[tentacleuno]

One of the advantages of libraries such as these (in my opinion) is it gives you the ability to incorporate the errors thrown into the return type of functions, creating a broader contract than you would ordinarily achieve.

This is mainly in the context of TypeScript (think IntelliSense, etc.), also considering the fact that TypeScript doesn't support typed errors (neither does Flow, FWICS).

Then again, wrapping everything is a huge pain.