node: Cannot find module (node installed with brew) - node.js

Question

I try to run a script that i wrote in node. In order to debug and show you my problem, i reduced the script to:
#! /usr/bin/env node
var prompt = require('prompt');
When i try to run the script i get
module.js:340
throw err;
^
Error: Cannot find module 'prompt'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (/Users/derzyklop/S/dotfiles/bin/bugs:3:14)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
I tried to install "prompt" with npm install prompt and also global with npm install prompt -g. But my script still doesn't work.
"prompt" seems to be installed, because npm list --depth=0 gives me
and npm list -g --depth=0 gives me
I installed node via brew, so the next thing i tried was that i removed node by brew remove npm and brew remove node and i downloaded the installer for OSX from here. But that didn't change anything.
I'm out of ideas. Why can't node find the module?
Is it possible, that npm list -g searches at other paths than the require(..) in my script?
Update
The script is located in my personal bin-folder in ~/dotfiles/bin/myscript which is added to $PATH by export PATH=~/dotfiles/bin:$PATH.
I found out, that require() searches global modules in {prefix}/lib/node_modules, where {prefix} is npm config get prefix.
So i can temporary fix it by doing this: require('/usr/local/lib/node_modules/prompt');.
Local modules are searched in ./node_modules. In my case this must be ~/dotfiles/bin/node_modules, so i did
cd ~/dotfiles/bin/
npm install prompt
and with this i can use require('prompt'); in my script.
So the question is: How do i let my node-script search for modules in {executing directory}/node_modules?
And still: Why is require() not searching in /usr/local/lib/node_modules/?

Answer 1

Mocha is going to be your friend here, it is the fastest way to remedy this situation. Install mocha:
$ npm install -g mocha
Also your test script is problematic. So you can make test script: test.js with the following.
var assert = require("assert")
describe('Array', function(){
describe('#indexOf()', function(){
it('should return -1 when the value is not present', function(){
assert.equal(-1, [1,2,3].indexOf(5));
assert.equal(-1, [1,2,3].indexOf(0));
})
})
})
Then it is simple as running: mocha test.js
I tested this and I was receiving the same errors as you from node. Even if you do node test.js you will get an error. Hopefully this mocha solution works for you.
Refrences:
1. http://visionmedia.github.io/mocha/