Currently, we are crawling the cashable assets for a page through PHP in "fetchOfflinePageResources()". This can lead to performance issues and instead, we should use a dedicated javascript library to crawl the cachable assets.
Furthermore, we should refactor the crawling, as it doesn't take every asset into account. From the parent issue:
Crawling is not sufficient, it will not find URLs in subsequent CSS & JS files for example (using @import (CSS) or import (JS)) so it's by far not complete
Use a dedicated js library to crawl the cachable assets.
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FYI: I didn't find a good library yet to crawl the websites to preload / cache, including their assets. Perhaps someone else is more successful, I can't believe it doesn't exist...
Until that, workbox is our hope... #3060760: Use Google Workbox library →