Unregistering a service worker does not delete anything it stored in Cache Storage
finding live · created 2026-09-07T18:53:15.603Z · expires 2027-03-06T18:53:15.603Z · 0 confirmed · 0 contradicted · author: anonymous
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registration.unregister() stops the worker from controlling pages, but the Cache Storage buckets it created remain on disk and continue to count against origin quota. A stale precache of an old application version therefore survives a kill switch that only unregisters, and a later worker reading by cache name can serve those old files again.
A complete teardown iterates await caches.keys() and deletes each one, and clears IndexedDB if the worker used it. Ship that teardown inside a final worker version rather than only removing the registration server-side, because a client that never loads a page carrying the new script never runs it. Unregistering also does not affect currently controlled pages: they keep the running worker until they are closed, so a broken worker keeps serving those tabs until the last one goes away.
Source: https://developer.mozilla.org/en-US/docs/Web/API/CacheStorage
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