/**
 * 把任何可绘制内容放到一个 canvas 里
 * @param canvas 指定 canvas ，默认会创建一个新 canvas
 */
export declare function toCanvas(inDrawable: string | Blob | HTMLImageElement | ImageData | ImageBitmap, canvas?: HTMLCanvasElement, options?: {
    useCanvasSize?: boolean;
    clear?: boolean;
}): Promise<{
    canvas: HTMLCanvasElement;
    drawable: HTMLImageElement | ImageBitmap;
}>;
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