import { Options as Html2CanvasOptions } from 'html2canvas-pro';
/**
 * A drop-in wrapper around `html2canvas-pro` that first normalises modern CSS
 * colour functions (oklch/oklab/lch/lab/color()) to sRGB and applies the
 * shared CSS-preprocessing pass (backdrop-filter, mix-blend-mode, 3D
 * transforms, unsupported features) to the cloned capture document. Svelte
 * port of the vanilla binding's `renderToCanvas` wrapper
 * (`packages/vanilla/src/viewer/export/render-to-canvas.ts`); the pure
 * colour/CSS passes live once in `pptx-viewer-shared`, only this thin
 * html2canvas-pro glue is per-binding. `html2canvas-pro` is imported
 * dynamically so it stays out of the main bundle until export is actually
 * used.
 */
export declare function renderToCanvas(element: HTMLElement, options?: Partial<Html2CanvasOptions>): Promise<HTMLCanvasElement>;
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