agsamantha/node_modules/langchain/dist/chains/load.js
2024-10-02 15:15:21 -05:00

35 lines
1.3 KiB
JavaScript

import { BaseChain } from "./base.js";
import { loadFromHub } from "../util/hub.js";
import { loadFromFile } from "../util/load.js";
import { parseFileConfig } from "../util/parse.js";
const loadChainFromFile = async (file, path, values = {}) => {
const serialized = parseFileConfig(file, path);
return BaseChain.deserialize(serialized, values);
};
/**
* Load a chain from {@link https://github.com/hwchase17/langchain-hub | LangchainHub} or local filesystem.
*
* @example
* Loading from LangchainHub:
* ```ts
* import { loadChain } from "langchain/chains/load";
* const chain = await loadChain("lc://chains/hello-world/chain.json");
* const res = await chain.call({ topic: "my favorite color" });
* ```
*
* @example
* Loading from local filesystem:
* ```ts
* import { loadChain } from "langchain/chains/load";
* const chain = await loadChain("/path/to/chain.json");
* ```
*
* @deprecated Use newer {@link https://api.js.langchain.com/functions/langchain.load.load.html | load method}.
*/
export const loadChain = async (uri, values = {}) => {
const hubResult = await loadFromHub(uri, loadChainFromFile, "chains", new Set(["json", "yaml"]), values);
if (hubResult) {
return hubResult;
}
return loadFromFile(uri, loadChainFromFile, values);
};