Transforming dependencies with babelify breaks underscore.js

[aknuds1]

Choose one: This is a 🐛 bug report

Expected Behavior

Building an app depending on underscore.js (directly or indirectly) should work, also the build should be reasonably quick.

Current Behavior

Since bankai transforms dependencies with babelify, at least underscore.js as a dependency gets broken (due to global this becoming undefined instead of window or global). The build also gets slowed down significantly (for me 5-6 times).

Possible Solution

Add option to enable or disable babelify on dependencies.

Context

It breaks my underscore.js dependency and slows down my build 5-6x.

[goto-bus-stop]

#455 disables the Babel modules transform which solves most if not all of these cases. and #422 can be used if speed is an issue. thanks!