hazel-js/hazeljs

Provides a modular TypeScript framework with decorator-based API routing and dependency injection, plus **HCEL** (Hazel Composable Expression Language) for fluent AI chaining across multi-provider LLMs, agents, RAG, and ML pipelines. Integrates production essentials like Prisma/TypeORM, JWT/OAuth, WebSocket/SSE, and serverless adapters, while native observability tracks cost, reasoning loops, and OTel metrics. Built-in guardrails handle PII redaction, toxicity detection, and durable workflows with idempotency and audit trails.