why service worker download new content automatically, but doesn't update? - vue.js

Question

I register service worker this way:
/* eslint-disable no-console */
import { register } from 'register-service-worker'
if (process.env.NODE_ENV === 'production') {
register(`${process.env.BASE_URL}service-worker.js`, {
ready() {
console.log('App is being served from cache by a service worker.');
},
registered() {
console.log('Service worker has been registered.');
},
cached() {
console.log('Content has been cached for offline use.');
},
updatefound() {
console.log('New content is downloading.');
},
updated() {
console.log('New content is available; please refresh.');
},
offline() {
console.log('No internet connection found. App is running in offline mode.');
},
error(error) {
console.error('Error during service worker registration:', error);
}
});
}
when I vue-cli-service build --mode production and then I deploy to the server, online I can correctly see the logs:
App is being served from cache by a service worker.
Service worker has been registered.
New content is downloading.
New content is available; please refresh.
It seems to download automatically the content, but from now, it still always show New content is available; please refresh (and in fact, the content is not refreshed).
It seems it won't refresh automatically? Only downloading? Why?
How can I refresh on updated()?

Answer 1

what I did in this situation was to resolve a promise that will reload the page for the user. This is nice because it waits and then does the page reload after the data has come in.
/* eslint-disable no-console */
import { register } from 'register-service-worker'
if (process.env.NODE_ENV === 'production') {
register(`${process.env.BASE_URL}service-worker.js`, {
ready() {
console.log('App is being served from cache by a service worker.');
},
registered() {
console.log('Service worker has been registered.');
},
cached() {
console.log('Content has been cached for offline use.');
},
updatefound() {
console.log('New content is downloading.');
},
updated() {
console.log('New content is available; please refresh.');
Promise.resolve().then(() => { window.location.reload(true); });
},
offline() {
console.log('No internet connection found. App is running in offline mode.');
},
error(error) {
console.error('Error during service worker registration:', error);
}
});
}

Answer 2

you should use skipWaiting method of service worker object.
maybe this can help you:
updated(registration){
const waitingServiceWorker = registration.waiting;
if (waitingServiceWorker) {
waitingServiceWorker.addEventListener('statechange', event => {
if (event.target.state === 'activated') {
window.location.reload();
}
});
waitingServiceWorker.postMessage({ type: 'SKIP_WAITING' });
}
}
whether this code is working or not depends on your service-worker.js content.
but the idea is the same you should use skip waiting.