Function createRetrievalChain

Create a retrieval chain that retrieves documents and then passes them on.

Example

// yarn add langchain @langchain/openai

import { ChatOpenAI } from "@langchain/openai";
import { pull } from "langchain/hub";
import { createRetrievalChain } from "langchain/chains/retrieval";
import { createStuffDocumentsChain } from "langchain/chains/combine_documents";

const retrievalQAChatPrompt = await pull("langchain-ai/retrieval-qa-chat");
const llm = new ChatOpenAI({});
const retriever = ...
const combineDocsChain = await createStuffDocumentsChain(...);
const retrievalChain = await createRetrievalChain({
  retriever,
  combineDocsChain,
});
const response = await chain.invoke({ input: "..." });
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