undefined_named_parameter
The named parameter '{0}' isn't defined.
Description
#The analyzer produces this diagnostic when a method or function invocation has a named argument, but the method or function being invoked doesn't define a parameter with the same name.
Example
#The following code produces this diagnostic because m
doesn't declare a named parameter named a
:
class C {
m({int? b}) {}
}
void f(C c) {
c.m(a: 1);
}
Common fixes
#If the argument name is mistyped, then replace it with the correct name. The example above can be fixed by changing a
to b
:
class C {
m({int? b}) {}
}
void f(C c) {
c.m(b: 1);
}
If a subclass adds a parameter with the name in question, then cast the receiver to the subclass:
class C {
m({int? b}) {}
}
class D extends C {
m({int? a, int? b}) {}
}
void f(C c) {
(c as D).m(a: 1);
}
If the parameter should be added to the function, then add it:
class C {
m({int? a, int? b}) {}
}
void f(C c) {
c.m(a: 1);
}
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.