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dependabot[bot] e8557507ff Bump @angular/compiler-cli from 20.3.17 to 21.2.0 in /web_embedding/ng-flutter (#2813) 
Bumps [@angular/compiler-cli](https://github.com/angular/angular/tree/HEAD/packages/compiler-cli) from 20.3.17 to 21.2.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/angular/angular/releases"><code>@​angular/compiler-cli</code>'s releases</a>.</em></p>
<blockquote>
<h2>VSCode Extension: 21.2.0</h2>
<ul>
<li>fix(vscode-extension): Highlight function calls with optional chaining (<a href="4f8d3995f0">4f8d3995f0</a>)</li>
<li>feat(language-service): add linked editing ranges for HTML tag synchronization (<a href="8c21866f49">8c21866f49</a>)</li>
<li>fix(vscode-extension): support highlighting for class bindings with brackets (<a href="01ed57f297">01ed57f297</a>)</li>
<li>feat(language-service): add JSON schema for angularCompilerOptions (<a href="496967e7b1">496967e7b1</a>)</li>
<li>fix(language-service): Detect local project version on creation (<a href="8a7cbd4668">8a7cbd4668</a>)</li>
<li>feat(language-server): Support client-side file watching via <code>onDidChangeWatchedFiles</code> (<a href="6fb39d9b62">6fb39d9b62</a>)</li>
<li>feat(language-server): Add completions and hover info for inline styles (<a href="ebc90c26f5">ebc90c26f5</a>)</li>
<li>feat(language-server): Add quick info for inline styles (<a href="573aadef7e">573aadef7e</a>)</li>
<li>feat(language-server): Add folding range support for inline styles (<a href="26fd0839c3">26fd0839c3</a>)</li>
</ul>
<h2>21.2.0</h2>
<h3>common</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="18003a33bb"><img src="https://img.shields.io/badge/18003a33bb-feat-blue" alt="feat - 18003a33bb" /></a></td>
<td>add an 'outlet' injector option for ngTemplateOutlet</td>
</tr>
<tr>
<td><a href="8bbe6dc46c"><img src="https://img.shields.io/badge/8bbe6dc46c-feat-blue" alt="feat - 8bbe6dc46c" /></a></td>
<td>Add Location strategies to manage trailing slash on write</td>
</tr>
<tr>
<td><a href="51cc914807"><img src="https://img.shields.io/badge/51cc914807-feat-blue" alt="feat - 51cc914807" /></a></td>
<td>support height in ImageLoaderConfig and built-in loaders</td>
</tr>
</tbody>
</table>
<h3>compiler</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="72534e2a34"><img src="https://img.shields.io/badge/72534e2a34-feat-blue" alt="feat - 72534e2a34" /></a></td>
<td>Add support for the <code>instanceof</code> binary operator</td>
</tr>
<tr>
<td><a href="95b3f37d4a"><img src="https://img.shields.io/badge/95b3f37d4a-feat-blue" alt="feat - 95b3f37d4a" /></a></td>
<td>Exhaustive checks for switch blocks</td>
</tr>
<tr>
<td><a href="04ba09a8d9"><img src="https://img.shields.io/badge/04ba09a8d9-feat-blue" alt="feat - 04ba09a8d9" /></a></td>
<td>support <code>AstVisitor.visitEmptyExpr()</code></td>
</tr>
<tr>
<td><a href="ce80136e7b"><img src="https://img.shields.io/badge/ce80136e7b-fix-green" alt="fix - ce80136e7b" /></a></td>
<td>optimize away unnecessary restore/reset view calls</td>
</tr>
<tr>
<td><a href="3242a61bae"><img src="https://img.shields.io/badge/3242a61bae-fix-green" alt="fix - 3242a61bae" /></a></td>
<td>variable counter visiting some expressions twice</td>
</tr>
</tbody>
</table>
<h3>compiler-cli</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="473dd3e1cb"><img src="https://img.shields.io/badge/473dd3e1cb-fix-green" alt="fix - 473dd3e1cb" /></a></td>
<td>attach source spans to object literal keys in TCB</td>
</tr>
<tr>
<td><a href="a904d9f77b"><img src="https://img.shields.io/badge/a904d9f77b-fix-green" alt="fix - a904d9f77b" /></a></td>
<td>support nested component declaration</td>
</tr>
<tr>
<td><a href="2ea6dfc6c9"><img src="https://img.shields.io/badge/2ea6dfc6c9-fix-green" alt="fix - 2ea6dfc6c9" /></a></td>
<td>update diagnostic to flag no-op arrow functions in listeners</td>
</tr>
</tbody>
</table>
