Not that it will help you with github, but... I use the IDE named 'QTCreator' to work with the code. Then, I have the ability to easily search through all files in the project and find definitions, etc. Maybe some kind of ide is what you need?
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Not that it will help you with github, but... I use the IDE named 'QTCreator' to work with the code. Then, I have the ability to easily search through all files in the project and find definitions, etc. Maybe some kind of ide is what you need?