Contents

overridden_fields

Contents

Don't override fields.

This rule is available as of Dart 2.0.

Rule sets: recommended, flutter

Details

#

DON'T override fields.

Overriding fields is almost always done unintentionally. Regardless, it is a bad practice to do so.

BAD:

dart
class Base {
  Object field = 'lorem';

  Object something = 'change';
}

class Bad1 extends Base {
  @override
  final field = 'ipsum'; // LINT
}

class Bad2 extends Base {
  @override
  Object something = 'done'; // LINT
}

GOOD:

dart
class Base {
  Object field = 'lorem';

  Object something = 'change';
}

class Ok extends Base {
  Object newField; // OK

  final Object newFinal = 'ignore'; // OK
}

GOOD:

dart
abstract class BaseLoggingHandler {
  Base transformer;
}

class LogPrintHandler implements BaseLoggingHandler {
  @override
  Derived transformer; // OK
}

Usage

#

To enable the overridden_fields rule, add overridden_fields under linter > rules in your analysis_options.yaml file:

analysis_options.yaml
yaml
linter:
  rules:
    - overridden_fields

Unless stated otherwise, the documentation on this site reflects Dart 3.5.4. Page last updated on 2024-07-03. View source or report an issue.