<h3>core</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="8d5210c9fe"><img src="https://img.shields.io/badge/8d5210c9fe-feat-blue" alt="feat - 8d5210c9fe" /></a></td>
<td>add ChangeDetectionStrategy.Eager alias for Default</td>
</tr>
<tr>
<td><a href="92d2498910"><img src="https://img.shields.io/badge/92d2498910-feat-blue" alt="feat - 92d2498910" /></a></td>
<td>add host node to DeferBlockData (<a href="https://github.com/angular/angular/tree/HEAD/packages/compiler-cli/issues/66546">#66546</a>)</td>
</tr>
<tr>
<td><a href="ea2016a6dc"><img src="https://img.shields.io/badge/ea2016a6dc-feat-blue" alt="feat - ea2016a6dc" /></a></td>
<td>add support for nested animations</td>
</tr>
<tr>
<td><a href="81cabc1477"><img src="https://img.shields.io/badge/81cabc1477-feat-blue" alt="feat - 81cabc1477" /></a></td>
<td>add support for TypeScript 6</td>
</tr>
<tr>
<td><a href="1ba9b7ac50"><img src="https://img.shields.io/badge/1ba9b7ac50-feat-blue" alt="feat - 1ba9b7ac50" /></a></td>
<td>resource composition via snapshots</td>
</tr>
<tr>
<td><a href="d9923b72a2"><img src="https://img.shields.io/badge/d9923b72a2-feat-blue" alt="feat - d9923b72a2" /></a></td>
<td>support arrow functions in expressions</td>
</tr>
<tr>
<td><a href="a7e8abbb7e"><img src="https://img.shields.io/badge/a7e8abbb7e-fix-green" alt="fix - a7e8abbb7e" /></a></td>
<td>correctly handle SkipSelf when resolving from embedded view injector</td>
</tr>
<tr>
<td><a href="0806ee3826"><img src="https://img.shields.io/badge/0806ee3826-fix-green" alt="fix - 0806ee3826" /></a></td>
<td>prevent animated element duplication with dynamic components in zoneless mode</td>
</tr>
<tr>
<td><a href="ed78fa05c7"><img src="https://img.shields.io/badge/ed78fa05c7-fix-green" alt="fix - ed78fa05c7" /></a></td>
<td>Remove note to skip arrow functions in best practices</td>
</tr>
</tbody>
</table>
<h3>forms</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="f56bb07d83"><img src="https://img.shields.io/badge/f56bb07d83-feat-blue" alt="feat - f56bb07d83" /></a></td>
<td>add field param to submit action and onInvalid</td>
</tr>
<tr>
<td><a href="ba009b6031"><img src="https://img.shields.io/badge/ba009b6031-feat-blue" alt="feat - ba009b6031" /></a></td>
<td>add form directive</td>
</tr>
<tr>
<td><a href="22afbb2f36"><img src="https://img.shields.io/badge/22afbb2f36-feat-blue" alt="feat - 22afbb2f36" /></a></td>
<td>add parsing support to native inputs (<a href="https://github.com/angular/angular/tree/HEAD/packages/compiler-cli/issues/66917">#66917</a>)</td>
</tr>
</tbody>
</table>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/angular/angular/blob/main/CHANGELOG.md"><code>@​angular/compiler-cli</code>'s changelog</a>.</em></p>
<blockquote>
<h1>20.3.17 (2026-02-25)</h1>
<h2>Breaking Changes</h2>
<h3>core</h3>
<ul>
<li>
<p>Angular now only applies known attributes from HTML in translated ICU content. Unknown attributes are dropped and not rendered.</p>
<p>(cherry picked from commit 03da204b6daa5e4583e0d0968c2107390bbd8235)</p>
</li>
</ul>
<h3>core</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="7f9de3c118">7f9de3c118</a></td>
<td>fix</td>
<td>block creation of sensitive URI attributes from ICU messages</td>
</tr>
</tbody>
</table>
<h1>21.2.0 (2026-02-25)</h1>
<h3>common</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="18003a33bb">18003a33bb</a></td>
<td>feat</td>
<td>add an 'outlet' injector option for ngTemplateOutlet</td>
</tr>
<tr>
<td><a href="8bbe6dc46c">8bbe6dc46c</a></td>
<td>feat</td>
<td>Add Location strategies to manage trailing slash on write</td>
</tr>
<tr>
<td><a href="51cc914807">51cc914807</a></td>
<td>feat</td>
<td>support height in ImageLoaderConfig and built-in loaders</td>
</tr>
</tbody>
</table>
<h3>compiler</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="72534e2a34">72534e2a34</a></td>
<td>feat</td>
<td>Add support for the <code>instanceof</code> binary operator</td>
</tr>
<tr>
