nrwl/nx

Nx is a "monorepo platform", tooling that helps a team keep many related projects (apps, libraries, services) in a single repository and still build and test them quickly. The README's tagline is "Smart Monorepos · Fast Builds," and the description says it amplifies both developers and AI agents. According to the README, Nx is built with Rust for performance and extensible via TypeScript, and it works for TypeScript codebases as well as polyglot ones. The core idea is that it caches the outputs of tasks so that anything that did not change is not rebuilt, and it figures out which projects are "affected" by a code change and runs only those. You drop it into any existing npm, pnpm, or yarn workspace with the command nx init, and it picks up your package.json scripts without forcing you to rewrite them. An optional plugin system auto-discovers tasks for the tools you already use, with plugins listed for Vite, Webpack, Jest, Vitest, ESLint, Gradle, Maven.NET, and Go. Nx also ships an integrated CI offering that connects to providers like GitHub Actions, GitLab, and Azure to enable remote caching, distributing tasks across machines, affected-only runs, and automatic end-to-end test splitting. The README also describes a "self-healing CI" feature: an AI agent on the CI pipeline that detects failures, analyzes the root cause, proposes a fix, and verifies it. Someone would adopt Nx when a monorepo is getting slow or hard to manage, or when they want CI runs that skip work that already passed. The primary language for the repository is TypeScript.