yarrichar•2y ago

langchain - can't find import when doing: npm run build

I'm using langchain in one of my actions, and it works fine for local dev (i.e. when running npm run dev, but when I try and do a build with npm run build I get the following error:

- info Linting and checking validity of types ..Failed to compile.

./convex/util/pineconeUtil.ts:4:28
Type error: Cannot find module 'langchain/document_loaders' or its corresponding type declarations.

  2 | 
  3 | import { PineconeClient } from "@pinecone-database/pinecone";
> 4 | import { TextLoader } from "langchain/document_loaders";
    |                            ^
  5 | import { OpenAIEmbeddings } from "langchain/embeddings";
  6 | import { Blob } from "buffer";
  7 | import { RecursiveCharacterTextSplitter } from "langchain/text_splitter";

- info Linting and checking validity of types ..Failed to compile.

./convex/util/pineconeUtil.ts:4:28
Type error: Cannot find module 'langchain/document_loaders' or its corresponding type declarations.

  2 | 
  3 | import { PineconeClient } from "@pinecone-database/pinecone";
> 4 | import { TextLoader } from "langchain/document_loaders";
    |                            ^
  5 | import { OpenAIEmbeddings } from "langchain/embeddings";
  6 | import { Blob } from "buffer";
  7 | import { RecursiveCharacterTextSplitter } from "langchain/text_splitter";

The first line of that file is "use node". Any ideas on what I'm doing wrong / what the difference is between npm run dev and npm run build ? Thanks!

8 Replies

yarricharOP•2y ago

It's a nextjs project if that makes any difference Ok, so it looks like my imports were slightly wrong. Not sure the difference between npm run dev and npm run build here, but being more specific seemed to help. E.g. this worked

import { TextLoader } from "langchain/document_loaders/fs/text";

import { TextLoader } from "langchain/document_loaders/fs/text";

But this didnt:

import { TextLoader } from "langchain/document_loaders";

import { TextLoader } from "langchain/document_loaders";

Michael Rea•17mo ago

I'm getting the same issue with openai import { ChatCompletionCreateParams, ChatCompletionCreateParamsNonStreaming, ChatCompletionMessageParam, } from "openai/resources/chat/completions";

Joseph_Ebuka•17mo ago

Npm run dev is to open up your development server in your browser while run build is to build a production ready version of the app

Michael Rea•17mo ago

yeah, I get that. I don't understand how to bring in the type imports for production I've got around it by just using "any" for all the types but it's not ideal

Michael Rea•17mo ago

Michael Rea•17mo ago

Had to specify all the way down the folder tree, the auto suggested path was not right. Got it working now 🙂

yarricharOP•17mo ago

Not sure, my use of open ai just looks like:

"use node"

import OpenAI from "openai";

...

    const openai = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });

    const completion = await openai.chat.completions.create({

"use node"

import OpenAI from "openai";

...

    const openai = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });

    const completion = await openai.chat.completions.create({

So I'm not importing those types.... Make sure you've got "use node" at the top is a potential gotcha

ian•17mo ago

try adding this to convex.json in the root of your project:

{
  "node": {
    "externalPackages": ["langchain"]
  }
}

{
  "node": {
    "externalPackages": ["langchain"]
  }
}

to speed up building (it'll be slower the first time but then faster since it doesn't have to re-build langchain)

langchain - can't find import when doing: npm run build

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