serviceworker.js

importScripts('https://storage.googleapis.com/workbox-cdn/releases/3.6.1/workbox-sw.js');

if (workbox) {
    const cacheName = 'my-site-cache';

    workbox.routing.registerRoute(
        '/',
        workbox.strategies.networkFirst({
            cacheName
        })
    );

    workbox.routing.registerRoute(
        /wp-content\/uploads/,
        workbox.strategies.cacheFirst({
            cacheName
        })
    );
    workbox.routing.registerRoute(
        /wp-content\/themes\/theme-name\/assets/,
        workbox.strategies.staleWhileRevalidate({
            cacheName
        })
    );
    workbox.routing.registerRoute(
        /cache\/autoptimize/,
        workbox.strategies.staleWhileRevalidate({
            cacheName
        })
    );
}