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async-waituntil-polyfill
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In earlier versions of the service worker spec, event.waitUntil
had to be called synchronously, as in during the initial execution of the event handler. Meaning this would fail:
self.addEventListener('fetch', event => {
event.respondWith(
caches.open('mysite-dynamic').then(cache => {
// try the cache first
return cache.match(event.request).then(response => {
// if we get a response, use it
if (response) return response;
// otherwise, go to the network
return fetch(event.request).then(response => {
// cache it asynchronously for next time
event.waitUntil(
cache.put(event.request, response.clone())
);
// return the response
return response;
});
});
})
);
});
This fails because waitUntil
was called after the execution of the event handler. But we need to use waitUntil
here because the browser needs to know to keep the service worker alive after we've sent the response back.
We fixed this in the spec, so you can call waitUntil
as long as the promises already passed to waitUntil
& respondWith
haven't settled yet.
The browsers haven't caught up yet, but this polyfill makes it work as expected.
In your service worker:
importScripts('async-waituntil.js');
That's it! The above example now works.
FAQs
Allows waitUntil to be called async on extendable events
The npm package async-waituntil-polyfill receives a total of 91 weekly downloads. As such, async-waituntil-polyfill popularity was classified as not popular.
We found that async-waituntil-polyfill demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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Streamline your login process and enhance security by enabling Single Sign-On (SSO) on the Socket platform, now available for all customers on the Enterprise plan, supporting 20+ identity providers.
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