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Discussion on: What's your favorite tool or library that few others have heard of?

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Julien Bourdeau

I personally love codemod for refactoring large pieces of code. It allows me to write loose regex and make sure every replacement is perfect.
github.com/facebook/codemod

As the author puts it:

Codemod is a tool/library to assist you with large-scale codebase refactors that can be partially automated but still require human oversight and occasional intervention. Codemod was developed at Facebook and released as open source.