Overview of involved frontend technology's versions

Is there a way to find out which versions exactly are used in the different libraries?

For example, I am struggling to find out which ECMAScript Version is allowed in JIRA Server frontend code. Also, working through the newest Select2 documentation I finally realized that the Select2 version used in JIRA AUI is 3.5.x.

Thank you!

While it doesn’t dig into the versions of other dependencies - https://bitbucket.org/atlassian/platform-module-usage/wiki/aui.md