Express serving production files

package.json

{
  "name": "express-without-eject",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "react-scripts": "0.7.0"
  },
  "dependencies": {
    "express": "^4.14.0",
    "react": "^15.3.2",
    "react-dom": "^15.3.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "dev": "node server/server.dev.js",
    "serve": "node server/server.prod.js",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
}