Add TodoMVC for dart2js & dart2wasm

experimental/todomvc-dart-jaspr/.gitignore

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+.dart_tool/
+build/

experimental/todomvc-dart-jaspr/README.md

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+# TodoMVC: Dart Jaspr
+
+## Description
+This is a TodoMVC app written in Dart using the Jaspr DOM framework. It can be
+compiled to either JavaScript or WebAssembly (with GC extension).
+
+## Setup
+
+Install [dart](https://dart.dev/get-dart) and fetch dependencies using `dart pub get`.
+
+## Running the project
+
+Run your project using `dart run jaspr_cli:jaspr serve`.
+
+The development server will be available on `http://localhost:8080`.
+
+## Building the project
+
+Build your project using either:
+
+-   Generate JavaScript via: `dart run jaspr_cli:jaspr build -O4 --extra-js-compiler-option=--no-minify`
+-   Generate WebAssembly via: `dart run jaspr_cli:jaspr build -O2 --experimental-wasm --extra-wasm-compiler-option=--no-strip-wasm`
+
+The output will be located inside the `build/jaspr/` directory.
+
+## Updating the checked-in build artifacts
+To update the checked-in artifacts in the `dist/` directory, run
+
+```
+./build.sh 2>&1 | tee build.log
+```

experimental/todomvc-dart-jaspr/analysis_options.yaml

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+include: package:lints/recommended.yaml
+
+analyzer:
+    # Jaspr has a custom lint package 'jaspr_lints', which needs the 'custom_lint' analyzer plugin.
+    #
+    # Unfortunately, running 'dart analyze' does not pick up the custom lints. Instead, you need to
+    # run a separate command for this: `jaspr analyze`
+    plugins:
+        - custom_lint

experimental/todomvc-dart-jaspr/build.log

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++ set -e
++ echo 'Current Dart SDK version'
+Current Dart SDK version
++ dart --version
+Dart SDK version: 3.9.0-333.0.dev (dev) (Fri Jul 11 09:03:09 2025 -0700) on "macos_arm64"
++ echo 'Fetching dependencies'
+Fetching dependencies
++ dart pub get
+Resolving dependencies...
+Downloading packages...
+  _fe_analyzer_shared 82.0.0 (85.0.0 available)
+  analyzer 7.4.5 (7.5.7 available)
+  analyzer_plugin 0.13.1 (0.13.4 available)
+  dds 4.2.7 (5.0.4 available)
+  devtools_shared 10.0.2 (12.0.0 available)
+  dtd 2.5.1 (4.0.0 available)
+  dwds 24.3.5 (24.4.0 available)
+  json_rpc_2 3.0.3 (4.0.0 available)
+  mime 1.0.6 (2.0.0 available)
+  shelf_web_socket 2.0.1 (3.0.0 available)
+  vm_service 14.3.1 (15.0.2 available)
+  webdev 3.7.1 (3.7.2 available)
+Got dependencies!
+12 packages have newer versions incompatible with dependency constraints.
+Try `dart pub outdated` for more information.
++ echo 'Building dart2js version in -O4'
+Building dart2js version in -O4
++ rm -rf build dist/out-dart2js-O4
++ dart run jaspr_cli:jaspr build -O4 --extra-js-compiler-option=--disable-program-split
+Building jaspr for client rendering mode.
+⠋ Building web assets......⠙ Building web assets...... (1ms)✓ Completed building web assets. (11.8s)
+Completed building project to /build/jaspr.
++ mkdir -p dist/out-dart2js-O4
++ cp build/jaspr/index.html build/jaspr/base.css build/jaspr/index.css build/jaspr/favicon.ico build/jaspr/main.dart.js dist/out-dart2js-O4
++ echo 'Building dart2js version in -O4'
+Building dart2js version in -O4
++ rm -rf build dist/out-dart2wasm-O2
++ dart run jaspr_cli:jaspr build -O2 --experimental-wasm
+Building jaspr for client rendering mode.
+⠋ Building web assets......⠙ Building web assets...... (1ms)✓ Completed building web assets. (12.4s)
+Completed building project to /build/jaspr.
++ mkdir -p dist/out-dart2wasm-O2
++ cp build/jaspr/index.html build/jaspr/base.css build/jaspr/index.css build/jaspr/favicon.ico build/jaspr/main.dart.js build/jaspr/main.mjs build/jaspr/main.wasm dist/out-dart2wasm-O2

