此示例介绍如何从多个文件路径加载数据。第二个参数是文件扩展名到加载器工厂的映射。每个文件将被传递给匹配的加载器，生成的文档将被连接在一起。

示例文件：

src/document_loaders/example_data/example/
├── example.txt
└── example.csv

src/document_loaders/example_data/example2/
├── example.json
└── example.jsonl

示例代码：

  JSONLoader,
  JSONLinesLoader,
} from "@langchain/classic/document_loaders/fs/json";



const loader = new MultiFileLoader(
  [
    "src/document_loaders/example_data/example/example.txt",
    "src/document_loaders/example_data/example/example.csv",
    "src/document_loaders/example_data/example2/example.json",
    "src/document_loaders/example_data/example2/example.jsonl",
  ],
  {
    ".json": (path) => new JSONLoader(path, "/texts"),
    ".jsonl": (path) => new JSONLinesLoader(path, "/html"),
    ".txt": (path) => new TextLoader(path),
    ".csv": (path) => new CSVLoader(path, "text"),
  }
);
const docs = await loader.load();
console.log({ docs });