|  | 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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