function-always-returns-null

added in: 1.4.0

warning

⚙️

preset: recommended

Warns when a function with nullable return type returns only null.

⚙️ Config

Set ignored-invocations (default is none) to ignore function expressions within specific function invocations.

dart_code_metrics:
  ...
  rules:
    ...
    - function-always-returns-null:
        ignored-invocations:
          - useCallback

Example

❌ Bad:

// LINT
String? function() {
  if (value == 2) {
    // ...
  }

  return null;
}

✅ Good:

String? function() {
  if (value == 2) {
    // ...

    return 'some string';
  }

  return null;
}