How do I decide whether @types/* goes into `dependencies` or `devDependencies`?

Question

I use TypeScript 2 in my project. I\'d like to use some js library, but also typings for that library. I can install types with simple npm install @types/some-library<

Answer 1

In the particular case of deploying a Node.js application to production, one wants to install only the dependencies needed to run the application.

npm install --production or

npm ci --production or

yarn --production

In that case, the types should be in the devDependencies, to keep them from bloating the installation.

Remark: I'm aware this was mentioned in a comment by Brad Wilson to another answer. This point seems worthy to be an answer, though.