Dart 2 migration guide for web apps

• :
  • Chrome replaces Dartium and content-shell.
  • A new build system replaces , pub serve, pub transformers.
• Dart 2 language and library changes.

See also:

The development environment for web apps is different in Dart 2 from Dart 1.x.Here are the highlights:

• HTML files with <script src="foo.dart"…> elements,such as . See details below.
• Dart code, due to changes in the

For complete examples of migrated apps, compare the 4.x and master branchesof any one of the angular-examples apps, such as these:

• Tour of Heroes, part 5

Make these changes to your pubspec.yaml file:

• Add new dev_dependencies:
  • build_runner:
  • build_test: , if you are running tests
  • build_web_compilers:
• Drop dev_dependencies:
• Upgrade to test version 0.12.30 or later; it runs Chrome tests headless by default.
• Drop all transformers:
  • angular
  • dart_to_js_script_rewriter
  • test/pub_serve

HTML with script elements

The most common example of a file with <script> elements is web/index.html.You’ll need to make these changes:

• Drop <script defer src="packages/browser/dart.js"></script>
• Replace <script defer src="foo.dart" type="application/dart"></script> by

• Dart 2 Updates:Information about changes in Dart 2, and how to migrate your code from Dart 1.x.