/// <reference types="react" />
export declare function addUnit(value?: string | number): string | undefined;
export declare function kebabCase(str: string): string;
export declare function getSizeStyle(originSize?: string | number): {
    width: string | undefined;
    height: string | undefined;
} | {
    width?: undefined;
    height?: undefined;
};
export declare function getZIndexStyle(zIndex?: string | number): import("react").CSSProperties;