Ts.ED is a modern, feature-rich TypeScript framework designed for building scalable server-side applications in Node.js and Bun.js environments. Created by Romain Lenzotti and supported by a robust contributor community, it acts as a powerful abstraction layer on top of common web servers such as Express.js, Koa.js, and Fastify.js. By utilizing a class-based, object-oriented approach paired with decorators, Ts.ED significantly improves developer productivity by providing an opinionated yet flexible application architecture. The framework simplifies complex tasks such as dependency injection, routing, input validation, and API documentation, allowing developers to focus on business logic rather than boilerplate configuration. It is built with an AI-forward philosophy, offering resources and templates to streamline project setup and development speed.

Functionality of the framework is centered around its robust Platform API, which provides a consistent interface regardless of the underlying HTTP engine. Ts.ED handles the request-response lifecycle with built-in support for interceptors, middlewares, and pipes, ensuring that code remains readable and maintainable. It treats testing as a first-class citizen, providing integrated testing utilities to make unit and integration testing efficient and simple. Additionally, the framework's modular nature allows for extensive customization via its plugin ecosystem, supporting diverse requirements ranging from database ORMs like TypeORM, Prisma, and Mongoose to authentication schemes like OIDC, Passport.js, and Keycloak.

Some of the key features are:

• Dependency Injection: A powerful IoC container that simplifies managing complex component dependencies.
• Decorators-based Architecture: Leverages TypeScript decorators for defining controllers, routes, models, and providers to reduce boilerplate.
• Input Validation & Modeling: Built-in support for JSON Schema and OpenAPI generation, ensuring type safety and automated documentation.
• Platform Abstraction: Seamlessly switch between Express.js, Koa.js, Fastify.js, or serverless architectures (e.g., AWS) using a unified API.
• AI Integration: Official support for agents and standardized configuration files to assist LLMs in generating framework-compliant code.
• Robust Middleware/Interceptor System: Easily implement cross-cutting concerns like logging, caching, and authentication with clear lifecycle hooks.
• Extensive Plugin Ecosystem: Over 100 available plugins to integrate with ORMs, GraphQL, Socket.io, and various third-party services.
• CLI Support: A dedicated command-line interface for rapid scaffolding of projects, controllers, models, and other resources.

The framework is typically used by initializing a project with the Ts.ED CLI, which generates a conventional structure tailored to the developer's choice of platform and tools. Once initialized, developers define controllers to handle incoming requests and services to contain business logic, leveraging the dependency injection system to wire these components together. The framework's modularity means developers can add features like authentication or database persistence by installing the corresponding plugins and configuring them within the server definition, which is itself a TypeScript class decorated with metadata.

Some common use cases include:

• Scalable RESTful APIs: Developing complex, enterprise-grade backends that require robust validation and structured documentation.
• Serverless Applications: Deploying serverless functions on platforms like AWS while maintaining a clean, controller-based code structure.
• Fullstack TypeScript Projects: Leveraging TypeScript across front-end and back-end by sharing models and schemas defined within the framework.
• Modular Microservices: Building maintainable microservices that can be tested in isolation due to the framework's dependency injection capabilities.