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avoid-passing-async-when-sync-expected

added in: 1.6.0
warning
Pro+
preset: recommended

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

✅ Good:

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

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