import type { AnyTxtNode, TxtNode, TxtParentNode } from "@textlint/ast-node-types";
export declare class TxtElement {
    node: AnyTxtNode | null;
    constructor(node: AnyTxtNode | null);
}
declare const VisitorOption: {
    Break: {};
    Skip: {};
};
declare class Controller {
    private __worklist;
    private __leavelist;
    private __current;
    private __willStartTraverse;
    private __execute;
    /**
     * Gets parent nodes of current node.
     * The parent nodes are returned in order from the closest parent to the outer ones.
     * Current node is {@link current}.
     * @returns {Array}
     * @public
     */
    parents(): TxtNode[];
    /**
     * Gets current node during traverse.
     * @returns {TxtNode|null}
     * @public
     */
    current(): TxtNode | null;
    /**
     * Traverse AST with visitor
     * @param {TxtParentNode} root
     * @param {Visitor} visitor
     */
    traverse(root: TxtParentNode, visitor: Visitor): void;
}
export type Visitor = {
    enter?(node: TxtNode, parent?: TxtParentNode): unknown | void;
    leave?(node: TxtNode, parent?: TxtParentNode): unknown | void;
};
declare function traverse(root: TxtParentNode, visitor: Visitor): void;
export { Controller, traverse, VisitorOption };
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