/// <reference types="node" />
/// <reference types="node" />
export interface PdfConvertOptions {
    /**
     * Path to ghostscript bin directory.
     * @default Included Windows version
     */
    ghostscriptPath?: string;
}
export interface Pdf2PngOptions {
    /**
     * // resolution of the output image in dpi
     * @default 600
     */
    resolution?: number;
}
export interface PdfShrinkOptions {
    /**
     * // resolution of the output image in dpi
     * @default 300
     */
    resolution?: number;
    /**
     * // pdf version of the output shrunken pdf
     * @default same-version-as-input
     */
    pdfVersion?: string;
    /**
     * // option to set the output as grey scale pdf
     * @default false
     */
    greyScale?: boolean;
}
export declare class PdfConvert {
    private readonly options;
    private readonly source;
    private tmpFile;
    /**
     * Constructs a new Convert Object
     * @param source Can be either the buffer of the data, a file path, or a web url to a file.
     * @param options Configuration object
     */
    constructor(source: Buffer | string, options?: PdfConvertOptions);
    /**
     * Convert a page to a png image.
     * @param page Page number
     * @param options Pdf2PngOptions
     * @return png image as buffer
     */
    convertPageToImage(page: number, options?: Pdf2PngOptions): Promise<Buffer>;
    /**
     *  Shrink/Compress pdf file
     * @param options PdfShrinkOptions
     * @returns shrunken pdf as buffer
     */
    shrink(options?: PdfShrinkOptions): Promise<Buffer>;
    private getFileSizeInBytes;
    getPdfVersion(): Promise<string>;
    /**
     * Gets the page count of the pdf.
     * @returns Number of pages in the pdf.
     */
    getPageCount(): Promise<number>;
    private tryParsePagesInt;
    /**
     * Writes the source file to a tmp location.
     */
    private writePDFToTemp;
    /**
     * Removes the temp file created for the PDF conversion.
     * This should be called manually in case you want to do multiple operations.
     */
    dispose(): Promise<void>;
}