experimental/todomvc-dart-jaspr/build.sh

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+#!/bin/bash
+
+JS_OUT=dist/out-dart2js-O4
+WASM_OUT=dist/out-dart2wasm-O2
+
+set -x
+set -e
+
+echo "Current Dart SDK version"
+dart --version
+
+echo "Fetching dependencies"
+dart pub get
+
+# NOTE: For profiling add the following argument to get symbols
+#   --extra-js-compiler-option=--no-minify
+echo "Building dart2js version in -O4"
+rm -rf build $JS_OUT
+dart run jaspr_cli:jaspr build -O4 --extra-js-compiler-option=--disable-program-split
+mkdir -p $JS_OUT
+cp build/jaspr/{index.html,base.css,index.css,favicon.ico,main.dart.js} $JS_OUT
+
+# NOTE: For profiling add the following argument to get symbols
+#   --extra-wasm-compiler-option=--no-strip-wasm
+echo "Building dart2js version in -O4"
+rm -rf build $WASM_OUT
+dart run jaspr_cli:jaspr build -O2 --experimental-wasm 
+mkdir -p $WASM_OUT
+cp build/jaspr/{index.html,base.css,index.css,favicon.ico,main.dart.js,main.mjs,main.wasm} $WASM_OUT

experimental/todomvc-dart-jaspr/dist/out-dart2js-O4/base.css

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+hr {
+    margin: 20px 0;
+    border: 0;
+    border-top: 1px dashed #c5c5c5;
+    border-bottom: 1px dashed #f7f7f7;
+}
+
+.learn a {
+    font-weight: normal;
+    text-decoration: none;
+    color: #b83f45;
+}
+
+.learn a:hover {
+    text-decoration: underline;
+    color: #787e7e;
+}
+
+.learn h3,
+.learn h4,
+.learn h5 {
+    margin: 10px 0;
+    font-weight: 500;
+    line-height: 1.2;
+    color: #000;
+}
+
+.learn h3 {
+    font-size: 24px;
+}
+
+.learn h4 {
+    font-size: 18px;
+}
+
+.learn h5 {
+    margin-bottom: 0;
+    font-size: 14px;
+}
+
+.learn ul {
+    padding: 0;
+    margin: 0 0 30px 25px;
+}
+
+.learn li {
+    line-height: 20px;
+}
+
+.learn p {
+    font-size: 15px;
+    font-weight: 300;
+    line-height: 1.3;
+    margin-top: 0;
+    margin-bottom: 0;
+}
+
+#issue-count {
+    display: none;
+}
+
+.quote {
+    border: none;
+    margin: 20px 0 60px 0;
+}
+
+.quote p {
+    font-style: italic;
+}
+
+.quote p:before {
+    content: "“";
+    font-size: 50px;
+    opacity: 0.15;
+    position: absolute;
+    top: -20px;
+    left: 3px;
+}
+
+.quote p:after {
+    content: "”";
+    font-size: 50px;
+    opacity: 0.15;
+    position: absolute;
+    bottom: -42px;
+    right: 3px;
+}
+
+.quote footer {
+    position: absolute;
+    bottom: -40px;
+    right: 0;
+}
+
+.quote footer img {
+    border-radius: 3px;
+}
+
+.quote footer a {
+    margin-left: 5px;
+    vertical-align: middle;
+}
+
+.speech-bubble {
+    position: relative;
+    padding: 10px;
+    background: rgba(0, 0, 0, 0.04);
+    border-radius: 5px;
+}
+
+.speech-bubble:after {
+    content: "";
+    position: absolute;
+    top: 100%;
+    right: 30px;
+    border: 13px solid transparent;
+    border-top-color: rgba(0, 0, 0, 0.04);
+}
+
+.learn-bar > .learn {
+    position: absolute;
+    width: 272px;
+    top: 8px;
+    left: -300px;
+    padding: 10px;
+    border-radius: 5px;
+    background-color: rgba(255, 255, 255, 0.6);
+    transition-property: left;
+    transition-duration: 500ms;
+}
+
+@media (min-width: 899px) {
+    .learn-bar {
+        width: auto;
+        padding-left: 300px;
+    }
+
+    .learn-bar > .learn {
+        left: 8px;
+    }
+}