import { CSSProperties } from 'vue';
import { WatermarkProps } from './watermark.js';
export declare function toLowercaseSeparator(key: string): string;
export declare function getStyleStr(style: CSSProperties): string;
export declare function getPixelRatio(): number;
export declare function reRendering(mutation: MutationRecord, watermarkElement?: HTMLElement): boolean;
export declare function normalizeFontStyle(fontStyle?: string): string;
export declare function normalizeFontSize(fontSize?: number | string, fallback?: number): number;
export declare function hasWatermarkContent(image?: string, content?: WatermarkProps["content"]): boolean;
