Config build multiple environment for vuejs with webpack

build.js

// build/build.js
// Replace
process.env.NODE_ENV = 'production'
// with
process.env.NODE_ENV = process.argv[2] || 'production'

// Replace
const spinner = ora('building for production...')
// with
const spinner = ora(`building for ${process.env.NODE_ENV}...`)

ecosystem.config.js

const production = {
  user: 'deploy',
  host: '192.168.1.10',
  ref: 'origin/master',
  repo: 'git@github.com:hoangmirs/hoang_app.git',
  path: '/home/deploy/hoang_app',
  fetch: '--all',
  'post-deploy': 'yarn install && yarn build production',
};

module.exports = {
  apps: [{
    name: 'hoang_app',
    // Options reference: https://pm2.io/doc/en/runtime/reference/ecosystem-file/
  }],

  deploy: {
    dev: {
      ...production,
      ref: 'origin/develop',
      path: '/home/deploy/hoang_app_dev',
      'post-deploy': 'yarn install && yarn build dev',
    },
    staging: {
      ...production,
      ref: 'origin/staging',
      path: '/home/deploy/hoang_app_staging',
      'post-deploy': 'yarn install && yarn build staging',
    },
    production: { ...production }
  }
};

staging.env.js

// config/staging.env.js
'use strict'
const merge = require('webpack-merge')
const prodEnv = require('./prod.env')

module.exports = merge(prodEnv, {
  NODE_ENV: '"staging"',
})

webpack.prod.conf.js

// build/webpack.prod.conf.js
// Replace
const env = process.env.NODE_ENV === 'testing'
  ? require('../config/test.env')
  : require('../config/prod.env')
// with
const configPaths = {
  test: '../config/test.env',
  dev: '../config/dev.env',
  staging: '../config/staging.env',
  production: '../config/prod.env',
};
const env = require(configPaths[process.env.NODE_ENV]);