prefer_const_constructors_in_immutables
Constructors in '@immutable' classes should be declared as 'const'.
Description
#The analyzer produces this diagnostic when a non-const
constructor is
found in a class that has the @immutable
annotation.
Example
#The following code produces this diagnostic because the constructor in C
isn't declared as const
even though C
has the @immutable
annotation:
dart
import 'package:meta/meta.dart';
@immutable
class C {
final f;
C(this.f);
}
Common fixes
#If the class really is intended to be immutable, then add the const
modifier to the constructor:
dart
import 'package:meta/meta.dart';
@immutable
class C {
final f;
const C(this.f);
}
If the class is mutable, then remove the @immutable
annotation:
dart
class C {
final f;
C(this.f);
}