Invalid use of class with constructor as a mixinDRT-W1488
The analyzer produces this diagnostic when a class is used as a mixin and the mixed-in class defines a constructor.
Example
The following code produces this diagnostic because the class A
, which
defines a constructor, is being used as a mixin:
//@dart=2.19
class A {
A();
}
class B with A {}
Common fixes
If it's possible to convert the class to a mixin, then do so:
mixin A {
}
class B with A {}
If the class can't be a mixin and it's possible to remove the constructor, then do so:
//@dart=2.19
class A {
}
class B with A {}
If the class can't be a mixin and you can't remove the constructor, then try extending or implementing the class rather than mixing it in:
class A {
A();
}
class B extends A {}