undefined_enum_constant

There's no constant named '{0}' in '{1}'.

The analyzer produces this diagnostic when it encounters an identifier that appears to be the name of an enum value, and the name either isn't defined or isn't visible in the scope in which it's being referenced.

The following code produces this diagnostic because E doesn't define a constant named c:

enum E {a, b}

var e = E.c;

If the constant should be defined, then add it to the declaration of the enum:

enum E {a, b, c}

var e = E.c;

If the constant shouldn't be defined, then change the name to the name of an existing constant:

enum E {a, b}

var e = E.b;

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.