export type Entry<Args, R> = {
    args: Args;
    resolve: (value: R | PromiseLike<R>) => void;
    reject: (err: unknown) => void;
};
export type SerialQueue<Args extends unknown[], R> = {
    f: (...args: Args) => Promise<R>;
    entries: Entry<Args, R>[];
    /**
     * Called after the last entry settled (or after `rejectAll`). Errors thrown
     * by the hook are rethrown asynchronously as uncaught exceptions; they never
     * affect the entries or the queue.
     */
    drained?: () => void;
    /** Entry whose `f` is currently in flight, if any. */
    running?: Entry<Args, R>;
};