only implies it is not reactive for the selected component and not for the others.
+
+The navigation inside the properties is also similar to the one in console variables: properties have
 their prototype displayed and getters will get their value when clicked on (...). It is also possible to
 send any property to the console using the right-click context menu on it and functions can be inspected
 in the sources tab as well.
@@ -89,10 +96,8 @@ component's name. Using the left click on the component's name will focus it in
 It is also possible to edit any of the leaf node properties. To do so, you must double click on the
 property's value and modify it using the freshly created input then press enter to apply the changes.
 Do note that the modified values should be written in JSON format in order to be valid (examples:
-89, "yes", undefined, null, \["hello", 15\], {"a": 1}, true, ...). Editing any value will produce a
-manual render of the component (or the root component of the application in the case of env values).
-Whether the edition has an impact on the component or not and whether it produces an error is the
-responsability of the user.
+89, "yes", undefined, null, \["hello", 15\], {"a": 1}, true, ...). Whether it has an impact on the
+component or not and whether it produces an error is the responsability of the user.
 
 <img src="screenshots/edit.png"/>
 
@@ -112,8 +117,7 @@ are intercepted by the devtools using the record button.
 The second button is used to clear all the events that have been recorded. The select can be used to
 switch between the tree view (which shows the causality between renders) and the events log view which
 simply displays the events in the exact order they were triggered. In this view, you can expand the create,
-update and destroy events which reveals the component that initiated the event. Also, a transition line will
-appear each time a new animation frame has been loaded between events.
+update and destroy events which reveals the component that initiated the event.
 
 <img src="screenshots/events_log.png"/>
 
@@ -127,29 +131,20 @@ There is also the Trace Renderings and Trace Subscriptions features. These featu
 recording of events and have no effect on the profiler tab. The Trace Renderings option is used to log in
 the console all the render events and allows to show their traceback information. Similarly, the Trace
 Subscriptions option logs all the properties that caused a render event and also allows to see the traceback
-of the modification.
+of the modification
 
 <img src="screenshots/trace_rendering.png"/>
 <img src="screenshots/trace_subscriptions.png"/>
 
-The Owl Devtools also allow to inspect iframes coded in Owl: when an Owl iframe is detected in the page,
-the iframe selector will appear next to the tabs. This allows to switch from an iframe to another easily.
-Be aware that switching iframes will clear all record events from the profiler tab. Iframes detection is
-currently not working in the firefox version, we are aware of this issue and will try to address it in the
-future.
-
-<img src="screenshots/iframes.png"/>
-
 ## Options
 
 The owl devtools extension has a dark mode feature which defaults to your general devtools settings and can
-be toggled using the sun/moon icon at the top-right corner of the tab. There is also a refresh button to
-completely reset the owl devtools.
+be toggled using the sun/moon icon at the top-right corner of the tab. All the examples above were created
+with the dark mode enabled. There is also a refresh button to completely reset the owl devtools.
 
 <img src="screenshots/darkmode.png"/>
 
 ## Troubleshooting
 
-If the feedback from the page to the devtools seems to be cut, you can first try to use the refresh
-button mentioned above but if it still doesn't seem to work, just close the devtools and refresh the page.
+If the feedback from the page to the devtools seems to be cut, just close the devtools and refresh the page.
 This will eventually happen any time a tab stays opened for too long without being refreshed.

docs/owl.js

@@ -82,6 +82,67 @@ function toggler(key, child) {
 
 // Custom error class that wraps error that happen in the owl lifecycle
 class OwlError extends Error {
+}
+// Maps fibers to thrown errors
+const fibersInError = new WeakMap();
+const nodeErrorHandlers = new WeakMap();
+function _handleError(node, error) {
+    if (!node) {
+        return false;
+    }
+    const fiber = node.fiber;
+    if (fiber) {
+        fibersInError.set(fiber, error);
+    }
+    const errorHandlers = nodeErrorHandlers.get(node);
+    if (errorHandlers) {
+        let handled = false;
+        // execute in the opposite order
+        for (let i = errorHandlers.length - 1; i >= 0; i--) {
+            try {
+                errorHandlers[i](error);
+                handled = true;
+                break;
+            }
+            catch (e) {
+                error = e;
+            }
+        }
+        if (handled) {
+            return true;
+        }
+    }
+    return _handleError(node.parent, error);
+}
+function handleError(params) {
+    let { error } = params;
+    // Wrap error if it wasn't wrapped by wrapError (ie when not in dev mode)
+    if (!(error instanceof OwlError)) {
+        error = Object.assign(new OwlError(`An error occured in the owl lifecycle (see this Error's "cause" property)`), { cause: error });
+    }
+    const node = "node" in params ? params.node : params.fiber.node;
+    const fiber = "fiber" in params ? params.fiber : node.fiber;
+    if (fiber) {
+        // resets the fibers on components if possible. This is important so that
+        // new renderings can be properly included in the initial one, if any.
+        let current = fiber;
+        do {
+            current.node.fiber = current;
+            current = current.parent;
+        } while (current);
+        fibersInError.set(fiber.root, error);
+    }
+    const handled = _handleError(node, error);
+    if (!handled) {
+        console.warn(`[Owl] Unhandled error. Destroying the root component`);
+        try {
+            node.app.destroy();
+        }
+        catch (e) {
+            console.error(e);
+        }
+        throw error;
+    }
 }
 
 const { setAttribute: elemSetAttribute, removeAttribute } = Element.prototype;
@@ -710,7 +771,12 @@ function buildTree(node, parent = null, domParentTree = null) {
                 info.push({ type: "child", idx: index });
                 el = document.createTextNode("");
             }
-            currentNS || (currentNS = node.namespaceURI);
+            const attrs = node.attributes;
+            const ns = attrs.getNamedItem("block-ns");
+            if (ns) {
+                attrs.removeNamedItem("block-ns");
+                currentNS = ns.value;
+            }
             if (!el) {
                 el = currentNS
                     ? document.createElementNS(currentNS, tagName)
@@ -726,7 +792,6 @@ function buildTree(node, parent = null, domParentTree = null) {
                     const fragment = document.createElement("template").content;
                     fragment.appendChild(el);
                 }
-                const attrs = node.attributes;
                 for (let i = 0; i < attrs.length; i++) {
                     const attrName = attrs[i].name;
                     const attrValue = attrs[i].value;
@@ -1538,68 +1603,6 @@ function remove(vnode, withBeforeRemove = false) {
     vnode.remove();
 }
 
-// Maps fibers to thrown errors
-const fibersInError = new WeakMap();
-const nodeErrorHandlers = new WeakMap();
-function _handleError(node, error) {
-    if (!node) {
-        return false;
-    }
-    const fiber = node.fiber;
-    if (fiber) {
-        fibersInError.set(fiber, error);
-    }
-    const errorHandlers = nodeErrorHandlers.get(node);
-    if (errorHandlers) {
-        let handled = false;
-        // execute in the opposite order
-        for (let i = errorHandlers.length - 1; i >= 0; i--) {
-            try {
-                errorHandlers[i](error);
-                handled = true;
-                break;
-            }
-            catch (e) {
-                error = e;
-            }
-        }
-        if (handled) {
-            return true;
-        }
-    }
-    return _handleError(node.parent, error);
-}
-function handleError(params) {
-    let { error } = params;
-    // Wrap error if it wasn't wrapped by wrapError (ie when not in dev mode)
-    if (!(error instanceof OwlError)) {
-        error = Object.assign(new OwlError(`An error occured in the owl lifecycle (see this Error's "cause" property)`), { cause: error });
-    }
-    const node = "node" in params ? params.node : params.fiber.node;
-    const fiber = "fiber" in params ? params.fiber : node.fiber;
-    if (fiber) {
-        // resets the fibers on components if possible. This is important so that
-        // new renderings can be properly included in the initial one, if any.
-        let current = fiber;
-        do {
-            current.node.fiber = current;
-            current = current.parent;
-        } while (current);
-        fibersInError.set(fiber.root, error);
-    }
-    const handled = _handleError(node, error);
-    if (!handled) {
-        console.warn(`[Owl] Unhandled error. Destroying the root component`);
-        try {
-            node.app.destroy();
-        }
-        catch (e) {
-            console.error(e);
-        }
-        throw error;
-    }
-}
-
 function makeChildFiber(node, parent) {
     let current = node.fiber;
     if (current) {
@@ -1850,9 +1853,8 @@ const NO_CALLBACK = () => {
 };
 const objectToString = Object.prototype.toString;
 const objectHasOwnProperty = Object.prototype.hasOwnProperty;
-// Use arrays because Array.includes is faster than Set.has for small arrays
-const SUPPORTED_RAW_TYPES = ["Object", "Array", "Set", "Map", "WeakMap"];
-const COLLECTION_RAW_TYPES = ["Set", "Map", "WeakMap"];
+const SUPPORTED_RAW_TYPES = new Set(["Object", "Array", "Set", "Map", "WeakMap"]);
+const COLLECTION_RAWTYPES = new Set(["Set", "Map", "WeakMap"]);
 /**
  * extract "RawType" from strings like "[object RawType]" => this lets us ignore
  * many native objects such as Promise (whose toString is [object Promise])
@@ -1875,7 +1877,7 @@ function canBeMadeReactive(value) {
     if (typeof value !== "object") {
         return false;
     }
-    return SUPPORTED_RAW_TYPES.includes(rawType(value));
+    return SUPPORTED_RAW_TYPES.has(rawType(value));
 }
 /**
  * Creates a reactive from the given object/callback if possible and returns it,
@@ -2045,7 +2047,7 @@ function reactive(target, callback = NO_CALLBACK) {
     const reactivesForTarget = reactiveCache.get(target);
     if (!reactivesForTarget.has(callback)) {
         const targetRawType = rawType(target);
-        const handler = COLLECTION_RAW_TYPES.includes(targetRawType)
+        const handler = COLLECTION_RAWTYPES.has(targetRawType)
             ? collectionsProxyHandler(target, callback, targetRawType)
             : basicProxyHandler(callback);
         const proxy = new Proxy(target, handler);
@@ -2074,7 +2076,7 @@ function basicProxyHandler(callback) {
         set(target, key, value, receiver) {
             const hadKey = objectHasOwnProperty.call(target, key);
             const originalValue = Reflect.get(target, key, receiver);
-            const ret = Reflect.set(target, key, toRaw(value), receiver);
+            const ret = Reflect.set(target, key, value, receiver);
             if (!hadKey && objectHasOwnProperty.call(target, key)) {
                 notifyReactives(target, KEYCHANGES);
             }
@@ -2178,7 +2180,7 @@ function delegateAndNotify(setterName, getterName, target) {
         if (hadKey !== hasKey) {
             notifyReactives(target, KEYCHANGES);
         }
-        if (originalValue !== target[getterName](key)) {
+        if (originalValue !== value) {
             notifyReactives(target, key);
         }
         return ret;
@@ -2999,13 +3001,15 @@ function prepareList(collection) {
         keys = [...collection.keys()];
         values = [...collection.values()];
     }
-    else if (Symbol.iterator in Object(collection)) {
-        keys = [...collection];
-        values = keys;
-    }
     else if (collection && typeof collection === "object") {
-        values = Object.values(collection);
-        keys = Object.keys(collection);
+        if (Symbol.iterator in collection) {
+            keys = [...collection];
+            values = keys;
+        }
+        else {
+            values = Object.keys(collection);
+            keys = Object.values(collection);
+        }
     }
     else {
         throw new OwlError(`Invalid loop expression: "${collection}" is not iterable`);
@@ -3160,14 +3164,8 @@ const helpers = {
     makeRefWrapper,
 };
 
-/**
- * Parses an XML string into an XML document, throwing errors on parser errors
- * instead of returning an XML document containing the parseerror.
- *
- * @param xml the string to parse
- * @returns an XML document corresponding to the content of the string
- */
-function parseXML(xml) {
+const bdom = { text, createBlock, list, multi, html, toggler, comment };
+function parseXML$1(xml) {
     const parser = new DOMParser();
     const doc = parser.parseFromString(xml, "text/xml");
     if (doc.getElementsByTagName("parsererror").length) {
@@ -3194,9 +3192,7 @@ function parseXML(xml) {
         throw new OwlError(msg);
     }
     return doc;
-}
-
-const bdom = { text, createBlock, list, multi, html, toggler, comment };
+}
 class TemplateSet {
     constructor(config = {}) {
         this.rawTemplates = Object.create(globalTemplates);
@@ -3206,26 +3202,14 @@ class TemplateSet {
         this.translateFn = config.translateFn;
         this.translatableAttributes = config.translatableAttributes;
         if (config.templates) {
-            if (config.templates instanceof Document || typeof config.templates === "string") {
-                this.addTemplates(config.templates);
-            }
-            else {
-                for (const name in config.templates) {
-                    this.addTemplate(name, config.templates[name]);
-                }
-            }
+            this.addTemplates(config.templates);
         }
-        this.getRawTemplate = config.getTemplate;
     }
     static registerTemplate(name, fn) {
         globalTemplates[name] = fn;
     }
     addTemplate(name, template) {
         if (name in this.rawTemplates) {
-            // this check can be expensive, just silently ignore double definitions outside dev mode
-            if (!this.dev) {
-                return;
-            }
             const rawTemplate = this.rawTemplates[name];
             const currentAsString = typeof rawTemplate === "string"
                 ? rawTemplate
@@ -3245,16 +3229,15 @@ class TemplateSet {
             // empty string
             return;
         }
-        xml = xml instanceof Document ? xml : parseXML(xml);
+        xml = xml instanceof Document ? xml : parseXML$1(xml);
         for (const template of xml.querySelectorAll("[t-name]")) {
             const name = template.getAttribute("t-name");
             this.addTemplate(name, template);
         }
     }
     getTemplate(name) {
-        var _a;
         if (!(name in this.templates)) {
-            const rawTemplate = ((_a = this.getRawTemplate) === null || _a === void 0 ? void 0 : _a.call(this, name)) || this.rawTemplates[name];
+            const rawTemplate = this.rawTemplates[name];
             if (rawTemplate === undefined) {
                 let extraInfo = "";
                 try {
@@ -3870,7 +3853,7 @@ class CodeGenerator {
     createBlock(parentBlock, type, ctx) {
         const hasRoot = this.target.hasRoot;
         const block = new BlockDescription(this.target, type);
-        if (!hasRoot) {
+        if (!hasRoot && !ctx.preventRoot) {
             this.target.hasRoot = true;
             block.isRoot = true;
         }
@@ -3893,7 +3876,7 @@ class CodeGenerator {
         if (ctx.tKeyExpr) {
             blockExpr = `toggler(${ctx.tKeyExpr}, ${blockExpr})`;
         }
-        if (block.isRoot) {
+        if (block.isRoot && !ctx.preventRoot) {
             if (this.target.on) {
                 blockExpr = this.wrapWithEventCatcher(blockExpr, this.target.on);
             }
@@ -4069,6 +4052,11 @@ class CodeGenerator {
         }
         // attributes
         const attrs = {};
+        const nameSpace = ast.ns || ctx.nameSpace;
+        if (nameSpace && isNewBlock) {
+            // specific namespace uri
+            attrs["block-ns"] = nameSpace;
+        }
         for (let key in ast.attrs) {
             let expr, attrName;
             if (key.startsWith("t-attf")) {
@@ -4184,10 +4172,7 @@ class CodeGenerator {
             const idx = block.insertData(setRefStr, "ref");
             attrs["block-ref"] = String(idx);
         }
-        const nameSpace = ast.ns || ctx.nameSpace;
-        const dom = nameSpace
-            ? xmlDoc.createElementNS(nameSpace, ast.tag)
-            : xmlDoc.createElement(ast.tag);
+        const dom = xmlDoc.createElement(ast.tag);
         for (const [attr, val] of Object.entries(attrs)) {
             if (!(attr === "class" && val === "")) {
                 dom.setAttribute(attr, val);
@@ -4229,7 +4214,7 @@ class CodeGenerator {
                             break;
                     }
                 }
-                this.addLine(`let ${block.children.map((c) => c.varName).join(", ")};`, codeIdx);
+                this.addLine(`let ${block.children.map((c) => c.varName)};`, codeIdx);
             }
         }
         return block.varName;
@@ -4332,7 +4317,7 @@ class CodeGenerator {
                             break;
                     }
                 }
-                this.addLine(`let ${block.children.map((c) => c.varName).join(", ")};`, codeIdx);
+                this.addLine(`let ${block.children.map((c) => c.varName)};`, codeIdx);
             }
             // note: this part is duplicated from end of compilemulti:
             const args = block.children.map((c) => c.varName).join(", ");
@@ -4361,18 +4346,18 @@ class CodeGenerator {
         }
         this.addLine(`for (let ${loopVar} = 0; ${loopVar} < ${l}; ${loopVar}++) {`);
         this.target.indentLevel++;
-        this.addLine(`ctx[\`${ast.elem}\`] = ${keys}[${loopVar}];`);
+        this.addLine(`ctx[\`${ast.elem}\`] = ${vals}[${loopVar}];`);
         if (!ast.hasNoFirst) {
             this.addLine(`ctx[\`${ast.elem}_first\`] = ${loopVar} === 0;`);
         }
         if (!ast.hasNoLast) {
-            this.addLine(`ctx[\`${ast.elem}_last\`] = ${loopVar} === ${keys}.length - 1;`);
+            this.addLine(`ctx[\`${ast.elem}_last\`] = ${loopVar} === ${vals}.length - 1;`);
         }
         if (!ast.hasNoIndex) {
             this.addLine(`ctx[\`${ast.elem}_index\`] = ${loopVar};`);
         }
         if (!ast.hasNoValue) {
-            this.addLine(`ctx[\`${ast.elem}_value\`] = ${vals}[${loopVar}];`);
+            this.addLine(`ctx[\`${ast.elem}_value\`] = ${keys}[${loopVar}];`);
         }
         this.define(`key${this.target.loopLevel}`, ast.key ? compileExpr(ast.key) : loopVar);
         if (this.dev) {
@@ -4447,6 +4432,7 @@ class CodeGenerator {
                 block,
                 index,
                 forceNewBlock: !isTSet,
+                preventRoot: ctx.preventRoot,
                 isLast: ctx.isLast && i === l - 1,
             });
             this.compileAST(child, subCtx);
@@ -4455,19 +4441,21 @@ class CodeGenerator {
             }
         }
         if (isNewBlock) {
-            if (block.hasDynamicChildren && block.children.length) {
-                const code = this.target.code;
-                const children = block.children.slice();
-                let current = children.shift();
-                for (let i = codeIdx; i < code.length; i++) {
-                    if (code[i].trimStart().startsWith(`const ${current.varName} `)) {
-                        code[i] = code[i].replace(`const ${current.varName}`, current.varName);
-                        current = children.shift();
-                        if (!current)
-                            break;
+            if (block.hasDynamicChildren) {
+                if (block.children.length) {
+                    const code = this.target.code;
+                    const children = block.children.slice();
+                    let current = children.shift();
+                    for (let i = codeIdx; i < code.length; i++) {
+                        if (code[i].trimStart().startsWith(`const ${current.varName} `)) {
+                            code[i] = code[i].replace(`const ${current.varName}`, current.varName);
+                            current = children.shift();
+                            if (!current)
+                                break;
+                        }
                     }
+                    this.addLine(`let ${block.children.map((c) => c.varName)};`, codeIdx);
                 }
-                this.addLine(`let ${block.children.map((c) => c.varName).join(", ")};`, codeIdx);
             }
             const args = block.children.map((c) => c.varName).join(", ");
             this.insertBlock(`multi([${args}])`, block, ctx);
@@ -4481,23 +4469,24 @@ class CodeGenerator {
             ctxVar = generateId("ctx");
             this.addLine(`let ${ctxVar} = ${compileExpr(ast.context)};`);
         }
-        const isDynamic = INTERP_REGEXP.test(ast.name);
-        const subTemplate = isDynamic ? interpolate(ast.name) : "`" + ast.name + "`";
-        if (block && !forceNewBlock) {
-            this.insertAnchor(block);
-        }
-        block = this.createBlock(block, "multi", ctx);
         if (ast.body) {
             this.addLine(`${ctxVar} = Object.create(${ctxVar});`);
             this.addLine(`${ctxVar}[isBoundary] = 1;`);
             this.helpers.add("isBoundary");
-            const subCtx = createContext(ctx, { ctxVar });
+            const subCtx = createContext(ctx, { preventRoot: true, ctxVar });
             const bl = this.compileMulti({ type: 3 /* Multi */, content: ast.body }, subCtx);
             if (bl) {
                 this.helpers.add("zero");
                 this.addLine(`${ctxVar}[zero] = ${bl};`);
             }
         }
+        const isDynamic = INTERP_REGEXP.test(ast.name);
+        const subTemplate = isDynamic ? interpolate(ast.name) : "`" + ast.name + "`";
+        if (block) {
+            if (!forceNewBlock) {
+                this.insertAnchor(block);
+            }
+        }
         const key = `key + \`${this.generateComponentKey()}\``;
         if (isDynamic) {
             const templateVar = generateId("template");
@@ -4505,6 +4494,7 @@ class CodeGenerator {
                 this.staticDefs.push({ id: "call", expr: `app.callTemplate.bind(app)` });
             }
             this.define(templateVar, subTemplate);
+            block = this.createBlock(block, "multi", ctx);
             this.insertBlock(`call(this, ${templateVar}, ${ctxVar}, node, ${key})`, block, {
                 ...ctx,
                 forceNewBlock: !block,
@@ -4513,6 +4503,7 @@ class CodeGenerator {
         else {
             const id = generateId(`callTemplate_`);
             this.staticDefs.push({ id, expr: `app.getTemplate(${subTemplate})` });
+            block = this.createBlock(block, "multi", ctx);
             this.insertBlock(`${id}.call(this, ${ctxVar}, node, ${key})`, block, {
                 ...ctx,
                 forceNewBlock: !block,
@@ -4834,7 +4825,7 @@ function parse(xml) {
 }
 function _parse(xml) {
     normalizeXML(xml);
-    const ctx = { inPreTag: false };
+    const ctx = { inPreTag: false, inSVG: false };
     return parseNode(xml, ctx) || { type: 0 /* Text */, value: "" };
 }
 function parseNode(node, ctx) {
@@ -4925,7 +4916,9 @@ function parseDOMNode(node, ctx) {
     if (tagName === "pre") {
         ctx.inPreTag = true;
     }
-    let ns = !ctx.nameSpace && ROOT_SVG_TAGS.has(tagName) ? "http://www.w3.org/2000/svg" : null;
+    const shouldAddSVGNS = ROOT_SVG_TAGS.has(tagName) && !ctx.inSVG;
+    ctx.inSVG = ctx.inSVG || shouldAddSVGNS;
+    const ns = shouldAddSVGNS ? "http://www.w3.org/2000/svg" : null;
     const ref = node.getAttribute("t-ref");
     node.removeAttribute("t-ref");
     const nodeAttrsNames = node.getAttributeNames();
@@ -4964,9 +4957,9 @@ function parseDOMNode(node, ctx) {
             const isSelect = tagName === "select";
             const isCheckboxInput = isInput && typeAttr === "checkbox";
             const isRadioInput = isInput && typeAttr === "radio";
-            const hasTrimMod = attr.includes(".trim");
-            const hasLazyMod = hasTrimMod || attr.includes(".lazy");
+            const hasLazyMod = attr.includes(".lazy");
             const hasNumberMod = attr.includes(".number");
+            const hasTrimMod = attr.includes(".trim");
             const eventType = isRadioInput ? "click" : isSelect || hasLazyMod ? "change" : "input";
             model = {
                 baseExpr,
@@ -4987,9 +4980,6 @@ function parseDOMNode(node, ctx) {
         else if (attr.startsWith("block-")) {
             throw new OwlError(`Invalid attribute: '${attr}'`);
         }
-        else if (attr === "xmlns") {
-            ns = value;
-        }
         else if (attr !== "t-name") {
             if (attr.startsWith("t-") && !attr.startsWith("t-att")) {
                 throw new OwlError(`Unknown QWeb directive: '${attr}'`);
@@ -5002,9 +4992,6 @@ function parseDOMNode(node, ctx) {
             attrs[attr] = value;
         }
     }
-    if (ns) {
-        ctx.nameSpace = ns;
-    }
     const children = parseChildren(node, ctx);
     return {
         type: 2 /* DomNode */,
@@ -5297,14 +5284,14 @@ function parseComponent(node, ctx) {
             // be ignored)
             let el = slotNode.parentElement;
             let isInSubComponent = false;
-            while (el && el !== clone) {
+            while (el !== clone) {
                 if (el.hasAttribute("t-component") || el.tagName[0] === el.tagName[0].toUpperCase()) {
                     isInSubComponent = true;
                     break;
                 }
                 el = el.parentElement;
             }
-            if (isInSubComponent || !el) {
+            if (isInSubComponent) {
                 continue;
             }
             slotNode.removeAttribute("t-set-slot");
@@ -5512,6 +5499,41 @@ function normalizeTEscTOut(el) {
 function normalizeXML(el) {
     normalizeTIf(el);
     normalizeTEscTOut(el);
+}
+/**
+ * Parses an XML string into an XML document, throwing errors on parser errors
+ * instead of returning an XML document containing the parseerror.
+ *
+ * @param xml the string to parse
+ * @returns an XML document corresponding to the content of the string
+ */
+function parseXML(xml) {
+    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 OwlError(msg);
+    }
+    return doc;
 }
 
 function compile(template, options = {}) {
@@ -5525,20 +5547,11 @@ function compile(template, options = {}) {
     const codeGenerator = new CodeGenerator(ast, { ...options, hasSafeContext });
     const code = codeGenerator.generateCode();
     // template function
-    try {
-        return new Function("app, bdom, helpers", code);
-    }
-    catch (originalError) {
-        const { name } = options;
-        const nameStr = name ? `template "${name}"` : "anonymous template";
-        const err = new OwlError(`Failed to compile ${nameStr}: ${originalError.message}\n\ngenerated code:\nfunction(app, bdom, helpers) {\n${code}\n}`);
-        err.cause = originalError;
-        throw err;
-    }
+    return new Function("app, bdom, helpers", code);
 }
 
 // do not modify manually. This file is generated by the release script.
-const version = "2.2.9";
+const version = "2.2.3";
 
 // -----------------------------------------------------------------------------
 //  Scheduler
@@ -5627,8 +5640,13 @@ const DEV_MSG = () => {
 This is not suitable for production use.
 See https://github.com/odoo/owl/blob/${hash}/doc/reference/app.md#configuration for more information.`;
 };
-const apps = new Set();
-window.__OWL_DEVTOOLS__ || (window.__OWL_DEVTOOLS__ = { apps, Fiber, RootFiber, toRaw, reactive });
+window.__OWL_DEVTOOLS__ || (window.__OWL_DEVTOOLS__ = {
+    apps: new Set(),
+    Fiber: Fiber,
+    RootFiber: RootFiber,
+    toRaw: toRaw,
+    reactive: reactive,
+});
 class App extends TemplateSet {
     constructor(Root, config = {}) {
         super(config);
@@ -5636,7 +5654,7 @@ class App extends TemplateSet {
         this.root = null;
         this.name = config.name || "";
         this.Root = Root;
-        apps.add(this);
+        window.__OWL_DEVTOOLS__.apps.add(this);
         if (config.test) {
             this.dev = true;
         }
@@ -5693,7 +5711,7 @@ class App extends TemplateSet {
             this.root.destroy();
             this.scheduler.processTasks();
         }
-        apps.delete(this);
+        window.__OWL_DEVTOOLS__.apps.delete(this);
     }
     createComponent(name, isStatic, hasSlotsProp, hasDynamicPropList, propList) {
         const isDynamic = !isStatic;
@@ -5768,7 +5786,6 @@ class App extends TemplateSet {
     }
 }
 App.validateTarget = validateTarget;
-App.apps = apps;
 App.version = version;
 async function mount(C, target, config = {}) {
     return new App(C, config).mount(target, config);
@@ -5885,7 +5902,7 @@ function useChildSubEnv(envExtension) {
  *
  * @template T
  * @param {Effect<T>} effect the effect to run on component mount and/or patch
- * @param {()=>[...T]} [computeDependencies=()=>[NaN]] a callback to compute
+ * @param {()=>T} [computeDependencies=()=>[NaN]] a callback to compute
  *      dependencies that will decide if the effect needs to be cleaned up and
  *      run again. If the dependencies did not change, the effect will not run
  *      again. The default value returns an array containing only NaN because
@@ -5967,6 +5984,6 @@ TemplateSet.prototype._compileTemplate = function _compileTemplate(name, templat
 export { App, Component, EventBus, OwlError, __info__, blockDom, loadFile, markRaw, markup, mount, onError, onMounted, onPatched, onRendered, onWillDestroy, onWillPatch, onWillRender, onWillStart, onWillUnmount, onWillUpdateProps, reactive, status, toRaw, useChildSubEnv, useComponent, useEffect, useEnv, useExternalListener, useRef, useState, useSubEnv, validate, validateType, whenReady, xml };
 
 
-__info__.date = '2024-01-12T14:43:56.804Z';
-__info__.hash = '7b3e39b';
+__info__.date = '2023-07-20T06:05:29.796Z';
+__info__.hash = 'b1a3b32';
 __info__.url = 'https://github.com/odoo/owl';

docs/playground/samples/todo_app/todo_app.js

@@ -43,6 +43,10 @@ class TaskList {
         }
     }
 
+    toggleTask(task) {
+        task.isCompleted = !task.isCompleted;
+    }
+
     toggleTask(id) {
         const task = this.tasks.find(t => t.id === id);
         task.isCompleted = !task.isCompleted;
@@ -57,7 +61,7 @@ class TaskList {
     clearCompleted() {
         const tasks = this.tasks.filter(t => t.isCompleted);
         for (let task of tasks) {
-            this.deleteTask(task.id);
+            this.deleteTask(task);
         }
     }
     

