import { SerializedNode, TextSerializedNode } from '../../types/serialized-node';
import { Gradient } from '../gradient';
export declare const markerDefaultAttributes: {
    markerStart: string;
    markerEnd: string;
    markerFactor: number;
};
/**
 * No need to output default value in SVG Element.
 */
export declare const defaultAttributes: Record<SerializedNode['type'], Record<string, any>>;
export declare function serializeNodesToSVGElements(nodes: SerializedNode[]): Promise<SVGElement[]>;
export declare function camelToKebabCase(str: string): string;
/**
 * Use filter to create inner shadow.
 * @see https://stackoverflow.com/questions/69799051/creating-inner-shadow-in-svg
 * @example
 * ```html
 * <circle filter="url(#filter)">
 *   <defs>
 *     <filter id="filter">
 *       <feOffset dx="10" dy="10"/>
 *     </filter>
 *   </defs>
 * </circle>
 * ```
 */
export declare function exportInnerShadow(attributes: SerializedNode, element: SVGElement, $g: SVGElement): void;
export declare function exportDropShadow(attributes: SerializedNode, element: SVGElement, $g: SVGElement): void;
export declare function createOrUpdateMultiGradient(node: SerializedNode, $def: SVGDefsElement, gradients: Gradient[]): string;
export declare function exportFillGradientOrPattern(node: SerializedNode, $el: SVGElement, $g: SVGElement): void;
export declare function exportMarker(node: SerializedNode, $el: SVGElement, $g: SVGElement): void;
export declare function exportClipOrMask(node: SerializedNode, $el: SVGElement, $g: SVGElement): Promise<void>;
export declare function exportRough(node: SerializedNode, $g: SVGElement): void;
/**
 * use <text> and <tspan> to render text.
 * @see https://developer.mozilla.org/en-US/docs/Web/SVG/Element/text#example
 */
export declare function exportText(attributes: TextSerializedNode, $g: SVGElement, element: SVGElement): void;
export declare function exportFillImage(node: SerializedNode, element: SVGElement, $g: SVGElement): Promise<void>;
export declare function isDataUrl(url: string): boolean;
export declare function isUrl(url: string): boolean;
export declare function toSVG($svg: SVGElement): string;
export declare function toSVGDataURL($svg: SVGElement): string;