npm: ❌ results in "Warning: Invalid hook call", yarn: ✅ works fine

[samsnori]

Hi, I'm working on a react native project where I have a directory structure like this:

shared-lib/
    src/
        /mobile
        /web
        /...

my-project/ (react native)
   src/

Where my-project is using a hook that is exported from shared-lib/src/mobile. The thing I want to get working in my RN project is to be able to include modules from my local package shared-lib/src/mobile that I added as a dependency in my-project with yarn add ../shared-lib.

Now, this is the strange thing: when I use npm and start my app it results in "Warning invalid hook call" which is a very well known issue. Though when I use yarn to install the dependencies of my shared lib and app, things work fine!

I'm happy that things work, but I rather know exactly why yarn works and npm fails. Does someone have an idea why?