import { PDFPageProxy } from 'pdfjs-dist/types/src/display/api';
import { OCRLang, Sort } from './types';
import { CanvasApi, CanvasApiConstructor } from './canvasapi';
import { OcrApi, OcrApiConstructor } from './ocrapi';
/**
 * pdf data information per page
 */
export declare class PdfPageData {
    private page;
    private readonly canvasApi;
    private readonly ocrApi;
    /**
     * @internal
     */
    constructor(page: PDFPageProxy, canvasApi: CanvasApiConstructor<CanvasApi> | null, ocrApi: OcrApiConstructor<OcrApi> | null);
    /**
     * get the text of the page
     *
     * @param {boolean|Sort} [sort=false] - sort the text by text coordinates
     * @returns {Promise<string>} a promise that is resolved with a {string} with the extracted text of the page
     */
    toText(sort?: boolean | Sort): Promise<string>;
    /**
     * recognizes the text from the image information of this pdf page
     * requires node-canvas/node-pureimage and tesseract.js as additional installation
     *
     * @param {OCRLang[]} langs - the language traineddata used for recognition
     * @returns {Promise<string>} the result as text
     */
    ocr(langs: OCRLang[]): Promise<string>;
    /**
     * creates a canvas and renders
     *
     * @param {T} canvasApi - the canvas api that is used to create the canvas
     * @returns {Promise<T>} the canvas
     */
    toCanvasApi<T extends CanvasApi>(canvasApi: CanvasApiConstructor<T>): Promise<T>;
    /**
     * converts to a jpeg image
     *
     * @param {number} [quality=0.8] - the quality of the image (0.0-1.0)
     * @returns {Promise<Buffer>} the jpeg image as a {Buffer}
     */
    toJPEG(quality?: number): Promise<Buffer>;
    /**
     * converts to a png image
     *
     * @returns {Promise<Buffer>} the png image as a {Buffer}
     */
    toPNG(): Promise<Buffer>;
    /**
     * close the page data
     * @returns {boolean} — if close was successfully
     */
    close(): boolean;
}