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@odoo/owl",
-  "version": "2.2.9",
+  "version": "2.2.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@odoo/owl",
-  "version": "2.2.9",
+  "version": "2.2.3",
   "description": "Odoo Web Library (OWL)",
   "main": "dist/owl.cjs.js",
   "module": "dist/owl.es.js",

src/common/owl_error.ts

@@ -1,4 +0,0 @@
-// Custom error class that wraps error that happen in the owl lifecycle
-export class OwlError extends Error {
-  cause?: any;
-}

src/common/utils.ts

@@ -1,38 +0,0 @@
-import { OwlError } from "./owl_error";
-
-/**
- * Parses an XML string into an XML document, throwing errors on parser errors
- * instead of returning an XML document containing the parseerror.
- *
- * @param xml the string to parse
- * @returns an XML document corresponding to the content of the string
- */
-export function parseXML(xml: string): XMLDocument {
-  const parser = new DOMParser();
-  const doc = parser.parseFromString(xml, "text/xml");
-  if (doc.getElementsByTagName("parsererror").length) {
-    let msg = "Invalid XML in template.";
-    const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
-    if (parsererrorText) {
-      msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
-      const re = /\d+/g;
-      const firstMatch = re.exec(parsererrorText);
-      if (firstMatch) {
-        const lineNumber = Number(firstMatch[0]);
-        const line = xml.split("\n")[lineNumber - 1];
-        const secondMatch = re.exec(parsererrorText);
-        if (line && secondMatch) {
-          const columnIndex = Number(secondMatch[0]) - 1;
-          if (line[columnIndex]) {
-            msg +=
-              `\nThe error might be located at xml line ${lineNumber} column ${columnIndex}\n` +
-              `${line}\n${"-".repeat(columnIndex - 1)}^`;
-          }
-        }
-      }
-    }
-    throw new OwlError(msg);
-  }
-
-  return doc;
-}

src/compiler/code_generator.ts

@@ -18,6 +18,7 @@ import {
   ASTTCallBlock,
   ASTTEsc,
   ASTText,
+  ASTTFor,
   ASTTForEach,
   ASTTif,
   ASTTKey,
@@ -29,7 +30,7 @@ import {
   Attrs,
   EventHandlers,
 } from "./parser";
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "../runtime/error_handling";
 
 type BlockType = "block" | "text" | "multi" | "list" | "html" | "comment";
 const whitespaceRE = /\s+/g;
@@ -160,6 +161,7 @@ interface Context {
   block: BlockDescription | null;
   index: number | string;
   forceNewBlock: boolean;
+  preventRoot?: boolean;
   isLast?: boolean;
   translate: boolean;
   tKeyExpr: string | null;
@@ -376,7 +378,7 @@ export class CodeGenerator {
   ): BlockDescription {
     const hasRoot = this.target.hasRoot;
     const block = new BlockDescription(this.target, type);
-    if (!hasRoot) {
+    if (!hasRoot && !ctx.preventRoot) {
       this.target.hasRoot = true;
       block.isRoot = true;
     }
@@ -402,7 +404,7 @@ export class CodeGenerator {
       blockExpr = `toggler(${ctx.tKeyExpr}, ${blockExpr})`;
     }
 
-    if (block.isRoot) {
+    if (block.isRoot && !ctx.preventRoot) {
       if (this.target.on) {
         blockExpr = this.wrapWithEventCatcher(blockExpr, this.target.on);
       }
@@ -470,6 +472,8 @@ export class CodeGenerator {
         return this.compileTIf(ast, ctx);
       case ASTType.TForEach:
         return this.compileTForeach(ast, ctx);
+      case ASTType.TFor:
+        return this.compileTFor(ast, ctx);
       case ASTType.TKey:
         return this.compileTKey(ast, ctx);
       case ASTType.Multi:
@@ -585,6 +589,11 @@ export class CodeGenerator {
     }
     // attributes
     const attrs: Attrs = {};
+    const nameSpace = ast.ns || ctx.nameSpace;
+    if (nameSpace && isNewBlock) {
+      // specific namespace uri
+      attrs["block-ns"] = nameSpace;
+    }
 
     for (let key in ast.attrs) {
       let expr, attrName;
@@ -713,10 +722,7 @@ export class CodeGenerator {
       attrs["block-ref"] = String(idx);
     }
 
-    const nameSpace = ast.ns || ctx.nameSpace;
-    const dom = nameSpace
-      ? xmlDoc.createElementNS(nameSpace, ast.tag)
-      : xmlDoc.createElement(ast.tag);
+    const dom = xmlDoc.createElement(ast.tag);
     for (const [attr, val] of Object.entries(attrs)) {
       if (!(attr === "class" && val === "")) {
         dom.setAttribute(attr, val);
@@ -758,7 +764,7 @@ export class CodeGenerator {
             if (!current) break;
           }
         }
-        this.addLine(`let ${block!.children.map((c) => c.varName).join(", ")};`, codeIdx);
+        this.addLine(`let ${block!.children.map((c) => c.varName)};`, codeIdx);
       }
     }
     return block!.varName;
@@ -860,7 +866,7 @@ export class CodeGenerator {
             if (!current) break;
           }
         }
-        this.addLine(`let ${block!.children.map((c) => c.varName).join(", ")};`, codeIdx);
+        this.addLine(`let ${block!.children.map((c) => c.varName)};`, codeIdx);
       }
 
       // note: this part is duplicated from end of compilemulti:
@@ -891,20 +897,20 @@ export class CodeGenerator {
     }
     this.addLine(`for (let ${loopVar} = 0; ${loopVar} < ${l}; ${loopVar}++) {`);
     this.target.indentLevel++;
-    this.addLine(`ctx[\`${ast.elem}\`] = ${keys}[${loopVar}];`);
+    this.addLine(`ctx[\`${ast.elem}\`] = ${vals}[${loopVar}];`);
     if (!ast.hasNoFirst) {
       this.addLine(`ctx[\`${ast.elem}_first\`] = ${loopVar} === 0;`);
     }
     if (!ast.hasNoLast) {
-      this.addLine(`ctx[\`${ast.elem}_last\`] = ${loopVar} === ${keys}.length - 1;`);
+      this.addLine(`ctx[\`${ast.elem}_last\`] = ${loopVar} === ${vals}.length - 1;`);
     }
     if (!ast.hasNoIndex) {
       this.addLine(`ctx[\`${ast.elem}_index\`] = ${loopVar};`);
     }
     if (!ast.hasNoValue) {
-      this.addLine(`ctx[\`${ast.elem}_value\`] = ${vals}[${loopVar}];`);
+      this.addLine(`ctx[\`${ast.elem}_value\`] = ${keys}[${loopVar}];`);
     }
-    this.define(`key${this.target.loopLevel}`, ast.key ? compileExpr(ast.key) : loopVar);
+    this.define(`key${this.target.loopLevel}`, compileExpr(ast.key));
     if (this.dev) {
       // Throw error on duplicate keys in dev mode
       this.helpers.add("OwlError");
@@ -951,6 +957,46 @@ export class CodeGenerator {
     return block.varName;
   }
 
+  compileTFor(ast: ASTTFor, ctx: Context): string {
+    let { block } = ctx;
+    if (block) {
+      this.insertAnchor(block);
+    }
+    block = this.createBlock(block, "list", ctx);
+    this.target.loopLevel++;
+    this.addLine(`ctx = Object.create(ctx);`);
+    // Throw errors on duplicate keys in dev mode
+    if (this.dev) {
+      this.define(`keys${block.id}`, `new Set()`);
+    }
+    this.define(`c_block${block.id}`, "[]");
+    const index = `i${this.target.loopLevel}`;
+    this.addLine(`let ${index} = ${0};`);
+    const binding = compileExpr(ast.binding);
+    this.addLine(`for (${binding} of ${compileExpr(ast.iterable)}) {`);
+    this.target.indentLevel++;
+    this.define(`key${this.target.loopLevel}`, compileExpr(ast.key));
+    if (this.dev) {
+      // Throw error on duplicate keys in dev mode
+      this.helpers.add("OwlError");
+      this.addLine(
+        `if (keys${block.id}.has(String(key${this.target.loopLevel}))) { throw new OwlError(\`Got duplicate key in t-for: \${key${this.target.loopLevel}}\`)}`
+      );
+      this.addLine(`keys${block.id}.add(String(key${this.target.loopLevel}));`);
+    }
+    const subCtx = createContext(ctx, { block, index });
+    this.compileAST(ast.body, subCtx);
+    this.addLine(`${index}++;`);
+    this.target.indentLevel--;
+    this.target.loopLevel--;
+    this.addLine(`}`);
+    if (!ctx.isLast) {
+      this.addLine(`ctx = ctx.__proto__;`);
+    }
+    this.insertBlock("l", block, ctx);
+    return block.varName;
+  }
+
   compileTKey(ast: ASTTKey, ctx: Context): string | null {
     const tKeyExpr = generateId("tKey_");
     this.define(tKeyExpr, compileExpr(ast.expr));
@@ -986,6 +1032,7 @@ export class CodeGenerator {
         block,
         index,
         forceNewBlock: !isTSet,
+        preventRoot: ctx.preventRoot,
         isLast: ctx.isLast && i === l - 1,
       });
       this.compileAST(child, subCtx);
@@ -994,18 +1041,20 @@ export class CodeGenerator {
       }
     }
     if (isNewBlock) {
-      if (block!.hasDynamicChildren && block!.children.length) {
-        const code = this.target.code;
-        const children = block!.children.slice();
-        let current = children.shift();
-        for (let i = codeIdx; i < code.length; i++) {
-          if (code[i].trimStart().startsWith(`const ${current!.varName} `)) {
-            code[i] = code[i].replace(`const ${current!.varName}`, current!.varName);
-            current = children.shift();
-            if (!current) break;
+      if (block!.hasDynamicChildren) {
+        if (block!.children.length) {
+          const code = this.target.code;
+          const children = block!.children.slice();
+          let current = children.shift();
+          for (let i = codeIdx; i < code.length; i++) {
+            if (code[i].trimStart().startsWith(`const ${current!.varName} `)) {
+              code[i] = code[i].replace(`const ${current!.varName}`, current!.varName);
+              current = children.shift();
+              if (!current) break;
+            }
           }
+          this.addLine(`let ${block!.children.map((c) => c.varName)};`, codeIdx);
         }
-        this.addLine(`let ${block!.children.map((c) => c.varName).join(", ")};`, codeIdx);
       }
 
       const args = block!.children.map((c) => c.varName).join(", ");
@@ -1021,24 +1070,24 @@ export class CodeGenerator {
       ctxVar = generateId("ctx");
       this.addLine(`let ${ctxVar} = ${compileExpr(ast.context)};`);
     }
-    const isDynamic = INTERP_REGEXP.test(ast.name);
-    const subTemplate = isDynamic ? interpolate(ast.name) : "`" + ast.name + "`";
-    if (block && !forceNewBlock) {
-      this.insertAnchor(block);
-    }
-    block = this.createBlock(block, "multi", ctx);
     if (ast.body) {
       this.addLine(`${ctxVar} = Object.create(${ctxVar});`);
       this.addLine(`${ctxVar}[isBoundary] = 1;`);
       this.helpers.add("isBoundary");
-      const subCtx = createContext(ctx, { ctxVar });
+      const subCtx = createContext(ctx, { preventRoot: true, ctxVar });
       const bl = this.compileMulti({ type: ASTType.Multi, content: ast.body }, subCtx);
       if (bl) {
         this.helpers.add("zero");
         this.addLine(`${ctxVar}[zero] = ${bl};`);
       }
     }
-
+    const isDynamic = INTERP_REGEXP.test(ast.name);
+    const subTemplate = isDynamic ? interpolate(ast.name) : "`" + ast.name + "`";
+    if (block) {
+      if (!forceNewBlock) {
+        this.insertAnchor(block);
+      }
+    }
     const key = `key + \`${this.generateComponentKey()}\``;
     if (isDynamic) {
       const templateVar = generateId("template");
@@ -1046,6 +1095,7 @@ export class CodeGenerator {
         this.staticDefs.push({ id: "call", expr: `app.callTemplate.bind(app)` });
       }
       this.define(templateVar, subTemplate);
+      block = this.createBlock(block, "multi", ctx);
       this.insertBlock(`call(this, ${templateVar}, ${ctxVar}, node, ${key})`, block!, {
         ...ctx,
         forceNewBlock: !block,
@@ -1053,6 +1103,7 @@ export class CodeGenerator {
     } else {
       const id = generateId(`callTemplate_`);
       this.staticDefs.push({ id, expr: `app.getTemplate(${subTemplate})` });
+      block = this.createBlock(block, "multi", ctx);
       this.insertBlock(`${id}.call(this, ${ctxVar}, node, ${key})`, block!, {
         ...ctx,
         forceNewBlock: !block,

src/compiler/index.ts

@@ -2,7 +2,7 @@ import type { TemplateSet } from "../runtime/template_set";
 import type { BDom } from "../runtime/blockdom";
 import { CodeGenerator, Config } from "./code_generator";
 import { parse } from "./parser";
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "../runtime";
 
 export type Template = (context: any, vnode: any, key?: string) => BDom;
 

src/compiler/inline_expressions.ts

@@ -1,4 +1,4 @@
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "../runtime/error_handling";
 
 /**
  * Owl QWeb Expression Parser

src/compiler/parser.ts

@@ -1,5 +1,4 @@
-import { OwlError } from "../common/owl_error";
-import { parseXML } from "../common/utils";
+import { OwlError } from "../runtime/error_handling";
 
 // -----------------------------------------------------------------------------
 // AST Type definition
@@ -27,6 +26,7 @@ export const enum ASTType {
   TCallBlock,
   TTranslation,
   TPortal,
+  TFor,
 }
 
 export interface ASTText {
@@ -105,7 +105,15 @@ export interface ASTTForEach {
   hasNoLast: boolean;
   hasNoIndex: boolean;
   hasNoValue: boolean;
-  key: string | null;
+  key: string;
+}
+
+export interface ASTTFor {
+  type: ASTType.TFor;
+  iterable: string;
+  binding: string;
+  body: AST;
+  key: string;
 }
 
 export interface ASTTKey {
@@ -184,6 +192,7 @@ export type AST =
   | ASTTCall
   | ASTTOut
   | ASTTForEach
+  | ASTTFor
   | ASTTKey
   | ASTComponent
   | ASTSlot
@@ -214,14 +223,14 @@ export function parse(xml: string | Element): AST {
 
 function _parse(xml: Element): AST {
   normalizeXML(xml);
-  const ctx = { inPreTag: false };
+  const ctx = { inPreTag: false, inSVG: false };
   return parseNode(xml, ctx) || { type: ASTType.Text, value: "" };
 }
 
 interface ParsingContext {
   tModelInfo?: TModelInfo | null;
-  nameSpace?: string;
   inPreTag: boolean;
+  inSVG: boolean;
 }
 
 function parseNode(node: Node, ctx: ParsingContext): AST | null {
@@ -231,6 +240,7 @@ function parseNode(node: Node, ctx: ParsingContext): AST | null {
   return (
     parseTDebugLog(node, ctx) ||
     parseTForEach(node, ctx) ||
+    parseTFor(node, ctx) ||
     parseTIf(node, ctx) ||
     parseTPortal(node, ctx) ||
     parseTCall(node, ctx) ||
@@ -324,8 +334,9 @@ function parseDOMNode(node: Element, ctx: ParsingContext): AST | null {
   if (tagName === "pre") {
     ctx.inPreTag = true;
   }
-
-  let ns = !ctx.nameSpace && ROOT_SVG_TAGS.has(tagName) ? "http://www.w3.org/2000/svg" : null;
+  const shouldAddSVGNS = ROOT_SVG_TAGS.has(tagName) && !ctx.inSVG;
+  ctx.inSVG = ctx.inSVG || shouldAddSVGNS;
+  const ns = shouldAddSVGNS ? "http://www.w3.org/2000/svg" : null;
   const ref = node.getAttribute("t-ref");
   node.removeAttribute("t-ref");
 
@@ -367,9 +378,9 @@ function parseDOMNode(node: Element, ctx: ParsingContext): AST | null {
       const isSelect = tagName === "select";
       const isCheckboxInput = isInput && typeAttr === "checkbox";
       const isRadioInput = isInput && typeAttr === "radio";
-      const hasTrimMod = attr.includes(".trim");
-      const hasLazyMod = hasTrimMod || attr.includes(".lazy");
+      const hasLazyMod = attr.includes(".lazy");
       const hasNumberMod = attr.includes(".number");
+      const hasTrimMod = attr.includes(".trim");
       const eventType = isRadioInput ? "click" : isSelect || hasLazyMod ? "change" : "input";
 
       model = {
@@ -389,8 +400,6 @@ function parseDOMNode(node: Element, ctx: ParsingContext): AST | null {
       }
     } else if (attr.startsWith("block-")) {
       throw new OwlError(`Invalid attribute: '${attr}'`);
-    } else if (attr === "xmlns") {
-      ns = value;
     } else if (attr !== "t-name") {
       if (attr.startsWith("t-") && !attr.startsWith("t-att")) {
         throw new OwlError(`Unknown QWeb directive: '${attr}'`);
@@ -403,9 +412,6 @@ function parseDOMNode(node: Element, ctx: ParsingContext): AST | null {
       attrs[attr] = value;
     }
   }
-  if (ns) {
-    ctx.nameSpace = ns;
-  }
 
   const children = parseChildren(node, ctx);
   return {
@@ -536,6 +542,36 @@ function parseTForEach(node: Element, ctx: ParsingContext): AST | null {
   };
 }
 
+function parseTFor(node: Element, ctx: ParsingContext): AST | null {
+  if (!node.hasAttribute("t-for")) {
+    return null;
+  }
+  const binding = node.getAttribute("t-for")!;
+  node.removeAttribute("t-for");
+  const iterable = node.getAttribute("t-of") || "";
+  node.removeAttribute("t-of");
+  const key = node.getAttribute("t-key");
+  if (!key) {
+    throw new OwlError(
+      `"Directive t-for should always be used with a t-key!" (expression: t-for="${binding}" t-of="${iterable}")`
+    );
+  }
+  node.removeAttribute("t-key");
+  const body = parseNode(node, ctx);
+
+  if (!body) {
+    return null;
+  }
+
+  return {
+    type: ASTType.TFor,
+    iterable,
+    binding,
+    body,
+    key,
+  };
+}
+
 function parseTKey(node: Element, ctx: ParsingContext): AST | null {
   if (!node.hasAttribute("t-key")) {
     return null;
@@ -741,14 +777,14 @@ function parseComponent(node: Element, ctx: ParsingContext): AST | null {
       // be ignored)
       let el = slotNode.parentElement!;
       let isInSubComponent = false;
-      while (el && el !== clone) {
+      while (el !== clone) {
         if (el!.hasAttribute("t-component") || el!.tagName[0] === el!.tagName[0].toUpperCase()) {
           isInSubComponent = true;
           break;
         }
         el = el.parentElement!;
       }
-      if (isInSubComponent || !el) {
+      if (isInSubComponent) {
         continue;
       }
 
@@ -973,3 +1009,40 @@ function normalizeXML(el: Element) {
   normalizeTIf(el);
   normalizeTEscTOut(el);
 }
+
+/**
+ * Parses an XML string into an XML document, throwing errors on parser errors
+ * instead of returning an XML document containing the parseerror.
+ *
+ * @param xml the string to parse
+ * @returns an XML document corresponding to the content of the string
+ */
+function parseXML(xml: string): XMLDocument {
+  const parser = new DOMParser();
+  const doc = parser.parseFromString(xml, "text/xml");
+  if (doc.getElementsByTagName("parsererror").length) {
+    let msg = "Invalid XML in template.";
+    const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
+    if (parsererrorText) {
+      msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
+      const re = /\d+/g;
+      const firstMatch = re.exec(parsererrorText);
+      if (firstMatch) {
+        const lineNumber = Number(firstMatch[0]);
+        const line = xml.split("\n")[lineNumber - 1];
+        const secondMatch = re.exec(parsererrorText);
+        if (line && secondMatch) {
+          const columnIndex = Number(secondMatch[0]) - 1;
+          if (line[columnIndex]) {
+            msg +=
+              `\nThe error might be located at xml line ${lineNumber} column ${columnIndex}\n` +
+              `${line}\n${"-".repeat(columnIndex - 1)}^`;
+          }
+        }
+      }
+    }
+    throw new OwlError(msg);
+  }
+
+  return doc;
+}

src/runtime/app.ts

@@ -1,8 +1,7 @@
 import { version } from "../version";
 import { Component, ComponentConstructor, Props } from "./component";
 import { ComponentNode } from "./component_node";
-import { nodeErrorHandlers, handleError } from "./error_handling";
-import { OwlError } from "../common/owl_error";
+import { nodeErrorHandlers, OwlError, handleError } from "./error_handling";
 import { Fiber, RootFiber, MountOptions } from "./fibers";
 import { Scheduler } from "./scheduler";
 import { validateProps } from "./template_helpers";
@@ -35,8 +34,6 @@ This is not suitable for production use.
 See https://github.com/odoo/owl/blob/${hash}/doc/reference/app.md#configuration for more information.`;
 };
 
-const apps = new Set<App>();
-
 declare global {
   interface Window {
     __OWL_DEVTOOLS__: {
@@ -49,7 +46,13 @@ declare global {
   }
 }
 
-window.__OWL_DEVTOOLS__ ||= { apps, Fiber, RootFiber, toRaw, reactive };
+window.__OWL_DEVTOOLS__ ||= {
+  apps: new Set<App>(),
+  Fiber: Fiber,
+  RootFiber: RootFiber,
+  toRaw: toRaw,
+  reactive: reactive,
+};
 
 export class App<
   T extends abstract new (...args: any) => any = any,
@@ -57,7 +60,6 @@ export class App<
   E = any
 > extends TemplateSet {
   static validateTarget = validateTarget;
-  static apps = apps;
   static version = version;
 
   name: string;
@@ -72,7 +74,7 @@ export class App<
     super(config);
     this.name = config.name || "";
     this.Root = Root;
-    apps.add(this);
+    window.__OWL_DEVTOOLS__.apps.add(this);
     if (config.test) {
       this.dev = true;
     }
@@ -137,7 +139,7 @@ export class App<
       this.root.destroy();
       this.scheduler.processTasks();
     }
-    apps.delete(this);
+    window.__OWL_DEVTOOLS__.apps.delete(this);
   }
 
   createComponent<P extends Props>(

src/runtime/blockdom/block_compiler.ts

@@ -1,4 +1,4 @@
-import { OwlError } from "../../common/owl_error";
+import { OwlError } from "../error_handling";
 import { attrsSetter, attrsUpdater, createAttrUpdater, setClass, updateClass } from "./attributes";
 import { config } from "./config";
 import { createEventHandler } from "./events";
@@ -144,7 +144,12 @@ function buildTree(
         info.push({ type: "child", idx: index });
         el = document.createTextNode("");
       }
-      currentNS ||= (node as Element).namespaceURI;
+      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)
@@ -160,7 +165,6 @@ function buildTree(
           const fragment = document.createElement("template").content;
           fragment.appendChild(el);
         }
-        const attrs = (node as Element).attributes;
         for (let i = 0; i < attrs.length; i++) {
           const attrName = attrs[i].name;
           const attrValue = attrs[i].value;

src/runtime/component.ts

@@ -23,7 +23,7 @@ export type ComponentConstructor<P extends Props = any, E = any> = (new (
 
 export class Component<Props = any, Env = any> {
   static template: string = "";
-  static props?: Schema;
+  static props?: any;
   static defaultProps?: any;
 
   props: Props;

src/runtime/component_node.ts

@@ -1,8 +1,7 @@
 import type { App, Env } from "./app";
 import { BDom, VNode } from "./blockdom";
 import { Component, ComponentConstructor, Props } from "./component";
-import { fibersInError } from "./error_handling";
-import { OwlError } from "../common/owl_error";
+import { fibersInError, OwlError } from "./error_handling";
 import { Fiber, makeChildFiber, makeRootFiber, MountFiber, MountOptions } from "./fibers";
 import { clearReactivesForCallback, getSubscriptions, reactive, targets } from "./reactivity";
 import { STATUS } from "./status";

src/runtime/error_handling.ts

@@ -1,7 +1,11 @@
-import { OwlError } from "../common/owl_error";
 import type { ComponentNode } from "./component_node";
 import type { Fiber } from "./fibers";
 
+// Custom error class that wraps error that happen in the owl lifecycle
+export class OwlError extends Error {
+  cause?: any;
+}
+
 // Maps fibers to thrown errors
 export const fibersInError: WeakMap<Fiber, any> = new WeakMap();
 export const nodeErrorHandlers: WeakMap<ComponentNode, ((error: any) => void)[]> = new WeakMap();

src/runtime/event_handling.ts

@@ -1,6 +1,6 @@
 import { filterOutModifiersFromData } from "./blockdom/config";
 import { STATUS } from "./status";
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "./error_handling";
 
 export const mainEventHandler = (data: any, ev: Event, currentTarget?: EventTarget | null) => {
   const { data: _data, modifiers } = filterOutModifiersFromData(data);

src/runtime/fibers.ts

@@ -1,7 +1,6 @@
 import { BDom, mount } from "./blockdom";
 import type { ComponentNode } from "./component_node";
-import { fibersInError } from "./error_handling";
-import { OwlError } from "../common/owl_error";
+import { fibersInError, OwlError } from "./error_handling";
 import { STATUS } from "./status";
 
 export function makeChildFiber(node: ComponentNode, parent: Fiber): Fiber {

src/runtime/hooks.ts

@@ -59,7 +59,7 @@ export function useChildSubEnv(envExtension: Env) {
 // useEffect
 // -----------------------------------------------------------------------------
 
-type EffectDeps<T extends unknown[]> = T | (T extends [...infer H, never] ? EffectDeps<H> : never);
+type EffectDeps<T extends any[]> = T | (T extends [...infer H, never] ? EffectDeps<H> : never);
 
 /**
  * @template T
@@ -67,7 +67,7 @@ type EffectDeps<T extends unknown[]> = T | (T extends [...infer H, never] ? Effe
  * @returns {void|(()=>void)} a cleanup function that reverses the side
  *      effects of the effect callback.
  */
-type Effect<T extends unknown[]> = (...dependencies: EffectDeps<T>) => void | (() => void);
+type Effect<T extends [...T]> = (...dependencies: EffectDeps<T>) => void | (() => void);
 
 /**
  * This hook will run a callback when a component is mounted and patched, and
@@ -76,15 +76,15 @@ type Effect<T extends unknown[]> = (...dependencies: EffectDeps<T>) => void | ((
  *
  * @template T
  * @param {Effect<T>} effect the effect to run on component mount and/or patch
- * @param {()=>[...T]} [computeDependencies=()=>[NaN]] a callback to compute
+ * @param {()=>T} [computeDependencies=()=>[NaN]] a callback to compute
  *      dependencies that will decide if the effect needs to be cleaned up and
  *      run again. If the dependencies did not change, the effect will not run
  *      again. The default value returns an array containing only NaN because
  *      NaN !== NaN, which will cause the effect to rerun on every patch.
  */
-export function useEffect<T extends unknown[]>(
+export function useEffect<T extends [...T]>(
   effect: Effect<T>,
-  computeDependencies: () => [...T] = () => [NaN] as never
+  computeDependencies: () => T = () => [NaN] as never
 ) {
   let cleanup: (() => void) | void;
   let dependencies: T;

src/runtime/index.ts

@@ -55,7 +55,7 @@ export {
   onError,
 } from "./lifecycle_hooks";
 export { validate, validateType } from "./validation";
-export { OwlError } from "../common/owl_error";
+export { OwlError } from "./error_handling";
 
 export const __info__ = {
   version: App.version,

src/runtime/lifecycle_hooks.ts

@@ -1,6 +1,5 @@
 import { getCurrent } from "./component_node";
-import { nodeErrorHandlers } from "./error_handling";
-import { OwlError } from "../common/owl_error";
+import { nodeErrorHandlers, OwlError } from "./error_handling";
 
 const TIMEOUT = Symbol("timeout");
 function wrapError(fn: (...args: any[]) => any, hookName: string) {

src/runtime/portal.ts

@@ -1,7 +1,7 @@
 import { onMounted, onWillUnmount } from "./lifecycle_hooks";
 import { BDom, text, VNode } from "./blockdom";
 import { Component } from "./component";
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "./error_handling";
 
 const VText: any = text("").constructor;
 
@@ -65,7 +65,7 @@ export class Portal extends Component {
       type: String,
     },
     slots: true,
-  } as const;
+  };
 
   setup() {
     const node: any = this.__owl__;

src/runtime/reactivity.ts

@@ -1,5 +1,5 @@
 import type { Callback } from "./utils";
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "./error_handling";
 
 // Special key to subscribe to, to be notified of key creation/deletion
 const KEYCHANGES = Symbol("Key changes");
@@ -20,9 +20,8 @@ type CollectionRawType = "Set" | "Map" | "WeakMap";
 const objectToString = Object.prototype.toString;
 const objectHasOwnProperty = Object.prototype.hasOwnProperty;
 
-// Use arrays because Array.includes is faster than Set.has for small arrays
-const SUPPORTED_RAW_TYPES = ["Object", "Array", "Set", "Map", "WeakMap"];
-const COLLECTION_RAW_TYPES = ["Set", "Map", "WeakMap"];
+const SUPPORTED_RAW_TYPES = new Set(["Object", "Array", "Set", "Map", "WeakMap"]);
+const COLLECTION_RAWTYPES = new Set(["Set", "Map", "WeakMap"]);
 
