javascript 为什么当我只需要构建时，yarn 会安装开发依赖项？
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Why will yarn install dev dependencies when I just need the builds?
提问by vdegenne
If I invoke yarn add <my-package>, Yarnwill install both dependencies and devDependencies of <my-package>. Is it normal behavior ?
如果我调用yarn add <my-package>，Yarn将安装<my-package>. 这是正常行为吗？
I checked the documentation but I couldn't find a way to prevent it from installing the development dependencies (which I don't need). I believe devDependenciesare the dependencies that were used to compile the sources into the build scripts. And building my app I just need the builds.
我检查了文档，但找不到阻止它安装开发依赖项（我不需要）的方法。我相信devDependencies是用于将源代码编译到构建脚本中的依赖项。构建我的应用程序我只需要构建。
回答by kimy82
Use --production=true(or simply --productionor --prodfor short). It is indeed normal behaviour; Yarn assumes you are in a 'development' context unless your NODE_ENV environment variable is set to 'production'.
使用--production=true（或简单地--production或--prod简称）。这确实是正常的行为；Yarn 假定您处于“开发”上下文中，除非您的 NODE_ENV 环境变量设置为“生产”。
Have a look at Yarn's documentation.
看看 Yarn 的文档。
