Method has

lib/web/cache/cachestorage.js:60–71

* @see https://w3c.github.io/ServiceWorker/#cache-storage-has * @param {string} cacheName * @returns {Promise }

(cacheName)

   * @returns {Promise<boolean>}
   */
  async has (cacheName) {
    webidl.brandCheck(this, CacheStorage)

    const prefix = 'CacheStorage.has'
    webidl.argumentLengthCheck(arguments, 1, prefix)

    cacheName = webidl.converters.DOMString(cacheName, prefix, 'cacheName')

    // 2.1.1
    // 2.2
    return this.#caches.has(cacheName)
  }

  /**
   * @see https://w3c.github.io/ServiceWorker/#dom-cachestorage-open