async install()

in workbox-v4.3.1/workbox-precaching.dev.js [316:362]
42 lines of code
4 McCabe index (conditional complexity)

    async install({
      event,
      plugins
    } = {}) {
      {
        if (plugins) {
          assert_mjs.assert.isArray(plugins, {
            moduleName: 'workbox-precaching',
            className: 'PrecacheController',
            funcName: 'install',
            paramName: 'plugins'
          });
        }
      }

      const urlsToPrecache = [];
      const urlsAlreadyPrecached = [];
      const cache = await caches.open(this._cacheName);
      const alreadyCachedRequests = await cache.keys();
      const alreadyCachedURLs = new Set(alreadyCachedRequests.map(request => request.url));

      for (const cacheKey of this._urlsToCacheKeys.values()) {
        if (alreadyCachedURLs.has(cacheKey)) {
          urlsAlreadyPrecached.push(cacheKey);
        } else {
          urlsToPrecache.push(cacheKey);
        }
      }

      const precacheRequests = urlsToPrecache.map(url => {
        return this._addURLToCache({
          event,
          plugins,
          url
        });
      });
      await Promise.all(precacheRequests);

      {
        printInstallDetails(urlsToPrecache, urlsAlreadyPrecached);
      }

      return {
        updatedURLs: urlsToPrecache,
        notUpdatedURLs: urlsAlreadyPrecached
      };
    }