Interface SetInterval

interface SetInterval {
    __promisify__: SetIntervalPromise;
    "[promisifySymbol]": SetIntervalPromise;
    (f: (a: void) => any, n?: number): Timer;
    <TArgs extends any[]>(
        f: (...a: TArgs) => any,
        n?: number,
        ...a: TArgs,
    ): Timer;
}