Ive learned how to copy and paste Less and Handlebars files from components/extensions to the Themes folder, to mod and override an extension/component without modifying the original plugin.

However, a mod I want to do to an extension requires changing a .js file. 

I cannot change the plugin, as its shared in our Authoring Tool with other courses. 

Id rather not create a copy of the plugin, as that eventually will create a lot of fragmentation, issues with updates, etc etc. 

Is there a way to override or mod a plugins .js in the theme, much like can be done with Less/Handlebars?

Thanks