@rushstack/eslint-patch is a crucial zero-dependency package for Rush Stack monorepos experiencing issues with ESLint's module resolution. It dynamically patches ESLint's core functionality, ensuring proper resolution of locally installed packages and preventing common "module not found" errors. This patch eliminates the need for complex configurations or workarounds, simplifying the ESLint setup process and enabling a smoother developer experience within Rush-managed projects. Effectively fixes ESLint to work correctly in a pnpm monorepo setup.