/** converting camel-cased strings to be lowercase and link it with Separator */
export declare function toLowercaseSeparator(key: string): string;
export declare function getStyleStr(style: React.CSSProperties): string;
/** Returns the ratio of the device's physical pixel resolution to the css pixel resolution */
export declare function getPixelRatio(): number;
/** Whether to re-render the watermark */
export declare const reRendering: (mutation: MutationRecord, isWatermarkEle: (ele: Node) => boolean) => boolean;