server.js

const { spawn } = require('child_process')

const grunt = spawn('grunt', {
  env: Object.assign({}, process.env, { PATH: `./node_modules/.bin:${process.env.PATH}` }),
  stdio: 'inherit'
})

grunt.on('close', (code) => {
  console.log(`Grunt closed with error code ${code}`)
  process.exit(code)
})

grunt.on('error', (error) => {
  console.log(`Grunt error: ${error}`)
  process.exit(1)
})
  
process.on('exit', () => {
  grunt.kill()
})