 /**
  * extract "RawType" from strings like "[object RawType]" => this lets us ignore
@@ -46,7 +45,7 @@ function canBeMadeReactive(value: any): boolean {
   if (typeof value !== "object") {
     return false;
   }
-  return SUPPORTED_RAW_TYPES.includes(rawType(value));
+  return SUPPORTED_RAW_TYPES.has(rawType(value));
 }
 /**
  * Creates a reactive from the given object/callback if possible and returns it,
@@ -221,36 +220,12 @@ export function reactive<T extends Target>(target: T, callback: Callback = NO_CA
   const reactivesForTarget = reactiveCache.get(target)!;
   if (!reactivesForTarget.has(callback)) {
     const targetRawType = rawType(target);
-    const handler = COLLECTION_RAW_TYPES.includes(targetRawType)
+    const handler = COLLECTION_RAWTYPES.has(targetRawType)
       ? collectionsProxyHandler(target as Collection, callback, targetRawType as CollectionRawType)
       : basicProxyHandler<T>(callback);
     const proxy = new Proxy(target, handler as ProxyHandler<T>) as Reactive<T>;
     reactivesForTarget.set(callback, proxy);
     targets.set(proxy, target);
-    // FIXME: this probably slows down reactive creation significantly, we probably don't want to do
-    // it all the time. Maybe should be a separate function.
-    const derivedDescriptors = Object.entries(Object.getOwnPropertyDescriptors(target)).filter(
-      ([k, descriptor]) => {
-        if (toRaw(descriptor.value)?.[IS_DERIVED_DESCRIPTOR]) {
-          delete target[k as keyof typeof target]; // prevent circular call in effect below
-          return true;
-        }
-        return false;
-      }
-    );
-    for (const [
-      key,
-      {
-        value: [deps, compute],
-      },
-    ] of derivedDescriptors) {
-      effect(
-        (proxy, deps) => {
-          proxy[key as keyof typeof proxy] = Reflect.apply(compute, proxy, deps);
-        },
-        [proxy, deps]
-      );
-    }
   }
   return reactivesForTarget.get(callback) as Reactive<T>;
 }
@@ -274,7 +249,7 @@ function basicProxyHandler<T extends Target>(callback: Callback): ProxyHandler<T
     set(target, key, value, receiver) {
       const hadKey = objectHasOwnProperty.call(target, key);
       const originalValue = Reflect.get(target, key, receiver);
-      const ret = Reflect.set(target, key, toRaw(value), receiver);
+      const ret = Reflect.set(target, key, value, receiver);
       if (!hadKey && objectHasOwnProperty.call(target, key)) {
         notifyReactives(target, KEYCHANGES);
       }
@@ -393,7 +368,7 @@ function delegateAndNotify(
     if (hadKey !== hasKey) {
       notifyReactives(target, KEYCHANGES);
     }
-    if (originalValue !== target[getterName](key)) {
+    if (originalValue !== value) {
       notifyReactives(target, key);
     }
     return ret;
@@ -487,18 +462,3 @@ function collectionsProxyHandler<T extends Collection>(
     },
   }) as ProxyHandler<T>;
 }
-
-const IS_DERIVED_DESCRIPTOR = Symbol("is derived descriptor");
-export function derived<T extends Reactive<any>[], U>(deps: T, compute: (...args: T) => U) {
-  return Object.assign([deps, compute], { [IS_DERIVED_DESCRIPTOR]: true }) as unknown as U;
-}
-
-/**
- * Creates a side-effect that runs based on the content of reactive objects.
- */
-export function effect<T extends object[]>(cb: (...args: [...T]) => void, deps: [...T]) {
-  const reactiveDeps = reactive(deps, () => {
-    cb(...reactiveDeps);
-  });
-  cb(...reactiveDeps);
-}

src/runtime/template_helpers.ts

@@ -4,7 +4,7 @@ import { html } from "./blockdom/index";
 import { isOptional, validateSchema } from "./validation";
 import type { ComponentConstructor } from "./component";
 import { markRaw } from "./reactivity";
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "./error_handling";
 import type { ComponentNode } from "./component_node";
 
 const ObjectCreate = Object.create;
@@ -70,12 +70,14 @@ function prepareList(collection: unknown): [unknown[], unknown[], number, undefi
   } else if (collection instanceof Map) {
     keys = [...collection.keys()];
     values = [...collection.values()];
-  } else if (Symbol.iterator in Object(collection)) {
-    keys = [...(<Iterable<unknown>>collection)];
-    values = keys;
   } else if (collection && typeof collection === "object") {
-    values = Object.values(collection);
-    keys = Object.keys(collection);
+    if (Symbol.iterator in collection) {
+      keys = [...(<Iterable<unknown>>collection)];
+      values = keys;
+    } else {
+      values = Object.keys(collection);
+      keys = Object.values(collection);
+    }
   } else {
     throw new OwlError(`Invalid loop expression: "${collection}" is not iterable`);
   }

src/runtime/template_set.ts

@@ -3,17 +3,45 @@ import { comment, createBlock, html, list, multi, text, toggler } from "./blockd
 import { getCurrent } from "./component_node";
 import { Portal, portalTemplate } from "./portal";
 import { helpers } from "./template_helpers";
-import { OwlError } from "../common/owl_error";
-import { parseXML } from "../common/utils";
+import { OwlError } from "./error_handling";
 
 const bdom = { text, createBlock, list, multi, html, toggler, comment };
 
+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 OwlError(msg);
+  }
+  return doc;
+}
+
 export interface TemplateSetConfig {
   dev?: boolean;
   translatableAttributes?: string[];
   translateFn?: (s: string) => string;
-  templates?: string | Document | Record<string, string>;
-  getTemplate?: (s: string) => Element | Function | string | void;
+  templates?: string | Document;
 }
 
 export class TemplateSet {
@@ -23,7 +51,6 @@ export class TemplateSet {
   dev: boolean;
   rawTemplates: typeof globalTemplates = Object.create(globalTemplates);
   templates: { [name: string]: Template } = {};
-  getRawTemplate?: (s: string) => Element | Function | string | void;
   translateFn?: (s: string) => string;
   translatableAttributes?: string[];
   Portal = Portal;
@@ -33,23 +60,12 @@ export class TemplateSet {
     this.translateFn = config.translateFn;
     this.translatableAttributes = config.translatableAttributes;
     if (config.templates) {
-      if (config.templates instanceof Document || typeof config.templates === "string") {
-        this.addTemplates(config.templates);
-      } else {
-        for (const name in config.templates) {
-          this.addTemplate(name, config.templates[name]);
-        }
-      }
+      this.addTemplates(config.templates);
     }
-    this.getRawTemplate = config.getTemplate;
   }
 
   addTemplate(name: string, template: string | Element) {
     if (name in this.rawTemplates) {
-      // this check can be expensive, just silently ignore double definitions outside dev mode
-      if (!this.dev) {
-        return;
-      }
       const rawTemplate = this.rawTemplates[name];
       const currentAsString =
         typeof rawTemplate === "string"
@@ -80,7 +96,7 @@ export class TemplateSet {
 
   getTemplate(name: string): Template {
     if (!(name in this.templates)) {
-      const rawTemplate = this.getRawTemplate?.(name) || this.rawTemplates[name];
+      const rawTemplate = this.rawTemplates[name];
       if (rawTemplate === undefined) {
         let extraInfo = "";
         try {

src/runtime/utils.ts

@@ -1,4 +1,4 @@
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "./error_handling";
 export type Callback = () => void;
 
 /**

src/runtime/validation.ts

@@ -1,4 +1,4 @@
-import { OwlError } from "../common/owl_error";
+import { OwlError } from "./error_handling";
 import { toRaw } from "./reactivity";
 
 type BaseType =
@@ -8,7 +8,6 @@ type BaseType =
   | typeof Date
   | typeof Object
   | typeof Array
-  | typeof Function
   | true
   | "*";
 

src/version.ts

@@ -1,2 +1,2 @@
 // do not modify manually. This file is generated by the release script.
-export const version = "2.2.9";
+export const version = "2.2.3";

tests/__snapshots__/reactivity.test.ts.snap

@@ -353,7 +353,7 @@ exports[`Reactivity: useState useless atoms should be deleted 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(Object.keys(ctx['state']));;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`id\`] = k_block2[i1];
+      ctx[\`id\`] = v_block2[i1];
       const key1 = ctx['id'];
       c_block2[i1] = withKey(comp1({id: ctx['id']}, key + \`__1__\${key1}\`, node, this, null), key1);
     }

tests/app/__snapshots__/app.test.ts.snap

@@ -22,7 +22,7 @@ exports[`app app: clear scheduler tasks and destroy cancelled nodes immediately
   const comp1 = app.createComponent(\`B\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`A\`);
     if (ctx['state'].value) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -32,7 +32,7 @@ exports[`app app: clear scheduler tasks and destroy cancelled nodes immediately
 }"
 `;
 
-exports[`app app: clear scheduler tasks and destroy cancelled nodes immediately on destroy 3`] = `
+exports[`app app: clear scheduler tasks and destroy cancelled nodes immediately on destroy 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -57,19 +57,6 @@ exports[`app can configure an app with props 1`] = `
 }"
 `;
 
-exports[`app can load templates from an object name-string 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  let block1 = createBlock(\`<div class=\\"hello\\">hello</div>\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    return block1();
-  }
-}"
-`;
-
 exports[`app can mount app in an iframe 1`] = `
 "function anonymous(app, bdom, helpers
 ) {

tests/app/app.test.ts

@@ -8,7 +8,6 @@ import {
   useLogLifecycle,
   makeDeferred,
   nextMicroTick,
-  steps,
 } from "../helpers";
 
 let fixture: HTMLElement;
@@ -124,64 +123,23 @@ describe("app", () => {
 
     const app = new App(A);
     const comp = await app.mount(fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "A:setup",
-        "A:willStart",
-        "A:willRender",
-        "A:rendered",
-        "A:mounted",
-      ]
-    `);
+    expect(["A:setup", "A:willStart", "A:willRender", "A:rendered", "A:mounted"]).toBeLogged();
 
     comp.state.value = true;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "A:willRender",
-        "B:setup",
-        "B:willStart",
-        "A:rendered",
-      ]
-    `);
+    expect(["A:willRender", "B:setup", "B:willStart", "A:rendered"]).toBeLogged();
 
     // rerender to force the instantiation of a new B component (and cancelling the first)
     comp.render();
     await nextMicroTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "A:willRender",
-        "B:setup",
-        "B:willStart",
-        "A:rendered",
-      ]
-    `);
+    expect(["A:willRender", "B:setup", "B:willStart", "A:rendered"]).toBeLogged();
 
     app.destroy();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "A:willUnmount",
-        "B:willDestroy",
-        "A:willDestroy",
-        "B:willDestroy",
-      ]
-    `);
-  });
-
-  test("can load templates from an object name-string", async () => {
-    const templates = {
-      hello: `<div class="hello">hello</div>`,
-      world: `<div>world</div>`,
-    };
-    class SomeComponent extends Component {
-      static template = "hello";
-    }
-
-    const app = new App(SomeComponent, { templates });
-    await app.mount(fixture);
-    expect(fixture.querySelector(".hello")).toBeDefined();
-    // Only the "hello" template is used, so the "world" template is not yet loaded
-    expect(Object.keys(app.templates)).toEqual(["hello"]);
-    expect(Object.keys(app.rawTemplates)).toEqual(["hello", "world"]);
+    expect([
+      "A:willUnmount",
+      "B:willDestroy",
+      "A:willDestroy",
+      "B:willDestroy", // make sure the 2 B instances have been destroyed synchronously
+    ]).toBeLogged();
   });
 });

tests/blockdom/block.test.ts

@@ -244,14 +244,12 @@ describe("misc", () => {
   });
 
   test("namespace is not propagated to siblings", () => {
-    const block = createBlock(`<div><svg xmlns="someNameSpace"><g/></svg><div></div></div>`);
+    const block = createBlock(`<div><svg block-ns="someNameSpace"><g/></svg><div></div></div>`);
 
     const fixture = makeTestFixture();
     mount(block(), fixture);
 
-    expect(fixture.innerHTML).toBe(
-      '<div><svg xmlns="someNameSpace"><g></g></svg><div></div></div>'
-    );
+    expect(fixture.innerHTML).toBe("<div><svg><g></g></svg><div></div></div>");
     expect(fixture.querySelector("svg")!.namespaceURI).toBe("someNameSpace");
     expect(fixture.querySelector("g")!.namespaceURI).toBe("someNameSpace");
     const allDivs = fixture.querySelectorAll("div");

tests/blockdom/namespace.test.ts

@@ -30,22 +30,22 @@ describe("namespace", () => {
     expect(fixture.firstElementChild!.namespaceURI).toBe(XHTML_URI);
   });
 
-  test("namespace can be changed with xmlns", () => {
-    const block = createBlock(`<tag xmlns="${SVG_URI}"/>`);
+  test("namespace can be changed with block-ns", () => {
+    const block = createBlock(`<tag block-ns="${SVG_URI}"/>`);
     const tree = block();
     mount(tree, fixture);
-    expect(fixture.innerHTML).toBe(`<tag xmlns="${SVG_URI}"></tag>`);
+    expect(fixture.innerHTML).toBe("<tag></tag>");
     expect(fixture.firstElementChild!.namespaceURI).toBe(SVG_URI);
   });
 
   test("namespace is kept for children", () => {
     const block = createBlock(
-      `<parent xmlns="${SVG_URI}"><child><subchild/></child><child/></parent>`
+      `<parent block-ns="${SVG_URI}"><child><subchild/></child><child/></parent>`
     );
     const tree = block();
     mount(tree, fixture);
     expect(fixture.innerHTML).toBe(
-      `<parent xmlns="${SVG_URI}"><child><subchild></subchild></child><child></child></parent>`
+      "<parent><child><subchild></subchild></child><child></child></parent>"
     );
     const parent = fixture.firstElementChild!;
     const child1 = parent.firstElementChild!;
@@ -58,10 +58,10 @@ describe("namespace", () => {
   });
 
   test("various namespaces in same block", () => {
-    const block = createBlock(`<none><one xmlns="one"/><two xmlns="two"/></none>`);
+    const block = createBlock(`<none><one block-ns="one"/><two block-ns="two"/></none>`);
     const tree = block();
     mount(tree, fixture);
-    expect(fixture.innerHTML).toBe('<none><one xmlns="one"></one><two xmlns="two"></two></none>');
+    expect(fixture.innerHTML).toBe("<none><one></one><two></two></none>");
     const none = fixture.firstElementChild!;
     const one = none.firstElementChild!;
     const two = one.nextElementSibling!;

tests/compiler/__snapshots__/comments.test.ts.snap

@@ -34,7 +34,7 @@ exports[`comments properly handle comments between t-if/t-else 1`] = `
   let block3 = createBlock(\`<span>owl</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (true) {
       b2 = block2();
     } else {

tests/compiler/__snapshots__/event_handling.test.ts.snap

@@ -72,7 +72,7 @@ exports[`t-on can bind handlers with empty object (with non empty inner string)
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(['someval']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`action\`] = k_block2[i1];
+      ctx[\`action\`] = v_block2[i1];
       ctx[\`action_index\`] = i1;
       const key1 = ctx['action_index'];
       const v1 = ctx['activate'];
@@ -142,7 +142,7 @@ exports[`t-on handler is bound to proper owner, part 2 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([1]);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`value\`] = k_block1[i1];
+      ctx[\`value\`] = v_block1[i1];
       const key1 = ctx['value'];
       let hdlr1 = [ctx['add'], ctx];
       c_block1[i1] = withKey(block2([hdlr1]), key1);
@@ -189,11 +189,11 @@ exports[`t-on handler is bound to proper owner, part 4 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([1]);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`value\`] = k_block1[i1];
+      ctx[\`value\`] = v_block1[i1];
       ctx[\`value_first\`] = i1 === 0;
-      ctx[\`value_last\`] = i1 === k_block1.length - 1;
+      ctx[\`value_last\`] = i1 === v_block1.length - 1;
       ctx[\`value_index\`] = i1;
-      ctx[\`value_value\`] = v_block1[i1];
+      ctx[\`value_value\`] = k_block1[i1];
       const key1 = ctx['value'];
       c_block1[i1] = withKey(callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}\`), key1);
     }
@@ -348,7 +348,7 @@ exports[`t-on t-on modifiers (native listener) t-on with prevent modifier in t-f
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['projects']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`project\`] = k_block2[i1];
+      ctx[\`project\`] = v_block2[i1];
       const key1 = ctx['project'];
       const v1 = ctx['onEdit'];
       const v2 = ctx['project'];

tests/compiler/__snapshots__/misc.test.ts.snap

@@ -18,7 +18,7 @@ exports[`misc complex template 1`] = `
   let block13 = createBlock(\`<i class=\\"fa fa-fw fa-clock-o\\" title=\\"This commit is the head of a base branch\\"/>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4, b6, b8;
+    let b2,b3,b4,b6,b8;
     let attr1 = \`batch_tile \${ctx['options'].more?'more':'nomore'}\`;
     let attr2 = \`card bg-\${ctx['klass']}-light\`;
     let attr3 = \`/runbot/batch/\${ctx['batch'].id}\`;
@@ -33,7 +33,7 @@ exports[`misc complex template 1`] = `
     ctx = Object.create(ctx);
     const [k_block4, v_block4, l_block4, c_block4] = prepareList(ctx['batch'].slot_ids.filter(_slot=>_slot.build_id.id&&!_slot.trigger_id.manual&&(ctx['options'].trigger_display[_slot.trigger_id.id])));;
     for (let i1 = 0; i1 < l_block4; i1++) {
-      ctx[\`slot\`] = k_block4[i1];
+      ctx[\`slot\`] = v_block4[i1];
       const key1 = ctx['slot'].id;
       c_block4[i1] = withKey(comp1({class: ctx['slot_container'],slot: ctx['slot']}, key + \`__1__\${key1}\`, node, this, null), key1);
     }
@@ -42,7 +42,7 @@ exports[`misc complex template 1`] = `
     ctx = Object.create(ctx);
     const [k_block6, v_block6, l_block6, c_block6] = prepareList([1,2,3,4]);;
     for (let i1 = 0; i1 < l_block6; i1++) {
-      ctx[\`x\`] = k_block6[i1];
+      ctx[\`x\`] = v_block6[i1];
       const key1 = ctx['x'];
       c_block6[i1] = withKey(block7(), key1);
     }
@@ -51,9 +51,9 @@ exports[`misc complex template 1`] = `
     ctx = Object.create(ctx);
     const [k_block8, v_block8, l_block8, c_block8] = prepareList(ctx['commit_links']);;
     for (let i1 = 0; i1 < l_block8; i1++) {
-      ctx[\`commit_link\`] = k_block8[i1];
+      ctx[\`commit_link\`] = v_block8[i1];
       const key1 = ctx['commit_link'].id;
-      let b10, b11, b12, b13;
+      let b10,b11,b12,b13;
       let attr5 = \`/runbot/commit/\${ctx['commit_link'].commit_id}\`;
       let attr6 = \`badge badge-light batch_commit match_type_\${ctx['commit_link'].match_type}\`;
       if (ctx['commit_link'].match_type=='new') {
@@ -99,11 +99,11 @@ exports[`misc global 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList([4,5,6]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`value\`] = k_block2[i1];
+      ctx[\`value\`] = v_block2[i1];
       ctx[\`value_first\`] = i1 === 0;
-      ctx[\`value_last\`] = i1 === k_block2.length - 1;
+      ctx[\`value_last\`] = i1 === v_block2.length - 1;
       ctx[\`value_index\`] = i1;
-      ctx[\`value_value\`] = v_block2[i1];
+      ctx[\`value_value\`] = k_block2[i1];
       const key1 = ctx['value'];
       let txt1 = ctx['value'];
       const b4 = block4([txt1]);
@@ -112,16 +112,16 @@ exports[`misc global 1`] = `
       ctx = Object.create(ctx);
       ctx[isBoundary] = 1;
       setContextValue(ctx, \\"foo\\", 'aaa');
-      const b7 = callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}\`);
+      const b6 = callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}\`);
       ctx = ctx.__proto__;
-      const b8 = callTemplate_2.call(this, ctx, node, key + \`__2__\${key1}\`);
+      const b7 = callTemplate_2.call(this, ctx, node, key + \`__2__\${key1}\`);
       setContextValue(ctx, \\"foo\\", 'bbb');
-      const b9 = callTemplate_3.call(this, ctx, node, key + \`__3__\${key1}\`);
-      const b6 = multi([b7, b8, b9]);
-      ctx[zero] = b6;
-      const b5 = callTemplate_4.call(this, ctx, node, key + \`__4__\${key1}\`);
+      const b8 = callTemplate_3.call(this, ctx, node, key + \`__3__\${key1}\`);
+      const b5 = multi([b6, b7, b8]);
+      ctx[zero] = b5;
+      const b9 = callTemplate_4.call(this, ctx, node, key + \`__4__\${key1}\`);
       ctx = ctx.__proto__;
-      c_block2[i1] = withKey(multi([b4, b5]), key1);
+      c_block2[i1] = withKey(multi([b4, b9]), key1);
     }
     ctx = ctx.__proto__;
     const b2 = list(c_block2);
@@ -217,13 +217,13 @@ exports[`misc other complex template 1`] = `
   let block25 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b4, b14, b17, b22, b23, b24, b25;
+    let b2,b4,b14,b17,b22,b23,b24,b25;
     let attr1 = \`/runbot/\${ctx['project'].slug}\`;
     let txt1 = ctx['project'].name;
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['projects']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`project\`] = k_block2[i1];
+      ctx[\`project\`] = v_block2[i1];
       const key1 = ctx['project'].id;
       let hdlr1 = [ctx['selectProject'](ctx['project']), ctx];
       let txt2 = ctx['project'].name;
@@ -232,12 +232,12 @@ exports[`misc other complex template 1`] = `
     ctx = ctx.__proto__;
     b2 = list(c_block2);
     if (ctx['user']) {
-      let b5, b6;
+      let b5,b6;
       if (ctx['user'].public) {
         let attr2 = \`/web/login?redirect=/\`;
         b5 = block5([attr2]);
       } else {
-        let b7, b10, b13;
+        let b7,b10,b13;
         if (ctx['nb_assigned_errors']&&ctx['nb_assigned_errors']>0) {
           let attr3 = \`You have \${ctx['nb_assigned_errors']} random bug assigned\`;
           let txt3 = ctx['nb_assigned_errors'];
@@ -263,7 +263,7 @@ exports[`misc other complex template 1`] = `
       ctx = Object.create(ctx);
       const [k_block15, v_block15, l_block15, c_block15] = prepareList(ctx['categories']);;
       for (let i1 = 0; i1 < l_block15; i1++) {
-        ctx[\`category\`] = k_block15[i1];
+        ctx[\`category\`] = v_block15[i1];
         const key1 = ctx['category'].id;
         let attr6 = ctx['category'].id;
         let prop1 = new Boolean(ctx['category'].id==ctx['options'].active_category_id);
@@ -284,7 +284,7 @@ exports[`misc other complex template 1`] = `
       ctx = Object.create(ctx);
       const [k_block18, v_block18, l_block18, c_block18] = prepareList(ctx['triggers']);;
       for (let i1 = 0; i1 < l_block18; i1++) {
-        ctx[\`trigger\`] = k_block18[i1];
+        ctx[\`trigger\`] = v_block18[i1];
         const key1 = ctx['trigger'].id;
         let b20;
         if (!ctx['trigger'].manual&&ctx['trigger'].project_id===ctx['project'].id&&ctx['trigger'].category_id===ctx['options'].active_category_id) {

tests/compiler/__snapshots__/qweb_memory.test.ts.snap

@@ -12,7 +12,7 @@ exports[`memory t-foreach does not leak stuff in global scope 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList([3,2,1]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       ctx[\`item_index\`] = i1;
       const key1 = ctx['item_index'];
       c_block2[i1] = withKey(text(ctx['item']), key1);

tests/compiler/__snapshots__/svg.test.ts.snap

@@ -5,7 +5,7 @@ exports[`properly support svg add proper namespace to g tags 1`] = `
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<g xmlns=\\"http://www.w3.org/2000/svg\\"><circle cx=\\"50\\" cy=\\"50\\" r=\\"4\\" stroke=\\"green\\" stroke-width=\\"1\\" fill=\\"yellow\\"/> </g>\`);
+  let block1 = createBlock(\`<g block-ns=\\"http://www.w3.org/2000/svg\\"><circle cx=\\"50\\" cy=\\"50\\" r=\\"4\\" stroke=\\"green\\" stroke-width=\\"1\\" fill=\\"yellow\\"/> </g>\`);
   
   return function template(ctx, node, key = \\"\\") {
     return block1();
@@ -18,7 +18,7 @@ exports[`properly support svg add proper namespace to svg 1`] = `
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\" width=\\"100px\\" height=\\"90px\\"><circle cx=\\"50\\" cy=\\"50\\" r=\\"4\\" stroke=\\"green\\" stroke-width=\\"1\\" fill=\\"yellow\\"/> </svg>\`);
+  let block1 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\" width=\\"100px\\" height=\\"90px\\"><circle cx=\\"50\\" cy=\\"50\\" r=\\"4\\" stroke=\\"green\\" stroke-width=\\"1\\" fill=\\"yellow\\"/> </svg>\`);
   
   return function template(ctx, node, key = \\"\\") {
     return block1();
@@ -31,7 +31,7 @@ exports[`properly support svg namespace to g tags not added if already in svg na
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><g/></svg>\`);
+  let block1 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><g/></svg>\`);
   
   return function template(ctx, node, key = \\"\\") {
     return block1();
@@ -44,7 +44,7 @@ exports[`properly support svg namespace to svg tags added even if already in svg
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><svg/></svg>\`);
+  let block1 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><svg/></svg>\`);
   
   return function template(ctx, node, key = \\"\\") {
     return block1();
@@ -58,8 +58,8 @@ exports[`properly support svg svg creates new block if it is within html -- 2 1`
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block2 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><polygon fill=\\"#000000\\" points=\\"0 0 4 4 8 0\\" transform=\\"translate(5 7)\\"/><block-child-0 xmlns=\\"\\"/></svg>\`);
-  let block3 = createBlock(\`<path xmlns=\\"http://www.w3.org/2000/svg\\"/>\`);
+  let block2 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><polygon fill=\\"#000000\\" points=\\"0 0 4 4 8 0\\" transform=\\"translate(5 7)\\"/><block-child-0/></svg>\`);
+  let block3 = createBlock(\`<path block-ns=\\"http://www.w3.org/2000/svg\\"/>\`);
   
   return function template(ctx, node, key = \\"\\") {
     let b3;
@@ -78,7 +78,7 @@ exports[`properly support svg svg creates new block if it is within html 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block2 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><polygon fill=\\"#000000\\" points=\\"0 0 4 4 8 0\\" transform=\\"translate(5 7)\\"/></svg>\`);
+  let block2 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><polygon fill=\\"#000000\\" points=\\"0 0 4 4 8 0\\" transform=\\"translate(5 7)\\"/></svg>\`);
   
   return function template(ctx, node, key = \\"\\") {
     const b2 = block2();
@@ -93,7 +93,7 @@ exports[`properly support svg svg namespace added to sub templates if root tag i
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   const callTemplate_1 = app.getTemplate(\`path\`);
   
-  let block1 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><block-child-0 xmlns=\\"\\"/></svg>\`);
+  let block1 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><block-child-0/></svg>\`);
   
   return function template(ctx, node, key = \\"\\") {
     const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
@@ -107,7 +107,7 @@ exports[`properly support svg svg namespace added to sub templates if root tag i
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<path xmlns=\\"http://www.w3.org/2000/svg\\"/>\`);
+  let block1 = createBlock(\`<path block-ns=\\"http://www.w3.org/2000/svg\\"/>\`);
   
   return function template(ctx, node, key = \\"\\") {
     return block1();
@@ -120,8 +120,8 @@ exports[`properly support svg svg namespace added to sub-blocks 1`] = `
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><block-child-0 xmlns=\\"\\"/></svg>\`);
-  let block2 = createBlock(\`<path xmlns=\\"http://www.w3.org/2000/svg\\"/>\`);
+  let block1 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><block-child-0/></svg>\`);
+  let block2 = createBlock(\`<path block-ns=\\"http://www.w3.org/2000/svg\\"/>\`);
   
   return function template(ctx, node, key = \\"\\") {
     let b2;

tests/compiler/__snapshots__/t_call.test.ts.snap

@@ -61,19 +61,19 @@ exports[`t-call (template calling) call with several sub nodes on same line 1`]
   const callTemplate_1 = app.getTemplate(\`sub\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block4 = createBlock(\`<span>hey</span>\`);
-  let block6 = createBlock(\`<span>yay</span>\`);
+  let block3 = createBlock(\`<span>hey</span>\`);
+  let block5 = createBlock(\`<span>yay</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b4 = block4();
-    const b5 = text(\` \`);
-    const b6 = block6();
-    const b3 = multi([b4, b5, b6]);
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b3 = block3();
+    const b4 = text(\` \`);
+    const b5 = block5();
+    const b2 = multi([b3, b4, b5]);
+    ctx[zero] = b2;
+    const b6 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b6]);
   }
 }"
 `;
@@ -101,19 +101,19 @@ exports[`t-call (template calling) cascading t-call t-out='0' 1`] = `
   const callTemplate_1 = app.getTemplate(\`subTemplate\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block4 = createBlock(\`<span>hey</span>\`);
-  let block6 = createBlock(\`<span>yay</span>\`);
+  let block3 = createBlock(\`<span>hey</span>\`);
+  let block5 = createBlock(\`<span>yay</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b4 = block4();
-    const b5 = text(\` \`);
-    const b6 = block6();
-    const b3 = multi([b4, b5, b6]);
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b3 = block3();
+    const b4 = text(\` \`);
+    const b5 = block5();
+    const b2 = multi([b3, b4, b5]);
+    ctx[zero] = b2;
+    const b6 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b6]);
   }
 }"
 `;
@@ -126,17 +126,17 @@ exports[`t-call (template calling) cascading t-call t-out='0' 2`] = `
   const callTemplate_1 = app.getTemplate(\`subSubTemplate\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block4 = createBlock(\`<span>cascade 0</span>\`);
+  let block3 = createBlock(\`<span>cascade 0</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b4 = block4();
-    const b5 = ctx[zero];
-    const b3 = multi([b4, b5]);
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b3 = block3();
+    const b4 = ctx[zero];
+    const b2 = multi([b3, b4]);
+    ctx[zero] = b2;
+    const b5 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b5]);
   }
 }"
 `;
@@ -149,17 +149,17 @@ exports[`t-call (template calling) cascading t-call t-out='0' 3`] = `
   const callTemplate_1 = app.getTemplate(\`finalTemplate\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block4 = createBlock(\`<span>cascade 1</span>\`);
+  let block3 = createBlock(\`<span>cascade 1</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b4 = block4();
-    const b5 = ctx[zero];
-    const b3 = multi([b4, b5]);
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b3 = block3();
+    const b4 = ctx[zero];
+    const b2 = multi([b3, b4]);
+    ctx[zero] = b2;
+    const b5 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b5]);
   }
 }"
 `;
@@ -186,17 +186,17 @@ exports[`t-call (template calling) cascading t-call t-out='0', without external
   let { isBoundary, zero } = helpers;
   const callTemplate_1 = app.getTemplate(\`subTemplate\`);
   
