avoid-type-casts

added in: 1.22.0

warning

⚙️

Pro+

Warns about any usages of the as operator.

⚙️ Config

Set only-dynamic (default is false) to highlight only type casts for variables with the dynamic type.

dart_code_metrics:
  ...
  rules:
    - avoid-type-casts:
        only-dynamic: false

Example

❌ Bad:

void fn() {
  dynamic a = 3;
  final s = a as String; // LINT

  int b = 2;

  final s = b as String; // LINT
  if (b case String() as Object) {} // LINT
}

✅ Good:

void fn(List<String> values) {
  dynamic a = 3;
  if (a is String) {
    ...
  }
}