sw-builder
The sw-builder package automates the creation of your Application's Service Worker, which pre-caches your build. This leads to a better overall performance and enables users to access your PWA without an Internet connection.
@progressivewebcomponents/pwa-install
A tiny vanilla (zero-dependency) non-visual native browser web component (plug-n-play custom HTML element and extensible class) that helps implement custom patterns for promoting progressive web apps (PWA) installation