[BUG] incompatibility with @langchain/openai

[ujikol]

With a current (0.5,11) @langchain/openai I get the following error:

error TS2322: Type 'AzureChatOpenAI' is not assignable to type 'BaseLanguageModelInterface<any, BaseLanguageModelCallOptions>'.
Types of property 'generatePrompt' are incompatible.

    llm = new AzureChatOpenAI({
        azureOpenAIApiKey: process.env.AZURE_OPENAI_KEY,
        azureOpenAIApiInstanceName: process.env.AZURE_OPENAI_INSTANCE_NAME,
        azureOpenAIApiDeploymentName: process.env.AZURE_OPENAI_DEPLOYMENT_NAME,
        azureOpenAIApiVersion: process.env.AZURE_OPENAI_API_VERSION,
        modelName: "gpt-4o-mini",
    });
    mcpClient = new MCPAgent({ llm, client, maxSteps: 20 });

[zandko]

With a current (0.5,11) @langchain/openai I get the following error:

error TS2322: Type 'AzureChatOpenAI' is not assignable to type 'BaseLanguageModelInterface<any, BaseLanguageModelCallOptions>'. Types of property 'generatePrompt' are incompatible.

    llm = new AzureChatOpenAI({
        azureOpenAIApiKey: process.env.AZURE_OPENAI_KEY,
        azureOpenAIApiInstanceName: process.env.AZURE_OPENAI_INSTANCE_NAME,
        azureOpenAIApiDeploymentName: process.env.AZURE_OPENAI_DEPLOYMENT_NAME,
        azureOpenAIApiVersion: process.env.AZURE_OPENAI_API_VERSION,
        modelName: "gpt-4o-mini",
    });
    mcpClient = new MCPAgent({ llm, client, maxSteps: 20 });

Thanks for reporting this. I pulled down @langchain/openai@0.5.11 and tried to reproduce the TS2322 error when assigning an AzureChatOpenAI instance to a variable typed as BaseLanguageModelInterface, but I wasn’t able to trigger the issue on my end. I did upgrade all related LangChain dependencies to their latest versions, so that incompatibility should no longer occur with current releases.