avoid-duplicate-switch-case-conditions

added in: 1.11.0

warning

Dart 3.0+

preset: recommended

Warns when several switch cases have the same condition.

Example

❌ Bad:

void fn(SomeClass param) {
  final value = switch (param) {
    Sub() when param.value.isEmpty => 1, // LINT
    Sub() when param.value.isEmpty => 2, // LINT
    _ => 3,
  };
}

class SomeClass {
  final String value;

  const SomeClass(this.value);
}

class Sub extends SomeClass {
  const Sub(super.value);
}

✅ Good:

void fn(SomeClass param) {
  final value = switch (param) {
    Sub() when param.value.isEmpty => 1,
    Sub() when param.value.length == 2 => 2,
    _ => 3,
  };
}

class SomeClass {
  final String value;

  const SomeClass(this.value);
}

class Sub extends SomeClass {
  const Sub(super.value);
}