invalid_override_of_non_virtual_member
The member '{0}' is declared non-virtual in '{1}' and can't be overridden in subclasses.
Description
#The analyzer produces this diagnostic when a member of a class, mixin, or enum overrides a member that has the @nonVirtual
annotation on it.
Example
#The following code produces this diagnostic because the method m
in B
overrides the method m
in A
, and the method m
in A
is annotated with the @nonVirtual
annotation:
import 'package:meta/meta.dart';
class A {
@nonVirtual
void m() {}
}
class B extends A {
@override
void m() {}
}
Common fixes
#If the annotation on the method in the superclass is correct (the method in the superclass is not intended to be overridden), then remove or rename the overriding method:
import 'package:meta/meta.dart';
class A {
@nonVirtual
void m() {}
}
class B extends A {}
If the method in the superclass is intended to be overridden, then remove the @nonVirtual
annotation:
class A {
void m() {}
}
class B extends A {
@override
void m() {}
}
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.