late_final_field_with_const_constructor

Can't have a late final field in a class with a generative const constructor.

The analyzer produces this diagnostic when a class that has at least one const constructor also has a field marked both late and final.

The following code produces this diagnostic because the class A has a const constructor and the final field f is marked as late:

class A {
  late final int f;

  const A();
}

If the field doesn't need to be marked late, then remove the late modifier from the field:

class A {
  final int f = 0;

  const A();
}

If the field must be marked late, then remove the const modifier from the constructors:

class A {
  late final int f;

  A();
}

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.