为什么每次我使用 npm 或 yarn 安装 package 时，它都会安装所有依赖项？

Question

every time I install a dependency, for example yarn add socketio , instead of installing that dependency alone it installs all the ones from the package.json . Is there a way that I only install the dependency that I indicate and not all?

Answer 1

Checked with v1.22.0 .

This should only happen if you have a package.json file and its dependencies are not installed.

Consider the example, where you have underscore as dependency in package.json and somehow it is not installed yet. Now, you're trying to install let's say color package. In this case, yarn will install color as well as underscore as dependencies. But, once all the dependencies mentioned in package.json are installed, yarn will not install dependencies again.