Should PWA Registration be on every page of a PWA app?

[mscherotter]

Should this code be on a every page of a site that runs as a PWA or just the main page?

<script type="module">
    import 'https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate';
    const el = document.createElement('pwa-update');
    document.body.appendChild(el);
</script>

[khmyznikov]

SW registration should be on every "initial" page from where user can open the app for the first time. If you have single startup page in SPA for example, you can use it once in index.html. For multiple page app with SSR or server routing you need this on every accessible page.