If WebStorm uses Tern, you might be able to somehow use this tern info file.
... But otherwise you could probably hack something up so that you could generate a huge JS 'stub' file with all the functions and comments in?
@Gordon started
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.
If WebStorm uses Tern, you might be able to somehow use this tern info file.
... But otherwise you could probably hack something up so that you could generate a huge JS 'stub' file with all the functions and comments in?