Use Dart 1.9 for native support for async/await/sync/async/yield.**
A prototype (and in progress) implementation of async/await in Dart, via CPS translation.
This transformer is useful for trying async/await with dart2js. The Dart VM natively supports async and await. If you are writing Dart code that runs only in the VM, you do not need this transformer.
Add this to your pubspec.yaml file:
dependencies: async_await: git: https://github.com/dart-lang/async_await.git transformers: - async_await
Import dart:async in your Dart file:
See also the open issues.