import type { EPub } from "epub2";
import { Document } from "@langchain/core/documents";
import { BaseDocumentLoader } from "@langchain/core/document_loaders/base";
/**
 * A class that extends the `BaseDocumentLoader` class. It represents a
 * document loader that loads documents from EPUB files.
 */
export declare class EPubLoader extends BaseDocumentLoader {
    filePath: string;
    private splitChapters;
    constructor(filePath: string, { splitChapters }?: {
        splitChapters?: boolean | undefined;
    });
    /**
     * A protected method that takes an EPUB object as a parameter and returns
     * a promise that resolves to an array of objects representing the content
     * and metadata of each chapter.
     * @param epub The EPUB object to parse.
     * @returns A promise that resolves to an array of objects representing the content and metadata of each chapter.
     */
    protected parse(epub: EPub): Promise<{
        pageContent: string;
        metadata?: object;
    }[]>;
    /**
     * A method that loads the EPUB file and returns a promise that resolves
     * to an array of `Document` instances.
     * @returns A promise that resolves to an array of `Document` instances.
     */
    load(): Promise<Document[]>;
}