Can i use it in WebWorker?

[VanDalkvist]

No description provided.

[MarkMYoung]

This answer is much more complicated than I anticipated when I first read your question because of browser inconsistencies (e.g. no sub-Worker support in Chrome, indexedDB accessible from self but not openDatabase). From what I can tell, you should be able to use importScripts (referencing the core and the plug-ins you want) to access the database in a long-running/resource-intensive Worker(s).

Please let us know whether this route works for you so we can give a more definitive answer to others.