In addition to require, any static file path in a function-call can be electrified as well.
var file = fs.readFileSync('./file.js', 'utf-8')
var doSomething = function () {}
doSomething('./file.js')
The below will open either its homepage, repository, or NPM page. Clicking Go > Go to Implementation menu will bring you the actual code in your local node_modules directory.