Method getDirectory

js/src/index.ts:793–821

(
    source: Source,
    offset: number,
    length: number,
    header: Header
  )

  }

  async getDirectory(
    source: Source,
    offset: number,
    length: number,
    header: Header
  ): Promise<Entry[]> {
    const cacheKey = `${source.getKey()}|${
      header.etag || ""
    }|${offset}|${length}`;
    const cacheValue = this.cache.get(cacheKey);
    if (cacheValue) {
      cacheValue.lastUsed = this.counter++;
      const data = await cacheValue.data;
      return data as Entry[];
    }

    const p = new Promise<Entry[]>((resolve, reject) => {
      getDirectory(source, this.decompress, offset, length, header)
        .then((directory) => {
          resolve(directory);
          this.prune();
        })
        .catch((e) => {
          reject(e);
        });
    });
    this.cache.set(cacheKey, { lastUsed: this.counter++, data: p });
    return p;
  }

  prune() {
    if (this.cache.size >= this.maxCacheEntries) {