error when I was making build process with nextjs 14

[momensalama]

hello @dosu,

I tried to run npm run build and this error popped up.

here are my next.config.js configurations:

Originally posted by @momensalama in https://github.com/langchain-ai/langchainjs/issues/5161#issuecomment-2232820942

[dosubot[bot]]

Hey @momensalama, I'm here to help you with the issue you're facing. I'm a bot that can assist with bug-solving, answering questions, and becoming a contributor. Let's tackle this together while we wait for a human maintainer.

To resolve the Webpack module export issues related to the langchain package in your Next.js 14 project, you can try the following steps:

1. Update Webpack Configuration: Modify your next.config.mjs to handle the module formats used by langchain. You might need to adjust the resolve and module settings.

Here is an example of how you can adjust your next.config.mjs:

// next.config.mjs
const nextConfig = {
  webpack: (config, { isServer }) => {
    // Add .cjs and .cts extensions to resolve
    config.resolve.extensions.push('.cjs', '.cts');

    // Add a rule to handle .cjs and .cts files
    config.module.rules.push({
      test: /\.cjs$/,
      type: 'javascript/auto',
    });

    // Ensure langchain modules are properly resolved
    if (!isServer) {
      config.resolve.fullySpecified = false;
    }

    config.module.rules.push({
      test: /node_modules\/langchain/,
      resolve: {
        fullySpecified: false,
      },
    });

    return config;
  },
};

export default nextConfig;

2. Check Import Statements: Ensure that your import statements for Tool, getEncoding, BaseMemory, AsyncCaller, and compare are correct. They should look like this:

import { Tool } from "@langchain/core/tools";
import { getEncoding } from "@langchain/core/encoding";
import { BaseMemory } from "@langchain/core/memory";
import { AsyncCaller } from "@langchain/core/utils/async_caller";
import { compare } from "@langchain/core/utils/compare";

3. Install Missing Dependencies: Ensure that all required dependencies are installed. You might need to install optional dependencies if your project requires specific functionalities.

If you continue to face issues, providing more specific error messages or logs would help in diagnosing the problem further ^[1][2].

To continue talking to Dosu, mention @dosu.

[momensalama]

@dosu

I tried to follow your steps and this did not solve the problem.

here are the imports from Langchain

and here is my package.js

also here is the Updated Webpack Configuration in my next.config.mjs

[dosubot[bot]]

To further troubleshoot the Webpack module export issues with the langchain package in your Next.js 14 project, let's try a few additional steps:

1. Ensure Correct Import Paths: Verify that the import paths in your ai.ts file are correct and match the module structure of the langchain package. For example:

import { PromptTemplate } from "@langchain/core/prompts";
import { GoogleGenerativeAIEmbeddings } from "@langchain/google-genai";
import { loadQARefineChain } from "langchain/chains";
import { Document } from "langchain/document";
import { StructuredOutputParser } from "langchain/output_parsers";
import { MemoryVectorStore } from "langchain/vectorstores/memory";
import { z } from "zod";
import { groq } from "@langchain/groq";
import { ChatGroq } from "@langchain/groq";

2. Update Webpack Configuration: Ensure that your Webpack configuration is correctly handling the langchain package. Here is an updated version of your next.config.mjs:

// next.config.mjs
const nextConfig = {
  webpack: (config, { isServer }) => {
    // Add .cjs and .cts extensions to resolve
    config.resolve.extensions.push('.cjs', '.cts');

    // Add a rule to handle .cjs and .cts files
    config.module.rules.push({
      test: /\.cjs$/,
      type: 'javascript/auto',
    });

    // Ensure langchain modules are properly resolved
    if (!isServer) {
      config.resolve.fullySpecified = false;
    }

    config.module.rules.push({
      test: /node_modules\/langchain/,
      resolve: {
        fullySpecified: false,
      },
    });

    return config;
  },
};

export default nextConfig;