<td><a href="95b3f37d4a">95b3f37d4a</a></td>
<td>feat</td>
<td>Exhaustive checks for switch blocks</td>
</tr>
<tr>
<td><a href="04ba09a8d9">04ba09a8d9</a></td>
<td>feat</td>
<td>support <code>AstVisitor.visitEmptyExpr()</code></td>
</tr>
<tr>
<td><a href="ce80136e7b">ce80136e7b</a></td>
<td>fix</td>
<td>optimize away unnecessary restore/reset view calls</td>
</tr>
<tr>
<td><a href="3242a61bae">3242a61bae</a></td>
<td>fix</td>
<td>variable counter visiting some expressions twice</td>
</tr>
</tbody>
</table>
<h3>compiler-cli</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="473dd3e1cb">473dd3e1cb</a></td>
<td>fix</td>
<td>attach source spans to object literal keys in TCB</td>
</tr>
<tr>
<td><a href="a904d9f77b">a904d9f77b</a></td>
<td>fix</td>
<td>support nested component declaration</td>
</tr>
<tr>
<td><a href="2ea6dfc6c9">2ea6dfc6c9</a></td>
<td>fix</td>
<td>update diagnostic to flag no-op arrow functions in listeners</td>
</tr>
</tbody>
</table>
<h3>core</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="8d5210c9fe">8d5210c9fe</a></td>
<td>feat</td>
<td>add ChangeDetectionStrategy.Eager alias for Default</td>
</tr>
<tr>
<td><a href="92d2498910">92d2498910</a></td>
<td>feat</td>
<td>add host node to DeferBlockData (<a href="https://redirect.github.com/angular/angular/pull/66546">#66546</a>)</td>
</tr>
<tr>
<td><a href="ea2016a6dc">ea2016a6dc</a></td>
<td>feat</td>
<td>add support for nested animations</td>
</tr>
<tr>
<td><a href="81cabc1477">81cabc1477</a></td>
<td>feat</td>
<td>add support for TypeScript 6</td>
</tr>
<tr>
<td><a href="1ba9b7ac50">1ba9b7ac50</a></td>
<td>feat</td>
<td>resource composition via snapshots</td>
</tr>
<tr>
<td><a href="d9923b72a2">d9923b72a2</a></td>
<td>feat</td>
<td>support arrow functions in expressions</td>
</tr>
<tr>
<td><a href="a7e8abbb7e">a7e8abbb7e</a></td>
<td>fix</td>
<td>correctly handle SkipSelf when resolving from embedded view injector</td>
</tr>
<tr>
<td><a href="0806ee3826">0806ee3826</a></td>
<td>fix</td>
<td>prevent animated element duplication with dynamic components in zoneless mode</td>
</tr>
<tr>
<td><a href="ed78fa05c7">ed78fa05c7</a></td>
<td>fix</td>
<td>Remove note to skip arrow functions in best practices</td>
</tr>
</tbody>
</table>
<h3>forms</h3>
<table>
<thead>
<tr>
<th>Commit</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
</table>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="c2cedd1954"><code>c2cedd1</code></a> refactor(compiler-cli): improve diagnostic with help link</li>
<li><a href="c0cb6040f8"><code>c0cb604</code></a> fix(compiler-cli): detect uninvoked functions in defer trigger expressions</li>
<li><a href="e45a7fe734"><code>e45a7fe</code></a> refactor(compiler-cli): update updateImportClause away from deprecated signature</li>
<li><a href="95b3f37d4a"><code>95b3f37</code></a> feat(compiler): Exhaustive checks for switch blocks</li>
<li><a href="81cabc1477"><code>81cabc1</code></a> feat(core): add support for TypeScript 6</li>
<li><a href="815e1a03a9"><code>815e1a0</code></a> refactor(compiler-cli): Add skeleton tests around source-&gt;source compiler tra...</li>
<li><a href="30f0914754"><code>30f0914</code></a> feat(forms): support binding null to number input (<a href="https://github.com/angular/angular/tree/HEAD/packages/compiler-cli/issues/66917">#66917</a>)</li>
<li><a href="e10a63453d"><code>e10a634</code></a> refactor(compiler-cli): use phaseModifier for type-only import detection</li>
<li><a href="3606902b33"><code>3606902</code></a> refactor(forms): relax <code>[formField]</code> input type from <code>FieldTree</code> to <code>Field</code></li>
<li><a href="e7fa177923"><code>e7fa177</code></a> refactor(compiler-cli): removes <code>reflector</code> parameter from wrapTypeReference</li>
<li>Additional commits viewable in <a href="https://github.com/angular/angular/commits/v21.2.0/packages/compiler-cli">compare view</a></li>
</ul>
</details>
<br />

