Function enqueue

Web/script.js:106–120

(key, requestFn)

  maxConcurrent: 4,

  async enqueue(key, requestFn) {
    if (this.queue.has(key)) {
      return this.queue.get(key);
    }
    while (this.queue.size >= this.maxConcurrent) {
      await new Promise((resolve) => setTimeout(resolve, 50));
    }

    const promise = requestFn().finally(() => {
      this.queue.delete(key);
    });

    this.queue.set(key, promise);
    return promise;
  },
};
const indexCache = {
  data: new Map(),