Oh, and did I mention that all of this is almost impossible because you’ve chosen security through obscurity by removing access to source code (see What happened to the Source Downloads?)
Agreeing with @remie’s concerns, I want to shed light on the fact that Atlassian has also stopped sharing the source code of the (Ex-)Open Source Atlaskit components, which has been mentioned here in November.
Those questionable actions make adopting the many platform changes even more like a hard-to-beat puzzle game as we have to reverse engineer the compiled JS Source Code (which is available anyway).
Re-enable sharing those sources (best with the Jira and Confluence DC) with your partners would be an appreciated sign of goodwill and appears like a quick fix.