Migrate Google Workbox setDefaultHandler // setCatchHandler from v2 to v3 - service-worker

Question

I'm trying to migrate my old code from google workbox v2 to workbox v3, and i can't use workbox.routing.registerNavigationRoute because my default route '/' (which is where my appshell is) is a runtime cache (because it's for a multilingual website https://www.autovisual.com with languages put in subfolder '/fr', '/es' ... with a unique Service-Worker scoped at '/').
This is the v2 code :
workboxSW.router.setDefaultHandler({
handler: ({
event
}) => {
return fetch(event.request);
}
});
workboxSW.router.setCatchHandler({
handler: ({
event
}) => {
if (event.request.mode === 'navigate') {
return caches.match('/');
}
return new Response();
}
});
It seems pretty basic : the goal is to catch all request 'navigate' that didn't match any other route and send the cached version, network first, of the url '/'.
For the info in the client js i use :
if ('serviceWorker' in navigator) {
window.addEventListener('load', function() {
caches.open('rootCacheNetworkFirst').then(function(cache) {
cache.match('/').then(function(response) {
if (!response) {
cache.add('/');
}
});
});
navigator.serviceWorker.register('/sw.js', {
scope: "/"
});
});
}
I can't find any example with the new v3 workbox.routing.setDefaultHandler and workbox.routing.setCatchHandler and i'm stuck :(

Answer 1

I don't think that using either setDefaultHandler or setCatchHandler is relevant for that described use case.
To accomplish what you describe, add the following code to your service worker file after all other routes are registered. (In Workbox v3, the first-registered-route takes precedence.) You just need to configure a NavigationRoute and register it:
const networkFirst = workbox.strategies.networkFirst({
cacheName: 'your-cache-name',
});
const navigationRoute = new workbox.routing.NavigationRoute(networkFirst, {
// Set blacklist/whitelist if you need more control
// over which navigations are picked up.
blacklist: [],
whitelist: [],
});
workbox.router.registerRoute(navigationRoute);