deprecated_extend
Extending '{0}' is deprecated.
Description
#The analyzer produces this diagnostic when a class annotated with
@Deprecated.extend
is used in the extends
clause of a class
declaration.
This annotation indicates that the ability for classes to extend the
annotated class is deprecated, and will soon be removed, perhaps by
marking the annotated class with interface
, final
, or sealed
.
Example
#If the library p
defines a class annotated with @Deprecated.extend
:
dart
@Deprecated.extend()
class C {}
Then, the following code, when in a library other than p
, produces this
diagnostic:
dart
import 'package:p/p.dart';
class D extends C {}
Common fixes
#Follow any directions found in the Deprecation.extend
annotation, or
just remove the extends
clause.
dart
class D {}