Interface Visitors

interface Visitors {
    Alternative?:
        | TraversalCallback<Alternative>
        | TraversalCallbacks<Alternative>;
    Assertion?: TraversalCallback<Assertion> | TraversalCallbacks<Assertion>;
    Backreference?:
        | TraversalCallback<Backreference>
        | TraversalCallbacks<Backreference>;
    Char?: TraversalCallback<Char> | TraversalCallbacks<Char>;
    CharacterClass?:
        | TraversalCallback<CharacterClass>
        | TraversalCallbacks<CharacterClass>;
    ClassRange?: TraversalCallback<ClassRange> | TraversalCallbacks<ClassRange>;
    Disjunction?:
        | TraversalCallback<Disjunction>
        | TraversalCallbacks<Disjunction>;
    every?: TraversalCallback | TraversalCallbacks<AstNode>;
    Group?: TraversalCallback<Group> | TraversalCallbacks<Group>;
    Quantifier?: TraversalCallback<Quantifier> | TraversalCallbacks<Quantifier>;
    RegExp?: TraversalCallback<AstRegExp> | TraversalCallbacks<AstRegExp>;
    Repetition?: TraversalCallback<Repetition> | TraversalCallbacks<Repetition>;
}