I've built a Progressive Web App that uses caching, but it's unclear to me whether users can (accidentally or on purpose) clear the service worker cache, which may clear my tracking data.
When a user clears their browsing data / cookies, this clears all site storage which includes the SW cache, cookies, local storage, indexeddb, and any other local caching system.
Furthermore, Ctrl-F5 forces a cache refresh, and is intended to abandon all cached content including service worker cache and just retrieve all content from the servers again.
"Clear site data" in Chrome 76 will delete the caches and the worker, however the deleted worker remains "activated and running". So that's a case that needs dealing with.
来源：https://stackoverflow.com/questions/38709981/can-users-clear-the-service-worker-cache