DOC: <Issue related to /docs/tutorials/rag/>

[vlahanas]

Problem

In the Typescript version of the documentation, the code sample that describes how to set up a RAG chain is missing a variable declaration, and throws an error. Specifically, the variable vectorStore is not defined.

Fix

What is missing is an import of some vector store and embeddings model, eg. for MemoryVectorStore with OpenAIEmbeddings this would be:

import { OpenAIEmbeddings } from "@langchain/openai";
import { MemoryVectorStore } from "langchain/vectorstores/memory";

and the definition of embeddings and vectorStore as :

const embeddings = new OpenAIEmbeddings({
    model: "text-embedding-3-large"
});

const vectorStore = new MemoryVectorStore(embeddings);