avoid-unrelated-type-casts

added in: 1.0.0

warning

preset: recommended

Warns about unrelated usages of as operator.

Example

❌ Bad:

class Animal {}

class HomeAnimal extends Animal {}

class NotAnimal {}

class Example {
  final regularString = '';
  final myList = <int>[1, 2, 3];

  final Animal animal = Animal();

  void main() {
    final result = regularString as int; // LINT
    final result2 = myList as List<String>; // LINT

    final result3 = animal as NotAnimal; // LINT
  }

  void patterns() {
    final animal = Animal();

    if (animal case Animal() as HomeAnimal) {}
    if (animal case Animal() as NotAnimal) {} // LINT
  }
}

✅ Good:

class Animal {}

class HomeAnimal extends Animal {}

class Example {
  final regularString = '';
  final myList = <int>[1, 2, 3];

  final Animal animal = Animal();

  void main() {
    final result = regularString;
    final result2 = myList;

    final result3 = animal;
  }

  void patterns() {
    final animal = Animal();

    if (animal case Animal() as HomeAnimal) {}
  }
}