This example goes over how to load data from any GitBook, using Cheerio. One document will be created for each page.

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Setup

npm
npm install @langchain/community @langchain/core cheerio

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Load from single GitBook page

import { GitbookLoader } from "@langchain/community/document_loaders/web/gitbook";

const loader = new GitbookLoader(
  "https://docs.gitbook.com/product-tour/navigation"
);

const docs = await loader.load();

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Load from all paths in a given GitBook

For this to work, the GitbookLoader needs to be initialized with the root path (https://docs.gitbook.com in this example) and have shouldLoadAllPaths set to true. 
import { GitbookLoader } from "@langchain/community/document_loaders/web/gitbook";

const loader = new GitbookLoader("https://docs.gitbook.com", {
  shouldLoadAllPaths: true,
});

const docs = await loader.load();