Do we have to install prop-types library when we are using create-react-app, or it already includes it?

Hi,

Do we have to install prop-types library when we are using create-react-app, or it already includes it?

I’m asking because, after ejecting i can’t see prop-types library neither in dependencies or devDependencies, but if i use it in the project without installing it, it works perfectly and isn’t throwing any errors that prop-types library isn’t installed.

We are recording React tutorial using create react app and knowing precise answer for this question, would be great.

Thanks!

[gaearon]

You should never rely on transitive dependencies. For example if React uses PropTypes internally (without exposing them), it could potentially remove them or change their major version, and do so in a patch release. This is safe if they’re not exposed.

Therefore you should never rely on other packages’ transitive dependencies just “being there”. Always explicitly install them (and add them to package.json) to avoid them breaking.

[Timer]

@davidshare looks like you hit a npm bug, rm -rf node_modules, remove package-lock.json, and then run npm install again.