Use clients claim and skip waiting to make sure that service worker takes over the window on the initial load (not just subsequent refreshes).

See https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle.

generator/src/develop.js

@@ -190,6 +190,8 @@ function webpackOptions(production, routes, { debug, manifestConfig }) {
         }
       }),
       new GenerateSW({
+        skipWaiting: true,
+        clientsClaim: true,
         include: [
           /^index\.html$/,
           /\.js$/,