Type Alias visitor

visitor: visitorFn<unknown> | {
    Alias?: visitorFn<Alias>;
    Collection?: visitorFn<YAMLMap | YAMLSeq>;
    Map?: visitorFn<YAMLMap>;
    Node?: visitorFn<
        | Alias
        | Scalar
        | YAMLMap
        | YAMLSeq>;
    Pair?: visitorFn<Pair>;
    Scalar?: visitorFn<Scalar>;
    Seq?: visitorFn<YAMLSeq>;
    Value?: visitorFn<Scalar | YAMLMap | YAMLSeq>;
}