Type 'FewShotChatMessagePromptTemplate<any, any>' is not assignable to type 'ChatPromptTemplate<InputValues, string> | BaseMessagePromptTemplateLike'.

[youngsupchoi]

Checked other resources

• I added a very descriptive title to this question.
• I searched the LangChain documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.

Commit to Help

• I commit to help with one of those options 👆

Example Code

import { ChatOpenAI } from "@langchain/openai";
import {
  ChatPromptTemplate,
  FewShotChatMessagePromptTemplate,
} from "@langchain/core/prompts";

const chat = new ChatOpenAI({});

const examples = [
  { input: "2+2", output: "4" },
  { input: "2+3", output: "5" },
];

const examplePrompt = ChatPromptTemplate.fromMessages([
  ["human", "{input}"],
  ["ai", "{output}"],
]);

const fewShotPrompt = new FewShotChatMessagePromptTemplate({
  examplePrompt,
  examples,
  inputVariables: ["input"],
});

const finalPrompt = ChatPromptTemplate.fromMessages([
  ["system", "You are a trustworthy AI assistant."],
  fewShotPrompt,
  ["human", "{input}"],
]);

const formattedPrompt = await finalPrompt.format({
  input: "What is 2+2?",
});

Type 'FewShotChatMessagePromptTemplate<any, any>' is not assignable to type 'ChatPromptTemplate<InputValues, string> | BaseMessagePromptTemplateLike'.
  Type 'FewShotChatMessagePromptTemplate<any, any>' is missing the following properties from type 'ChatPromptTemplate<InputValues, string>': promptMessages, _parseImagePromptsts(2322)

Description

https://www.youtube.com/watch?v=5ozH2z_vtj4&list=PLbGui_ZYuhigsI3cWlv-Dl3_R7CDNQR0u&index=8

I followed the instructions in the YouTube video exactly, but I am experiencing a bug like the one mentioned above. I have been trying to resolve this bug for 10 hours but haven't been able to fix it yet, so I need your help.

Additionally, I am curious about something mentioned in the video. It refers to a langchain version 0.1.9, but such a version does not exist.

System Info

"@langchain/openai": "^0.0.28",
"langchain": "^0.1.36",

node -v
v20.5.1

[dosubot[bot]]

To address the TypeScript error you're encountering with FewShotChatMessagePromptTemplate not being assignable to the expected type by ChatPromptTemplate, here are specific steps you can take:

1. Check Compatibility: Ensure your project's dependencies are compatible. The versions of @langchain/openai and @langchain/core should be aligned with each other. If there's a specific version requirement for compatibility, make sure your project meets it.

2. Update Libraries: If the issue might be due to outdated versions, consider updating @langchain/openai and @langchain/core to the latest versions. Use npm or yarn to update your dependencies.

3. Review Documentation: Look into the documentation or release notes for both libraries. Changes in FewShotChatMessagePromptTemplate or related types might have been documented, which could help resolve the issue.

4. Type Augmentation: If necessary, augment the existing types or create a custom interface that extends the provided types with any missing properties. This can help align your usage with the expected types.

5. Type Assertion: As a workaround, you can use type assertion to bypass the TypeScript error. This should be done with caution, as it overrides type safety.

Regarding the langchain version 0.1.9 mentioned in the video, it seems there might be a typo or misunderstanding. It's important to rely on the official documentation or repository for accurate version information.

These steps should help you resolve the TypeScript error and align your project with the expected types and versions.

Details

Sources

• type error in get started tutorial.
• langchain/src/prompts/few_shot.ts
• langchain-core/src/prompts/few_shot.ts
• langchain-core/src/prompts/serde.ts
• libs/langchain-openai/package.json
• langchain/src/prompts/index.ts
• langchain-core/src/prompts/chat.ts

About Dosu
This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

To continue the conversation, mention @dosu.