Define custom paths for modules resolutions

modules_source.js

const path = require('path')
const util = require('util')
const BuiltinModule = require('module')
const Module = module.constructor.length > 1
  ? module.constructor
  : BuiltinModule

const options = util.parseArgs({ args: process.argv.slice(2), options: {
  paths: {
    type: 'string'
  }
}})

const oldNodeModulePaths = Module._nodeModulePaths
Module._nodeModulePaths = function (from) {
  let paths = oldNodeModulePaths.call(this, from)
  if (options.values.paths) {
    const customPaths = Array.isArray(options.values.paths) ? options.values.paths : options.values.paths.split(',')
    paths = paths.concat(customPaths.map((c) => path.join(process.cwd(), c)))
  }
  return paths
}