const_constructor_with_non_final_field
Can't define a const constructor for a class with non-final fields.
Description
#The analyzer produces this diagnostic when a constructor is marked as a const constructor, but the constructor is defined in a class that has at least one non-final instance field (either directly or by inheritance).
Example
#The following code produces this diagnostic because the field x
isn't final:
class C {
int x;
const C(this.x);
}
Common fixes
#If it's possible to mark all of the fields as final, then do so:
class C {
final int x;
const C(this.x);
}
If it isn't possible to mark all of the fields as final, then remove the keyword const
from the constructor:
class C {
int x;
C(this.x);
}
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.