@beparallel/langchain-ts

A TypeScript tool for extracting Langchain prompts and generating corresponding TypeScript types.

Features

• Extracts prompts from Langchain Hub
• Generates TypeScript interfaces for prompt inputs and outputs
• Automatically handles JSON schema conversion
• Command-line interface for easy integration
• Optional filtering by prompt name and tag override

Installation

1. Install the package

pnpm i @beparallel/langchain-ts

2. Set the environment variables in your .env file

LANGCHAIN_API_KEY=your_api_key
LANGCHAIN_TAG=your_tag

3. Set up the script in your package.json file

"scripts": {
  ...
  "prompt:generate": "dotenv -f .env.* run -- npx langchain-types --file=X"
}

Where:

• X is the path to the file where you want to save the types.
• Optional: --name=Y to filter prompts by name (partial match).
• Optional: --tag=Z to override the LANGCHAIN_TAG environment variable.

4. Run the script

pnpm prompt:generate

Contributing

Installation

pnpm i

Usage

1. Add the environment variables in your .env file

LANGCHAIN_API_KEY=your_api_key
LANGCHAIN_TAG=your_tag

2. Export them

export LANGCHAIN_API_KEY=your_api_key
export LANGCHAIN_TAG=your_tag

3. Run the script

pnpm prompt:generate

Release

1. Update the version in the package.json file.
2. Run the following command to update the types.

pnpm prepublish

3. Run npm publish command

npm publish --access public

4. Commit and push the changes.
5. Create a new release on GitHub.

License

This project is licensed under the MIT License. See the LICENSE file for details.