Upgrade to @langchain/openai 0.6.2 breaks AzureChatOpenAI (missing OPENAI_API_VERSION)

[Legiew]

Checked other resources

• This is a bug, not a usage question. For questions, please use the LangChain Forum (https://forum.langchain.com/).
• 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

No need to put in valid values, the error happens before invoking the final call.

await new AzureChatOpenAI({
  model: 'modelName',
  azureOpenAIBasePath: 'azureOpenAIBasePath',
  azureOpenAIApiDeploymentName: 'azureOpenAIApiDeploymentName',
  azureOpenAIApiVersion: 'azureOpenAIApiVersion',
  azureADTokenProvider: () => {
    return Promise.resolve('token');
  },
}).invoke([]);

Error Message and Stack Trace (if applicable)

Error: The OPENAI_API_VERSION environment variable is missing or empty; either provide it, or instantiate the AzureOpenAI client with an apiVersion option, like new AzureOpenAI({ apiVersion: 'My API Version' }).
at new AzureOpenAI (foo/node_modules/openai/src/azure.ts:72:13)
at ChatOpenAICompletions._getClientOptions (file://foo/node_modules/@langchain/openai/dist/azure/chat_models.js:567:27)
at ChatOpenAICompletions.completionWithRetry (file://foo/node_modules/@langchain/openai/dist/chat_models.js:1910:36)
at ChatOpenAICompletions._generate (file://foo/node_modules/@langchain/openai/dist/chat_models.js:1737:37)
at AzureChatOpenAI._generate (file://foo/node_modules/@langchain/openai/dist/chat_models.js:2664:33)
at file://foo/node_modules/@langchain/core/dist/language_models/chat_models.js:250:96
at Array.map ()
at AzureChatOpenAI._generateUncached (file://foo/node_modules/@langchain/core/dist/language_models/chat_models.js:250:67)
at async AzureChatOpenAI.invoke (file://foo/node_modules/@langchain/core/dist/language_models/chat_models.js:88:24)

Description

Follow up of #8519. After updating to "@langchain/openai": "0.6.2" the error changed from missing api key to missing api version.

System Info

"@langchain/core": "0.3.66",
"@langchain/textsplitters": "0.1.0",
"langchain": "0.3.30",

[dmtrs]

What is the previous working version? 0.5.18 ?

[Legiew]

Yes, latest of 0.5

[pvtulsiram538]

@Legiew add /deployments as suffix to open api azure url . your problem will be solved

[Legiew]

@Legiew add /deployments as suffix to open api azure url . your problem will be solved

@pvtulsiram538 We had and still have /deployments at the end of the azureOpenAIBasePath. As I wrote in the issue text it worked before with version 0.5 and stopped working without any changes on our side besides the update.

[sinedied]

I confirm that this issue, I was going here to also report it.
Whether you're using the azureOpenAIApiVersion property or AZURE_OPENAI_API_VERSION version the error is still there.

@jacoblee93 @hntrl could you have a look? This may be related to one of your latest commits changing the way options are handled.