invalid_modifier_on_setter
Setters can't use 'async', 'async*', or 'sync*'.
Description
#The analyzer produces this diagnostic when the body of a setter is prefixed by one of the following modifiers: async
, async*
, or sync*
. Setter bodies must be synchronous.
Example
#The following code produces this diagnostic because the body of the setter x
is marked as being async
:
class C {
set x(int i) async {}
}
Common fixes
#If the setter can be synchronous, then remove the modifier:
class C {
set x(int i) {}
}
If the setter can't be synchronous, then use a method to set the value instead:
class C {
void x(int i) async {}
}
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.