Squashed commit of the following:

commit da1dd5d
Author: Devon Carew <devoncarew@google.com>
Date:   Thu Jul 24 10:24:40 2025 -0700

    switch CI to using workflow files (dart-lang#428)

    * switch CI to using workflow files

    * update the sdk matrix

    * review feedback

    * remove format sdk version check

commit 8ffaf5e
Author: Nikechukwu <150845642+nikeokoronkwo@users.noreply.github.com>
Date:   Wed Jul 23 12:17:55 2025 -0400

    [interop] Implement Diagnostics and Handling Errors (dart-lang#426)

    * implemented diagnostics

    * added extra invalid semantic

Author: nikeokoronkwo

.github/workflows/dart.yml

@@ -0,0 +1,44 @@
+name: package:web
+permissions: read-all
+
+on:
+  # Run CI on pushes to the main branch and on PRs.
+  push:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/web.yaml'
+      - 'web/**'
+  pull_request:
+    paths:
+      - '.github/workflows/web.yaml'
+      - 'web/**'
+  schedule:
+    - cron: "0 0 * * 0"
+
+defaults:
+  run:
+    working-directory: web/
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk: [3.4, beta, dev]
+        test_config: ['-p chrome', '-p chrome -c dart2wasm']
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c
+        with:
+          sdk: ${{ matrix.sdk }}
+
+      - run: dart pub get
+      - run: dart format --output=none --set-exit-if-changed .
+        if: ${{ matrix.sdk == 'dev' }}
+      - run: dart analyze --fatal-infos
+      - run: dart test ${{ matrix.test_config }}
+
+      # Validate the 'dart fix' metadata.
+      - run: dart fix --compare-to-golden test_fixes

.github/workflows/web.yaml

@@ -0,0 +1,66 @@
+name: package:web_generator
+permissions: read-all
+
+on:
+  # Run CI on pushes to the main branch and on PRs.
+  push:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/web_generator.yaml'
+      - 'web_generator/**'
+  pull_request:
+    paths:
+      - '.github/workflows/web_generator.yaml'
+      - 'web_generator/**'
+  schedule:
+    - cron: "0 0 * * 0"
+
+defaults:
+  run:
+    working-directory: web_generator/
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk: [dev]
+        test_config: ['', '-p chrome', '-p chrome -c dart2wasm']
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c
+        with:
+          sdk: ${{ matrix.sdk }}
+
+      - run: dart pub get
+      - run: dart format --output=none --set-exit-if-changed .
+      - run: dart analyze --fatal-infos
+      - run: dart test ${{ matrix.test_config }}
+
+  # test bin/update_idl_bindings.dart
+  test_generate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c
+
+      - run: dart pub get
+      - run: dart pub -C ../web get
+      - run: dart bin/update_idl_bindings.dart
+      - run: dart analyze --fatal-infos ../web
+
+  # test bin/update_idl_bindings.dart --generate-all
+  test_generate_all:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c
+
+      - run: dart pub get
+      - run: dart pub -C ../web get
+      - run: dart bin/update_idl_bindings.dart --generate-all
+      - run: dart analyze --fatal-infos ../web

.github/workflows/web_generator.yaml

@@ -31,6 +31,17 @@ Future<void> compileDartMain({String? langVersion, String? dir}) async {
   );
 }
 
+Future<Process> runProcWithResult(String executable, List<String> arguments,
+    {required String workingDirectory}) async {
+  print(ansi.styleBold.wrap(['*', executable, ...arguments].join(' ')));
+  return Process.start(
+    executable,
+    arguments,
+    runInShell: Platform.isWindows,
+    workingDirectory: workingDirectory,
+  );
+}
+
 Future<void> runProc(String executable, List<String> arguments,
     {required String workingDirectory, bool detached = false}) async {
   print(ansi.styleBold.wrap(['*', executable, ...arguments].join(' ')));

mono_repo.yaml

@@ -4,6 +4,7 @@
 
 import 'dart:js_interop';
 
+import '../js/node.dart';
 import '../js/typescript.dart' as ts;
 
 class ParserResult {
@@ -13,9 +14,35 @@ class ParserResult {
   ParserResult({required this.program, required this.files});
 }
 
+/// Parses the given TypeScript declaration [files], provides any diagnostics,
+/// if any, and generates a [ts.TSProgram] for transformation
 ParserResult parseDeclarationFiles(Iterable<String> files) {
   final program = ts.createProgram(files.jsify() as JSArray<JSString>,
       ts.TSCompilerOptions(declaration: true));
 
+  // get diagnostics
+  final diagnostics = [
+    ...program.getSemanticDiagnostics().toDart,
+    ...program.getSyntacticDiagnostics().toDart,
+    ...program.getDeclarationDiagnostics().toDart,
+  ];
+
+  // handle diagnostics
+  for (final diagnostic in diagnostics) {
+    if (diagnostic.file case final diagnosticFile?) {
+      final ts.TSLineAndCharacter(line: line, character: char) =
+          ts.getLineAndCharacterOfPosition(diagnosticFile, diagnostic.start!);
+      final message =
+          ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
+      printErr('${diagnosticFile.fileName} '
+          '(${line.toDartInt + 1},${char.toDartInt + 1}): $message');
+    }
+  }
+
+  if (diagnostics.isNotEmpty) {
+    // exit
+    exit(1);
+  }
+
   return ParserResult(program: program, files: files);
 }

tool/ci.sh

@@ -6,3 +6,9 @@ import 'dart:js_interop';
 
 @JS()
 external String get url;
+
+@JS('process.exit')
+external void exit(int code);
+
+@JS('console.error')
+external void printErr(String message);