derequire
npm install derequire
var derequire = require('derequire');
var transformedCode = derequire(code, '_dereq_', 'require');
takes a string of code and replaces all instances of the identifier tokenFrom
(default 'require') and replaces them with tokenTo (default '_dereq_') but only if they are functional arguments and subsequent uses of said argument, then returnes the code.
Note: in order to avoid quite a few headaches the token you're changing from and the token you're changing to need to be the same length.