trace.js

// Inspired by https://github.com/tlrobinson/long-stack-traces
var util = require('util')

function extendTrace (object, property, pos) {
  var old = object[property]
  object[property] = function () {
    var error = new Error()
    var name = object.constructor.name + '#' + property + '(' +
      Array.prototype.slice.call(arguments).map(function (el) {
        return util.inspect(el, false, 0)
      }).join(', ') + ')'

    if (typeof pos === 'undefined') pos = -1
    if (pos < 0) pos += arguments.length
    var cb = arguments[pos]
    if (typeof arguments[pos] === 'function') {
      arguments[pos] = function replacement () {
        try {
          return cb.apply(this, arguments)
        } catch (err) {
          if (err && err.stack && !err.__augmented) {
            err.stack = filter(err).join('\n')
            err.stack += '\n--> in ' + name
            err.stack += '\n' + filter(error).slice(1).join('\n')
            err.__augmented = true
          }
          throw err
        }
      }
    }
    return old.apply(this, arguments)
  }
}
exports.extendTrace = extendTrace

function filter (error) {
  return error.stack.split('\n').filter(function (line) {
    return line.indexOf(__filename) < 0
  })
}