Log Line Numbers in NodeJS

app.js

// include it in the first file that NodeJS will load
// yes, eval is dangerous, but not when you know exactly what it's loading
var fs = require("fs");
eval(fs.readFileSync(__dirname+'log.js')+'');

// Usage, in say /routes/user.js
console.log(__line, user.userID)
// /routes/user.js:34:22 > 2

log.js

Object.defineProperty(global, '__line', {
  get: function(){
    return ((new Error()).stack.split("\n")[2].trim().replace(/^(at\s?)(.*)/gim, "$2 >").replace(__dirname, ""))
  }
});