langchainjs: Could not import faiss-node (NextJS) when loading from python

Hi, I know this is a duplicate of:

https://github.com/langchain-ai/langchainjs/issues/2107

However, in that issue it says that this has been resolved. While I’m on the latest release: 0.1.2

Which should have the fix for this available here: https://github.com/langchain-ai/langchainjs/pull/2178

My issue is the following: https://github.com/langchain-ai/langchainjs/issues/2107#issuecomment-1891106038

For reference, I’ll post it below:

Hi there,

I’m getting the same type of error message in my console when I try to:

const vectorstore = await FaissStore.loadFromPython("./knowledge", new OpenAIEmbeddings({
            modelName: "text-embedding-ada-002"
}));

knowledge is a folder in the root folder that includes 2 files:

index.pkl
index.faiss

I am using the following to see whether my API route in nextjs can reach the files:

const knowledge = path.resolve('./knowledge');
const filenames = fs.readdirSync(knowledge);
console.log(filenames);

this logs the actual filenames, so I know they’re there…

I’m getting the following error message in my console:

 Error: Could not import faiss-node. Please install faiss-node as a dependency with, e.g. `npm install -S faiss-node`.

Error: Cannot read properties of undefined (reading 'indexOf')
    at FaissStore.importFaiss (webpack-internal:///(rsc)/./node_modules/@langchain/community/dist/vectorstores/faiss.js:363:19)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async readIndex (webpack-internal:///(rsc)/./node_modules/@langchain/community/dist/vectorstores/faiss.js:292:37)   
    at async Promise.all (index 1)
    at async FaissStore.loadFromPython (webpack-internal:///(rsc)/./node_modules/@langchain/community/dist/vectorstores/faiss.js:295:32)
    at async POST (webpack-internal:///(rsc)/./app/api/chat/route.ts:56:29)
    at async D:\Development\Persoonlijk\gpt-creator\node_modules\next\dist\compiled\next-server\app-route.runtime.dev.js:6:63251

I’m running this on windows with npm run dev I’ve already tried installing the package, but I have no clue why my nextjs isn’t importing the files…

My node version is 20.10.0

Is there anything I can do to get this issue sorted?

It says read properties of undefined (reading ‘indexOf’) This to me indicates it can not read the ./knowledge folder with files for some reason. But I haven’t been able to figure out why yet. I could be totally wrong here though.