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Update to workbox-webpack-plugin v4

Merged Administrator requested to merge github/fork/r0ughnex/feature/update-to-workbox-webpack-plugin-v4 into master

Created by: r0ughnex

DESCRIPTION:

  • Resolves #6659 (closed): Updated the workbox-webpack-plugin from v3 to latest v4 and also tested some of the new configuration options such as skipWaiting and cleanupOutdatedCaches after ejecting the app.

  • Resolves #6243 (closed): The new version automatically solves the issue where a registered service worker still tries to load an old resource, after workbox has cleaned up its old cache after an update.

TESTS COMPLETED:

  • Change the app code to serviceWorker.register() and run build, then check if workbox caches the relevant files and if the service worker installs correctly and triggers the onSuccess callback.

  • Add flag skipWaiting: true to the webpack.config.js, then update the app code and perhaps also the version number in package.json, then repeat the test above and check if the new service worker takes over the application and triggers the onUpdate callback. Older outdated workbox caches should be deleted at the point (from logs visible on the dev console in localhost)

  • Add flag cleanupOutdatedCaches: false, repeat the test above and check if the new service worker takes over the application. Older outdated workbox cache should not deleted now (this option is only available in versions 4.x.x and above).