redeclare_ on_ non_ redeclaring_ member
The {0} doesn't redeclare a {0} declared in a superinterface.
Description
#
The analyzer produces this diagnostic when a member of an extension type
is annotated with
@redeclare
, but none of the implemented interfaces
has a member with the same name.
Example
#
The following code produces this diagnostic because the member
n
declared by the extension type
E
is annotated with
@redeclare
, but
C
doesn't have a member named
n
:
import 'package:meta/meta.dart';
class C {
void m() {}
}
extension type E(C c) implements C {
@redeclare
void n() {}
}
Common fixes
#If the annotated member has the right name, then remove the annotation:
class C {
void m() {}
}
extension type E(C c) implements C {
void n() {}
}
If the annotated member is suppose to replace a member from the implemented interfaces, then change the name of the annotated member to match the member being replaced:
import 'package:meta/meta.dart';
class C {
void m() {}
}
extension type E(C c) implements C {
@redeclare
void m() {}
}
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.