Can I ask the requirement for main, module and typings in your root package.json?

[U-4-E-A]

Firstly, thank you for your excellent article on medium.com. It has been a huge help to my understanding of the package.json, node, cjs and esm.

My question is what is the requirement for the main, module and typings fields in your root package.json? I understand what these fields represent (entry points for cjs, esm and Typescript, respectively) but are they not superfluous to requirements as each subpath effectively acts as it's own module access via package/module/submodule syntax therefore negating the requirement for these entry points? Or is this some kind of edge case I am unaware of? Thanks.