import type { Document } from "../Node.js";
/**
 * A reader takes imports data into Document objects.
 */
export interface BaseReader {
    loadData(...args: unknown[]): Promise<Document[]>;
}
/**
 * A FileReader takes file paths and imports data into Document objects.
 */
export declare abstract class FileReader implements BaseReader {
    abstract loadDataAsContent(fileContent: Buffer, fileName?: string): Promise<Document[]>;
    loadData(filePath: string): Promise<Document[]>;
    static addMetaData(filePath: string): (doc: Document, index: number) => void;
}
export type ResultType = "text" | "markdown" | "json";
export type Language = "abq" | "ady" | "af" | "ang" | "ar" | "as" | "ava" | "az" | "be" | "bg" | "bh" | "bho" | "bn" | "bs" | "ch_sim" | "ch_tra" | "che" | "cs" | "cy" | "da" | "dar" | "de" | "en" | "es" | "et" | "fa" | "fr" | "ga" | "gom" | "hi" | "hr" | "hu" | "id" | "inh" | "is" | "it" | "ja" | "kbd" | "kn" | "ko" | "ku" | "la" | "lbe" | "lez" | "lt" | "lv" | "mah" | "mai" | "mi" | "mn" | "mr" | "ms" | "mt" | "ne" | "new" | "nl" | "no" | "oc" | "pi" | "pl" | "pt" | "ro" | "ru" | "rs_cyrillic" | "rs_latin" | "sck" | "sk" | "sl" | "sq" | "sv" | "sw" | "ta" | "tab" | "te" | "th" | "tjk" | "tl" | "tr" | "ug" | "uk" | "ur" | "uz" | "vi";