Cannot install langchain package using npm: TypeError: Cannot read properties of null (reading 'edgesOut')

[kareldonk]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain.js documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain.js rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

None

Error Message and Stack Trace (if applicable)

npm http fetch GET 200 https://registry.npmjs.org/youtubei.js 6ms (cache hit)
npm verbose stack TypeError: Cannot read properties of null (reading 'edgesOut')
npm verbose stack at #loadPeerSet (C:\Program Files\nodejs\node_modules\npm\node_modules@npmcli\arborist\lib\arborist\build-ideal-tree.js:1286:38)
npm verbose stack at async #buildDepStep (C:\Program Files\nodejs\node_modules\npm\node_modules@npmcli\arborist\lib\arborist\build-ideal-tree.js:901:11)
npm verbose stack at async Arborist.buildIdealTree (C:\Program Files\nodejs\node_modules\npm\node_modules@npmcli\arborist\lib\arborist\build-ideal-tree.js:181:7)
npm verbose stack at async Promise.all (index 1)
npm verbose stack at async Arborist.reify (C:\Program Files\nodejs\node_modules\npm\node_modules@npmcli\arborist\lib\arborist\reify.js:131:5)
npm verbose stack at async Install.exec (C:\Program Files\nodejs\node_modules\npm\lib\commands\install.js:150:5)
npm verbose stack at async Npm.exec (C:\Program Files\nodejs\node_modules\npm\lib\npm.js:207:9)
npm verbose stack at async module.exports (C:\Program Files\nodejs\node_modules\npm\lib\cli\entry.js:74:5)
npm error Cannot read properties of null (reading 'edgesOut')
npm verbose cwd C:\Dev\test
npm verbose os Windows_NT 10.0.19045
npm verbose node v20.17.0
npm verbose npm v10.8.2
npm notice

Description

In a new node.js project with no dependencies, I try to install langchain using the following command:

npm i langchain

Then I eventually get the following error:

npm http fetch GET 200 https://registry.npmjs.org/youtubei.js 6ms (cache hit)
npm verbose stack TypeError: Cannot read properties of null (reading 'edgesOut')
npm verbose stack     at #loadPeerSet (C:\Program Files\nodejs\node_modules\npm\node_modules\@npmcli\arborist\lib\arborist\build-ideal-tree.js:1286:38)
npm verbose stack     at async #buildDepStep (C:\Program Files\nodejs\node_modules\npm\node_modules\@npmcli\arborist\lib\arborist\build-ideal-tree.js:901:11)
npm verbose stack     at async Arborist.buildIdealTree (C:\Program Files\nodejs\node_modules\npm\node_modules\@npmcli\arborist\lib\arborist\build-ideal-tree.js:181:7)
npm verbose stack     at async Promise.all (index 1)
npm verbose stack     at async Arborist.reify (C:\Program Files\nodejs\node_modules\npm\node_modules\@npmcli\arborist\lib\arborist\reify.js:131:5)
npm verbose stack     at async Install.exec (C:\Program Files\nodejs\node_modules\npm\lib\commands\install.js:150:5)
npm verbose stack     at async Npm.exec (C:\Program Files\nodejs\node_modules\npm\lib\npm.js:207:9)
npm verbose stack     at async module.exports (C:\Program Files\nodejs\node_modules\npm\lib\cli\entry.js:74:5)
npm error Cannot read properties of null (reading 'edgesOut')
npm verbose cwd C:\Dev\test
npm verbose os Windows_NT 10.0.19045
npm verbose node v20.17.0
npm verbose npm  v10.8.2
npm notice

System Info

Windows_NT 10.0.19045
node v20.17.0
npm v10.8.2

[dosubot]

I found a similar issue that might be related to the problem you're experiencing:

1. npm error @langchain/community v3.0.0 "Cannot read properties of null (reading 'edgesOut')" (closed)

   • Solution:
     • Ensure you are using the latest versions of npm and Node.js.
     • Check for any conflicts with other dependencies in your project.
     • Try installing the package in a clean environment to rule out local issues.
     • Check the peer dependencies specified in the package.json of @langchain/community version 0.3.0 and later to identify any potential conflicts.

2. Error on install since yesterday for cloudflare langchain (open)

   • Solution:
     • Check if the issue persists with the latest versions of these packages.
     • Ensure that there are no conflicts with other dependencies in your project.

To troubleshoot your issue, you can try the following steps:

1. Update npm and Node.js:
   Ensure you are using the latest versions of npm and Node.js. You are already using Node.js v20.17.0 and npm v10.8.2, which are recent versions, so this step might not be necessary.

