External dependencies that are not peer dependencies

[xaviervia]

I have a project that depends on several lightweight dependencies, so they shouldn't be considered peerDependencies (I don’t want to burden the consumers with installing them manually) but I don't want them not to be bundled, since the library is for both frontend and backend and it should work as expected in Node. Could an option be added that sets a dep to be external even if it's not a peer dependency on the package.json?