Build fails if package doesn't have "main" param in its package.json

[Amir-A-M]

Hello

Metro bundler fails if a package doesn't have "main" param in its package.json

"main" is not part of the spec for ESM module

I was trying to build my Expo React Native app, and I was stuck at some error like this:

Starting Metro Bundler
Error: While trying to resolve module `react-merge-refs` from file `/home/expo/workingdir/build/src/Hook/useDraggableScroll.ts`, 
the package `/home/expo/workingdir/build/node_modules/react-merge-refs/package.json` was successfully found. 
However, this package itself specifies a `main` module field that could not be resolved (`/home/expo/workingdir/build/node_modules/react-merge-refs/index`. 
Indeed, none of these files exist:

I Added Blow line to the 'react-merge-refs' package.json in a fork and it fixed it.
metro bundler should handle this

"main": "./dist/index.mjs",

Thanks and Regards