2. Check for Dependency Conflicts:
   Since you mentioned this is a new project with no dependencies, this step might not be relevant. However, if you have any global npm packages that might conflict, consider checking them.

3. Install in a Clean Environment:
   Create a new project directory and try installing the langchain package again:

   mkdir new-project
   cd new-project
   npm init -y
   npm install langchain

4. Check Peer Dependencies:
   Ensure that the peer dependencies specified in the package.json of the langchain package are compatible. Here are the peer dependencies for langchain:

   {
     "@langchain/anthropic": "*",
     "@langchain/aws": "*",
     "@langchain/cohere": "*",
     "@langchain/community": "*",
     "@langchain/core": ">=0.2.21 <0.4.0",
     "@langchain/google-genai": "*",
     "@langchain/google-vertexai": "*",
     "@langchain/groq": "*",
     "@langchain/mistralai": "*",
     "@langchain/ollama": "*",
     "axios": "*",
     "cheerio": "*",
     "handlebars": "^4.7.8",
     "peggy": "^3.0.2",
     "typeorm": "*"
   }

If the issue persists, you might want to follow the discussion in the related issues for any updates or additional solutions.

To continue talking to Dosu, mention @dosu.

[kareldonk]

#3 installing in clean environment does not help. neither do the other suggestions.

[BeRecursive22]

@kareldonk I tried to install it and been thrown same errors.

[kareldonk]

For some reason adding the --legacy-peer-deps CLI argument makes it work.

npm i langchain --legacy-peer-deps

[WanielDeiss]

I get the same error, even with older langchain versions. I have the latest Node & NPM version and want to install it in a fresh project without other dependencies. Here is a screenshot.

Node: 22.8.0
NPM: 10.8.3
macOS Sonoma 14.2.1

[brianpursley]

Same problem here on Ubuntu 22.04.5.

I also tried a few previous npm versions with no success.

By the way, yarn add langchain works, so I guess this problem is specific to npm somehow.

[pablobesada]

same problem here in multiple linux versions and MacOS

[BeRecursive22]

MacOs M1 Air

same problem. Not even able to navigate the code...it's freezing my terminal probably due to the size of the project.

[Valeriamelly]

@kareldonk true, I had the same error, then I tried your suggest

[danstarns]

+1

Error log:

833 verbose stack TypeError: Cannot read properties of null (reading 'edgesOut')
833 verbose stack     at #loadPeerSet (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1286:38)
833 verbose stack     at async #buildDepStep (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:901:11)
833 verbose stack     at async Arborist.buildIdealTree (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:181:7)
833 verbose stack     at async Promise.all (index 1)
833 verbose stack     at async Arborist.reify (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:131:5)
833 verbose stack     at async Install.exec (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/lib/commands/install.js:150:5)
833 verbose stack     at async Npm.exec (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/lib/npm.js:207:9)
833 verbose stack     at async module.exports (/Users/danielstarns/.nvm/versions/node/v22.4.1/lib/node_modules/npm/lib/cli/entry.js:74:5)
834 error Cannot read properties of null (reading 'edgesOut')

Running with --legacy-peer works:

npm i langchain --legacy-peer-deps

[jacoblee93]

Hey folks, looking into this - this is quite odd!

[jacoblee93]

So I initially thought this was related to 0.3.0, but I can run:

$ npm i @langchain/core@0.1.28

But not:

$ npm i @langchain/core@0.1.29

Investigating why this suddenly started failing...

[jacoblee93]

Ok, it seems npm changed something with how they handle peer dependencies internally - we have a circular peer dependency in a subpackage on @langchain/core, and hard-locking it to a version before the circular peer dep works.

As a workaround, try @danstarns' comment:

npm i langchain --legacy-peer-deps

Or switch to yarn/pnpm. Will continue to work towards a resolution here.

[jacoblee93]

Hey folks, have just cut @langchain/core@0.3.1 and langchain@0.3.2 - can you try again and let me know if that fixes it?

I'll also cut new 0.2 versions of the above packages shortly in case you don't want to update to latest.

[tro9999]

clean install 0.3.2 works ok

[WanielDeiss]

Hey folks, have just cut @langchain/core@0.3.1 and langchain@0.3.2 - can you try again and let me know if that fixes it?

I'll also cut new 0.2 versions of the above packages shortly in case you don't want to update to latest.

works for me now! thanks

[danstarns]

Fixed in 0.3.2. Thanks @jacoblee93 <3

[jacoblee93]

Thanks for reporting all! This was a super bizarre coincidence with 0.3.

[Valeriamelly]

It works too. Thankss @jacoblee93