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						- type VisitorKeys$1 = {
 -     readonly [type: string]: readonly string[];
 - };
 - /**
 -  * @typedef {{ readonly [type: string]: ReadonlyArray<string> }} VisitorKeys
 -  */
 - /**
 -  * @type {VisitorKeys}
 -  */
 - declare const KEYS: VisitorKeys$1;
 - 
 - /**
 -  * Get visitor keys of a given node.
 -  * @param {object} node The AST node to get keys.
 -  * @returns {readonly string[]} Visitor keys of the node.
 -  */
 - declare function getKeys(node: object): readonly string[];
 - /**
 -  * Make the union set with `KEYS` and given keys.
 -  * @param {VisitorKeys} additionalKeys The additional keys.
 -  * @returns {VisitorKeys} The union set.
 -  */
 - declare function unionWith(additionalKeys: VisitorKeys): VisitorKeys;
 - 
 - type VisitorKeys = VisitorKeys$1;
 - 
 - export { KEYS, VisitorKeys, getKeys, unionWith };
 
 
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