prefer-async-await

added in: 1.0.0 style

Recommends to use async/await syntax to handle Futures result instead of .then() invocation. Also can help prevent errors with mixed await and .then() usages, since awaiting the result of a Future with .then() invocation awaits the completion of .then().

Example

Bad:

Future<void> main() async {
  someFuture.then((result) => handleResult(result)); // LINT

  await (foo.asyncMethod()).then((result) => handleResult(result)); // LINT
}

Good:

Future<void> main() async {
  final result = await someFuture;
  handleResult(result);

  final anotherResult = await foo.asyncMethod();
  handleResult(anotherResult);
}