async_return_with_no_await

Returning a 'Future' without 'await'.

The analyzer produces this diagnostic when a Future is returned from an async function without using await.

Returning an unawaited Future from an async function means any exception thrown by the Future might not propagate as expected. Having the exception thrown at the await site helps identify the source of the exception and makes it easier to debug.

The following code produces this diagnostic because it returns the Future from futureString without using await:

Future<String> futureString(Future<String> value) async {
  return value;
}

Add await before the returned Future:

Future<String> futureString(Future<String> value) async {
  return await value;
}

If you don't need to use await, then remove async from the function body:

Future<String> futureString(Future<String> value) {
  return value;
}