empty method

AbstractRuleBuilder empty({
  1. String? message,
})

Checks if the object a string and is empty

Implementation

AbstractRuleBuilder empty({String? message}) {
  return must(
      (dynamic dyn) => dyn is String && dyn.isEmpty,
      message != null
          ? message
          : useKeyAsElementName
              ? '$key must be empty'
              : "String must be empty",
      code: "notEmpty");
}