@progressivewebcomponents/pwa-install/pwa-install.js

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

import { PWAInstall } from './pwa-install-class.js';

customElements.define(PWAInstall.is, PWAInstall);