--- /dev/null
+// 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;