super_in_extension
The 'super' keyword can't be used in an extension because an extension doesn't have a superclass.
Description
#The analyzer produces this diagnostic when a member declared inside an extension uses the super
keyword . Extensions aren't classes and don't have superclasses, so the super
keyword serves no purpose.
Example
#The following code produces this diagnostic because super
can't be used in an extension:
extension E on Object {
String get displayString => super.toString();
}
Common fixes
#Remove the super
keyword :
extension E on Object {
String get displayString => toString();
}
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.