yarn 管理nextjs 项目

nodejs 
npm

npm  install -g yarn 

yarn add  next react  react-dom

"scripts":{
    "dev": "next",
    "build": "next build",
    "start": "next start"
  }

mkdir pages
cd pages

touch index.js 
// content 
export default ()=> <div>this is the index page </div>

// run 

yarm run dev

// ok  就是这么简单

https://yarnpkg.com/zh-Hans/docs/getting-started