IsEnum<T> function
ValidationRule for isEnum validator.
Implementation
ValidationRule IsEnum<T>(T enumType, {String? message}) => ValidationRule(
message: message,
constraints: [enumType],
validate: (value, arguments) =>
Future(() => isEnum(value, arguments.constraints[0])),
defaultMessage: (arguments) =>
'"$arguments.property" must be a valid enum of "$arguments.constraints[0]"');