-  let block3 = createBlock(\`<span>hey</span>\`);
-  let block5 = createBlock(\`<span>yay</span>\`);
+  let block2 = createBlock(\`<span>hey</span>\`);
+  let block4 = createBlock(\`<span>yay</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    const b4 = text(\` \`);
-    const b5 = block5();
-    const b2 = multi([b3, b4, b5]);
-    ctx[zero] = b2;
+    const b2 = block2();
+    const b3 = text(\` \`);
+    const b4 = block4();
+    const b1 = multi([b2, b3, b4]);
+    ctx[zero] = b1;
     return callTemplate_1.call(this, ctx, node, key + \`__1\`);
   }
 }"
@@ -209,15 +209,15 @@ exports[`t-call (template calling) cascading t-call t-out='0', without external
   let { isBoundary, zero } = helpers;
   const callTemplate_1 = app.getTemplate(\`subSubTemplate\`);
   
-  let block3 = createBlock(\`<span>cascade 0</span>\`);
+  let block2 = createBlock(\`<span>cascade 0</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    const b4 = ctx[zero];
-    const b2 = multi([b3, b4]);
-    ctx[zero] = b2;
+    const b2 = block2();
+    const b3 = ctx[zero];
+    const b1 = multi([b2, b3]);
+    ctx[zero] = b1;
     return callTemplate_1.call(this, ctx, node, key + \`__1\`);
   }
 }"
@@ -230,15 +230,15 @@ exports[`t-call (template calling) cascading t-call t-out='0', without external
   let { isBoundary, zero } = helpers;
   const callTemplate_1 = app.getTemplate(\`finalTemplate\`);
   
-  let block3 = createBlock(\`<span>cascade 1</span>\`);
+  let block2 = createBlock(\`<span>cascade 1</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    const b4 = ctx[zero];
-    const b2 = multi([b3, b4]);
-    ctx[zero] = b2;
+    const b2 = block2();
+    const b3 = ctx[zero];
+    const b1 = multi([b2, b3]);
+    ctx[zero] = b1;
     return callTemplate_1.call(this, ctx, node, key + \`__1\`);
   }
 }"
@@ -342,15 +342,15 @@ exports[`t-call (template calling) nested t-calls with magic variable 0 1`] = `
   const callTemplate_1 = app.getTemplate(\`grandchild\`);
   const callTemplate_2 = app.getTemplate(\`child\`);
   
-  let block3 = createBlock(\`<p>Some content...</p>\`);
+  let block1 = createBlock(\`<p>Some content...</p>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    ctx[zero] = b3;
+    const b1 = block1();
+    ctx[zero] = b1;
     const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
     ctx = ctx.__proto__;
     ctx[zero] = b2;
@@ -440,11 +440,11 @@ exports[`t-call (template calling) recursive template, part 2 2`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['node'].children||[]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`subtree\`] = k_block2[i1];
+      ctx[\`subtree\`] = v_block2[i1];
       ctx[\`subtree_first\`] = i1 === 0;
-      ctx[\`subtree_last\`] = i1 === k_block2.length - 1;
+      ctx[\`subtree_last\`] = i1 === v_block2.length - 1;
       ctx[\`subtree_index\`] = i1;
-      ctx[\`subtree_value\`] = v_block2[i1];
+      ctx[\`subtree_value\`] = k_block2[i1];
       const key1 = ctx['subtree_index'];
       ctx = Object.create(ctx);
       ctx[isBoundary] = 1;
@@ -495,11 +495,11 @@ exports[`t-call (template calling) recursive template, part 3 2`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['node'].children||[]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`subtree\`] = k_block2[i1];
+      ctx[\`subtree\`] = v_block2[i1];
       ctx[\`subtree_first\`] = i1 === 0;
-      ctx[\`subtree_last\`] = i1 === k_block2.length - 1;
+      ctx[\`subtree_last\`] = i1 === v_block2.length - 1;
       ctx[\`subtree_index\`] = i1;
-      ctx[\`subtree_value\`] = v_block2[i1];
+      ctx[\`subtree_value\`] = k_block2[i1];
       const key1 = ctx['subtree_index'];
       ctx = Object.create(ctx);
       ctx[isBoundary] = 1;
@@ -553,11 +553,11 @@ exports[`t-call (template calling) recursive template, part 4: with t-set recurs
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['node'].children||[]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`subtree\`] = k_block2[i1];
+      ctx[\`subtree\`] = v_block2[i1];
       ctx[\`subtree_first\`] = i1 === 0;
-      ctx[\`subtree_last\`] = i1 === k_block2.length - 1;
+      ctx[\`subtree_last\`] = i1 === v_block2.length - 1;
       ctx[\`subtree_index\`] = i1;
-      ctx[\`subtree_value\`] = v_block2[i1];
+      ctx[\`subtree_value\`] = k_block2[i1];
       const key1 = ctx['subtree_index'];
       ctx = Object.create(ctx);
       ctx[isBoundary] = 1;
@@ -571,134 +571,6 @@ exports[`t-call (template calling) recursive template, part 4: with t-set recurs
 }"
 `;
 
-exports[`t-call (template calling) root t-call with body: t-foreach 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { isBoundary, prepareList, withKey, zero } = helpers;
-  const callTemplate_1 = app.getTemplate(\`subTemplate\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    ctx = Object.create(ctx);
-    ctx[isBoundary] = 1;
-    ctx = Object.create(ctx);
-    const [k_block2, v_block2, l_block2, c_block2] = prepareList([1]);;
-    for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`i\`] = k_block2[i1];
-      const key1 = ctx['i'];
-      c_block2[i1] = withKey(text(\`1\`), key1);
-    }
-    ctx = ctx.__proto__;
-    const b2 = list(c_block2);
-    ctx[zero] = b2;
-    return callTemplate_1.call(this, ctx, node, key + \`__1\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-foreach 2`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  return function template(ctx, node, key = \\"\\") {
-    return text(\`sub\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-if false 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { isBoundary, zero } = helpers;
-  const callTemplate_1 = app.getTemplate(\`subTemplate\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    ctx = Object.create(ctx);
-    ctx[isBoundary] = 1;
-    let b3;
-    if (false) {
-      b3 = text(\`zero\`);
-    }
-    const b2 = multi([b3]);
-    ctx[zero] = b2;
-    return callTemplate_1.call(this, ctx, node, key + \`__1\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-if false 2`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  return function template(ctx, node, key = \\"\\") {
-    return text(\`sub\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-if true 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { isBoundary, zero } = helpers;
-  const callTemplate_1 = app.getTemplate(\`subTemplate\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    ctx = Object.create(ctx);
-    ctx[isBoundary] = 1;
-    let b3;
-    if (true) {
-      b3 = text(\`zero\`);
-    }
-    const b2 = multi([b3]);
-    ctx[zero] = b2;
-    return callTemplate_1.call(this, ctx, node, key + \`__1\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-if true 2`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  return function template(ctx, node, key = \\"\\") {
-    return text(\`sub\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-out with default 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { isBoundary, safeOutput, zero } = helpers;
-  const callTemplate_1 = app.getTemplate(\`subTemplate\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    ctx = Object.create(ctx);
-    ctx[isBoundary] = 1;
-    const b2 = safeOutput(ctx['nothing']);
-    ctx[zero] = b2;
-    return callTemplate_1.call(this, ctx, node, key + \`__1\`);
-  }
-}"
-`;
-
-exports[`t-call (template calling) root t-call with body: t-out with default 2`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  return function template(ctx, node, key = \\"\\") {
-    return text(\`sub\`);
-  }
-}"
-`;
-
 exports[`t-call (template calling) scoped parameters 1`] = `
 "function anonymous(app, bdom, helpers
 ) {
@@ -833,13 +705,13 @@ exports[`t-call (template calling) t-call with body content as root of a templat
   let { isBoundary, zero } = helpers;
   const callTemplate_1 = app.getTemplate(\`antony\`);
   
-  let block2 = createBlock(\`<p>antony</p>\`);
+  let block1 = createBlock(\`<p>antony</p>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b2 = block2();
-    ctx[zero] = b2;
+    const b1 = block1();
+    ctx[zero] = b1;
     return callTemplate_1.call(this, ctx, node, key + \`__1\`);
   }
 }"
@@ -941,11 +813,11 @@ exports[`t-call (template calling) t-call with t-set inside and outside 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['list']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`v\`] = k_block2[i1];
+      ctx[\`v\`] = v_block2[i1];
       ctx[\`v_first\`] = i1 === 0;
-      ctx[\`v_last\`] = i1 === k_block2.length - 1;
+      ctx[\`v_last\`] = i1 === v_block2.length - 1;
       ctx[\`v_index\`] = i1;
-      ctx[\`v_value\`] = v_block2[i1];
+      ctx[\`v_value\`] = k_block2[i1];
       const key1 = ctx['v_index'];
       setContextValue(ctx, \\"val\\", ctx['v'].val);
       ctx = Object.create(ctx);
@@ -1008,11 +880,11 @@ exports[`t-call (template calling) t-call with t-set inside and outside. 2 2`] =
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['list']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`v\`] = k_block2[i1];
+      ctx[\`v\`] = v_block2[i1];
       ctx[\`v_first\`] = i1 === 0;
-      ctx[\`v_last\`] = i1 === k_block2.length - 1;
+      ctx[\`v_last\`] = i1 === v_block2.length - 1;
       ctx[\`v_index\`] = i1;
-      ctx[\`v_value\`] = v_block2[i1];
+      ctx[\`v_value\`] = k_block2[i1];
       const key1 = ctx['v_index'];
       setContextValue(ctx, \\"val\\", ctx['v'].val);
       ctx = Object.create(ctx);
@@ -1056,7 +928,7 @@ exports[`t-call (template calling) t-call, conditional and t-set in t-call body
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1
-    let b2, b3;
+    let b2,b3;
     setContextValue(ctx, \\"v1\\", 'elif');
     if (ctx['v1']==='if') {
       b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
@@ -1203,8 +1075,8 @@ exports[`t-call (template calling) with unused body 1`] = `
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b2 = text(\`WHEEE\`);
-    ctx[zero] = b2;
+    const b1 = text(\`WHEEE\`);
+    ctx[zero] = b1;
     return callTemplate_1.call(this, ctx, node, key + \`__1\`);
   }
 }"
@@ -1264,8 +1136,8 @@ exports[`t-call (template calling) with used body 1`] = `
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b2 = text(\`ok\`);
-    ctx[zero] = b2;
+    const b1 = text(\`ok\`);
+    ctx[zero] = b1;
     return callTemplate_1.call(this, ctx, node, key + \`__1\`);
   }
 }"

tests/compiler/__snapshots__/t_esc.test.ts.snap

@@ -180,15 +180,15 @@ exports[`t-esc t-esc=0 is escaped 1`] = `
   const callTemplate_1 = app.getTemplate(\`sub\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block3 = createBlock(\`<p>escaped</p>\`);
+  let block2 = createBlock(\`<p>escaped</p>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b2 = block2();
+    ctx[zero] = b2;
+    const b3 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b3]);
   }
 }"
 `;

tests/compiler/__snapshots__/t_for.test.ts.snap

@@ -0,0 +1,670 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`t-for destructuring array items 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ([ctx['key'],ctx['value']] of Object.entries({a:1,b:2})) {
+      const key1 = ctx['key'];
+      const b3 = text(\`(\`);
+      const b4 = text(ctx['key']);
+      const b5 = text(\`: \`);
+      const b6 = text(ctx['value']);
+      const b7 = text(\`)\`);
+      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for destructuring array items: rest 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ([ctx['head'],...ctx['tail']] of [[1,2,3],[4,5,6]]) {
+      const key1 = ctx['head'];
+      const b3 = text(\`(\`);
+      const b4 = text(ctx['head']);
+      const b5 = text(\`;\`);
+      const b6 = text(ctx['tail']);
+      const b7 = text(\`)\`);
+      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for destructuring object items 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ({k:ctx['k'],v:ctx['v']} of [{k:'a',v:1},{k:'b',v:2}]) {
+      const key1 = ctx['k'];
+      const b3 = text(\`(\`);
+      const b4 = text(ctx['k']);
+      const b5 = text(\`: \`);
+      const b6 = text(ctx['v']);
+      const b7 = text(\`)\`);
+      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for destructuring object items: rest 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ({k:ctx['k'],v:ctx['v']} of [{k:'a',v:1},{k:'b',v:2}]) {
+      const key1 = ctx['k'];
+      const b3 = text(\`(\`);
+      const b4 = text(ctx['k']);
+      const b5 = text(\`: \`);
+      const b6 = text(ctx['v']);
+      const b7 = text(\`)\`);
+      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for does not pollute the rendering context 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['item'] of [1]) {
+      const key1 = ctx['item'];
+      c_block2[i1] = withKey(text(ctx['item']), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for iterate on items (on a element node) 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<span><block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['item'] of [1,2]) {
+      const key1 = ctx['item'];
+      let txt1 = ctx['item'];
+      c_block2[i1] = withKey(block3([txt1]), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for iterate, Map param 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ([ctx['key'],ctx['value']] of ctx['map']) {
+      const key1 = ctx['key'];
+      const b3 = text(\` [\`);
+      const b4 = text(ctx['key']);
+      const b5 = text(\`: \`);
+      const b6 = text(ctx['value']);
+      const b7 = text(\`] \`);
+      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for iterate, Set param 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of ctx['set']) {
+      const key1 = ctx['item'];
+      c_block1[i1] = withKey(text(ctx['item']), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for iterate, generator param 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of ctx['gen']()) {
+      const key1 = ctx['item'];
+      c_block1[i1] = withKey(text(ctx['item']), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for iterate, iterable param 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of ctx['map'].values()) {
+      const key1 = ctx['item'];
+      c_block1[i1] = withKey(text(ctx['item']), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for nested destructuring 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ([ctx['key'],{left:ctx['left'],right:ctx['right']}] of Object.entries(ctx['obj'])) {
+      const key1 = ctx['key'];
+      const b3 = text(\`(\`);
+      const b4 = text(ctx['key']);
+      const b5 = text(\`: [\`);
+      const b6 = text(ctx['left']);
+      const b7 = text(\`, \`);
+      const b8 = text(ctx['right']);
+      const b9 = text(\`])\`);
+      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7, b8, b9]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for simple iteration (in a node) 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['item'] of [3,2,1]) {
+      const key1 = ctx['item'];
+      c_block2[i1] = withKey(text(ctx['item']), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for simple iteration 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of [3,2,1]) {
+      const key1 = ctx['item'];
+      c_block1[i1] = withKey(text(ctx['item']), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for simple iteration with two nodes inside 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block3 = createBlock(\`<span>a<block-text-0/></span>\`);
+  let block4 = createBlock(\`<span>b<block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of [3,2,1]) {
+      const key1 = ctx['item'];
+      let txt1 = ctx['item'];
+      const b3 = block3([txt1]);
+      let txt2 = ctx['item'];
+      const b4 = block4([txt2]);
+      c_block1[i1] = withKey(multi([b3, b4]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for t-call with body in t-for in t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { isBoundary, withDefault, setContextValue, withKey } = helpers;
+  const callTemplate_1 = app.getTemplate(\`sub\`);
+  
+  let block1 = createBlock(\`<div><block-child-0/><span>[<block-text-0/>][<block-text-1/>][<block-text-2/>]</span></div>\`);
+  let block6 = createBlock(\`<span><block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    ctx[isBoundary] = 1
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['a'] of ctx['numbers']) {
+      const key1 = ctx['a'];
+      ctx = Object.create(ctx);
+      const c_block4 = [];
+      let i2 = 0;
+      for (ctx['b'] of ctx['letters']) {
+        const key2 = ctx['b'];
+        ctx = Object.create(ctx);
+        ctx[isBoundary] = 1;
+        setContextValue(ctx, \\"c\\", 'x'+'_'+ctx['a']+'_'+ctx['b']);
+        c_block4[i2] = withKey(callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}__\${key2}\`), key2);
+        ctx = ctx.__proto__;
+        i2++;
+      }
+      ctx = ctx.__proto__;
+      const b4 = list(c_block4);
+      let txt1 = ctx['c'];
+      const b6 = block6([txt1]);
+      c_block2[i1] = withKey(multi([b4, b6]), key1);
+      i1++;
+    }
+    ctx = ctx.__proto__;
+    const b2 = list(c_block2);
+    let txt2 = ctx['a'];
+    let txt3 = ctx['b'];
+    let txt4 = ctx['c'];
+    return block1([txt2, txt3, txt4], [b2]);
+  }
+}"
+`;
+
+exports[`t-for t-call with body in t-for in t-for 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  return function template(ctx, node, key = \\"\\") {
+    const b2 = text(\` [\`);
+    const b3 = text(ctx['a']);
+    const b4 = text(\`] [\`);
+    const b5 = text(ctx['b']);
+    const b6 = text(\`] [\`);
+    const b7 = text(ctx['c']);
+    const b8 = text(\`] \`);
+    return multi([b2, b3, b4, b5, b6, b7, b8]);
+  }
+}"
+`;
+
+exports[`t-for t-call without body in t-for in t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const callTemplate_1 = app.getTemplate(\`sub\`);
+  
+  let block1 = createBlock(\`<div><block-child-0/><span>[<block-text-0/>][<block-text-1/>][<block-text-2/>]</span></div>\`);
+  let block6 = createBlock(\`<span><block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['a'] of ctx['numbers']) {
+      const key1 = ctx['a'];
+      ctx = Object.create(ctx);
+      const c_block4 = [];
+      let i2 = 0;
+      for (ctx['b'] of ctx['letters']) {
+        const key2 = ctx['b'];
+        c_block4[i2] = withKey(callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}__\${key2}\`), key2);
+        i2++;
+      }
+      ctx = ctx.__proto__;
+      const b4 = list(c_block4);
+      let txt1 = ctx['c'];
+      const b6 = block6([txt1]);
+      c_block2[i1] = withKey(multi([b4, b6]), key1);
+      i1++;
+    }
+    ctx = ctx.__proto__;
+    const b2 = list(c_block2);
+    let txt2 = ctx['a'];
+    let txt3 = ctx['b'];
+    let txt4 = ctx['c'];
+    return block1([txt2, txt3, txt4], [b2]);
+  }
+}"
+`;
+
+exports[`t-for t-call without body in t-for in t-for 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { isBoundary, withDefault, setContextValue } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    ctx[isBoundary] = 1
+    setContextValue(ctx, \\"c\\", 'x'+'_'+ctx['a']+'_'+ctx['b']);
+    const b2 = text(\` [\`);
+    const b3 = text(ctx['a']);
+    const b4 = text(\`] [\`);
+    const b5 = text(ctx['b']);
+    const b6 = text(\`] [\`);
+    const b7 = text(ctx['c']);
+    const b8 = text(\`] \`);
+    return multi([b2, b3, b4, b5, b6, b7, b8]);
+  }
+}"
+`;
+
+exports[`t-for t-for in t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['number'] of ctx['numbers']) {
+      const key1 = ctx['number'];
+      ctx = Object.create(ctx);
+      const c_block3 = [];
+      let i2 = 0;
+      for (ctx['letter'] of ctx['letters']) {
+        const key2 = ctx['letter'];
+        const b5 = text(\` [\`);
+        const b6 = text(ctx['number']);
+        const b7 = text(ctx['letter']);
+        const b8 = text(\`] \`);
+        c_block3[i2] = withKey(multi([b5, b6, b7, b8]), key2);
+        i2++;
+      }
+      ctx = ctx.__proto__;
+      c_block2[i1] = withKey(list(c_block3), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for t-for in t-foreach 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { prepareList, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['numbers']);;
+    for (let i1 = 0; i1 < l_block2; i1++) {
+      ctx[\`number\`] = v_block2[i1];
+      const key1 = ctx['number'];
+      ctx = Object.create(ctx);
+      const c_block3 = [];
+      let i2 = 0;
+      for (ctx['letter'] of ctx['letters']) {
+        const key2 = ctx['letter'];
+        const b5 = text(\` [\`);
+        const b6 = text(ctx['number']);
+        const b7 = text(ctx['letter']);
+        const b8 = text(\`] \`);
+        c_block3[i2] = withKey(multi([b5, b6, b7, b8]), key2);
+        i2++;
+      }
+      ctx = ctx.__proto__;
+      c_block2[i1] = withKey(list(c_block3), key1);
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for t-for with t-if inside (no external node) 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block3 = createBlock(\`<span><block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for ({id:ctx['id'],text:ctx['text']} of ctx['elems']) {
+      const key1 = ctx['id'];
+      let b3;
+      if (ctx['id']<3) {
+        let txt1 = ctx['text'];
+        b3 = block3([txt1]);
+      }
+      c_block1[i1] = withKey(multi([b3]), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`t-for t-for with t-if inside 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block4 = createBlock(\`<span><block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for ({id:ctx['id'],text:ctx['text']} of ctx['elems']) {
+      const key1 = ctx['id'];
+      let b4;
+      if (ctx['id']<3) {
+        let txt1 = ctx['text'];
+        b4 = block4([txt1]);
+      }
+      c_block2[i1] = withKey(multi([b4]), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for t-foreach in t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { prepareList, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['number'] of ctx['numbers']) {
+      const key1 = ctx['number'];
+      ctx = Object.create(ctx);
+      const [k_block3, v_block3, l_block3, c_block3] = prepareList(ctx['letters']);;
+      for (let i2 = 0; i2 < l_block3; i2++) {
+        ctx[\`letter\`] = v_block3[i2];
+        const key2 = ctx['letter'];
+        const b5 = text(\` [\`);
+        const b6 = text(ctx['number']);
+        const b7 = text(ctx['letter']);
+        const b8 = text(\`] \`);
+        c_block3[i2] = withKey(multi([b5, b6, b7, b8]), key2);
+      }
+      ctx = ctx.__proto__;
+      c_block2[i1] = withKey(list(c_block3), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for t-key on t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<span/>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['thing'] of ctx['things']) {
+      const key1 = ctx['thing'];
+      c_block2[i1] = withKey(block3(), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-for throws error if invalid loop expression 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<span/>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['item'] of ctx['abc']) {
+      const key1 = ctx['item'];
+      const tKey_1 = ctx['item'];
+      c_block2[i1] = withKey(block3(), tKey_1 + key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;

tests/compiler/__snapshots__/t_foreach.test.ts.snap

@@ -12,7 +12,7 @@ exports[`t-foreach does not pollute the rendering context 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList([1]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       c_block2[i1] = withKey(text(ctx['item']), key1);
     }
@@ -35,7 +35,7 @@ exports[`t-foreach iterate on items (on a element node) 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList([1,2]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       let txt1 = ctx['item'];
       c_block2[i1] = withKey(block3([txt1]), key1);
@@ -58,9 +58,9 @@ exports[`t-foreach iterate on items 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList([3,2,1]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block2[i1];
+      ctx[\`item_value\`] = k_block2[i1];
       const key1 = ctx['item'];
       const b4 = text(\` [\`);
       const b5 = text(ctx['item_index']);
@@ -87,9 +87,9 @@ exports[`t-foreach iterate, Map param 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['value']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block1[i1];
+      ctx[\`item_value\`] = k_block1[i1];
       const key1 = ctx['item_index'];
       const b3 = text(\` [\`);
       const b4 = text(ctx['item_index']);
@@ -115,9 +115,9 @@ exports[`t-foreach iterate, Set param 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['value']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block1[i1];
+      ctx[\`item_value\`] = k_block1[i1];
       const key1 = ctx['item_index'];
       const b3 = text(\` [\`);
       const b4 = text(ctx['item_index']);
@@ -145,9 +145,9 @@ exports[`t-foreach iterate, dict param 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['value']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block2[i1];
+      ctx[\`item_value\`] = k_block2[i1];
       const key1 = ctx['item_index'];
       const b4 = text(\` [\`);
       const b5 = text(ctx['item_index']);
@@ -174,9 +174,9 @@ exports[`t-foreach iterate, generator param 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['gen']());;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block1[i1];
+      ctx[\`item_value\`] = k_block1[i1];
       const key1 = ctx['item_index'];
       const b3 = text(\` [\`);
       const b4 = text(ctx['item_index']);
@@ -202,9 +202,9 @@ exports[`t-foreach iterate, iterable param 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['map'].values());;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block1[i1];
+      ctx[\`item_value\`] = k_block1[i1];
       const key1 = ctx['item_index'];
       const b3 = text(\` [\`);
       const b4 = text(ctx['item_index']);
@@ -232,12 +232,12 @@ exports[`t-foreach iterate, position 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(Array(5));;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`elem\`] = k_block2[i1];
+      ctx[\`elem\`] = v_block2[i1];
       ctx[\`elem_first\`] = i1 === 0;
-      ctx[\`elem_last\`] = i1 === k_block2.length - 1;
+      ctx[\`elem_last\`] = i1 === v_block2.length - 1;
       ctx[\`elem_index\`] = i1;
       const key1 = ctx['elem'];
-      let b4, b5, b6, b7, b8, b9;
+      let b4,b5,b6,b7,b8,b9;
       b4 = text(\` -\`);
       if (ctx['elem_first']) {
         b5 = text(\` first\`);
@@ -256,34 +256,6 @@ exports[`t-foreach iterate, position 1`] = `
 }"
 `;
 
