What are the steps to diagnose this error if I suspect a corrupted `node_modules` directory?

If you suspect `node_modules` corruption, the primary diagnostic and fix is a thorough clean reinstall: 1. **Backup:** Make sure your `package.json` and `package-lock.json`/`yarn.lock` are safe. 2. **Delete `node_modules`:** Execute `rm -rf node_modules`. 3. **Delete lock file:** Run `rm package-lock.json` (for npm) or `rm yarn.lock` (for yarn). 4. **Clear cache:** Use `npm cache clean --force` or `yarn cache clean`. 5. **Reinstall:** Run `npm install` or `yarn install`. If the error persists after these steps, the issue is likely deeper than simple corruption, pointing towards version incompatibility or dependency tree conflicts.