/** Serialize local saves so each request reads the revision returned by the last. */
export function createCanvasSaveQueue() {
  let pending: Promise<unknown> = Promise.resolve();
  return {
    enqueue<T>(save: () => Promise<T>): Promise<T> {
      const next = pending.then(save, save);
      pending = next.catch(() => undefined);
      return next;
    },
  };
}