HNSW Lib does not work even after installing hnswlib-node

[adityadafe]

After Installing hnswlib-node the issue persists-

[dosubot]

🤖

Hey @KaKashi1210! I'm Dosu, a friendly bot here to lend a hand with bugs, answer questions, and guide you to be an awesome contributor. While we're waiting for a human maintainer, I'm here to help. Let's dive into this together. 😊

The error you're encountering might be due to the way hnswlib-node is being imported in the HNSWLib class. The error message suggests that the hnswlib-node library is not found, which could be due to a number of reasons:

1. The hnswlib-node library is not installed. You can install it using npm install hnswlib-node.

2. The hnswlib-node library is installed, but it's not in the correct location where the code is looking for it. Make sure that the hnswlib-node library is in the node_modules directory of your project.

3. There might be an issue with the way the hnswlib-node library is being imported. The hnswlib-node library is being imported using a dynamic import statement, which might not be supported in your environment. You can try changing the dynamic import statement to a static import statement at the top of your file.

Here is the part of the code that might be causing the issue:

static async imports(): Promise<{
    HierarchicalNSW: typeof HierarchicalNSWT;
  }> {
    try {
      const {
        default: { HierarchicalNSW },
      } = await import("hnswlib-node");

      return { HierarchicalNSW };
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
    } catch (err: any) {
      throw new Error(
        `Could not import hnswlib-node. Please install hnswlib-node as a dependency with, e.g. \`npm install -S hnswlib-node\`.\n\nError: ${err?.message}`
      );
    }
  }

You can try changing the dynamic import statement to a static import statement like this:

import { HierarchicalNSW } from "hnswlib-node";

And then use HierarchicalNSW directly in your code without the need to import it dynamically.

You can find this code in the libs/langchain-community/src/vectorstores/hnswlib.ts file.

If you're still encountering issues, could you please provide more details about the error message you're seeing and the steps you're taking when the error occurs? This will help me better understand the issue and provide a more accurate solution.

Sources

• libs/langchain-community/src/vectorstores/hnswlib.ts
• libs/langchain-google-genai/package.json

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[mo29cg]

same here

[jacoblee93]

It looks like you're using bun - can you try with just base node?

It might be worth opening an issue/PR on the HNSW package for bun support.

[adityadafe]

@jacoblee93 thanks for the idea much appreciated <3

[ddosakura]

use bun 1.1.0+

[cshaxu]

same here, but I am using Node 18.18.0 - any recommendations please?