Elysia is a TypeScript‑first web framework that gives developers end‑to‑end type safety and a highly ergonomic API for building fast, type‑secure back‑ends and full‑stack applications, all powered by the ultra‑fast Bun runtime. It bundles features such as unified type definitions, RPC connectors, and comprehensive documentation to streamline development and boost productivity, making it ideal for engineers who want strong type guarantees and a smooth developer experience without sacrificing performance.