Function unshift

packages/browser/src/transports/offline.ts:72–84

(store: Store, value: Uint8Array | string, maxQueueSize: number)

/** Insert into the front of the store */
export function unshift(store: Store, value: Uint8Array | string, maxQueueSize: number): Promise<void> {
  return store(store => {
    return keys(store).then(keys => {
      if (keys.length >= maxQueueSize) {
        return;
      }

      // We insert with an decremented key so that the entries are popped in order
      store.put(value, Math.min(...keys, 0) - 1);
      return promisifyRequest(store.transaction);
    });
  });
}

/** Pop the oldest value from the store */
export function shift(store: Store): Promise<Uint8Array | string | undefined> {