title: run-p: command not found
body: <p>after installing 'npm install webpack-dev-server -g'
  not able to start expressjs project. </p>
  
  <p>I am using below script:</p>
  
  <pre>
  "scripts": {
      "start": "run-p watch dev-server",
      "watch": "webpack --config webpack.config.js --watch --mode development",
      "dev-server": "BABEL_ENV=dev nodemon --exec 'babel-node' src/server/index.js --config nodemon.json"
  }
  </pre>