3. Check for Missing Dependencies: Ensure that all required dependencies are installed. Run the following command to install any missing dependencies:

npm install

4. Build LangChain Package: Ensure that the langchain package is built correctly. Run the build scripts provided in the langchain package's package.json:

npm run build:internal

5. Verify Node.js Version: Ensure that you are using a compatible version of Node.js. The langchain package requires Node.js version 18 or higher. You can check your Node.js version by running:

node -v

6. Dynamic Imports: If the issue persists, consider using dynamic imports for the problematic modules. For example:

const loadModules = async () => {
  const { PromptTemplate } = await import("@langchain/core/prompts");
  const { GoogleGenerativeAIEmbeddings } = await import("@langchain/google-genai");
  const { loadQARefineChain } = await import("langchain/chains");
  const { Document } = await import("langchain/document");
  const { StructuredOutputParser } = await import("langchain/output_parsers");
  const { MemoryVectorStore } = await import("langchain/vectorstores/memory");
  const { z } = await import("zod");
  const { groq, ChatGroq } = await import("@langchain/groq");

  // Use the imported modules here
};

These steps should help resolve the Webpack module export issues with the langchain package in your Next.js 14 project. If you continue to face issues, please provide more specific error messages or logs for further assistance.

To continue talking to Dosu, mention @dosu.

[momensalama]

@dosu

Unfortunately, all your steps did not work.

[dosubot[bot]]

Let's try a few more steps to resolve the Webpack module export issues with the langchain package in your Next.js 14 project:

1. Ensure Consistent Versions: Make sure all langchain related packages are using compatible versions. Add a "resolutions" or "overrides" field in your package.json to ensure consistency:

For yarn:

{
  "resolutions": {
    "@langchain/core": "0.1.5"
  }
}

For npm:

{
  "overrides": {
    "@langchain/core": "0.1.5"
  }
}

For pnpm:

{
  "pnpm": {
    "overrides": {
      "@langchain/core": "0.1.5"
    }
  }
}

2. Update Import Paths: Ensure that your import paths are correct and match the module structure of the langchain package. For example:

import { Tool } from "@langchain/core/tools";
import { getEncoding } from "@langchain/core/encoding";
import { BaseMemory } from "@langchain/core/memory";
import { AsyncCaller } from "@langchain/core/utils/async_caller";
import { compare } from "@langchain/core/utils/compare";

3. Dynamic Imports: Use dynamic imports for the problematic modules to ensure they are loaded correctly:

const loadModules = async () => {
  const { Tool } = await import("@langchain/core/tools");
  const { getEncoding } = await import("@langchain/core/encoding");
  const { BaseMemory } = await import("@langchain/core/memory");
  const { AsyncCaller } = await import("@langchain/core/utils/async_caller");
  const { compare } = await import("@langchain/core/utils/compare");

  // Use the imported modules here
};

4. Check for Missing Dependencies: Ensure all required dependencies are installed:

npm install

5. Verify Node.js Version: Ensure you are using Node.js version 18 or higher:

node -v

6. Update Webpack Configuration: Ensure your Webpack configuration is correctly handling the langchain package:

// next.config.mjs
const nextConfig = {
  webpack: (config, { isServer }) => {
    config.resolve.extensions.push('.cjs', '.cts');

    config.module.rules.push({
      test: /\.cjs$/,
      type: 'javascript/auto',
    });

    if (!isServer) {
      config.resolve.fullySpecified = false;
    }

    config.module.rules.push({
      test: /node_modules\/langchain/,
      resolve: {
        fullySpecified: false,
      },
    });

    return config;
  },
};

export default nextConfig;

These steps should help resolve the issues. If you continue to face problems, please provide specific error messages or logs for further assistance.

@jacoblee93, this one's a bit out of my wheelhouse, could you step in and provide your guidance?

To continue talking to Dosu, mention @dosu.

[momensalama]

@dosu

also did not work ):

[dosubot[bot]]

A maintainer has already been looped in.

To continue talking to Dosu, mention @dosu.

[momensalama]

@jacoblee93 could you help me with this error?

[momensalama]

@dosu @jacoblee93

I tried this solution https://github.com/vercel/next.js/issues/60807#issuecomment-2087055777 and it works

[dosubot[bot]]

A maintainer has already been looped in.

To continue talking to Dosu, mention @dosu.

[jacoblee93]

Ah ok good to hear!

[debsouryadatta]

@dosu @jacoblee93

I tried this solution vercel/next.js#60807 (comment) and it works

Thanks @momensalama , I was searching the fix for a long time, it did resolve🙌