Publishable Expo library has wrong main value in package.json out of the box.

[D-Kuzin]

Current Behavior

When creating a fresh expo workspace using the command:
npx create-nx-workspace@latest --preset=expo --appName=expo

And creating a new expo library using the command:
nx g lib --publishable --importPath=@org/expo-lib

Then the library will have the following package.json by default:

{
  "name": "@org/expo-lib",
  "version": "0.0.1",
  "main": "src/index.ts",
  "peerDependencies": {
    "react": "~18.3.1",
    "react-native": "0.76.3"
  }
}

After adding some content into the index.ts file and building the library with the command:
yarn nx build expo-lib

When inspecting the dist folder of the library, the package.json content is the following:

{
  "name": "@org/expo-lib",
  "version": "0.0.1",
  "main": "src/index.ts",
  "peerDependencies": {
    "react": "~18.3.1",
    "react-native": "0.76.3"
  },
  "module": "./index.esm.js",
  "type": "module",
  "types": "./index.esm.d.ts"
}

When inspecting the contents, there doesn't exist any index.ts file as the package.json is referencing to.

Expected Behavior

It's expected that either:

1. Rollup overwrites by default the main field with ./index.esm.js when building the library
2. Expo library doesn't add the field main in the package.json when generating the library

GitHub Repo

https://github.com/D-Kuzin/nx-expo-lib

Steps to Reproduce

1. Build expo-lib
2. Insepct dist/expo-lib/package.json and see that there's a reference to src/index.ts

Nx Report

Node           : 23.8.0
OS             : darwin-arm64
Native Target  : aarch64-macos
npm            : 10.9.2

nx                     : 20.4.6
@nx/js                 : 20.4.6
@nx/jest               : 20.4.6
@nx/eslint             : 20.4.6
@nx/workspace          : 20.4.6
@nx/devkit             : 20.4.6
@nx/eslint-plugin      : 20.4.6
@nx/expo               : 20.4.6
@nx/module-federation  : 20.4.6
@nx/react              : 20.4.6
@nx/rollup             : 20.4.6
@nx/web                : 20.4.6
@nx/webpack            : 20.4.6
typescript             : 5.7.3
---------------------------------------
Registered Plugins:
@nx/expo/plugin
@nx/eslint/plugin
@nx/jest/plugin
@nx/rollup/plugin

Failure Logs

Package Manager Version

No response

Operating System

• macOS
• Linux
• Windows
• Other (Please specify)

Additional Information

No response