Inspect compiled sources of selected file.

[mixtur]

Is your feature request related to a problem? Please describe.
When trying to investigate why specific file takes specific amount of space it would be very helpful to see its compiled contents. If I could do so I could make further optimization steps, like avoid some patterns, or change babel settings, or see if it is actually not minimized for some reason, or not optmal in some other way. And take action based on that information.

Describe the solution you'd like
I would like to be able to see compiled (and may be original) content of file picked in the tree. In a popup or sidebar.