prefer-immutable-selector-value

v1.30.0

warning

effort: 3m

teams+

Warns when a Selector return a mutable value.

Returning a mutable value can lead to skipped or incorrect rebuilds. Instead, always return an immutable value.

Example

❌ Bad:

// LINT: Prefer returning immutable values from selector to avoid skipped or incorrect rebuilds.
Selector(selector: (context, object) => SomeClass());

// LINT: Prefer returning immutable values from selector to avoid skipped or incorrect rebuilds.
Selector2(selector: (context, object, another) => SomeClass());

class SomeClass {}

✅ Good:

Selector(selector: (context, object) => SomeClass());

Selector2(selector: (context, object, another) => SomeClass());

@immutable
class SomeClass {
  @override
  int get hashCode => ...;

  @override
  bool operator ==(Object other) => ...;
}

Additional Resources

• https://pub.dev/documentation/provider/latest/provider/Selector-class.html