worker-farm/lib/fork.js

'use strict'

const childProcess = require('child_process')
    , childModule  = require.resolve('./child/index')


function fork (forkModule) {
  // suppress --debug / --inspect flags while preserving others (like --harmony)
  let filteredArgs = process.execArgv.filter(function (v) {
        return !(/^--(debug|inspect)/).test(v)
      })
    , child        = childProcess.fork(childModule, { execArgv: filteredArgs }, {
          env: process.env
        , cwd: process.cwd()
      })

  child.send({ module: forkModule })

  // return a send() function for this child
  return {
      send  : function (data) {
        try {
          child.send(data)
        } catch (e) {
          // this *should* be picked up by onExit and the operation requeued
        }
      }
    , child : child
  }
}


module.exports = fork