npm/yarn 默认安装 devDependencies 吗？

Question

I'm working on private library of react components. I've already setup the whole workflow etc. but I'm not sure about one thing.

In my library I have some packages listed as peerDependencies which have to be peer ones (for example react , cuz only one instance of react can be installed at once, otherwise everything breaks). But if I'd like to setup some tests in my library I need react installed there as devDependency .

So I have to install react as peer and dev in library. And what happens when I publish this package to npm register? devDependencies are excluded here?

Thanks!

Answer 1

If you create a node package, and you have some dev dependencies, npm wont count them for the publish. That's why it's called devDependencies . It's not under the production code.

Answer 2

I know you have to specify when installing an npm package --save-dev so it saves dependencies onto your json file.

Answer 3

If you need it in production, add it to peerDependencies . Otherwise, leave it in devDependencies . When someone installs your library, dev dependencies won't be installed, and peer dependencies should already be installed.