Improve debugging experience for minified / obfuscated code

[bhackett1024]

This is a low priority wishlist type feature, but it can be hard at times to understand what code is executing when it has been minified and/or obfuscated.

For example, the recording below is one I made of yarn, to see why yarn jest worked in a package that did not include jest as a script in its package.json. The version of yarn I'm using has minified source, and while I was able to find the place where it spawned the subprocess and passed in the "jest" script to run, figuring out where that script path came from eventually led to a wad of && and , and await expressions chained together, and I gave up. It would be really neat to pick apart the control flow here and understand what this code is doing.

https://app.replay.io/recording/replay-of-yarn-311cjs--53cbe7d6-f6d2-4a96-9d73-64373082b18f?point=1947111326353493799816159821825554&time=2133.3545232273837&hasFrames=true#

[jasonLaster]

Moving this to a discussion and including some more folks

Curious @narendrasss + @geoffreylitt if you have thoughts on this

For me, providing a simple way to edit minified variables would be useful. For instance, changing u to jest would trigger a babel transform that updated the correct references to u.