Allow option for un-minified/uglified versions of js

## Describe the problem

I'm experiencing a null error and can't debug the cause because it's minified/uglified.

## Describe the solution

Provide an option to fetch an _unminified/uglified_ version

## Alternatives you've considered

I tried debugging it while uglified, but it just isn't feasible.

The issue names no files, tests, or build entry points. Start by locating how the JavaScript bundle is minified or uglified and where distribution options are configured; done means an unminified or unuglified version can be fetched and the relevant behavior is covered by repository checks.

Written by the indexing model from the issue text.