...But in my blog, I don't want to use even npm, and I want to precache recent 10 posts so that they are offline available to visitors even though these posts were never opened by visitors before. That's why I try to integrate this function in Jekyll build process. This plugin supports Workbox V5 since v5.1.4. The API of Workbox V5 has changed a lot compared to previous versions, some more powerful functions added too.