-exports[`t-foreach iterate, string param 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { prepareList, withKey } = helpers;
-  
-  return function template(ctx, node, key = \\"\\") {
-    ctx = Object.create(ctx);
-    const [k_block1, v_block1, l_block1, c_block1] = prepareList('abc');;
-    for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
-      ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block1[i1];
-      const key1 = ctx['item_index'];
-      const b3 = text(\` [\`);
-      const b4 = text(ctx['item_index']);
-      const b5 = text(\`: \`);
-      const b6 = text(ctx['item']);
-      const b7 = text(\` \`);
-      const b8 = text(ctx['item_value']);
-      const b9 = text(\`] \`);
-      c_block1[i1] = withKey(multi([b3, b4, b5, b6, b7, b8, b9]), key1);
-    }
-    return list(c_block1);
-  }
-}"
-`;
-
 exports[`t-foreach simple iteration (in a node) 1`] = `
 "function anonymous(app, bdom, helpers
 ) {
@@ -296,7 +268,7 @@ exports[`t-foreach simple iteration (in a node) 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList([3,2,1]);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       c_block2[i1] = withKey(text(ctx['item']), key1);
     }
@@ -316,7 +288,7 @@ exports[`t-foreach simple iteration 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([3,2,1]);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       const key1 = ctx['item'];
       c_block1[i1] = withKey(text(ctx['item']), key1);
     }
@@ -338,7 +310,7 @@ exports[`t-foreach simple iteration with two nodes inside 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([3,2,1]);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       const key1 = ctx['item'];
       let txt1 = ctx['item'];
       const b3 = block3([txt1]);
@@ -367,20 +339,20 @@ exports[`t-foreach t-call with body in t-foreach in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['numbers']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`a\`] = k_block2[i1];
+      ctx[\`a\`] = v_block2[i1];
       ctx[\`a_first\`] = i1 === 0;
-      ctx[\`a_last\`] = i1 === k_block2.length - 1;
+      ctx[\`a_last\`] = i1 === v_block2.length - 1;
       ctx[\`a_index\`] = i1;
-      ctx[\`a_value\`] = v_block2[i1];
+      ctx[\`a_value\`] = k_block2[i1];
       const key1 = ctx['a'];
       ctx = Object.create(ctx);
       const [k_block4, v_block4, l_block4, c_block4] = prepareList(ctx['letters']);;
       for (let i2 = 0; i2 < l_block4; i2++) {
-        ctx[\`b\`] = k_block4[i2];
+        ctx[\`b\`] = v_block4[i2];
         ctx[\`b_first\`] = i2 === 0;
-        ctx[\`b_last\`] = i2 === k_block4.length - 1;
+        ctx[\`b_last\`] = i2 === v_block4.length - 1;
         ctx[\`b_index\`] = i2;
-        ctx[\`b_value\`] = v_block4[i2];
+        ctx[\`b_value\`] = k_block4[i2];
         const key2 = ctx['b'];
         ctx = Object.create(ctx);
         ctx[isBoundary] = 1;
@@ -436,20 +408,20 @@ exports[`t-foreach t-call without body in t-foreach in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['numbers']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`a\`] = k_block2[i1];
+      ctx[\`a\`] = v_block2[i1];
       ctx[\`a_first\`] = i1 === 0;
-      ctx[\`a_last\`] = i1 === k_block2.length - 1;
+      ctx[\`a_last\`] = i1 === v_block2.length - 1;
       ctx[\`a_index\`] = i1;
-      ctx[\`a_value\`] = v_block2[i1];
+      ctx[\`a_value\`] = k_block2[i1];
       const key1 = ctx['a'];
       ctx = Object.create(ctx);
       const [k_block4, v_block4, l_block4, c_block4] = prepareList(ctx['letters']);;
       for (let i2 = 0; i2 < l_block4; i2++) {
-        ctx[\`b\`] = k_block4[i2];
+        ctx[\`b\`] = v_block4[i2];
         ctx[\`b_first\`] = i2 === 0;
-        ctx[\`b_last\`] = i2 === k_block4.length - 1;
+        ctx[\`b_last\`] = i2 === v_block4.length - 1;
         ctx[\`b_index\`] = i2;
-        ctx[\`b_value\`] = v_block4[i2];
+        ctx[\`b_value\`] = k_block4[i2];
         const key2 = ctx['b'];
         c_block4[i2] = withKey(callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}__\${key2}\`), key2);
       }
@@ -503,12 +475,12 @@ exports[`t-foreach t-foreach in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['numbers']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`number\`] = k_block2[i1];
+      ctx[\`number\`] = v_block2[i1];
       const key1 = ctx['number'];
       ctx = Object.create(ctx);
       const [k_block3, v_block3, l_block3, c_block3] = prepareList(ctx['letters']);;
       for (let i2 = 0; i2 < l_block3; i2++) {
-        ctx[\`letter\`] = k_block3[i2];
+        ctx[\`letter\`] = v_block3[i2];
         const key2 = ctx['letter'];
         const b5 = text(\` [\`);
         const b6 = text(ctx['number']);
@@ -537,7 +509,7 @@ exports[`t-foreach t-foreach with t-if inside (no external node) 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['elems']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`elem\`] = k_block1[i1];
+      ctx[\`elem\`] = v_block1[i1];
       const key1 = ctx['elem'].id;
       let b3;
       if (ctx['elem'].id<3) {
@@ -564,7 +536,7 @@ exports[`t-foreach t-foreach with t-if inside 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['elems']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`elem\`] = k_block2[i1];
+      ctx[\`elem\`] = v_block2[i1];
       const key1 = ctx['elem'].id;
       let b4;
       if (ctx['elem'].id<3) {
@@ -592,7 +564,7 @@ exports[`t-foreach t-key on t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['things']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`thing\`] = k_block2[i1];
+      ctx[\`thing\`] = v_block2[i1];
       const key1 = ctx['thing'];
       c_block2[i1] = withKey(block3(), key1);
     }
@@ -615,7 +587,7 @@ exports[`t-foreach throws error if invalid loop expression 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['abc']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       ctx[\`item_index\`] = i1;
       const key1 = ctx['item'];
       const tKey_1 = ctx['item_index'];
@@ -642,7 +614,7 @@ exports[`t-foreach with t-memo 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'].id;
       const memo1 = [ctx['item'].x];
       const vnode1 = cache[key1];;

tests/compiler/__snapshots__/t_if.test.ts.snap

@@ -8,7 +8,7 @@ exports[`t-if a t-if next to a div 1`] = `
   let block2 = createBlock(\`<div>foo</div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = block2();
     if (ctx['cond']) {
       b3 = text(\`1\`);
@@ -44,7 +44,7 @@ exports[`t-if boolean value condition elif (no outside node) 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4, b5;
+    let b2,b3,b4,b5;
     if (ctx['color']=='black') {
       b2 = text(\`black pearl\`);
     } else if (ctx['color']=='yellow') {
@@ -67,7 +67,7 @@ exports[`t-if boolean value condition elif 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-2/><block-child-3/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4, b5;
+    let b2,b3,b4,b5;
     if (ctx['color']=='black') {
       b2 = text(\`black pearl\`);
     } else if (ctx['color']=='yellow') {
@@ -90,7 +90,7 @@ exports[`t-if boolean value condition else 1`] = `
   let block1 = createBlock(\`<div><span>begin</span><block-child-0/><block-child-1/><span>end</span></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       b2 = text(\`ok\`);
     } else {
@@ -109,7 +109,7 @@ exports[`t-if boolean value condition false else 1`] = `
   let block1 = createBlock(\`<div><span>begin</span><block-child-0/><block-child-1/><span>end</span></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       b2 = text(\`fail\`);
     } else {
@@ -145,7 +145,7 @@ exports[`t-if can use some boolean operators in expressions 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-2/><block-child-3/><block-child-4/><block-child-5/><block-child-6/><block-child-7/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4, b5, b6, b7, b8, b9;
+    let b2,b3,b4,b5,b6,b7,b8,b9;
     if (ctx['cond1']&&ctx['cond2']) {
       b2 = text(\`and\`);
     }
@@ -239,7 +239,7 @@ exports[`t-if simple t-if/t-else 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       b2 = text(\`1\`);
     } else {
@@ -258,7 +258,7 @@ exports[`t-if simple t-if/t-else in a div 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       b2 = text(\`1\`);
     } else {
@@ -277,7 +277,7 @@ exports[`t-if t-esc with t-elif 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (false) {
       b2 = text(\`abc\`);
     } else {
@@ -314,7 +314,7 @@ exports[`t-if t-if and t-else with two nodes 1`] = `
   let block5 = createBlock(\`<span>b</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       b2 = text(\`1\`);
     } else {
@@ -372,7 +372,7 @@ exports[`t-if t-if with empty content 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`hello\`);
     if (ctx['condition']) {
       b3 = text(\`\`);
@@ -388,7 +388,7 @@ exports[`t-if t-if/t-else with more content 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       if (ctx['condition']) {
         b2 = text(\`asf\`);
@@ -458,7 +458,7 @@ exports[`t-if t-set, then t-if, part 3 1`] = `
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1
-    let b2, b3;
+    let b2,b3;
     setContextValue(ctx, \\"y\\", false);
     setContextValue(ctx, \\"x\\", ctx['y']);
     if (ctx['x']) {
@@ -477,7 +477,7 @@ exports[`t-if two consecutive t-if 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['cond1']) {
       b2 = text(\`1\`);
     }
@@ -497,7 +497,7 @@ exports[`t-if two consecutive t-if in a div 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['cond1']) {
       b2 = text(\`1\`);
     }
@@ -520,7 +520,7 @@ exports[`t-if two t-ifs next to each other 1`] = `
   let block5 = createBlock(\`<p>2</p>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       let txt1 = ctx['text'];
       b2 = block2([txt1]);

tests/compiler/__snapshots__/t_key.test.ts.snap

@@ -58,7 +58,7 @@ exports[`t-key t-key directive in a list 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['beers']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`beer\`] = k_block2[i1];
+      ctx[\`beer\`] = v_block2[i1];
       const key1 = ctx['beer'].id;
       let txt1 = ctx['beer'].name;
       c_block2[i1] = withKey(block3([txt1]), key1);
@@ -79,7 +79,7 @@ exports[`t-key t-key on sub dom node pushes a child block in its parent 1`] = `
   let block3 = createBlock(\`<div><h1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['hasSpan']) {
       b2 = block2();
     }

tests/compiler/__snapshots__/t_out.test.ts.snap

@@ -35,15 +35,15 @@ exports[`t-out multiple calls to t-out 1`] = `
   const callTemplate_1 = app.getTemplate(\`sub\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block3 = createBlock(\`<span>coucou</span>\`);
+  let block2 = createBlock(\`<span>coucou</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b2 = block2();
+    ctx[zero] = b2;
+    const b3 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b3]);
   }
 }"
 `;
@@ -102,15 +102,15 @@ exports[`t-out t-out 0 1`] = `
   const callTemplate_1 = app.getTemplate(\`_basic-callee\`);
   
   let block1 = createBlock(\`<div><block-child-0/></div>\`);
-  let block3 = createBlock(\`<div>zero</div>\`);
+  let block2 = createBlock(\`<div>zero</div>\`);
   
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b3 = block3();
-    ctx[zero] = b3;
-    const b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
-    return block1([], [b2]);
+    const b2 = block2();
+    ctx[zero] = b2;
+    const b3 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
+    return block1([], [b3]);
   }
 }"
 `;
@@ -309,7 +309,7 @@ exports[`t-out t-out switch markup on bdom 1`] = `
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1
-    let b3, b5;
+    let b3,b5;
     ctx[\`bdom\`] = new LazyValue(value1, ctx, this, node, key);
     if (ctx['hasBdom']) {
       const b4 = safeOutput(ctx['bdom']);

tests/compiler/__snapshots__/t_ref.test.ts.snap

@@ -105,7 +105,7 @@ exports[`t-ref refs in a loop 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       const tKey_1 = ctx['item'];
       const v1 = ctx['item'];

tests/compiler/__snapshots__/t_set.test.ts.snap

@@ -94,7 +94,7 @@ exports[`t-set set from body literal (with t-if/t-else 1`] = `
   let { isBoundary, withDefault, LazyValue } = helpers;
   
   function value1(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['condition']) {
       b2 = text(\`true\`);
     } else {
@@ -335,6 +335,99 @@ exports[`t-set t-set evaluates an expression only once 1`] = `
 }"
 `;
 
+exports[`t-set t-set outside modified in t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { isBoundary, withDefault, setContextValue, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/><p>EndLoop: <block-text-0/></p></div>\`);
+  let block3 = createBlock(\`<p>InLoop: <block-text-0/></p>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    ctx[isBoundary] = 1
+    setContextValue(ctx, \\"iter\\", 0);
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['val'] of ['a','b']) {
+      const key1 = ctx['val'];
+      let txt1 = ctx['iter'];
+      c_block2[i1] = withKey(block3([txt1]), key1);
+      setContextValue(ctx, \\"iter\\", ctx['iter']+1);
+      i1++;
+    }
+    ctx = ctx.__proto__;
+    const b2 = list(c_block2);
+    let txt2 = ctx['iter'];
+    return block1([txt2], [b2]);
+  }
+}"
+`;
+
+exports[`t-set t-set outside modified in t-for increment-after operator 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { isBoundary, withDefault, setContextValue, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/><p>EndLoop: <block-text-0/></p></div>\`);
+  let block3 = createBlock(\`<p>InLoop: <block-text-0/></p>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    ctx[isBoundary] = 1
+    setContextValue(ctx, \\"iter\\", 0);
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['val'] of ['a','b']) {
+      const key1 = ctx['val'];
+      let txt1 = ctx['iter'];
+      c_block2[i1] = withKey(block3([txt1]), key1);
+      setContextValue(ctx, \\"iter\\", ctx['iter']++);
+      i1++;
+    }
+    ctx = ctx.__proto__;
+    const b2 = list(c_block2);
+    let txt2 = ctx['iter'];
+    return block1([txt2], [b2]);
+  }
+}"
+`;
+
+exports[`t-set t-set outside modified in t-for increment-before operator 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { isBoundary, withDefault, setContextValue, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/><p>EndLoop: <block-text-0/></p></div>\`);
+  let block3 = createBlock(\`<p>InLoop: <block-text-0/></p>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    ctx[isBoundary] = 1
+    setContextValue(ctx, \\"iter\\", 0);
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['val'] of ['a','b']) {
+      const key1 = ctx['val'];
+      let txt1 = ctx['iter'];
+      c_block2[i1] = withKey(block3([txt1]), key1);
+      setContextValue(ctx, \\"iter\\", ++ctx['iter']);
+      i1++;
+    }
+    ctx = ctx.__proto__;
+    const b2 = list(c_block2);
+    let txt2 = ctx['iter'];
+    return block1([txt2], [b2]);
+  }
+}"
+`;
+
 exports[`t-set t-set outside modified in t-foreach 1`] = `
 "function anonymous(app, bdom, helpers
 ) {
@@ -351,7 +444,7 @@ exports[`t-set t-set outside modified in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(['a','b']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       const key1 = ctx['val'];
       let txt1 = ctx['iter'];
       c_block2[i1] = withKey(block3([txt1]), key1);
@@ -381,7 +474,7 @@ exports[`t-set t-set outside modified in t-foreach increment-after operator 1`]
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(['a','b']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       const key1 = ctx['val'];
       let txt1 = ctx['iter'];
       c_block2[i1] = withKey(block3([txt1]), key1);
@@ -411,7 +504,7 @@ exports[`t-set t-set outside modified in t-foreach increment-before operator 1`]
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(['a','b']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       const key1 = ctx['val'];
       let txt1 = ctx['iter'];
       c_block2[i1] = withKey(block3([txt1]), key1);
@@ -441,7 +534,7 @@ exports[`t-set t-set should reuse variable if possible 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['list']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`elem\`] = k_block2[i1];
+      ctx[\`elem\`] = v_block2[i1];
       ctx[\`elem_index\`] = i1;
       const key1 = ctx['elem_index'];
       let txt1 = ctx['v'];
@@ -454,6 +547,35 @@ exports[`t-set t-set should reuse variable if possible 1`] = `
 }"
 `;
 
+exports[`t-set t-set should reuse variable if possible: for..of 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { isBoundary, withDefault, setContextValue, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<div><span>v<block-text-0/></span></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    ctx[isBoundary] = 1
+    setContextValue(ctx, \\"v\\", 1);
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['elem'] of ctx['list']) {
+      const key1 = ctx['elem_index'];
+      let txt1 = ctx['v'];
+      setContextValue(ctx, \\"v\\", ctx['elem']);
+      c_block2[i1] = withKey(block3([txt1]), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
 exports[`t-set t-set with content and sub t-esc 1`] = `
 "function anonymous(app, bdom, helpers
 ) {

tests/compiler/__snapshots__/template_set.test.ts.snap

@@ -101,55 +101,3 @@ exports[`loading templates can load a few templates from an XMLDocument 2`] = `
   }
 }"
 `;
-
-exports[`loading templates getTemplate: element returned (2) 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  let block1 = createBlock(\`<div>Hello World!</div>\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    return block1();
-  }
-}"
-`;
-
-exports[`loading templates getTemplate: element returned 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  let block1 = createBlock(\`<div>Hello World!</div>\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    return block1();
-  }
-}"
-`;
-
-exports[`loading templates getTemplate: template string returned 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  let block1 = createBlock(\`<div>Hello World!</div>\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    return block1();
-  }
-}"
-`;
-
-exports[`loading templates getTemplate: undefined returned 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  
-  let block1 = createBlock(\`<div>Hello World!</div>\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    return block1();
-  }
-}"
-`;

tests/compiler/svg.test.ts

@@ -9,20 +9,20 @@ describe("properly support svg", () => {
   test("add proper namespace to svg", () => {
     const template = `<svg width="100px" height="90px"><circle cx="50" cy="50" r="4" stroke="green" stroke-width="1" fill="yellow"/> </svg>`;
     expect(renderToString(template)).toBe(
-      `<svg xmlns="http://www.w3.org/2000/svg" width="100px" height="90px"><circle cx="50" cy="50" r="4" stroke="green" stroke-width="1" fill="yellow"></circle> </svg>`
+      `<svg width=\"100px\" height=\"90px\"><circle cx=\"50\" cy=\"50\" r=\"4\" stroke=\"green\" stroke-width=\"1\" fill=\"yellow\"></circle> </svg>`
     );
   });
 
   test("add proper namespace to g tags", () => {
     const template = `<g><circle cx="50" cy="50" r="4" stroke="green" stroke-width="1" fill="yellow"/> </g>`;
     expect(renderToString(template)).toBe(
-      `<g xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="4" stroke="green" stroke-width="1" fill="yellow"></circle> </g>`
+      `<g><circle cx=\"50\" cy=\"50\" r=\"4\" stroke=\"green\" stroke-width=\"1\" fill=\"yellow\"></circle> </g>`
     );
   });
 
   test("namespace to g tags not added if already in svg namespace", () => {
     const template = `<svg><g/></svg>`;
-    expect(renderToString(template)).toBe(`<svg xmlns="http://www.w3.org/2000/svg"><g></g></svg>`);
+    expect(renderToString(template)).toBe(`<svg><g></g></svg>`);
   });
 
   test("namespace to svg tags added even if already in svg namespace", () => {
@@ -41,13 +41,8 @@ describe("properly support svg", () => {
   test("svg namespace added to sub-blocks", () => {
     const template = `<svg><path t-if="path"/></svg>`;
 
-    expect(renderToString(template, { path: false })).toBe(
-      `<svg xmlns="http://www.w3.org/2000/svg"></svg>`
-    );
-    // Because the path is its own block, it has its own xmlns attribute
-    expect(renderToString(template, { path: true })).toBe(
-      `<svg xmlns="http://www.w3.org/2000/svg"><path xmlns="http://www.w3.org/2000/svg"></path></svg>`
-    );
+    expect(renderToString(template, { path: false })).toBe(`<svg></svg>`);
+    expect(renderToString(template, { path: true })).toBe(`<svg><path></path></svg>`);
 
     const bdom = renderToBdom(template, { path: true });
     const fixture = makeTestFixture();

tests/compiler/t_call.test.ts

@@ -430,48 +430,6 @@ describe("t-call (template calling)", () => {
     expect(context.renderToString("main")).toBe(expected);
   });
 
-  test("root t-call with body: t-if true", () => {
-    const context = new TestContext();
-    const subTemplate = `sub`;
-    const main = `<t t-call="subTemplate"><t t-if="true">zero</t></t>`;
-    context.addTemplate("subTemplate", subTemplate);
-    context.addTemplate("main", main);
-    const expected = "sub";
-    expect(context.renderToString("main")).toBe(expected);
-  });
-
-  test("root t-call with body: t-if false", () => {
-    const context = new TestContext();
-    const subTemplate = `sub`;
-    const main = `<t t-call="subTemplate"><t t-if="false">zero</t></t>`;
-    context.addTemplate("subTemplate", subTemplate);
-    context.addTemplate("main", main);
-    const expected = "sub";
-    expect(context.renderToString("main")).toBe(expected);
-  });
-
-  test("root t-call with body: t-out with default", () => {
-    const context = new TestContext();
-    const subTemplate = `sub`;
-    const main = `<t t-call="subTemplate"><t t-out="nothing">default</t></t>`;
-    context.addTemplate("subTemplate", subTemplate);
-    context.addTemplate("main", main);
-    const expected = "sub";
-    expect(context.renderToString("main")).toBe(expected);
-  });
-
-  test("root t-call with body: t-foreach", () => {
-    const context = new TestContext();
-    const subTemplate = `sub`;
-    const main = `<t t-call="subTemplate">
-      <t t-foreach="[1]" t-as="i" t-key="i">1</t>
-    </t>`;
-    context.addTemplate("subTemplate", subTemplate);
-    context.addTemplate("main", main);
-    const expected = "sub";
-    expect(context.renderToString("main")).toBe(expected);
-  });
-
   test("dynamic t-call", () => {
     const context = new TestContext();
     const foo = `<foo><t t-esc="val"/></foo>`;

tests/compiler/t_for.test.ts

@@ -0,0 +1,317 @@
+import {
+  renderToBdom,
+  renderToString,
+  snapshotEverything,
+  TestContext,
+  makeTestFixture,
+} from "../helpers";
+import { mount, patch } from "../../src/runtime/blockdom";
+
+snapshotEverything();
+
+// -----------------------------------------------------------------------------
+// t-for
+// -----------------------------------------------------------------------------
+
+describe("t-for", () => {
+  test("simple iteration", () => {
+    const template = `<t t-for="item" t-of="[3, 2, 1]" t-key="item"><t t-esc="item"/></t>`;
+    expect(renderToString(template)).toBe("321");
+  });
+
+  test("simple iteration with two nodes inside", () => {
+    const template = `
+      <t t-for="item" t-of="[3, 2, 1]" t-key="item">
+        <span>a<t t-esc="item"/></span>
+        <span>b<t t-esc="item"/></span>
+      </t>`;
+    const expected =
+      "<span>a3</span><span>b3</span><span>a2</span><span>b2</span><span>a1</span><span>b1</span>";
+    expect(renderToString(template)).toBe(expected);
+  });
+
+  test("destructuring array items", () => {
+    const template = `<t t-for="[key, value]" t-of="Object.entries({ a: 1, b: 2 })" t-key="key">(<t t-esc="key"/>: <t t-esc="value"/>)</t>`;
+    expect(renderToString(template)).toBe("(a: 1)(b: 2)");
+  });
+
+  test("destructuring array items: rest", () => {
+    const template = `<t t-for="[head, ...tail]" t-of="[[1, 2, 3], [4, 5, 6]]" t-key="head">(<t t-esc="head"/>;<t t-esc="tail"/>)</t>`;
+    expect(renderToString(template)).toBe("(1;2,3)(4;5,6)");
+  });
+
+  test("destructuring object items", () => {
+    const template = `<t t-for="{ k, v }" t-of="[{ k: 'a', v: 1 }, { k: 'b', v: 2 }]" t-key="k">(<t t-esc="k"/>: <t t-esc="v"/>)</t>`;
+    expect(renderToString(template)).toBe("(a: 1)(b: 2)");
+  });
+
+  test("destructuring object items: rest", () => {
+    const template = `<t t-for="{ k, v }" t-of="[{ k: 'a', v: 1 }, { k: 'b', v: 2 }]" t-key="k">(<t t-esc="k"/>: <t t-esc="v"/>)</t>`;
+    expect(renderToString(template)).toBe("(a: 1)(b: 2)");
+  });
+
+  test("nested destructuring", () => {
+    const template = `<t t-for="[key, {left, right}]" t-of="Object.entries(obj)" t-key="key">(<t t-esc="key"/>: [<t t-esc="left"/>, <t t-esc="right"/>])</t>`;
+    expect(
+      renderToString(template, {
+        obj: {
+          a: { left: 1, right: 2 },
+          b: { left: 3, right: 4 },
+        },
+      })
+    ).toBe("(a: [1, 2])(b: [3, 4])");
+  });
+
+  test("t-key on t-for", async () => {
+    const template = `
+        <div>
+          <t t-for="thing" t-of="things" t-key="thing">
+            <span/>
+          </t>
+        </div>`;
+
+    const fixture = makeTestFixture();
+
+    const vnode1 = renderToBdom(template, { things: [1, 2] });
+    mount(vnode1, fixture);
+    let elm = fixture;
+    expect(elm.innerHTML).toBe("<div><span></span><span></span></div>");
+    const first = elm.querySelectorAll("span")[0];
+    const second = elm.querySelectorAll("span")[1];
+
+    const vnode2 = renderToBdom(template, { things: [2, 1] });
+    patch(vnode1, vnode2);
+
+    expect(elm.innerHTML).toBe("<div><span></span><span></span></div>");
+    expect(first).toBe(elm.querySelectorAll("span")[1]);
+    expect(second).toBe(elm.querySelectorAll("span")[0]);
+  });
+
+  test("simple iteration (in a node)", () => {
+    const template = `
+        <div>
+          <t t-for="item" t-of="[3, 2, 1]" t-key="item"><t t-esc="item"/></t>
+        </div>`;
+    expect(renderToString(template)).toBe("<div>321</div>");
+  });
+
+  test("iterate on items (on a element node)", () => {
+    const template = `
+        <div>
+          <span t-for="item" t-of="[1, 2]" t-key="item"><t t-esc="item"/></span>
+        </div>`;
+    const expected = `<div><span>1</span><span>2</span></div>`;
+    expect(renderToString(template)).toBe(expected);
+  });
+
+  test("iterate, Map param", () => {
+    const template = `
+      <t t-for="[key, value]" t-of="map" t-key="key">
+        [<t t-esc="key"/>: <t t-esc="value"/>]
+      </t>`;
+    const expected = ` [a: 1]  [b: 2]  [c: 3] `;
+    const context = {
+      map: new Map([
+        ["a", 1],
+        ["b", 2],
+        ["c", 3],
+      ]),
+    };
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("iterate, Set param", () => {
+    const template = `
+      <t t-for="item" t-of="set" t-key="item">
+        <t t-esc="item"/>
+      </t>`;
+    const expected = `123`;
+    const context = { set: new Set([1, 2, 3]) };
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("iterate, iterable param", () => {
+    const template = `
+      <t t-for="item" t-of="map.values()" t-key="item">
+        <t t-esc="item"/>
+      </t>`;
+    const expected = `123`;
+    const context = {
+      map: new Map([
+        ["a", 1],
+        ["b", 2],
+        ["c", 3],
+      ]),
+    };
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("iterate, generator param", () => {
+    const template = `
+      <t t-for="item" t-of="gen()" t-key="item">
+        <t t-esc="item"/>
+      </t>`;
+    const expected = `123`;
+    const context = {
+      *gen() {
+        yield 1;
+        yield 2;
+        yield 3;
+      },
+    };
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("does not pollute the rendering context", () => {
+    const template = `
+        <div>
+          <t t-for="item" t-of="[1]" t-key="item"><t t-esc="item"/></t>
+        </div>`;
+    const context = { __owl__: {} };
+    renderToString(template, context);
+    expect(Object.keys(context)).toEqual(["__owl__"]);
+  });
+
+  test("t-for in t-for", () => {
+    const template = `
+        <div>
+          <t t-for="number" t-of="numbers" t-key="number">
+            <t t-for="letter" t-of="letters" t-key="letter">
+              [<t t-esc="number"/><t t-esc="letter"/>]
+            </t>
+          </t>
+        </div>`;
+
+    const context = { numbers: [1, 2, 3], letters: ["a", "b"] };
+    const expected = "<div> [1a]  [1b]  [2a]  [2b]  [3a]  [3b] </div>";
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("t-for in t-foreach", () => {
+    const template = `
+        <div>
+          <t t-foreach="numbers" t-as="number" t-key="number">
+            <t t-for="letter" t-of="letters" t-key="letter">
+              [<t t-esc="number"/><t t-esc="letter"/>]
+            </t>
+          </t>
+        </div>`;
+
+    const context = { numbers: [1, 2, 3], letters: ["a", "b"] };
+    const expected = "<div> [1a]  [1b]  [2a]  [2b]  [3a]  [3b] </div>";
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("t-foreach in t-for", () => {
+    const template = `
+        <div>
+          <t t-for="number" t-of="numbers" t-key="number">
+            <t t-foreach="letters" t-as="letter" t-key="letter">
+              [<t t-esc="number"/><t t-esc="letter"/>]
+            </t>
+          </t>
+        </div>`;
+
+    const context = { numbers: [1, 2, 3], letters: ["a", "b"] };
+    const expected = "<div> [1a]  [1b]  [2a]  [2b]  [3a]  [3b] </div>";
+    expect(renderToString(template, context)).toBe(expected);
+  });
+
+  test("t-call without body in t-for in t-for", () => {
+    const context = new TestContext();
+    const sub = `
+        <t>
+          <t t-set="c" t-value="'x' + '_' + a + '_'+ b" />
+          [<t t-esc="a" />]
+          [<t t-esc="b" />]
+          [<t t-esc="c" />]
+        </t>`;
+
+    const main = `
+        <div>
+          <t t-for="a" t-of="numbers" t-key="a">
+            <t t-for="b" t-of="letters" t-key="b">
+              <t t-call="sub" />
+            </t>
+            <span t-esc="c"/>
+          </t>
+          <span>[<t t-esc="a" />][<t t-esc="b" />][<t t-esc="c" />]</span>
+        </div>`;
+
+    context.addTemplate("sub", sub);
+    context.addTemplate("main", main);
+
+    const ctx = { numbers: [1, 2, 3], letters: ["a", "b"] };
+    const expected =
+      "<div> [1] [a] [x_1_a]  [1] [b] [x_1_b] <span></span> [2] [a] [x_2_a]  [2] [b] [x_2_b] <span></span> [3] [a] [x_3_a]  [3] [b] [x_3_b] <span></span><span>[][][]</span></div>";
+    expect(context.renderToString("main", ctx)).toBe(expected);
+  });
+
+  test("t-call with body in t-for in t-for", () => {
+    const context = new TestContext();
+    const sub = `
+        <t>
+          [<t t-esc="a" />]
+          [<t t-esc="b" />]
+          [<t t-esc="c" />]
+        </t>`;
+
+    const main = `
+        <div>
+          <t t-for="a" t-of="numbers" t-key="a">
+            <t t-for="b" t-of="letters" t-key="b">
+              <t t-call="sub" >
+                <t t-set="c" t-value="'x' + '_' + a + '_'+ b" />
+              </t>
+            </t>
+            <span t-esc="c"/>
+          </t>
+          <span>[<t t-esc="a" />][<t t-esc="b" />][<t t-esc="c" />]</span>
+        </div>`;
+
+    context.addTemplate("sub", sub);
+    context.addTemplate("main", main);
+
+    const ctx = { numbers: [1, 2, 3], letters: ["a", "b"] };
+    const expected =
+      "<div> [1] [a] [x_1_a]  [1] [b] [x_1_b] <span></span> [2] [a] [x_2_a]  [2] [b] [x_2_b] <span></span> [3] [a] [x_3_a]  [3] [b] [x_3_b] <span></span><span>[][][]</span></div>";
+    expect(context.renderToString("main", ctx)).toBe(expected);
+  });
+
+  test("throws error if invalid loop expression", () => {
+    const test = `<div><t t-for="item" t-of="abc" t-key="item"><span t-key="item"/></t></div>`;
+    expect(() => renderToString(test)).toThrow("ctx.abc is not iterable");
+  });
+
+  test("t-for with t-if inside", () => {
+    const template = `
+        <div>
+          <t t-for="{ id, text }" t-of="elems" t-key="id">
+            <span t-if="id lt 3"><t t-esc="text"/></span>
+          </t>
+        </div>`;
+    const ctx = {
+      elems: [
+        { id: 1, text: "a" },
+        { id: 2, text: "b" },
+        { id: 3, text: "c" },
+      ],
+    };
+    expect(renderToString(template, ctx)).toBe("<div><span>a</span><span>b</span></div>");
+  });
+
+  test("t-for with t-if inside (no external node)", () => {
+    const template = `
+          <t t-for="{ id, text }" t-of="elems" t-key="id">
+            <span t-if="id lt 3"><t t-esc="text"/></span>
+          </t>`;
+    const ctx = {
+      elems: [
+        { id: 1, text: "a" },
+        { id: 2, text: "b" },
+        { id: 3, text: "c" },
+      ],
+    };
+    expect(renderToString(template, ctx)).toBe("<span>a</span><span>b</span>");
+  });
+});

tests/compiler/t_foreach.test.ts

@@ -110,7 +110,7 @@ describe("t-foreach", () => {
       <t t-foreach="value" t-as="item" t-key="item_index">
         [<t t-esc="item_index"/>: <t t-esc="item"/> <t t-esc="item_value"/>]
       </t>`;
-    const expected = ` [0: a 1]  [1: b 2]  [2: c 3] `;
+    const expected = ` [0: 1 a]  [1: 2 b]  [2: 3 c] `;
     const context = {
       value: new Map([
         ["a", 1],
@@ -131,15 +131,6 @@ describe("t-foreach", () => {
     expect(renderToString(template, context)).toBe(expected);
   });
 
