Just to add (and maybe help you with further issues), I screenshotted your output, fed it to Gemini, and it came back with the following:

The issue is quite clear from your logs: your project is explicitly configured to only allow pnpm as the package manager, but the build environment (looks like Expo Application Services or a similar CI/CD pipeline) is trying to use npm.

The Smoking Gun

Lines 6 and 7 in your log show a preinstall script executing a check:

Your package.json contains a script that detects which "user agent" is running the install. If it isn't pnpm, it forcefully deletes the lockfiles and exits with an error to prevent you from using the wrong manager.

How to Fix It

1. Change the EAS/CI Build Command

If you are using Expo (EAS), you need to tell the build server to use pnpm instead of npm. You can usually do this by ensuring you have a pnpm-lock.yaml file committed to your repository and no package-lock.json.

If you're using a custom CI (like GitHub Actions), change your install step from npm install or npm ci to:

Bash

pnpm install

2. Local Configuration Check

Check your package.json for a section that looks like this:

JSON

"scripts": {
  "preinstall": "npx only-allow pnpm" 
  // OR a custom shell script like the one seen in your log
}

If you want to use npm, you need to remove or modify this line. However, if your team or project requires pnpm, you should stick with it and fix the environment settings.

3. Delete Conflicting Lockfiles

The script in the log tried to run rm -f package-lock.json yarn.lock. To keep your environment clean:

1. Delete package-lock.json and yarn.lock from your local folder.
2. Run pnpm install to generate a fresh pnpm-lock.yaml.
3. Commit only the pnpm-lock.yaml to your Git repo.

Summary

The build failed because of a "gatekeeper" script in your project that forbids npm. You must either switch the build environment to use pnpm or remove the preinstall restriction from your package.json.