stevencl
The great thing about doing usability studies on APIs is that it is easy to mock up a prototype of the API that people can start to code against. The API doesn't have to work but you get to see how people react to the names of classes, methods, parameters etc. I used to blog about API usability and what we were learning here: https://blogs.msdn.microsoft.com/stevencl/tag/api-usability/
There is a group of researchers and practitioners currently working on API usability. Some good links here: http://www.cs.cmu.edu/~NatProg/apiusability.html
Download the node.d.ts file from the DefinitelyTyped repo https://github.com/borisyankov/DefinitelyTyped then add that file to the folder containing your node app.
Then in the file you are using the http object reference the .d.ts file by adding the following to the top of the file:
/// <reference path="node.d.ts" />
After that you should get intellisense in the file.