birpc is a versatile, lightweight library for creating bidirectional RPC (Remote Procedure Call) interfaces between JavaScript environments. It simplifies communication between browser and Node.js, workers, iframes, or even cross-origin contexts. With automatic type inference and no boilerplate, birpc enables seamless exchange of functions and data, enhancing modularity and simplifying complex application architectures. It also boasts customizable serialization and robust error handling for stable integrations.