initializer_for_non_existent_field

'{0}' isn't a field in the enclosing class.

The analyzer produces this diagnostic when a constructor initializes a field that isn't declared in the class containing the constructor. Constructors can't initialize fields that aren't declared and fields that are inherited from superclasses.

The following code produces this diagnostic because the initializer is initializing x, but x isn't a field in the class:

class C {
  int? y;

  C() : x = 0;
}

If a different field should be initialized, then change the name to the name of the field:

class C {
  int? y;

  C() : y = 0;
}

If the field must be declared, then add a declaration:

class C {
  int? x;
  int? y;

  C() : x = 0;
}

Unless stated otherwise, the documentation on this site reflects Dart 3.8.1. Page last updated on 2025-05-08. View source or report an issue.