# npm-vs-yarn

## `yarn`和`npm`的对比

* 版本控制 `npm`的版本控制不够精确,会存在误差.而且每次都不会去`创建/更新`版本. 只有在`npm-shrinkwrap.json`存在的时候,他才会去更新. 默认是不会创建`npm-shrinkwrap.json`

  `yarn`则不同,他会去创建`yarn.lock`,每次执行都是`创建/更新`相关版本号.
* 安全问题 `npm`在安装的时候会运行代码.
* 效率问题 `npm`是一个个的往下执行. `yarn`是并行.安装的效率会大大提高.
* install 1, `npm install`是从`package.json`安装依赖或者添加新的包. 2. `yarn install`只会根据`yarn.lock`或者`package.json`去安装依赖,却不会添加新的包. 3. `yarn install`和`yarn add`相当于`npm install`的作用.
* 相似之处
* `yarn upgrade`相似于`npm update`
* 不同之处
* `yarn licenses ls`可以查看包的相关信息.
* 对应命令行差异

[commands-comparison](https://yarnpkg.com/en/docs/migrating-from-npm#toc-cli-commands-comparison)

[参考地址](https://www.sitepoint.com/yarn-vs-npm/)

* shrinkwrap install

  ```
  npm install npm-shrinkwrap-install
  npm install
  npm prune
  npm dedupe
  npm install
  npm shrinkwrap --dev
  ```

## 有不对的地方还望指出.有更好的结论欢迎提出.


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