Every RAG tutorial I found looked like this:
const chain = RetrievalQAChain.fromLLM(model, vectorStore.asRetriever());
const res = await chain.call({ query: "what is this document about?" });
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I Built a RAG Pipeline in TypeScript Without LangChain — The Whole Thing in 200 Lines
A retrieval pipeline built by hand in six files — the data structures behind each stage, the four bugs that cost me the most time, and the answer it made up that I left in the repo.
4,731 words~22 min read
