forwardRef function
Creates a forward reference to a validator. Use this when you need to reference a validator before it's fully defined.
Example:
late Validator foobar;
foobar = l.schema({
'foo': l.string().required(),
'bar': l.list(validators: [forwardRef(() => foobar.required())]),
});
Implementation
_ForwardRef forwardRef(Validator Function() resolver) {
return _ForwardRef(resolver);
}