This package provides TypeScript type definitions for Bun's APIs without polluting the global namespace, making it ideal for universal tools and libraries that need to support multiple runtimes like Node.js, Bun, and browsers. It solves the problem of transitive type leakage and global conflicts that occur when using standard Bun types in libraries consumed by different environments. The project is specifically designed for advanced use cases where developers need isolated Bun types without forcing them on all users, such as multi-runtime libraries and build tool plugins that support various bundlers.