Bun

Bun consolidates four separate JavaScript tools into a single, unified binary executable. The runtime executes JavaScript and TypeScript on JavaScriptCore (Safari's engine) rather than V8, achieving significantly faster startup times and lower memory usage than Node.js. The package manager is npm-compatible and up to 30x faster for dependency resolution. The test runner is Jest-compatible with instant startup. The bundler handles TypeScript, JSX, CSS, and HTML, creating optimised single-file executables. Bun includes built-in APIs eliminating the need for separate dependencies: PostgreSQL and MySQL drivers, SQLite support, Redis client, S3 integration, HTTP and WebSocket servers, native shell scripting support, password hashing, and FFI (Foreign Function Interface) for calling C libraries. The tool supports workspace and lockfile management matching npm semantics, facilitating easy Node.js migration. Bun is open-source (MIT/Apache 2.0 license) and hosted on GitHub. The project is now part of Anthropic as of a recent announcement. Bun positions itself as a Node.js and Deno replacement offering superior performance and developer experience. Cross-platform builds enable compiling for different operating systems from any machine. The project now has corporate backing from Anthropic, suggesting long-term stability.