Introducing HCEL: The Most Fluent Way to Build AI Pipelines in TypeScript

In the rapidly evolving landscape of AI development, orchestration is everything. As developers move from simple LLM calls to complex, multi-step agentic workflows, the need for a clean, expressive, and type-safe way to define these pipelines becomes critical. Today, we are excited to introduce HCEL (HazelJS Composable Expression Language)—a fluent, TypeScript-native DSL designed to make AI orchestration as intuitive as a standard functional chain. What is HCEL? HCEL stands for HazelJS Composable Expression Language. It is not a separate language you need to learn, but a fluent API provided by the @hazeljs/ai package. It allows you to "chain" together different AI capabilities—prompts, RAG searches, agents, and machine learning models—into a single, executable pipeline. Why HCEL? Traditional AI pipelines often suffer from "pyramid of doom" callback structures or messy async/await boilerplate for passing state between steps. HCEL solves this by providing: Fluent Method Chaining: Build c