avoid-passing-async-when-sync-expected

added in: 1.6.0 warning

Avoid passing asynchronous function as an argument where a synchronous function is expected.

note

For this rule it's recommended to exclude the test folder.

Example

Bad:

void doSomethingWithCallback(VoidCallback function) {
  ...
  function();
  ...
}

void main() {
  doSomethingWithCallback(() async {
    await Future.delayed(Duration(seconds: 1));
    print('Hello World');
  });
}

Good:

void doSomethingWithCallback(VoidCallback function) {
  ...
  function();
  ...
}

void main() {
  doSomethingWithCallback(() {
    print('Hello World');
  });
}