Elysia Project Structure

The high-performance web framework for Bun. Elysia is designed to take full advantage of Bun's speed and features, offering an extremely fast and type-safe developer experience with a clean, modern TypeScript architecture.

Updated 2025-12-30

#elysia #bun #typescript #web-framework #type-safety #open-source

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Project Directory

elysia/

src/

Core framework source

index.ts

Main entry point

elysia.ts

The core class definition

handler.ts

Request handling logic

utils.ts

example/

Usage examples

package.json

npm package manifest

tsconfig.json

Repository Info

Repository-elysiajs/elysia
Stars-10k+
License-MIT
Last Analyzed-December 2025

Tech Stack

Runtime-Bun
Language-TypeScript
Validation-TypeBox (Static type inference)
Build Tool-Bun build

Architecture Notes

Elysia's architecture is built around the concept of 'Static Type Inference'. By using TypeBox, Elysia is able to provide end-to-end type safety without the overhead of heavy runtime validation. The framework is designed specifically for Bun, allowing it to utilize Bun's optimized APIs for networking and file I/O. Its structure is very flat and efficient, reflecting its focus on minimal overhead and maximum performance.

Key Directories

src/-The core engine that provides the fluent API and type-safe routing
example/-A collection of practical use cases demonstrating Elysia's features and performance

Why This Structure?

Elysia is the premier framework for the Bun ecosystem. It shows how to build a modern web framework that prioritizes both developer experience (via deep type safety) and runtime performance. It's an essential study for anyone building high-speed TypeScript services.

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