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prefer-initializing-formals

v1.38.0
style
effort: 2m
has IDE fix
has auto-fix
pro+

Suggests using initializing formal parameters when applicable.

Example​

❌ Bad:

class Some {
  final String value;
  final String another;

  const Some(String val, {required String named})
      // LINT: Use an initializing formal to assign a parameter to a field.
      //  Try using 'this.value' to initialize the field.
    : value = val,
      another = named;
}

class Another {
  final String _val;

  // LINT: Use an initializing formal to assign a parameter to a field.
  //  Try using 'this.value' to initialize the field.
  const Another(String _value) : _val = _value;
}

✅ Good:

class Some {
  final String value;
  final String another;

  const Some(this.value, {required String named}) : another = named;
}

class Another {
  final String _val;

  const Another(this._value);
}
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