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2026-03-02 06:49:55 +00:00
..
flutter
Dart 3.9 / Flutter 3.35 [first LLM release] (#2714)
2025-08-14 12:26:24 -07:00
src
Update ng-flutter embedding example to Angular v17 (#2081)
2023-11-08 10:44:27 -08:00
.gitignore
Update Angular embedding sample (#2147)
2024-01-24 15:53:52 -06:00
angular.json
Update ng-flutter embedding example to Angular v17 (#2081)
2023-11-08 10:44:27 -08:00
package.json
Bump @angular/compiler-cli from 20.3.17 to 21.2.0 in /web_embedding/ng-flutter (#2813)
2026-03-02 06:49:55 +00:00
README.md
Update ng-flutter embedding example to Angular v17 (#2081)
2023-11-08 10:44:27 -08:00
tsconfig.app.json
Publish web_embedding (#1777)
2023-05-06 10:53:17 +10:00
tsconfig.json
Publish web_embedding (#1777)
2023-05-06 10:53:17 +10:00
tsconfig.spec.json
Publish web_embedding (#1777)
2023-05-06 10:53:17 +10:00

README.md

ng-flutter

This Angular project is a simple example of how Angular and Flutter web apps could be integrated, and have them interop.

Points of Interest

Angular

This repository is a quite standard Angular app. The following changes were made to be able to use (and interop) with a Flutter web application:

  • package.json has a custom prebuild script that builds the Flutter web app, so Angular can find it later.
  • flutter.js is added as a "scripts" entry in angular.json. Angular takes care of minimizing and injecting it as any other script.
  • The rest of the flutter app flutter/build/web/ is registered as an "assets" entry in angular.json, and moved to /flutter.
  • The ng-flutter component takes care of embedding Flutter web, and yielding control to Angular through an appLoaded EventEmitter. The object yielded by this emitter is a state controller exposed by flutter via a JS custom event!

Flutter

The embedded Flutter application lives in the flutter directory of this repo. That application is a standard web app, that doesn't need to be aware that it's going to be embedded in another framework.

  • Flutter uses new @staticInterop methods to allow certain Dart functions to be called from JavaScript.
  • Look at how createDartExport and broadcastAppEvent work together to make the _state controller of the Flutter app available to Angular!

How to build the app

Requirements

If you want to build and run this demo on your machine, you'll need a moderately recent version of Angular:

$ ng version

Angular CLI: 17.0.0
Node: 20.9.0
Package Manager: npm 10.1.0
OS: linux x64

And Flutter:

$ flutter --version

Flutter 3.13.9 • channel stable
Framework • revision d211f42860 (2 weeks ago) • 2023-10-25 13:42:25 -0700
Engine • revision 0545f8705d
Tools • Dart 3.1.5 • DevTools 2.25.0

Ensure npm, ng and flutter are present in your $PATH.

Building the app

This repository is a moderately standard Angular app. It integrates Flutter web by making it part of the Angular assets.

In order to build this app, first fetch its npm dependencies:

$ npm install

added 963 packages, and audited 964 packages in 17s

93 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

Then run the build script. It'll take care of building Flutter automatically:

$ npm run build

> ng-flutter@0.0.0 prebuild

... Flutter web build output ...

Compiling lib/main.dart for the Web...

> ng-flutter@0.0.0 build
> ng build

... Angular build output ...

✔ Browser application bundle generation complete.
✔ Copying assets complete.
✔ Index html generation complete.

Local Angular development

Once you've reached this point, you should be able to work with your Angular application normally, for example to run a local web server:

$ npm run start

> ng-flutter@0.0.0 start
> ng serve

✔ Browser application bundle generation complete.

Initial Chunk Files   | Names         |  Raw Size
vendor.js             | vendor        |   4.38 MB | 

... Angular build output...

** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **


✔ Compiled successfully.

Navigate to http://localhost:4200/. The application will automatically reload if you change any of its Angular source files.

Local Flutter web development

The Flutter app lives inside the flutter directory, and can be developed independently. Just do any changes on Flutter web as you'd normally do. It even includes a small web/index.html so you can see changes to your app without running the whole Angular setup.

Note

For now, Angular does not auto-detect changes to your Flutter web app, so once you're happy with your Flutter web app, make sure to call npm run build so everything rebuilds and gets placed into its correct location.

Deploying the app

After npm run build, you should have a deployable Angular + Flutter web app in the dist directory of this Angular project.

Your built app can can be deployed anywhere, but do check Firebase hosting for a super-easy deployment experience!

Troubleshooting

Flutter

Ensure your flutter app is properly rebuilt after any changes.

  • Run npm run build to re-build the Flutter app.

If you encounter error messages like:

Error: Can't resolve 'flutter/build/web/flutter.js' in '/my/checkout/of/ng-flutter'

You definitely need to run npm run build!

Reach out to the team(s)!

Have you had any problem not covered in this README? Do you want to see other embedding examples?

Let us know by creating an issue or opening a new pull request.

Thanks!

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