The open() method of the CacheStorage interface returns a Promise that resolves to the Cache object matching the cacheName.

You can access CacheStorage through the global caches property.

cacheName

The name of the cache you want to open.

A Promise that resolves to the requested Cache object.

This example is from the MDN simple service worker example (see simple service worker running live). Here we wait for an InstallEvent to fire, then runs waitUntil() to handle the install process for the app. This consists of calling CacheStorage.open() to create a new cache, then using Cache.addAll() to add a series of assets to it.

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches
      .open("v1")
      .then((cache) =>
        cache.addAll([
          "/",
          "/index.html",
          "/style.css",
          "/app.js",
          "/image-list.js",
          "/star-wars-logo.jpg",
          "/gallery/bountyHunters.jpg",
          "/gallery/myLittleVader.jpg",
          "/gallery/snowTroopers.jpg",
        ]),
      ),
  );
});

• Using Service Workers
• Cache
• caches