non_void_return_for_operator
The return type of the operator []= must be 'void'.
Description
#The analyzer produces this diagnostic when a declaration of the operator []=
has a return type other than void
.
Example
#The following code produces this diagnostic because the declaration of the operator []=
has a return type of int
:
dart
class C {
int operator []=(int index, int value) => 0;
}
Common fixes
#Change the return type to void
:
dart
class C {
void operator []=(int index, int value) => 0;
}
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.