import { Document } from "@langchain/core/documents";
import { TextSplitter } from "../text_splitter.js";
/**
 * Interface that defines the methods for loading and splitting documents.
 */
export interface DocumentLoader {
    load(): Promise<Document[]>;
    loadAndSplit(textSplitter?: TextSplitter): Promise<Document[]>;
}
/**
 * Abstract class that provides a default implementation for the
 * loadAndSplit() method from the DocumentLoader interface. The load()
 * method is left abstract and needs to be implemented by subclasses.
 */
export declare abstract class BaseDocumentLoader implements DocumentLoader {
    /**
     * Loads the documents.
     * @returns A Promise that resolves with an array of Document instances.
     */
    abstract load(): Promise<Document[]>;
    /**
     * Loads the documents and splits them using a specified text splitter.
     * @param textSplitter The TextSplitter instance to use for splitting the loaded documents. Defaults to a RecursiveCharacterTextSplitter instance.
     * @returns A Promise that resolves with an array of Document instances, each split according to the provided TextSplitter.
     */
    loadAndSplit(splitter?: TextSplitter): Promise<Document[]>;
}