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🦜🍎️ @langchain/core\n\n![npm](https://img.shields.io/npm/dm/@langchain/core) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain)\n\n`@langchain/core` contains the core abstractions and schemas of LangChain.js, including base classes for language models,\nchat models, vectorstores, retrievers, and runnables.\n\n## 💾 Quick Install\n\n```bash\npnpm install @langchain/core\n```\n\n## 🤔 What is this?\n\n`@langchain/core` contains the base abstractions that power the rest of the LangChain ecosystem.\nThese abstractions are designed to be as modular and simple as possible.\nExamples of these abstractions include those for language models, document loaders, embedding models, vectorstores, retrievers, and more.\nThe benefit of having these abstractions is that any provider can implement the required interface and then easily be used in the rest of the LangChain ecosystem.\n\nFor example, you can install other provider-specific packages like this:\n\n```bash\npnpm install @langchain/openai\n```\n\nAnd use them as follows:\n\n```typescript\nimport { StringOutputParser } from \"@langchain/core/output_parsers\";\nimport { ChatPromptTemplate } from \"@langchain/core/prompts\";\nimport { ChatOpenAI } from \"@langchain/openai\";\n\nconst prompt = ChatPromptTemplate.fromTemplate(\n  `Answer the following question to the best of your ability:\\n{question}`\n);\n\nconst model = new ChatOpenAI({\n  model: \"gpt-4o-mini\",\n  temperature: 0.8,\n});\n\nconst outputParser = new StringOutputParser();\n\nconst chain = prompt.pipe(model).pipe(outputParser);\n\nconst stream = await chain.stream({\n  question: \"Why is the sky blue?\",\n});\n\nfor await (const chunk of stream) {\n  console.log(chunk);\n}\n\n/*\nThe\n sky\n appears\n blue\n because\n of\n a\n phenomenon\n known\n as\n Ray\nleigh\n scattering\n*/\n```\n\nNote that for compatibility, all used LangChain packages (including the base LangChain package, which itself depends on core!) must share the same version of `@langchain/core`.\nThis means that you may need to install/resolve a specific version of `@langchain/core` that matches the dependencies of your used packages.\n\n## 📦 Creating your own package\n\nOther LangChain packages should add this package as a dependency and extend the classes within.\nFor an example, see the [@langchain/anthropic](https://github.com/langchain-ai/langchainjs/tree/main/libs/providers/langchain-anthropic) in this repo.\n\nBecause all used packages must share the same version of core, packages should never directly depend on `@langchain/core`. Instead they should have core as a peer dependency and a dev dependency. We suggest using a tilde dependency to allow for different (backwards-compatible) patch versions:\n\n```json\n{\n  \"name\": \"@langchain/anthropic\",\n  \"version\": \"0.0.3\",\n  \"description\": \"Anthropic integrations for LangChain.js\",\n  \"type\": \"module\",\n  \"author\": \"LangChain\",\n  \"license\": \"MIT\",\n  \"dependencies\": {\n    \"@anthropic-ai/sdk\": \"^0.10.0\"\n  },\n  \"peerDependencies\": {\n    \"@langchain/core\": \"~0.3.0\"\n  },\n  \"devDependencies\": {\n    \"@langchain/core\": \"~0.3.0\"\n  }\n}\n```\n\nWe suggest making all packages cross-compatible with ESM and CJS using a build step like the one in\n[@langchain/anthropic](https://github.com/langchain-ai/langchainjs/tree/main/libs/providers/langchain-anthropic), then running `pnpm build` before running `npm publish`.\n\n## 💁 Contributing\n\nBecause `@langchain/core` is a low-level package whose abstractions will change infrequently, most contributions should be made in the higher-level LangChain package.\n\nBugfixes or suggestions should be made using the same guidelines as the main package.\nSee [here](https://github.com/langchain-ai/langchainjs/tree/main/CONTRIBUTING.md) for detailed information.\n\nPlease report any security issues or concerns following our [security guidelines](https://github.com/langchain-ai/.github/blob/main/SECURITY.md).","users":{}}