// Type definitions for eslint-visitor-keys 1.0
// Project: https://github.com/eslint/eslint-visitor-keys#readme
// Definitions by: Toru Nagashima <https://github.com/mysticatea>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.2

export interface VisitorKeys {
    readonly [type: string]: ReadonlyArray<string> | undefined;
}

export const KEYS: VisitorKeys;
export function getKeys(node: {}): ReadonlyArray<string>;
export function unionWith(keys: VisitorKeys): VisitorKeys;