Method enqueue

packages/runtime/src/async-queue.ts:72–82

(item: T)

  }

  private enqueue(item: T): number {
    const sequence = ++this.pushedCount;
    const w = this.waiters.shift();
    if (w) {
      w.resolve({ value: item, done: false });
    } else {
      this.buf.push(item);
    }
    this.wake();
    return sequence;
  }

  private async waitUntilConsumed(sequence: number): Promise<void> {
    while (this.consumedCount < sequence) {