-  test("iterate, string param", () => {
-    const template = `
-      <t t-foreach="'abc'" t-as="item" t-key="item_index">
-        [<t t-esc="item_index"/>: <t t-esc="item"/> <t t-esc="item_value"/>]
-      </t>`;
-    const expected = ` [0: a a]  [1: b b]  [2: c c] `;
-    expect(renderToString(template)).toBe(expected);
-  });
-
   test("iterate, iterable param", () => {
     const template = `
       <t t-foreach="map.values()" t-as="item" t-key="item_index">

tests/compiler/t_set.test.ts

@@ -122,6 +122,19 @@ describe("t-set", () => {
     expect(renderToString(template, { list: ["a", "b"] })).toBe(expected);
   });
 
+  test("t-set should reuse variable if possible: for..of", () => {
+    const template = `
+        <div>
+          <t t-set="v" t-value="1"/>
+          <div t-for="elem" t-of="list" t-key="elem_index">
+              <span>v<t t-esc="v"/></span>
+              <t t-set="v" t-value="elem"/>
+          </div>
+        </div>`;
+    const expected = "<div><div><span>v1</span></div><div><span>va</span></div></div>";
+    expect(renderToString(template, { list: ["a", "b"] })).toBe(expected);
+  });
+
   test("t-set with content and sub t-esc", () => {
     const template = `
         <div>
@@ -232,6 +245,22 @@ describe("t-set", () => {
     );
   });
 
+  test("t-set outside modified in t-for", async () => {
+    const template = `
+      <div>
+        <t t-set="iter" t-value="0"/>
+        <t t-for="val" t-of="['a','b']" t-key="val">
+          <p>InLoop: <t t-esc="iter"/></p>
+          <t t-set="iter" t-value="iter + 1"/>
+        </t>
+        <p>EndLoop: <t t-esc="iter"/></p>
+      </div>
+    `;
+    expect(renderToString(template)).toBe(
+      "<div><p>InLoop: 0</p><p>InLoop: 1</p><p>EndLoop: 2</p></div>"
+    );
+  });
+
   test("t-set outside modified in t-foreach increment-after operator", async () => {
     const template = `
       <div>
@@ -248,6 +277,22 @@ describe("t-set", () => {
     );
   });
 
+  test("t-set outside modified in t-for increment-after operator", async () => {
+    const template = `
+      <div>
+        <t t-set="iter" t-value="0"/>
+        <t t-for="val" t-of="['a','b']" t-key="val">
+          <p>InLoop: <t t-esc="iter"/></p>
+          <t t-set="iter" t-value="iter++"/>
+        </t>
+        <p>EndLoop: <t t-esc="iter"/></p>
+      </div>
+    `;
+    expect(renderToString(template)).toBe(
+      "<div><p>InLoop: 0</p><p>InLoop: 0</p><p>EndLoop: 0</p></div>"
+    );
+  });
+
   test("t-set outside modified in t-foreach increment-before operator", async () => {
     const template = `
       <div>
@@ -264,6 +309,22 @@ describe("t-set", () => {
     );
   });
 
+  test("t-set outside modified in t-for increment-before operator", async () => {
+    const template = `
+      <div>
+        <t t-set="iter" t-value="0"/>
+        <t t-for="val" t-of="['a','b']" t-key="val">
+          <p>InLoop: <t t-esc="iter"/></p>
+          <t t-set="iter" t-value="++iter"/>
+        </t>
+        <p>EndLoop: <t t-esc="iter"/></p>
+      </div>
+    `;
+    expect(renderToString(template)).toBe(
+      "<div><p>InLoop: 0</p><p>InLoop: 1</p><p>EndLoop: 0</p></div>"
+    );
+  });
+
   test("t-set can't alter from within callee", async () => {
     const context = new TestContext();
     const sub = `<div><t t-esc="iter"/><t t-set="iter" t-value="'called'"/><t t-esc="iter"/></div>`;

tests/compiler/template_set.test.ts

@@ -78,62 +78,4 @@ describe("loading templates", () => {
     context.addTemplates(xml);
     expect(Object.keys(context.rawTemplates)).toEqual([]);
   });
-
-  test("getTemplate: element returned", () => {
-    const context = new TestContext({
-      getTemplate: (name) => {
-        if (name === "main") {
-          const data = `<div>Hello World!</div>`;
-          const xml = new DOMParser().parseFromString(data, "text/xml");
-          return xml.firstChild as Element;
-        }
-        return;
-      },
-    });
-    const result = context.renderToString("main");
-    expect(result).toBe("<div>Hello World!</div>");
-  });
-
-  test("getTemplate: element returned (2)", () => {
-    const context = new TestContext({
-      getTemplate: (name) => {
-        if (name === "main") {
-          const doc = new Document();
-          const div = doc.createElement("div");
-          div.append(doc.createTextNode("Hello World!"));
-          return div;
-        }
-        return;
-      },
-    });
-    const result = context.renderToString("main");
-    expect(result).toBe("<div>Hello World!</div>");
-  });
-
-  test("getTemplate: template string returned", () => {
-    const context = new TestContext({
-      getTemplate: (name) => {
-        if (name === "main") {
-          return `<div>Hello World!</div>`;
-        }
-        return;
-      },
-    });
-    const result = context.renderToString("main");
-    expect(result).toBe("<div>Hello World!</div>");
-  });
-
-  test("getTemplate: undefined returned", () => {
-    const context = new TestContext({
-      getTemplate: () => {},
-    });
-    const data = `<?xml version="1.0" encoding="UTF-8"?>
-    <templates id="template" xml:space="preserve">
-      <div t-name="main">Hello World!</div>
-    </templates>`;
-    const xml = new DOMParser().parseFromString(data, "text/xml");
-    context.addTemplates(xml);
-    const result = context.renderToString("main");
-    expect(result).toBe("<div>Hello World!</div>");
-  });
 });

tests/compiler/validation.test.ts

@@ -11,8 +11,8 @@ describe("basic validation", () => {
     expect(() => context.getTemplate("invalidname")).toThrow("Missing template");
   });
 
-  test("cannot add a different template with the same name in dev mode", () => {
-    const context = new TemplateSet({ dev: true });
+  test("cannot add a different template with the same name", () => {
+    const context = new TemplateSet();
     context.addTemplate("test", `<t/>`);
     // Same template with the same name is fine
     expect(() => context.addTemplate("test", "<t/>")).not.toThrow();
@@ -20,13 +20,6 @@ describe("basic validation", () => {
     expect(() => context.addTemplate("test", "<div/>")).toThrow("already defined");
   });
 
-  test("adding different template with same name outside dev mode silently ignores it", () => {
-    const context = new TemplateSet({ dev: false });
-    context.addTemplate("test", `<t/>`);
-    expect(() => context.addTemplate("test", "<div/>")).not.toThrow();
-    expect(context.rawTemplates.test).toBe("<t/>");
-  });
-
   test("invalid xml", () => {
     const template = "<div>";
     expect(() => snapshotTemplate(template)).toThrow("Invalid XML in template");

tests/components/__snapshots__/basics.test.ts.snap

@@ -440,7 +440,7 @@ exports[`basics higher order components parent and child 2`] = `
   const comp2 = app.createComponent(\`ChildB\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['props'].child==='a') {
       b2 = comp1({}, key + \`__1\`, node, this, null);
     } else {
@@ -492,7 +492,7 @@ exports[`basics list of two sub components inside other nodes 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].blips);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`blip\`] = k_block2[i1];
+      ctx[\`blip\`] = v_block2[i1];
       const key1 = ctx['blip'].id;
       const b4 = comp1({}, key + \`__1__\${key1}\`, node, this, null);
       const b5 = comp2({}, key + \`__2__\${key1}\`, node, this, null);
@@ -738,7 +738,7 @@ exports[`basics sub components between t-ifs 1`] = `
   let block5 = createBlock(\`<span>test</span>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4, b5;
+    let b2,b3,b4,b5;
     if (ctx['state'].flag) {
       b2 = block2();
     } else {
@@ -776,7 +776,7 @@ exports[`basics t-elif works with t-component 1`] = `
   let block2 = createBlock(\`<div>somediv</div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].flag) {
       b2 = block2();
     } else if (!ctx['state'].flag) {
@@ -810,7 +810,7 @@ exports[`basics t-else with empty string works with t-component 1`] = `
   let block2 = createBlock(\`<div>somediv</div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].flag) {
       b2 = block2();
     } else {
@@ -844,7 +844,7 @@ exports[`basics t-else works with t-component 1`] = `
   let block2 = createBlock(\`<div>somediv</div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].flag) {
       b2 = block2();
     } else {
@@ -909,7 +909,7 @@ exports[`basics t-key on a component with t-if, and a sibling component 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (false) {
       const tKey_1 = 'str';
       b2 = toggler(tKey_1, comp1({}, tKey_1 + key + \`__1\`, node, this, null));
@@ -1084,7 +1084,7 @@ exports[`basics updating a component with t-foreach as root 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       const key1 = ctx['item'];
       c_block1[i1] = withKey(text(ctx['item']), key1);
     }
@@ -1135,7 +1135,7 @@ exports[`basics widget after a t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(Array(2));;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`elem\`] = k_block2[i1];
+      ctx[\`elem\`] = v_block2[i1];
       ctx[\`elem_index\`] = i1;
       const key1 = ctx['elem_index'];
       c_block2[i1] = withKey(text(\`txt\`), key1);
@@ -1248,7 +1248,7 @@ exports[`support svg components add proper namespace to svg 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   const comp1 = app.createComponent(\`GComp\`, true, false, false, []);
   
-  let block1 = createBlock(\`<svg xmlns=\\"http://www.w3.org/2000/svg\\"><block-child-0 xmlns=\\"\\"/></svg>\`);
+  let block1 = createBlock(\`<svg block-ns=\\"http://www.w3.org/2000/svg\\"><block-child-0/></svg>\`);
   
   return function template(ctx, node, key = \\"\\") {
     const b2 = comp1({}, key + \`__1\`, node, this, null);
@@ -1262,7 +1262,7 @@ exports[`support svg components add proper namespace to svg 2`] = `
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   
-  let block1 = createBlock(\`<g xmlns=\\"http://www.w3.org/2000/svg\\"><circle cx=\\"50\\" cy=\\"50\\" r=\\"4\\" stroke=\\"green\\" stroke-width=\\"1\\" fill=\\"yellow\\"/></g>\`);
+  let block1 = createBlock(\`<g block-ns=\\"http://www.w3.org/2000/svg\\"><circle cx=\\"50\\" cy=\\"50\\" r=\\"4\\" stroke=\\"green\\" stroke-width=\\"1\\" fill=\\"yellow\\"/></g>\`);
   
   return function template(ctx, node, key = \\"\\") {
     return block1();
@@ -1282,7 +1282,7 @@ exports[`t-out in components can render list of t-out  1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].items);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       const b4 = text(ctx['item']);
       const b5 = safeOutput(ctx['item']);

tests/components/__snapshots__/concurrency.test.ts.snap

@@ -13,7 +13,7 @@ exports[`Cascading renders after microtaskTick 1`] = `
     ctx = Object.create(ctx);
     const [k_block4, v_block4, l_block4, c_block4] = prepareList(ctx['state']);;
     for (let i1 = 0; i1 < l_block4; i1++) {
-      ctx[\`elem\`] = k_block4[i1];
+      ctx[\`elem\`] = v_block4[i1];
       const key1 = ctx['elem'].id;
       c_block4[i1] = withKey(text(ctx['elem'].id), key1);
     }
@@ -34,7 +34,7 @@ exports[`Cascading renders after microtaskTick 2`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['state']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`elem\`] = k_block1[i1];
+      ctx[\`elem\`] = v_block1[i1];
       const key1 = ctx['elem'].id;
       c_block1[i1] = withKey(comp1({id: ctx['elem'].id}, key + \`__1__\${key1}\`, node, this, null), key1);
     }
@@ -61,7 +61,7 @@ exports[`another scenario with delayed rendering 1`] = `
   const comp1 = app.createComponent(\`B\`, true, false, false, [\\"value\\"]);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`A\`);
     if (ctx['state'].value<15) {
       b3 = comp1({value: ctx['state'].value}, key + \`__1\`, node, this, null);
@@ -184,7 +184,7 @@ exports[`changing state before first render does not trigger a render (with pare
 }"
 `;
 
-exports[`changing state before first render does not trigger a render (with parent) 3`] = `
+exports[`changing state before first render does not trigger a render (with parent) 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -244,7 +244,7 @@ exports[`components are not destroyed between animation frame 1`] = `
   const comp1 = app.createComponent(\`B\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`A\`);
     if (ctx['state'].flag) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -254,7 +254,7 @@ exports[`components are not destroyed between animation frame 1`] = `
 }"
 `;
 
-exports[`components are not destroyed between animation frame 3`] = `
+exports[`components are not destroyed between animation frame 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -268,7 +268,7 @@ exports[`components are not destroyed between animation frame 3`] = `
 }"
 `;
 
-exports[`components are not destroyed between animation frame 5`] = `
+exports[`components are not destroyed between animation frame 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -748,7 +748,7 @@ exports[`concurrent renderings scenario 10 2`] = `
 }"
 `;
 
-exports[`concurrent renderings scenario 10 4`] = `
+exports[`concurrent renderings scenario 10 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -831,7 +831,7 @@ exports[`concurrent renderings scenario 13 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = comp1({}, key + \`__1\`, node, this, null);
     if (ctx['state'].bool) {
       b3 = comp2({}, key + \`__2\`, node, this, null);
@@ -978,7 +978,7 @@ exports[`concurrent renderings scenario 16 3`] = `
   const comp1 = app.createComponent(\`D\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4, b5, b6, b7, b8;
+    let b2,b3,b4,b5,b6,b7,b8;
     b2 = text(ctx['props'].fromA);
     b3 = text(\`:\`);
     b4 = text(ctx['props'].fromB);
@@ -993,7 +993,7 @@ exports[`concurrent renderings scenario 16 3`] = `
 }"
 `;
 
-exports[`concurrent renderings scenario 16 6`] = `
+exports[`concurrent renderings scenario 16 4`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1012,7 +1012,7 @@ exports[`creating two async components, scenario 1 1`] = `
   const comp2 = app.createComponent(\`ChildB\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].flagA) {
       b2 = comp1({}, key + \`__1\`, node, this, null);
     }
@@ -1024,7 +1024,7 @@ exports[`creating two async components, scenario 1 1`] = `
 }"
 `;
 
-exports[`creating two async components, scenario 1 3`] = `
+exports[`creating two async components, scenario 1 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1038,7 +1038,7 @@ exports[`creating two async components, scenario 1 3`] = `
 }"
 `;
 
-exports[`creating two async components, scenario 1 5`] = `
+exports[`creating two async components, scenario 1 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1061,7 +1061,7 @@ exports[`creating two async components, scenario 2 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = comp1({val: ctx['state'].valA}, key + \`__1\`, node, this, null);
     if (ctx['state'].flagB) {
       b3 = comp2({val: ctx['state'].valB}, key + \`__2\`, node, this, null);
@@ -1085,7 +1085,7 @@ exports[`creating two async components, scenario 2 2`] = `
 }"
 `;
 
-exports[`creating two async components, scenario 2 5`] = `
+exports[`creating two async components, scenario 2 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1109,7 +1109,7 @@ exports[`creating two async components, scenario 3 (patching in the same frame)
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = comp1({val: ctx['state'].valA}, key + \`__1\`, node, this, null);
     if (ctx['state'].flagB) {
       b3 = comp2({val: ctx['state'].valB}, key + \`__2\`, node, this, null);
@@ -1133,7 +1133,7 @@ exports[`creating two async components, scenario 3 (patching in the same frame)
 }"
 `;
 
-exports[`creating two async components, scenario 3 (patching in the same frame) 5`] = `
+exports[`creating two async components, scenario 3 (patching in the same frame) 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1308,7 +1308,7 @@ exports[`delayed render does not go through when t-component value changed 2`] =
 }"
 `;
 
-exports[`delayed render does not go through when t-component value changed 4`] = `
+exports[`delayed render does not go through when t-component value changed 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1421,7 +1421,7 @@ exports[`delayed rendering, destruction, stuff happens 2`] = `
   const comp1 = app.createComponent(\`C\`, true, false, false, [\\"value\\"]);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`B\`);
     if (ctx['state'].hasChild) {
       b3 = comp1({value: ctx['state'].someValue+ctx['props'].value}, key + \`__1\`, node, this, null);
@@ -1514,7 +1514,7 @@ exports[`delayed rendering, reusing fiber then component is destroyed and  stuff
   const comp1 = app.createComponent(\`B\`, true, false, false, [\\"value\\"]);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`A\`);
     if (ctx['state'].value<15) {
       b3 = comp1({value: ctx['state'].value}, key + \`__1\`, node, this, null);
@@ -1572,7 +1572,7 @@ exports[`delayed rendering, then component is destroyed and  stuff 2`] = `
   const comp1 = app.createComponent(\`C\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(ctx['props'].value);
     if (ctx['props'].value<10) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -1605,7 +1605,7 @@ exports[`destroyed component causes other soon to be destroyed component to rere
   const comp2 = app.createComponent(\`C\`, true, false, false, [\\"value\\"]);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\` A \`);
     if (ctx['state'].flag) {
       const b4 = comp1({value: ctx['state'].valueB}, key + \`__1\`, node, this, null);
@@ -1617,7 +1617,7 @@ exports[`destroyed component causes other soon to be destroyed component to rere
 }"
 `;
 
-exports[`destroyed component causes other soon to be destroyed component to rerender, weird stuff happens 3`] = `
+exports[`destroyed component causes other soon to be destroyed component to rerender, weird stuff happens 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1628,7 +1628,7 @@ exports[`destroyed component causes other soon to be destroyed component to rere
 }"
 `;
 
-exports[`destroyed component causes other soon to be destroyed component to rerender, weird stuff happens 4`] = `
+exports[`destroyed component causes other soon to be destroyed component to rerender, weird stuff happens 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1646,7 +1646,7 @@ exports[`destroying/recreating a subcomponent, other scenario 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`parent\`);
     if (ctx['state'].hasChild) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -1656,7 +1656,7 @@ exports[`destroying/recreating a subcomponent, other scenario 1`] = `
 }"
 `;
 
-exports[`destroying/recreating a subcomponent, other scenario 3`] = `
+exports[`destroying/recreating a subcomponent, other scenario 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1685,7 +1685,7 @@ exports[`destroying/recreating a subwidget with different props (if start is not
 }"
 `;
 
-exports[`destroying/recreating a subwidget with different props (if start is not over) 3`] = `
+exports[`destroying/recreating a subwidget with different props (if start is not over) 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1787,7 +1787,7 @@ exports[`rendering component again in next microtick 1`] = `
 }"
 `;
 
-exports[`rendering component again in next microtick 3`] = `
+exports[`rendering component again in next microtick 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -1846,7 +1846,7 @@ exports[`renderings, destruction, patch, stuff, ... yet another variation 2`] =
   const comp1 = app.createComponent(\`C\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(\`B\`);
     if (ctx['props'].value===33) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -1901,7 +1901,7 @@ exports[`t-foreach with dynamic async component 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['list']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`arr\`] = k_block1[i1];
+      ctx[\`arr\`] = v_block1[i1];
       ctx[\`arr_index\`] = i1;
       const key1 = ctx['arr_index'];
       let b3;

tests/components/__snapshots__/error_handling.test.ts.snap

@@ -103,7 +103,7 @@ exports[`basics simple catchError 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['error']) {
       b2 = text(\`Error\`);
     } else {
@@ -201,7 +201,7 @@ exports[`can catch errors an error in onWillDestroy 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(ctx['state'].value);
     if (ctx['state'].hasChild) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -231,7 +231,7 @@ exports[`can catch errors an error in onWillDestroy, variation 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     b2 = text(ctx['state'].value);
     if (ctx['state'].hasChild) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -241,7 +241,7 @@ exports[`can catch errors an error in onWillDestroy, variation 1`] = `
 }"
 `;
 
-exports[`can catch errors an error in onWillDestroy, variation 3`] = `
+exports[`can catch errors an error in onWillDestroy, variation 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -295,7 +295,7 @@ exports[`can catch errors can catch an error in a component render function 2`]
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -350,7 +350,7 @@ exports[`can catch errors can catch an error in the constructor call of a compon
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -394,7 +394,7 @@ exports[`can catch errors can catch an error in the constructor call of a compon
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -474,7 +474,7 @@ exports[`can catch errors can catch an error in the initial call of a component
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -532,7 +532,7 @@ exports[`can catch errors can catch an error in the initial call of a component
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -593,7 +593,7 @@ exports[`can catch errors can catch an error in the mounted call (in child of ch
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -626,7 +626,7 @@ exports[`can catch errors can catch an error in the mounted call (in root compon
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -680,7 +680,7 @@ exports[`can catch errors can catch an error in the mounted call 2`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -735,7 +735,7 @@ exports[`can catch errors can catch an error in the willPatch call 2`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -790,7 +790,7 @@ exports[`can catch errors can catch an error in the willStart call 2`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -847,7 +847,7 @@ exports[`can catch errors can catch an error origination from a child's willStar
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -893,7 +893,7 @@ exports[`can catch errors catchError in catchError 1`] = `
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['error']) {
       b2 = text(\`Error\`);
     } else {
@@ -950,7 +950,7 @@ exports[`can catch errors catching error, rethrow, render parent  -- a main comp
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(Object.values(ctx['state'].cps));;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`cp\`] = k_block1[i1];
+      ctx[\`cp\`] = v_block1[i1];
       const key1 = ctx['cp'].id;
       const v1 = ctx['this'];
       const v2 = ctx['cp'];
@@ -1029,7 +1029,7 @@ exports[`can catch errors catching in child makes parent render 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(Object.entries(ctx['this'].elements));;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`elem\`] = k_block1[i1];
+      ctx[\`elem\`] = v_block1[i1];
       const key1 = ctx['elem'][0];
       const v1 = ctx['this'];
       const v2 = ctx['elem'];
@@ -1123,7 +1123,7 @@ exports[`can catch errors error in mounted on a component with a sibling (proper
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].error) {
       b2 = text(\`Error handled\`);
     } else {
@@ -1167,7 +1167,7 @@ exports[`can catch errors onError in class inheritance is called if rethrown 2`]
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (!ctx['state'].error) {
       b2 = text(ctx['this'].will.crash);
     } else {
@@ -1198,7 +1198,7 @@ exports[`can catch errors onError in class inheritance is not called if no rethr
   let block1 = createBlock(\`<div><block-child-0/><block-child-1/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (!ctx['state'].error) {
       b2 = text(ctx['this'].will.crash);
     } else {

tests/components/__snapshots__/event_handling.test.ts.snap

@@ -117,7 +117,7 @@ exports[`event handling objects from scope are properly captured by t-on 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       const v1 = ctx['onClick'];
       const v2 = ctx['item'];
@@ -158,7 +158,7 @@ exports[`event handling t-on with handler bound to dynamic argument on a t-forea
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = ctx['item'];
       const v1 = ctx['onClick'];
       const v2 = ctx['item'];

tests/components/__snapshots__/higher_order_component.test.ts.snap

@@ -34,7 +34,7 @@ exports[`basics can select a sub widget  1`] = `
   const comp2 = app.createComponent(\`OtherChild\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['env'].options.flag) {
       b2 = comp1({}, key + \`__1\`, node, this, null);
     }
@@ -80,7 +80,7 @@ exports[`basics can select a sub widget, part 2 1`] = `
   const comp2 = app.createComponent(\`OtherChild\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].flag) {
       b2 = comp1({}, key + \`__1\`, node, this, null);
     }

tests/components/__snapshots__/lifecycle.test.ts.snap

@@ -54,7 +54,7 @@ exports[`lifecycle hooks component semantics 3`] = `
   let block1 = createBlock(\`<div>C<block-child-0/><block-child-1/><block-child-2/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4;
+    let b2,b3,b4;
     b2 = comp1({}, key + \`__1\`, node, this, null);
     if (ctx['state'].flag) {
       b3 = comp2({}, key + \`__2\`, node, this, null);
@@ -92,7 +92,7 @@ exports[`lifecycle hooks component semantics 5`] = `
 }"
 `;
 
-exports[`lifecycle hooks component semantics 7`] = `
+exports[`lifecycle hooks component semantics 6`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -174,7 +174,7 @@ exports[`lifecycle hooks destroy new children before being mountged 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, false, false, []);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3, b4;
+    let b2,b3,b4;
     b2 = text(\`before\`);
     if (ctx['state'].flag) {
       b3 = comp1({}, key + \`__1\`, node, this, null);
@@ -185,7 +185,7 @@ exports[`lifecycle hooks destroy new children before being mountged 1`] = `
 }"
 `;
 
-exports[`lifecycle hooks destroy new children before being mountged 3`] = `
+exports[`lifecycle hooks destroy new children before being mountged 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -291,7 +291,7 @@ exports[`lifecycle hooks lifecycle semantics, part 2 1`] = `
 }"
 `;
 
-exports[`lifecycle hooks lifecycle semantics, part 2 3`] = `
+exports[`lifecycle hooks lifecycle semantics, part 2 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -303,7 +303,7 @@ exports[`lifecycle hooks lifecycle semantics, part 2 3`] = `
 }"
 `;
 
-exports[`lifecycle hooks lifecycle semantics, part 2 4`] = `
+exports[`lifecycle hooks lifecycle semantics, part 2 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -348,7 +348,7 @@ exports[`lifecycle hooks lifecycle semantics, part 4 1`] = `
 }"
 `;
 
-exports[`lifecycle hooks lifecycle semantics, part 4 3`] = `
+exports[`lifecycle hooks lifecycle semantics, part 4 2`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -360,7 +360,7 @@ exports[`lifecycle hooks lifecycle semantics, part 4 3`] = `
 }"
 `;
 
-exports[`lifecycle hooks lifecycle semantics, part 4 4`] = `
+exports[`lifecycle hooks lifecycle semantics, part 4 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
@@ -826,7 +826,7 @@ exports[`lifecycle hooks willStart, mounted on subwidget rendered after main is
   let block3 = createBlock(\`<div/>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].ok) {
       b2 = comp1({}, key + \`__1\`, node, this, null);
     } else {

tests/components/__snapshots__/props.test.ts.snap

@@ -11,7 +11,7 @@ exports[`.alike suffix in a list 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['state'].elems);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`elem\`] = k_block1[i1];
+      ctx[\`elem\`] = v_block1[i1];
       const key1 = ctx['elem'].id;
       const v1 = ctx['this'];
       const v2 = ctx['elem'];
@@ -106,7 +106,7 @@ exports[`basics arrow functions as prop correctly capture their scope 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       const key1 = ctx['item'].val;
       const v1 = ctx['onClick'];
       const v2 = ctx['item'];

tests/components/__snapshots__/props_validation.test.ts.snap

@@ -39,7 +39,7 @@ exports[`default props can set default boolean values 2`] = `
   let block1 = createBlock(\`<span><block-child-0/><block-child-1/></span>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['props'].p) {
       b2 = text(\`hey\`);
     }

tests/components/__snapshots__/refs.test.ts.snap

@@ -23,7 +23,7 @@ exports[`refs can use 2 refs with same name in a t-if/t-else situation 1`] = `
   let block3 = createBlock(\`<span block-ref=\\"0\\"/>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].value) {
       let ref1 = (el) => this.__owl__.setRef((\`coucou\`), el);
       b2 = block2([ref1]);

tests/components/__snapshots__/slots.test.ts.snap

@@ -509,7 +509,7 @@ exports[`slots default slot with slot scope: shorthand syntax 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, true, false, []);
   
   function slot1(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['slotScope'].bool) {
       b2 = text(\`some text\`);
     } else {
@@ -633,7 +633,7 @@ exports[`slots dynamic slot in multiple locations 2`] = `
   let block2 = createBlock(\`<p><block-child-0/></p>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b4;
+    let b2,b4;
     if (ctx['props'].location===1) {
       const slot1 = ('coffee');
       const b3 = toggler(slot1, callSlot(ctx, node, key + \`__1\`, slot1, true, {}));
@@ -1066,45 +1066,6 @@ exports[`slots multiple slots containing components 3`] = `
 }"
 `;
 
