import { ExportOptions, ExportFormat, ExportResult } from "@/types";
/**
 * Service for exporting Gantt chart as image or PDF
 * Uses html2canvas for DOM capture and jspdf for PDF generation
 */
export declare class ExportService {
    private static prepareCloneForExport;
    /**
     * Export the Gantt chart element to the specified format
     */
    static export(element: HTMLElement, options?: ExportOptions): Promise<ExportResult>;
    /**
     * Export as PNG image
     */
    private static exportAsPng;
    /**
     * Export as JPEG image
     */
    private static exportAsJpeg;
    /**
     * Export as PDF document
     */
    private static exportAsPdf;
    /**
     * Get data URL without downloading (useful for previews)
     */
    static getDataUrl(element: HTMLElement, format?: ExportFormat, options?: Omit<ExportOptions, "format" | "filename">): Promise<string | null>;
    /**
     * Get as Blob (useful for uploading or processing)
     */
    static getBlob(element: HTMLElement, format?: ExportFormat, options?: Omit<ExportOptions, "format" | "filename">): Promise<Blob | null>;
    /**
     * Copy chart to clipboard as image
     */
    static copyToClipboard(element: HTMLElement, options?: Omit<ExportOptions, "format" | "filename">): Promise<boolean>;
    /**
     * Helper to download file from data URL
     */
    private static downloadFile;
    /**
     * Dynamically load html2canvas
     */
    private static loadHtml2Canvas;
    /**
     * Dynamically load jsPDF
     */
    private static loadJsPDF;
    /**
     * Check if export dependencies are available
     */
    static checkDependencies(): Promise<{
        html2canvas: boolean;
        jspdf: boolean;
    }>;
}