no-equal-switch-expression-cases

added in: 1.5.0

warning

Dart 3.0+

preset: recommended

Warns when a switch expression has cases with equal bodies.

Example

❌ Bad:

class WithField {
  final String field;

  const WithField(this.field);
}

final object = WithField('hello');

final value = switch (object) {
  Object() => 'string literal',
  WithField() => 'string literal', // LINT

  WithField() => object.field,
  (WithField f) => f.field,

  WithField(:final field) => field,
  (WithField(:final field)) => field, // LINT

  Object o => o.toString(),
  dynamic o => o.toString(), // LINT
};

✅ Good:

class WithField {
  final String field;

  const WithField(this.field);
}

final object = WithField('hello');

final value = switch (object) {
  Object() || WithField() => 'string literal',

  WithField() => object.field,
  (WithField f) => f.field,

  WithField(:final field) => field,

  (Object() || WithField()) && final o => o.toString(),
};