-exports[`slots named slot inside named slot in t-component 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { capture, markRaw } = helpers;
-  const comp1 = app.createComponent(null, false, true, false, []);
-  const comp2 = app.createComponent(\`Child\`, true, true, false, []);
-  
-  function slot1(ctx, node, key = \\"\\") {
-    const b2 = text(\` outer \`);
-    const ctx2 = capture(ctx);
-    const Comp1 = ctx['Child'];
-    const b4 = toggler(Comp1, comp1({slots: markRaw({'brol': {__render: slot2.bind(this), __ctx: ctx2}})}, (Comp1).name + key + \`__1\`, node, this, Comp1));
-    return multi([b2, b4]);
-  }
-  
-  function slot2(ctx, node, key = \\"\\") {
-    return text(ctx['value']);
-  }
-  
-  return function template(ctx, node, key = \\"\\") {
-    const ctx1 = capture(ctx);
-    return comp2({slots: markRaw({'brol': {__render: slot1.bind(this), __ctx: ctx1}})}, key + \`__2\`, node, this, null);
-  }
-}"
-`;
-
-exports[`slots named slot inside named slot in t-component 2`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { callSlot } = helpers;
-  
-  return function template(ctx, node, key = \\"\\") {
-    return callSlot(ctx, node, key, 'brol', false, {});
-  }
-}"
-`;
-
 exports[`slots named slot inside slot 1`] = `
 "function anonymous(app, bdom, helpers
 ) {
@@ -1501,7 +1462,7 @@ exports[`slots simple default slot with params 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, true, false, []);
   
   function slot1(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['slotScope'].bool) {
       b2 = text(\`some text\`);
     } else {
@@ -1597,7 +1558,7 @@ exports[`slots simple dynamic slot with slot scope 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, true, false, []);
   
   function slot1(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['slotScope'].bool) {
       b2 = text(\`some text\`);
     } else {
@@ -1704,7 +1665,7 @@ exports[`slots simple slot with slot scope 1`] = `
   const comp1 = app.createComponent(\`Child\`, true, true, false, []);
   
   function slot1(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['slotScope'].bool) {
       b2 = text(\`some text\`);
     } else {
@@ -2121,7 +2082,7 @@ exports[`slots slot in multiple locations 2`] = `
   let block2 = createBlock(\`<p><block-child-0/></p>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b4;
+    let b2,b4;
     if (ctx['props'].location===1) {
       const b3 = callSlot(ctx, node, key, 'default', false, {});
       b2 = block2([], [b3]);
@@ -2179,7 +2140,7 @@ exports[`slots slot in t-foreach locations 2`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['props'].list);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`elem\`] = k_block1[i1];
+      ctx[\`elem\`] = v_block1[i1];
       ctx[\`elem_index\`] = i1;
       const key1 = ctx['elem_index'];
       let txt1 = ctx['elem'];
@@ -2469,7 +2430,7 @@ exports[`slots slots are rendered with proper context, part 2 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].users);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`user\`] = k_block2[i1];
+      ctx[\`user\`] = v_block2[i1];
       const key1 = ctx['user'].id;
       const ctx1 = capture(ctx);
       const b7 = comp1({to: '/user/'+ctx['user'].id,slots: markRaw({'default': {__render: slot1.bind(this), __ctx: ctx1}})}, key + \`__1__\${key1}\`, node, this, null);
@@ -2517,7 +2478,7 @@ exports[`slots slots are rendered with proper context, part 3 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].users);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`user\`] = k_block2[i1];
+      ctx[\`user\`] = v_block2[i1];
       const key1 = ctx['user'].id;
       setContextValue(ctx, \\"userdescr\\", 'User '+ctx['user'].name);
       const ctx1 = capture(ctx);
@@ -2664,7 +2625,7 @@ exports[`slots slots in t-foreach and re-rendering 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(Array(2));;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`n\`] = k_block2[i1];
+      ctx[\`n\`] = v_block2[i1];
       ctx[\`n_index\`] = i1;
       const key1 = ctx['n_index'];
       const ctx1 = capture(ctx);
@@ -2713,14 +2674,14 @@ exports[`slots slots in t-foreach in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['tree']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`node1\`] = k_block2[i1];
+      ctx[\`node1\`] = v_block2[i1];
       const key1 = ctx['node1'].key;
       let txt1 = ctx['node1'].value;
       const b4 = block4([txt1]);
       ctx = Object.create(ctx);
       const [k_block6, v_block6, l_block6, c_block6] = prepareList(ctx['node1'].nodes);;
       for (let i2 = 0; i2 < l_block6; i2++) {
-        ctx[\`node2\`] = k_block6[i2];
+        ctx[\`node2\`] = v_block6[i2];
         const key2 = ctx['node2'].key;
         const ctx1 = capture(ctx);
         c_block6[i2] = withKey(comp1({slots: markRaw({'default': {__render: slot1.bind(this), __ctx: ctx1}})}, key + \`__1__\${key1}__\${key2}\`, node, this, null), key2);
@@ -2770,7 +2731,7 @@ exports[`slots slots in t-foreach with t-set and re-rendering 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(Array(2));;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`n\`] = k_block2[i1];
+      ctx[\`n\`] = v_block2[i1];
       ctx[\`n_index\`] = i1;
       const key1 = ctx['n_index'];
       setContextValue(ctx, \\"dummy\\", ctx['n_index']);
@@ -2920,13 +2881,13 @@ exports[`slots t-slot in recursive templates 1`] = `
     ctx = Object.create(ctx);
     const [k_block3, v_block3, l_block3, c_block3] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block3; i1++) {
-      ctx[\`item\`] = k_block3[i1];
+      ctx[\`item\`] = v_block3[i1];
       ctx[\`item_first\`] = i1 === 0;
-      ctx[\`item_last\`] = i1 === k_block3.length - 1;
+      ctx[\`item_last\`] = i1 === v_block3.length - 1;
       ctx[\`item_index\`] = i1;
-      ctx[\`item_value\`] = v_block3[i1];
+      ctx[\`item_value\`] = k_block3[i1];
       const key1 = ctx['item'].name;
-      let b5, b6;
+      let b5,b6;
       if (!ctx['item'].children.length) {
         b5 = text(ctx['item'].name);
       } else {

tests/components/__snapshots__/style_class.test.ts.snap

@@ -166,7 +166,7 @@ exports[`style and class handling class on sub component, which is switched to a
   const comp2 = app.createComponent(\`ChildB\`, true, false, false, [\\"class\\"]);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['props'].child==='a') {
       b2 = comp1({class: ctx['props'].class}, key + \`__1\`, node, this, null);
     } else {

tests/components/__snapshots__/t_call.test.ts.snap

@@ -10,8 +10,8 @@ exports[`t-call dynamic t-call 1`] = `
   return function template(ctx, node, key = \\"\\") {
     ctx = Object.create(ctx);
     ctx[isBoundary] = 1;
-    const b2 = text(\` owl \`);
-    ctx[zero] = b2;
+    const b1 = text(\` owl \`);
+    ctx[zero] = b1;
     const template1 = (ctx['current'].template);
     return call(this, template1, ctx, node, key + \`__1\`);
   }
@@ -364,7 +364,7 @@ exports[`t-call sub components in two t-calls 1`] = `
   let block3 = createBlock(\`<div><block-child-0/></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].val===1) {
       b2 = callTemplate_1.call(this, ctx, node, key + \`__1\`);
     } else {
@@ -415,11 +415,11 @@ exports[`t-call t-call in t-foreach and children component 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(['a','b','c']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       ctx[\`val_first\`] = i1 === 0;
-      ctx[\`val_last\`] = i1 === k_block2.length - 1;
+      ctx[\`val_last\`] = i1 === v_block2.length - 1;
       ctx[\`val_index\`] = i1;
-      ctx[\`val_value\`] = v_block2[i1];
+      ctx[\`val_value\`] = k_block2[i1];
       const key1 = ctx['val'];
       c_block2[i1] = withKey(callTemplate_1.call(this, ctx, node, key + \`__1__\${key1}\`), key1);
     }

tests/components/__snapshots__/t_component.test.ts.snap

@@ -180,7 +180,7 @@ exports[`t-component switching dynamic component 2`] = `
 }"
 `;
 
-exports[`t-component switching dynamic component 4`] = `
+exports[`t-component switching dynamic component 3`] = `
 "function anonymous(app, bdom, helpers
 ) {
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;

tests/components/__snapshots__/t_for.test.ts.snap

@@ -0,0 +1,493 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`list of components components in a node in a t-for  1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"item\\"]);
+  
+  let block1 = createBlock(\`<div><ul><block-child-0/></ul></div>\`);
+  let block3 = createBlock(\`<li><block-child-0/></li>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['item'] of ctx['items']) {
+      const key1 = 'li_'+ctx['item'];
+      const b4 = comp1({item: ctx['item']}, key + \`__1__\${key1}\`, node, this, null);
+      c_block2[i1] = withKey(block3([], [b4]), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components components in a node in a t-for  2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<div><block-text-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['props'].item;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components crash on duplicate key in dev mode 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { OwlError, withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, []);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const keys1 = new Set();
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of [1,2]) {
+      const key1 = 'child';
+      if (keys1.has(String(key1))) { throw new OwlError(\`Got duplicate key in t-for: \${key1}\`)}
+      keys1.add(String(key1));
+      const props1 = {};
+      helpers.validateProps(\`Child\`, props1, this);
+      c_block1[i1] = withKey(comp1(props1, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`list of components crash on duplicate key in dev mode 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  return function template(ctx, node, key = \\"\\") {
+    return text(\`\`);
+  }
+}"
+`;
+
+exports[`list of components crash when using object as keys that serialize to the same string 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { OwlError, withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, []);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const keys1 = new Set();
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['item'] of [{},{}]) {
+      const key1 = ctx['item'];
+      if (keys1.has(String(key1))) { throw new OwlError(\`Got duplicate key in t-for: \${key1}\`)}
+      keys1.add(String(key1));
+      const props1 = {};
+      helpers.validateProps(\`Child\`, props1, this);
+      c_block1[i1] = withKey(comp1(props1, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`list of components crash when using object as keys that serialize to the same string 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  return function template(ctx, node, key = \\"\\") {
+    return text(\`\`);
+  }
+}"
+`;
+
+exports[`list of components list of sub components inside other nodes 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`SubComponent\`, true, false, false, []);
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['blip'] of ctx['state'].blips) {
+      const key1 = ctx['blip'].id;
+      const b4 = comp1({}, key + \`__1__\${key1}\`, node, this, null);
+      c_block2[i1] = withKey(block3([], [b4]), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components list of sub components inside other nodes 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<span>asdf</span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    return block1();
+  }
+}"
+`;
+
+exports[`list of components order is correct when slots are not of same type 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { capture, markRaw } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, true, false, []);
+  
+  let block2 = createBlock(\`<div>A</div>\`);
+  
+  function slot1(ctx, node, key = \\"\\") {
+    let b2;
+    if (!ctx['state'].active) {
+      b2 = block2();
+    }
+    return multi([b2]);
+  }
+  
+  function slot2(ctx, node, key = \\"\\") {
+    return text(\`B\`);
+  }
+  
+  function slot3(ctx, node, key = \\"\\") {
+    return text(\`C\`);
+  }
+  
+  return function template(ctx, node, key = \\"\\") {
+    const ctx1 = capture(ctx);
+    return comp1({slots: markRaw({'a': {__render: slot1.bind(this), __ctx: ctx1, active: !ctx['state'].active}, 'b': {__render: slot2.bind(this), __ctx: ctx1, active: true}, 'c': {__render: slot3.bind(this), __ctx: ctx1, active: ctx['state'].active}})}, key + \`__1\`, node, this, null);
+  }
+}"
+`;
+
+exports[`list of components order is correct when slots are not of same type 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { callSlot, withKey } = helpers;
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['slotName'] of ctx['slotNames']) {
+      const key1 = ctx['slotName'];
+      const slot1 = (ctx['slotName']);
+      c_block1[i1] = withKey(toggler(slot1, callSlot(ctx, node, key1 + \`__1__\${key1}\`, slot1, true, {})), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`list of components reconciliation alg works for t-for in t-for 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"blip\\"]);
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['section'] of ctx['state'].s) {
+      const key1 = ctx['section'];
+      ctx = Object.create(ctx);
+      const c_block3 = [];
+      let i2 = 0;
+      for (ctx['blip'] of ctx['section'].blips) {
+        const key2 = ctx['blip'];
+        c_block3[i2] = withKey(comp1({blip: ctx['blip']}, key + \`__1__\${key1}__\${key2}\`, node, this, null), key2);
+        i2++;
+      }
+      ctx = ctx.__proto__;
+      c_block2[i1] = withKey(list(c_block3), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components reconciliation alg works for t-for in t-for 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<div><block-text-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['props'].blip;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components reconciliation alg works for t-for in t-for, 2 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"row\\",\\"col\\"]);
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<p><block-child-0/></p>\`);
+  let block5 = createBlock(\`<p><block-child-0/></p>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['row'] of ctx['state'].rows) {
+      const key1 = ctx['row'];
+      ctx = Object.create(ctx);
+      const c_block4 = [];
+      let i2 = 0;
+      for (ctx['col'] of ctx['state'].cols) {
+        const key2 = ctx['col'];
+        const b6 = comp1({row: ctx['row'],col: ctx['col']}, key + \`__1__\${key1}__\${key2}\`, node, this, null);
+        c_block4[i2] = withKey(block5([], [b6]), key2);
+        i2++;
+      }
+      ctx = ctx.__proto__;
+      const b4 = list(c_block4);
+      c_block2[i1] = withKey(block3([], [b4]), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components reconciliation alg works for t-for in t-for, 2 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<div><block-text-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['props'].row+'_'+ctx['props'].col;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components simple list 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"value\\"]);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block1 = [];
+    let i1 = 0;
+    for (ctx['elem'] of ctx['state'].elems) {
+      const key1 = ctx['elem'].id;
+      c_block1[i1] = withKey(comp1({value: ctx['elem'].value}, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    return list(c_block1);
+  }
+}"
+`;
+
+exports[`list of components simple list 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<span><block-text-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['props'].value;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components sub components rendered in a loop 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"n\\"]);
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['number'] of ctx['state'].numbers) {
+      const key1 = ctx['number'];
+      c_block2[i1] = withKey(comp1({n: ctx['number']}, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components sub components rendered in a loop 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<p><block-text-0/></p>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['props'].n;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components sub components with some state rendered in a loop 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, []);
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['number'] of ctx['state'].numbers) {
+      const key1 = ctx['number'];
+      c_block2[i1] = withKey(comp1({}, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components sub components with some state rendered in a loop 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<p><block-text-0/></p>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['state'].n;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components switch component position 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"key\\"]);
+  
+  let block1 = createBlock(\`<span><block-child-0/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['c'] of ctx['clist']) {
+      const key1 = ctx['c'];
+      c_block2[i1] = withKey(comp1({key: ctx['c']}, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components switch component position 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<div><block-text-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['props'].key;
+    return block1([txt1]);
+  }
+}"
+`;
+
+exports[`list of components t-for with t-component, and update 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  let { withKey } = helpers;
+  const comp1 = app.createComponent(\`Child\`, true, false, false, [\\"val\\"]);
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const c_block2 = [];
+    let i1 = 0;
+    for (ctx['n'] of [0,1]) {
+      const key1 = ctx['n'];
+      c_block2[i1] = withKey(comp1({val: ctx['n']}, key + \`__1__\${key1}\`, node, this, null), key1);
+      i1++;
+    }
+    const b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`list of components t-for with t-component, and update 2`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
+  
+  let block1 = createBlock(\`<span><block-text-0/><block-text-1/></span>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let txt1 = ctx['state'].val;
+    let txt2 = ctx['props'].val;
+    return block1([txt1, txt2]);
+  }
+}"
+`;

tests/components/__snapshots__/t_foreach.test.ts.snap

@@ -14,7 +14,7 @@ exports[`list of components components in a node in a t-foreach  1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['items']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`item\`] = k_block2[i1];
+      ctx[\`item\`] = v_block2[i1];
       const key1 = 'li_'+ctx['item'];
       const b4 = comp1({item: ctx['item']}, key + \`__1__\${key1}\`, node, this, null);
       c_block2[i1] = withKey(block3([], [b4]), key1);
@@ -51,7 +51,7 @@ exports[`list of components crash on duplicate key in dev mode 1`] = `
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([1,2]);;
     const keys1 = new Set();
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       const key1 = 'child';
       if (keys1.has(String(key1))) { throw new OwlError(\`Got duplicate key in t-foreach: \${key1}\`)}
       keys1.add(String(key1));
@@ -87,7 +87,7 @@ exports[`list of components crash when using object as keys that serialize to th
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([{},{}]);;
     const keys1 = new Set();
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`item\`] = k_block1[i1];
+      ctx[\`item\`] = v_block1[i1];
       const key1 = ctx['item'];
       if (keys1.has(String(key1))) { throw new OwlError(\`Got duplicate key in t-foreach: \${key1}\`)}
       keys1.add(String(key1));
@@ -125,7 +125,7 @@ exports[`list of components list of sub components inside other nodes 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].blips);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`blip\`] = k_block2[i1];
+      ctx[\`blip\`] = v_block2[i1];
       const key1 = ctx['blip'].id;
       const b4 = comp1({}, key + \`__1__\${key1}\`, node, this, null);
       c_block2[i1] = withKey(block3([], [b4]), key1);
@@ -191,7 +191,7 @@ exports[`list of components order is correct when slots are not of same type 2`]
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['slotNames']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`slotName\`] = k_block1[i1];
+      ctx[\`slotName\`] = v_block1[i1];
       const key1 = ctx['slotName'];
       const slot1 = (ctx['slotName']);
       c_block1[i1] = withKey(toggler(slot1, callSlot(ctx, node, key1 + \`__1__\${key1}\`, slot1, true, {})), key1);
@@ -214,13 +214,13 @@ exports[`list of components reconciliation alg works for t-foreach in t-foreach
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].s);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`section\`] = k_block2[i1];
+      ctx[\`section\`] = v_block2[i1];
       ctx[\`section_index\`] = i1;
       const key1 = ctx['section_index'];
       ctx = Object.create(ctx);
       const [k_block3, v_block3, l_block3, c_block3] = prepareList(ctx['section'].blips);;
       for (let i2 = 0; i2 < l_block3; i2++) {
-        ctx[\`blip\`] = k_block3[i2];
+        ctx[\`blip\`] = v_block3[i2];
         ctx[\`blip_index\`] = i2;
         const key2 = ctx['blip_index'];
         c_block3[i2] = withKey(comp1({blip: ctx['blip']}, key + \`__1__\${key1}__\${key2}\`, node, this, null), key2);
@@ -263,12 +263,12 @@ exports[`list of components reconciliation alg works for t-foreach in t-foreach,
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].rows);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`row\`] = k_block2[i1];
+      ctx[\`row\`] = v_block2[i1];
       const key1 = ctx['row'];
       ctx = Object.create(ctx);
       const [k_block4, v_block4, l_block4, c_block4] = prepareList(ctx['state'].cols);;
       for (let i2 = 0; i2 < l_block4; i2++) {
-        ctx[\`col\`] = k_block4[i2];
+        ctx[\`col\`] = v_block4[i2];
         const key2 = ctx['col'];
         const b6 = comp1({row: ctx['row'],col: ctx['col']}, key + \`__1__\${key1}__\${key2}\`, node, this, null);
         c_block4[i2] = withKey(block5([], [b6]), key2);
@@ -308,7 +308,7 @@ exports[`list of components simple list 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['state'].elems);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`elem\`] = k_block1[i1];
+      ctx[\`elem\`] = v_block1[i1];
       const key1 = ctx['elem'].id;
       c_block1[i1] = withKey(comp1({value: ctx['elem'].value}, key + \`__1__\${key1}\`, node, this, null), key1);
     }
@@ -344,7 +344,7 @@ exports[`list of components sub components rendered in a loop 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].numbers);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`number\`] = k_block2[i1];
+      ctx[\`number\`] = v_block2[i1];
       const key1 = ctx['number'];
       c_block2[i1] = withKey(comp1({n: ctx['number']}, key + \`__1__\${key1}\`, node, this, null), key1);
     }
@@ -381,7 +381,7 @@ exports[`list of components sub components with some state rendered in a loop 1`
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].numbers);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`number\`] = k_block2[i1];
+      ctx[\`number\`] = v_block2[i1];
       const key1 = ctx['number'];
       c_block2[i1] = withKey(comp1({}, key + \`__1__\${key1}\`, node, this, null), key1);
     }
@@ -418,7 +418,7 @@ exports[`list of components switch component position 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['clist']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`c\`] = k_block2[i1];
+      ctx[\`c\`] = v_block2[i1];
       const key1 = ctx['c'];
       c_block2[i1] = withKey(comp1({key: ctx['c']}, key + \`__1__\${key1}\`, node, this, null), key1);
     }
@@ -455,7 +455,7 @@ exports[`list of components t-foreach with t-component, and update 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(Array(2));;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`n\`] = k_block2[i1];
+      ctx[\`n\`] = v_block2[i1];
       ctx[\`n_index\`] = i1;
       const key1 = ctx['n_index'];
       c_block2[i1] = withKey(comp1({val: ctx['n_index']}, key + \`__1__\${key1}\`, node, this, null), key1);

tests/components/__snapshots__/t_key.test.ts.snap

@@ -13,7 +13,7 @@ exports[`t-key t-foreach with t-key switch component position 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['clist']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`c\`] = k_block2[i1];
+      ctx[\`c\`] = v_block2[i1];
       const key1 = ctx['c'];
       const tKey_1 = ctx['key1'];
       c_block2[i1] = withKey(comp1({key: ctx['c']+ctx['key1']}, tKey_1 + key + \`__1__\${key1}\`, node, this, null), tKey_1 + key1);

tests/components/__snapshots__/t_model.test.ts.snap

@@ -44,26 +44,7 @@ exports[`t-model directive .trim modifier 1`] = `
   let { text, createBlock, list, multi, html, toggler, comment } = bdom;
   let { toNumber } = helpers;
   
-  let block1 = createBlock(\`<div><input block-property-0=\\"value\\" block-handler-1=\\"change\\"/><span><block-text-2/></span></div>\`);
-  
-  return function template(ctx, node, key = \\"\\") {
-    const bExpr1 = ctx['state'];
-    const expr1 = 'text';
-    let prop1 = bExpr1[expr1];
-    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value.trim(); }];
-    let txt1 = ctx['state'].text;
-    return block1([prop1, hdlr1, txt1]);
-  }
-}"
-`;
-
-exports[`t-model directive .trim modifier implies .lazy modifier 1`] = `
-"function anonymous(app, bdom, helpers
-) {
-  let { text, createBlock, list, multi, html, toggler, comment } = bdom;
-  let { toNumber } = helpers;
-  
-  let block1 = createBlock(\`<div><input block-property-0=\\"value\\" block-handler-1=\\"change\\"/><span><block-text-2/></span></div>\`);
+  let block1 = createBlock(\`<div><input block-property-0=\\"value\\" block-handler-1=\\"input\\"/><span><block-text-2/></span></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
@@ -215,7 +196,7 @@ exports[`t-model directive in a t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`thing\`] = k_block2[i1];
+      ctx[\`thing\`] = v_block2[i1];
       const key1 = ctx['thing'].id;
       const bExpr1 = ctx['thing'];
       const expr1 = 'f';
@@ -242,7 +223,7 @@ exports[`t-model directive in a t-foreach, part 2 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`thing\`] = k_block2[i1];
+      ctx[\`thing\`] = v_block2[i1];
       ctx[\`thing_index\`] = i1;
       const key1 = ctx['thing_index'];
       const bExpr1 = ctx['state'];
@@ -270,7 +251,7 @@ exports[`t-model directive in a t-foreach, part 3 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['names']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`name\`] = k_block2[i1];
+      ctx[\`name\`] = v_block2[i1];
       ctx[\`name_index\`] = i1;
       const key1 = ctx['name_index'];
       const bExpr1 = ctx['state'].values;
@@ -395,7 +376,7 @@ exports[`t-model directive on an input, type=checkbox 1`] = `
   let block1 = createBlock(\`<div><input type=\\"checkbox\\" block-property-0=\\"checked\\" block-handler-1=\\"input\\"/><span><block-child-0/><block-child-1/></span></div>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     const bExpr1 = ctx['state'];
     const expr1 = 'flag';
     let prop1 = bExpr1[expr1];
@@ -504,7 +485,7 @@ exports[`t-model directive t-model with dynamic number values on select options
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].options);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`o\`] = k_block2[i1];
+      ctx[\`o\`] = v_block2[i1];
       const key1 = ctx['o'].value;
       let attr1 = ctx['o'].value;
       let attr2 = bValue1 === ctx['o'].value;
@@ -605,7 +586,7 @@ exports[`t-model directive t-model with dynamic values on select options in fore
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['options']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`v\`] = k_block2[i1];
+      ctx[\`v\`] = v_block2[i1];
       const key1 = ctx['v'];
       let attr1 = ctx['v'];
       let attr2 = bValue1 === ctx['v'];
@@ -632,7 +613,7 @@ exports[`t-model directive t-model with radio button group in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['options']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`opt\`] = k_block2[i1];
+      ctx[\`opt\`] = v_block2[i1];
       const key1 = ctx['opt'];
       let prop1 = new String((ctx['opt']) === 0 ? 0 : ((ctx['opt']) || \\"\\"));
       let attr1 = ctx['opt'];
@@ -659,7 +640,7 @@ exports[`t-model directive two inputs in a div alternating with a t-if 1`] = `
   let block3 = createBlock(\`<input class=\\"b\\" block-property-0=\\"value\\" block-handler-1=\\"input\\"/>\`);
   
   return function template(ctx, node, key = \\"\\") {
-    let b2, b3;
+    let b2,b3;
     if (ctx['state'].flag) {
       const bExpr1 = ctx['state'];
       const expr1 = 'text1';

tests/components/__snapshots__/t_on.test.ts.snap

@@ -16,7 +16,7 @@ exports[`t-on t-on expression captured in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['arr']);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       const key1 = ctx['val'];
       const v1 = ctx['otherState'];
       const v2 = ctx['iter'];
@@ -43,7 +43,7 @@ exports[`t-on t-on expression in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].values);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       ctx[\`val_index\`] = i1;
       const key1 = ctx['val'];
       let txt1 = ctx['val_index'];
@@ -75,7 +75,7 @@ exports[`t-on t-on expression in t-foreach with t-set 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].values);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       ctx[\`val_index\`] = i1;
       const key1 = ctx['val'];
       setContextValue(ctx, \\"bossa\\", ctx['bossa']+'_'+ctx['val_index']);
@@ -106,7 +106,7 @@ exports[`t-on t-on method call in t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['state'].values);;
     for (let i1 = 0; i1 < l_block2; i1++) {
-      ctx[\`val\`] = k_block2[i1];
+      ctx[\`val\`] = v_block2[i1];
       ctx[\`val_index\`] = i1;
       const key1 = ctx['val'];
       let txt1 = ctx['val_index'];
@@ -196,7 +196,7 @@ exports[`t-on t-on on components and t-foreach 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(['John','Raoul','Gérald']);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`name\`] = k_block1[i1];
+      ctx[\`name\`] = v_block1[i1];
       const key1 = ctx['name'];
       const v1 = ctx['this'];
       const v2 = ctx['name'];
@@ -493,7 +493,7 @@ exports[`t-on t-on when first component child is an empty component 2`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList(ctx['props'].list);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`c\`] = k_block1[i1];
+      ctx[\`c\`] = v_block1[i1];
       ctx[\`c_index\`] = i1;
       const key1 = ctx['c_index'];
       let txt1 = ctx['c'];

tests/components/__snapshots__/t_out.test.ts.snap

@@ -17,7 +17,7 @@ exports[`components in t-out simple list 1`] = `
     ctx = Object.create(ctx);
     const [k_block1, v_block1, l_block1, c_block1] = prepareList([1,2]);;
     for (let i1 = 0; i1 < l_block1; i1++) {
-      ctx[\`n\`] = k_block1[i1];
+      ctx[\`n\`] = v_block1[i1];
       const key1 = ctx['n'];
       ctx[\`blabla\`] = new LazyValue(value1, ctx, this, node, key1);
       c_block1[i1] = withKey(safeOutput(ctx['blabla']), key1);

tests/components/basics.test.ts

@@ -5,7 +5,6 @@ import {
   nextAppError,
   nextTick,
   snapshotEverything,
-  steps,
   useLogLifecycle,
 } from "../helpers";
 import { markup } from "../../src/runtime/utils";
@@ -869,26 +868,19 @@ describe("basics", () => {
 
     const parent = await mount(Parent, fixture);
     expect(Object.keys(parent.__owl__.children).length).toStrictEqual(1);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Child:setup",
-        "Child:willStart",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-      ]
-    `);
+    expect([
+      "Child:setup",
+      "Child:willStart",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+    ]).toBeLogged();
 
     parent.ifVar = false;
     parent.render();
     await nextTick();
     expect(Object.keys(parent.__owl__.children).length).toStrictEqual(0);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Child:willUnmount",
-        "Child:willDestroy",
-      ]
-    `);
+    expect(["Child:willUnmount", "Child:willDestroy"]).toBeLogged();
   });
 
   test("component children doesn't leak (t-key case)", async () => {
@@ -907,31 +899,27 @@ describe("basics", () => {
 
     const parent = await mount(Parent, fixture);
     expect(Object.keys(parent.__owl__.children).length).toStrictEqual(1);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Child:setup",
-        "Child:willStart",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-      ]
-    `);
+    expect([
+      "Child:setup",
+      "Child:willStart",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+    ]).toBeLogged();
 
     parent.keyVar = 2;
     parent.render();
     await nextTick();
     expect(Object.keys(parent.__owl__.children).length).toStrictEqual(1);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Child:setup",
-        "Child:willStart",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Child:mounted",
-      ]
-    `);
+    expect([
+      "Child:setup",
+      "Child:willStart",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Child:mounted",
+    ]).toBeLogged();
   });
 
   test("GrandChild display is controlled by its GrandParent", async () => {
@@ -955,27 +943,20 @@ describe("basics", () => {
 
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<div></div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "GrandChild:setup",
-        "GrandChild:willStart",
-        "GrandChild:willRender",
-        "GrandChild:rendered",
-        "GrandChild:mounted",
-      ]
-    `);
+    expect([
+      "GrandChild:setup",
+      "GrandChild:willStart",
+      "GrandChild:willRender",
+      "GrandChild:rendered",
+      "GrandChild:mounted",
+    ]).toBeLogged();
 
     parent.displayGrandChild = false;
     parent.render();
     await nextTick();
     expect(fixture.innerHTML).toBe("");
 
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "GrandChild:willUnmount",
-        "GrandChild:willDestroy",
-      ]
-    `);
+    expect(["GrandChild:willUnmount", "GrandChild:willDestroy"]).toBeLogged();
   });
 });
 
@@ -1043,7 +1024,7 @@ describe("support svg components", () => {
     await mount(Svg, fixture);
 
     expect(fixture.innerHTML).toBe(
-      '<svg xmlns="http://www.w3.org/2000/svg"><g xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="4" stroke="green" stroke-width="1" fill="yellow"></circle></g></svg>'
+      '<svg><g><circle cx="50" cy="50" r="4" stroke="green" stroke-width="1" fill="yellow"></circle></g></svg>'
     );
   });
 });

tests/components/error_handling.test.ts

@@ -19,9 +19,8 @@ import {
   snapshotEverything,
   useLogLifecycle,
   nextAppError,
-  steps,
 } from "../helpers";
-import { OwlError } from "../../src/common/owl_error";
+import { OwlError } from "../../src/runtime/error_handling";
 
 let fixture: HTMLElement;
 
@@ -949,28 +948,26 @@ describe("can catch errors", () => {
     }
     await mount(Root, fixture);
     expect(fixture.innerHTML).toBe("<div><div>Error handled</div></div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Root:setup",
-        "Root:willStart",
-        "Root:willRender",
-        "ErrorBoundary:setup",
-        "ErrorBoundary:willStart",
-        "Root:rendered",
-        "ErrorBoundary:willRender",
-        "ErrorComponent:setup",
-        "ErrorComponent:willStart",
-        "ErrorBoundary:rendered",
-        "ErrorComponent:willRender",
-        "ErrorComponent:rendered",
-        "ErrorComponent:mounted",
-        "boom",
-        "ErrorBoundary:willRender",
-        "ErrorBoundary:rendered",
-        "ErrorBoundary:mounted",
-        "Root:mounted",
-      ]
-    `);
+    expect([
+      "Root:setup",
+      "Root:willStart",
+      "Root:willRender",
+      "ErrorBoundary:setup",
+      "ErrorBoundary:willStart",
+      "Root:rendered",
+      "ErrorBoundary:willRender",
+      "ErrorComponent:setup",
+      "ErrorComponent:willStart",
+      "ErrorBoundary:rendered",
+      "ErrorComponent:willRender",
+      "ErrorComponent:rendered",
+      "ErrorComponent:mounted",
+      "boom",
+      "ErrorBoundary:willRender",
+      "ErrorBoundary:rendered",
+      "ErrorBoundary:mounted",
+      "Root:mounted",
+    ]).toBeLogged();
     expect(mockConsoleError).toBeCalledTimes(0);
     expect(mockConsoleWarn).toBeCalledTimes(0);
   });
@@ -1001,23 +998,21 @@ describe("can catch errors", () => {
     }
     await mount(Root, fixture);
     expect(fixture.innerHTML).toBe("<div>Error handled</div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Root:setup",
-        "Root:willStart",
-        "Root:willRender",
-        "ErrorComponent:setup",
-        "ErrorComponent:willStart",
-        "Root:rendered",
-        "ErrorComponent:willRender",
-        "ErrorComponent:rendered",
-        "ErrorComponent:mounted",
-        "boom",
-        "Root:willRender",
-        "Root:rendered",
-        "Root:mounted",
-      ]
-    `);
+    expect([
+      "Root:setup",
+      "Root:willStart",
+      "Root:willRender",
+      "ErrorComponent:setup",
+      "ErrorComponent:willStart",
+      "Root:rendered",
+      "ErrorComponent:willRender",
+      "ErrorComponent:rendered",
+      "ErrorComponent:mounted",
+      "boom",
+      "Root:willRender",
+      "Root:rendered",
+      "Root:mounted",
+    ]).toBeLogged();
     expect(mockConsoleError).toBeCalledTimes(0);
     expect(mockConsoleWarn).toBeCalledTimes(0);
   });
@@ -1064,33 +1059,31 @@ describe("can catch errors", () => {
     }
     await mount(A, fixture);
     expect(fixture.innerHTML).toBe("<div><div>Error handled</div></div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "A:setup",
-        "A:willStart",
-        "A:willRender",
-        "B:setup",
-        "B:willStart",
-        "A:rendered",
-        "B:willRender",
-        "C:setup",
-        "C:willStart",
-        "B:rendered",
-        "C:willRender",
-        "Boom:setup",
-        "Boom:willStart",
-        "C:rendered",
-        "Boom:willRender",
-        "Boom:rendered",
-        "Boom:mounted",
-        "boom",
-        "C:willRender",
-        "C:rendered",
-        "C:mounted",
-        "B:mounted",
-        "A:mounted",
-      ]
-    `);
+    expect([
+      "A:setup",
+      "A:willStart",
+      "A:willRender",
+      "B:setup",
+      "B:willStart",
+      "A:rendered",
+      "B:willRender",
+      "C:setup",
+      "C:willStart",
+      "B:rendered",
+      "C:willRender",
+      "Boom:setup",
+      "Boom:willStart",
+      "C:rendered",
+      "Boom:willRender",
+      "Boom:rendered",
+      "Boom:mounted",
+      "boom",
+      "C:willRender",
+      "C:rendered",
+      "C:mounted",
+      "B:mounted",
+      "A:mounted",
+    ]).toBeLogged();
     expect(mockConsoleError).toBeCalledTimes(0);
     expect(mockConsoleWarn).toBeCalledTimes(0);
   });
@@ -1137,33 +1130,31 @@ describe("can catch errors", () => {
     }
     await mount(Root, fixture);
     expect(fixture.innerHTML).toBe("<div>OK<div>Error handled</div></div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Root:setup",
-        "Root:willStart",
-        "Root:willRender",
-        "OK:setup",
-        "OK:willStart",
-        "ErrorBoundary:setup",
-        "ErrorBoundary:willStart",
-        "Root:rendered",
-        "OK:willRender",
-        "OK:rendered",
-        "ErrorBoundary:willRender",
-        "ErrorComponent:setup",
-        "ErrorComponent:willStart",
-        "ErrorBoundary:rendered",
-        "ErrorComponent:willRender",
-        "ErrorComponent:rendered",
-        "ErrorComponent:mounted",
-        "boom",
-        "ErrorBoundary:willRender",
-        "ErrorBoundary:rendered",
-        "ErrorBoundary:mounted",
-        "OK:mounted",
-        "Root:mounted",
-      ]
-    `);
+    expect([
+      "Root:setup",
+      "Root:willStart",
+      "Root:willRender",
+      "OK:setup",
+      "OK:willStart",
+      "ErrorBoundary:setup",
+      "ErrorBoundary:willStart",
+      "Root:rendered",
+      "OK:willRender",
+      "OK:rendered",
+      "ErrorBoundary:willRender",
+      "ErrorComponent:setup",
+      "ErrorComponent:willStart",
+      "ErrorBoundary:rendered",
+      "ErrorComponent:willRender",
+      "ErrorComponent:rendered",
+      "ErrorComponent:mounted",
+      "boom",
+      "ErrorBoundary:willRender",
+      "ErrorBoundary:rendered",
+      "ErrorBoundary:mounted",
+      "OK:mounted",
+      "Root:mounted",
+    ]).toBeLogged();
     expect(mockConsoleError).toBeCalledTimes(0);
     expect(mockConsoleWarn).toBeCalledTimes(0);
   });
@@ -1490,39 +1481,35 @@ describe("can catch errors", () => {
 
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("1<div>abc</div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
     parent.state.hasChild = false;
     await nextTick();
     await nextTick();
     await nextTick();
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Parent:patched",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Parent:patched",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Parent:patched",
+    ]).toBeLogged();
     expect(fixture.innerHTML).toBe("2");
   });
 
@@ -1555,15 +1542,13 @@ describe("can catch errors", () => {
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("1");
 
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.hasChild = true;
     await nextMicroTick();
@@ -1571,35 +1556,26 @@ describe("can catch errors", () => {
     await nextMicroTick();
     await nextMicroTick();
     await nextMicroTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+    ]).toBeLogged();
     parent.state.hasChild = false;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Child:willDestroy",
-        "Parent:willRender",
-        "Parent:rendered",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Child:willDestroy",
+      "Parent:willRender",
+      "Parent:rendered",
+    ]).toBeLogged();
     expect(fixture.innerHTML).toBe("1");
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willPatch",
-        "Parent:patched",
-      ]
-    `);
+    expect(["Parent:willPatch", "Parent:patched"]).toBeLogged();
     expect(fixture.innerHTML).toBe("2");
   });
 });

tests/components/hooks.test.ts

@@ -641,56 +641,6 @@ describe("hooks", () => {
       ]);
     });
 
-    test("effect types are inferred from dependencies", async () => {
-      // @ts-ignore (declared but never used)
-      // eslint-disable-next-line @typescript-eslint/no-unused-vars
-      class MyComponent extends Component {
-        static template = xml`<div/>`;
-
-        setup() {
-          useEffect(
-            (a, b) => {
-              expectType<number>(a);
-              expectType<string>(b);
-            },
-            () => [3, "hello"]
-          );
-        }
-      }
-    });
-
-    test("effect type allows an effect with partial dependencies parameters", async () => {
-      // @ts-ignore (declared but never used)
-      // eslint-disable-next-line @typescript-eslint/no-unused-vars
-      class MyComponent extends Component {
-        static template = xml`<div/>`;
-
-        setup() {
-          useEffect(
-            (a) => {
-              expectType<number>(a);
-            },
-            () => [3, "hello"]
-          );
-        }
-      }
-    });
-
-    test("effect type allows an effect with no dependency parameter", async () => {
-      // @ts-ignore (declared but never used)
-      // eslint-disable-next-line @typescript-eslint/no-unused-vars
-      class MyComponent extends Component {
-        static template = xml`<div/>`;
-
-        setup() {
-          useEffect(
-            () => {},
-            () => [3, "hello"]
-          );
-        }
-      }
-    });
-
     test("properly behaves when the effect function throws", async () => {
       let originalconsoleError = console.error;
       let originalconsoleWarn = console.warn;
@@ -723,5 +673,3 @@ describe("hooks", () => {
     });
   });
 });
-
-function expectType<T>(t: T) {}

tests/components/lifecycle.test.ts

@@ -17,7 +17,6 @@ import {
   nextMicroTick,
   nextTick,
   snapshotEverything,
-  steps,
   useLogLifecycle,
 } from "../helpers";
 
@@ -456,51 +455,45 @@ describe("lifecycle hooks", () => {
 
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<div><span>0</span></div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.increment();
     await nextTick();
     expect(fixture.innerHTML).toBe("<div><span>1</span></div>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:willUpdateProps",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Parent:willPatch",
-        "Child:willPatch",
-        "Child:patched",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:willUpdateProps",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Parent:willPatch",
+      "Child:willPatch",
+      "Child:patched",
+      "Parent:patched",
+    ]).toBeLogged();
 
     parent.toggleSubWidget();
     await nextTick();
     expect(fixture.innerHTML).toBe("");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Parent:patched",
+    ]).toBeLogged();
   });
 
   test("hooks are called in proper order in widget creation/destruction", async () => {
@@ -521,30 +514,26 @@ describe("lifecycle hooks", () => {
 
     const app = new App(Parent);
     await app.mount(fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     app.destroy();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willUnmount",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Parent:willDestroy",
-      ]
-    `);
+    expect([
+      "Parent:willUnmount",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Parent:willDestroy",
+    ]).toBeLogged();
   });
 
   test("willUpdateProps hook is called", async () => {
@@ -643,30 +632,26 @@ describe("lifecycle hooks", () => {
 
     const app = new App(Parent);
     await app.mount(fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     app.destroy();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willUnmount",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Parent:willDestroy",
-      ]
-    `);
+    expect([
+      "Parent:willUnmount",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Parent:willDestroy",
+    ]).toBeLogged();
   });
 
   test("lifecycle semantics, part 2", async () => {
@@ -695,48 +680,42 @@ describe("lifecycle hooks", () => {
 
     const app = new App(Parent);
     const parent = await app.mount(fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.hasChild = true;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "GrandChild:setup",
-        "GrandChild:willStart",
-        "Child:rendered",
-        "GrandChild:willRender",
-        "GrandChild:rendered",
-        "Parent:willPatch",
-        "GrandChild:mounted",
-        "Child:mounted",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "GrandChild:setup",
+      "GrandChild:willStart",
+      "Child:rendered",
+      "GrandChild:willRender",
+      "GrandChild:rendered",
+      "Parent:willPatch",
+      "GrandChild:mounted",
+      "Child:mounted",
+      "Parent:patched",
+    ]).toBeLogged();
 
     app.destroy();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willUnmount",
-        "Child:willUnmount",
-        "GrandChild:willUnmount",
-        "GrandChild:willDestroy",
-        "Child:willDestroy",
-        "Parent:willDestroy",
-      ]
-    `);
+    expect([
+      "Parent:willUnmount",
+      "Child:willUnmount",
+      "GrandChild:willUnmount",
+      "GrandChild:willDestroy",
+      "Child:willDestroy",
+      "Parent:willDestroy",
+    ]).toBeLogged();
   });
 
   test("lifecycle semantics, part 3", async () => {
@@ -765,26 +744,19 @@ describe("lifecycle hooks", () => {
 
     const app = new App(Parent);
     const parent = await app.mount(fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.hasChild = true;
     // immediately destroy everything
     app.destroy();
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willUnmount",
-        "Parent:willDestroy",
-      ]
-    `);
+    expect(["Parent:willUnmount", "Parent:willDestroy"]).toBeLogged();
   });
 
   test("lifecycle semantics, part 4", async () => {
@@ -817,40 +789,34 @@ describe("lifecycle hooks", () => {
     const app = new App(Parent);
     const parent = await app.mount(fixture);
 
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.hasChild = true;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "GrandChild:setup",
-        "GrandChild:willStart",
-        "Child:rendered",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "GrandChild:setup",
+      "GrandChild:willStart",
+      "Child:rendered",
+    ]).toBeLogged();
 
     app.destroy();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willUnmount",
-        "GrandChild:willDestroy",
-        "Child:willDestroy",
-        "Parent:willDestroy",
-      ]
-    `);
+    expect([
+      "Parent:willUnmount",
+      "GrandChild:willDestroy",
+      "Child:willDestroy",
+      "Parent:willDestroy",
+    ]).toBeLogged();
   });
 
   test("lifecycle semantics, part 5", async () => {
@@ -871,33 +837,29 @@ describe("lifecycle hooks", () => {
     }
 
     const parent = await mount(Parent, fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.hasChild = false;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Parent:patched",
+    ]).toBeLogged();
   });
 
   test("lifecycle semantics, part 6", async () => {
@@ -918,36 +880,32 @@ describe("lifecycle hooks", () => {
     }
 
     const parent = await mount(Parent, fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.value = 2;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:willUpdateProps",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Parent:willPatch",
-        "Child:willPatch",
-        "Child:patched",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:willUpdateProps",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Parent:willPatch",
+      "Child:willPatch",
+      "Child:patched",
+      "Parent:patched",
+    ]).toBeLogged();
   });
 
   test("onWillRender", async () => {
@@ -979,53 +937,43 @@ describe("lifecycle hooks", () => {
 
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<button>1</button>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.value++; // to block child render
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:willUpdateProps",
-        "Parent:rendered",
-      ]
-    `);
+    expect(["Parent:willRender", "Child:willUpdateProps", "Parent:rendered"]).toBeLogged();
 
     fixture.querySelector("button")!.click();
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`Array []`);
+    expect([]).toBeLogged();
 
     fixture.querySelector("button")!.click();
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`Array []`);
+    expect([]).toBeLogged();
     expect(fixture.innerHTML).toBe("<button>1</button>");
 
     def.resolve();
     await nextTick();
     expect(fixture.innerHTML).toBe("<button>3</button>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Child:willRender",
-        "Child:rendered",
-        "Parent:willPatch",
-        "Child:willPatch",
-        "Child:patched",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Child:willRender",
+      "Child:rendered",
+      "Parent:willPatch",
+      "Child:willPatch",
+      "Child:patched",
+      "Parent:patched",
+    ]).toBeLogged();
   });
 
   // TODO: rename (remove? seems covered by lifecycle semantics)
@@ -1106,54 +1054,50 @@ describe("lifecycle hooks", () => {
 
     await mount(A, fixture);
     expect(fixture.innerHTML).toBe(`<div>A<div>B</div><div>C<div>D</div><div>E</div></div></div>`);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "A:setup",
-        "A:willStart",
-        "A:willRender",
-        "B:setup",
-        "B:willStart",
-        "C:setup",
-        "C:willStart",
-        "A:rendered",
-        "B:willRender",
-        "B:rendered",
-        "C:willRender",
-        "D:setup",
-        "D:willStart",
-        "E:setup",
-        "E:willStart",
-        "C:rendered",
-        "D:willRender",
-        "D:rendered",
-        "E:willRender",
-        "E:rendered",
-        "E:mounted",
-        "D:mounted",
-        "C:mounted",
-        "B:mounted",
-        "A:mounted",
-      ]
-    `);
+    expect([
+      "A:setup",
+      "A:willStart",
+      "A:willRender",
+      "B:setup",
+      "B:willStart",
+      "C:setup",
+      "C:willStart",
+      "A:rendered",
+      "B:willRender",
+      "B:rendered",
+      "C:willRender",
+      "D:setup",
+      "D:willStart",
+      "E:setup",
+      "E:willStart",
+      "C:rendered",
+      "D:willRender",
+      "D:rendered",
+      "E:willRender",
+      "E:rendered",
+      "E:mounted",
+      "D:mounted",
+      "C:mounted",
+      "B:mounted",
+      "A:mounted",
+    ]).toBeLogged();
 
     // update
     c!.state.flag = false;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "C:willRender",
-        "F:setup",
-        "F:willStart",
-        "C:rendered",
-        "F:willRender",
-        "F:rendered",
-        "C:willPatch",
-        "E:willUnmount",
-        "E:willDestroy",
-        "F:mounted",
-        "C:patched",
-      ]
-    `);
+    expect([
+      "C:willRender",
+      "F:setup",
+      "F:willStart",
+      "C:rendered",
+      "F:willRender",
+      "F:rendered",
+      "C:willPatch",
+      "E:willUnmount",
+      "E:willDestroy",
+      "F:mounted",
+      "C:patched",
+    ]).toBeLogged();
   });
 
   test("mounted hook is called on every mount, not just the first one", async () => {
@@ -1174,49 +1118,43 @@ describe("lifecycle hooks", () => {
     }
 
     const parent = await mount(Parent, fixture);
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Child:mounted",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Child:mounted",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.hasChild = false;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Child:willUnmount",
-        "Child:willDestroy",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Child:willUnmount",
+      "Child:willDestroy",
+      "Parent:patched",
+    ]).toBeLogged();
 
     parent.state.hasChild = true;
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Child:willRender",
-        "Child:rendered",
-        "Parent:willPatch",
-        "Child:mounted",
-        "Parent:patched",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Child:willRender",
+      "Child:rendered",
+      "Parent:willPatch",
+      "Child:mounted",
+      "Parent:patched",
+    ]).toBeLogged();
   });
 
   test("render in mounted", async () => {
@@ -1234,26 +1172,19 @@ describe("lifecycle hooks", () => {
 
     await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<span></span>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-        "Parent:willRender",
-        "Parent:rendered",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+      "Parent:willRender",
+      "Parent:rendered",
+    ]).toBeLogged();
 
     await nextTick();
     expect(fixture.innerHTML).toBe("<span>Patched</span>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willPatch",
-        "Parent:patched",
-      ]
-    `);
+    expect(["Parent:willPatch", "Parent:patched"]).toBeLogged();
   });
 
   test("render in patched", async () => {
@@ -1274,38 +1205,29 @@ describe("lifecycle hooks", () => {
 
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<span></span>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.render();
     await nextTick();
     expect(fixture.innerHTML).toBe("<span></span>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Parent:patched",
-        "Parent:willRender",
-        "Parent:rendered",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Parent:patched",
+      "Parent:willRender",
+      "Parent:rendered",
+    ]).toBeLogged();
 
     await nextTick();
     expect(fixture.innerHTML).toBe("<span>Patched</span>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willPatch",
-        "Parent:patched",
-      ]
-    `);
+    expect(["Parent:willPatch", "Parent:patched"]).toBeLogged();
   });
 
   test("render in willPatch", async () => {
@@ -1326,38 +1248,29 @@ describe("lifecycle hooks", () => {
 
     const parent = await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<span></span>");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.render();
     await nextTick();
     expect(fixture.innerHTML).toBe("<span></span>");
 
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:willPatch",
-        "Parent:patched",
-        "Parent:willRender",
-        "Parent:rendered",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:willPatch",
+      "Parent:patched",
+      "Parent:willRender",
+      "Parent:rendered",
+    ]).toBeLogged();
 
     await nextTick();
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willPatch",
-        "Parent:patched",
-      ]
-    `);
+    expect(["Parent:willPatch", "Parent:patched"]).toBeLogged();
     expect(fixture.innerHTML).toBe("<span>Patched</span>");
   });
 
@@ -1400,21 +1313,19 @@ describe("lifecycle hooks", () => {
     await nextTick();
     app.destroy();
 
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "onWillStart",
-        "onWillRender",
-        "onRendered",
-        "onMounted",
-        "onWillUpdateProps",
-        "onWillRender",
-        "onRendered",
-        "onWillPatch",
-        "onPatched",
-        "onWillUnmount",
-        "onWillDestroy",
-      ]
-    `);
+    expect([
+      "onWillStart",
+      "onWillRender",
+      "onRendered",
+      "onMounted",
+      "onWillUpdateProps",
+      "onWillRender",
+      "onRendered",
+      "onWillPatch",
+      "onPatched",
+      "onWillUnmount",
+      "onWillDestroy",
+    ]).toBeLogged();
   });
 
   test("destroy new children before being mountged", async () => {
@@ -1446,30 +1357,26 @@ describe("lifecycle hooks", () => {
     const app = new App(Parent);
     const parent = await app.mount(fixture);
     expect(fixture.innerHTML).toBe("beforeafter");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:setup",
-        "Parent:willStart",
-        "Parent:willRender",
-        "Parent:rendered",
-        "Parent:mounted",
-      ]
-    `);
+    expect([
+      "Parent:setup",
+      "Parent:willStart",
+      "Parent:willRender",
+      "Parent:rendered",
+      "Parent:mounted",
+    ]).toBeLogged();
 
     parent.state.flag = true;
 
     await nextTick();
     expect(fixture.innerHTML).toBe("");
-    expect(steps.splice(0)).toMatchInlineSnapshot(`
-      Array [
-        "Parent:willRender",
-        "Child:setup",
-        "Child:willStart",
-        "Parent:rendered",
-        "Parent:willUnmount",
-        "Child:willDestroy",
-        "Parent:willDestroy",
-      ]
-    `);
+    expect([
+      "Parent:willRender",
+      "Child:setup",
+      "Child:willStart",
+      "Parent:rendered",
+      "Parent:willUnmount",
+      "Child:willDestroy",
+      "Parent:willDestroy",
+    ]).toBeLogged();
   });
 });

tests/components/props.test.ts

@@ -1,5 +1,5 @@
 import { Component, mount, onWillUpdateProps, useState, xml } from "../../src";
-import { makeTestFixture, nextTick, snapshotEverything, steps, useLogLifecycle } from "../helpers";
+import { makeTestFixture, nextTick, snapshotEverything, useLogLifecycle } from "../helpers";
 
 let fixture: HTMLElement;
 
@@ -272,30 +272,26 @@ test("bound functions are considered 'alike'", async () => {
 
   const parent = await mount(Parent, fixture);
   expect(fixture.innerHTML).toBe("1child");
-  expect(steps.splice(0)).toMatchInlineSnapshot(`
-    Array [
-      "Parent:setup",
-      "Parent:willStart",
-      "Parent:willRender",
-      "Child:setup",
-      "Child:willStart",
-      "Parent:rendered",
-      "Child:willRender",
-      "Child:rendered",
-      "Child:mounted",
-      "Parent:mounted",
-    ]
-  `);
+  expect([
+    "Parent:setup",
+    "Parent:willStart",
+    "Parent:willRender",
+    "Child:setup",
+    "Child:willStart",
+    "Parent:rendered",
+    "Child:willRender",
+    "Child:rendered",
+    "Child:mounted",
+    "Parent:mounted",
+  ]).toBeLogged();
   parent.state.val = 3;
   await nextTick();
-  expect(steps.splice(0)).toMatchInlineSnapshot(`
-    Array [
-      "Parent:willRender",
-      "Parent:rendered",
-      "Parent:willPatch",
-      "Parent:patched",
-    ]
-  `);
+  expect([
+    "Parent:willRender",
+    "Parent:rendered",
+    "Parent:willPatch",
+    "Parent:patched",
+  ]).toBeLogged();
   expect(fixture.innerHTML).toBe("3child");
 });
 
@@ -334,33 +330,29 @@ test(".alike suffix in a simple case", async () => {
   }
 
   const parent = await mount(Parent, fixture);
-  expect(steps.splice(0)).toMatchInlineSnapshot(`
-    Array [
-      "Parent:setup",
-      "Parent:willStart",
-      "Parent:willRender",
-      "Child:setup",
-      "Child:willStart",
-      "Parent:rendered",
-      "Child:willRender",
-      "Child:rendered",
-      "Child:mounted",
-      "Parent:mounted",
-    ]
-  `);
+  expect([
+    "Parent:setup",
+    "Parent:willStart",
+    "Parent:willRender",
+    "Child:setup",
+    "Child:willStart",
+    "Parent:rendered",
+    "Child:willRender",
+    "Child:rendered",
+    "Child:mounted",
+    "Parent:mounted",
+  ]).toBeLogged();
 
   expect(fixture.innerHTML).toBe("01");
   parent.state.counter++;
   await nextTick();
   expect(fixture.innerHTML).toBe("11");
-  expect(steps.splice(0)).toMatchInlineSnapshot(`
-    Array [
-      "Parent:willRender",
-      "Parent:rendered",
-      "Parent:willPatch",
-      "Parent:patched",
-    ]
-  `);
+  expect([
+    "Parent:willRender",
+    "Parent:rendered",
+    "Parent:willPatch",
+    "Parent:patched",
+  ]).toBeLogged();
 });
 
 test(".alike suffix in a list", async () => {
@@ -396,40 +388,36 @@ test(".alike suffix in a list", async () => {
   }
 
   await mount(Parent, fixture);
-  expect(steps.splice(0)).toMatchInlineSnapshot(`
-    Array [
-      "Parent:setup",
-      "Parent:willStart",
-      "Parent:willRender",
-      "Todo:setup",
-      "Todo:willStart",
-      "Todo:setup",
-      "Todo:willStart",
-      "Parent:rendered",
-      "Todo:willRender",
-      "Todo:rendered",
-      "Todo:willRender",
-      "Todo:rendered",
-      "Todo:mounted",
-      "Todo:mounted",
-      "Parent:mounted",
-    ]
-  `);
+  expect([
+    "Parent:setup",
+    "Parent:willStart",
+    "Parent:willRender",
+    "Todo:setup",
+    "Todo:willStart",
+    "Todo:setup",
+    "Todo:willStart",
+    "Parent:rendered",
+    "Todo:willRender",
+    "Todo:rendered",
+    "Todo:willRender",
+    "Todo:rendered",
+    "Todo:mounted",
+    "Todo:mounted",
+    "Parent:mounted",
+  ]).toBeLogged();
 
   expect(fixture.innerHTML).toBe("<button>1</button><button>2V</button>");
   fixture.querySelector("button")?.click();
   await nextTick();
   expect(fixture.innerHTML).toBe("<button>1V</button><button>2V</button>");
-  expect(steps.splice(0)).toMatchInlineSnapshot(`
-    Array [
-      "Parent:willRender",
-      "Parent:rendered",
-      "Todo:willRender",
-      "Todo:rendered",
-      "Todo:willPatch",
-      "Todo:patched",
-      "Parent:willPatch",
-      "Parent:patched",
-    ]
-  `);
+  expect([
+    "Parent:willRender",
+    "Parent:rendered",
+    "Todo:willRender",
+    "Todo:rendered",
+    "Todo:willPatch",
+    "Todo:patched",
+    "Parent:willPatch",
+    "Parent:patched",
+  ]).toBeLogged();
 });