import PropTypes from 'prop-types'; export declare type ResponsiveUtilityValue = T | { xs?: T; sm?: T; md?: T; lg?: T; xl?: T; xxl?: T; }; export declare function responsivePropType(propType: any): PropTypes.Requireable; export default function createUtilityClassName(utilityValues: Record>, breakpoints?: string[], minBreakpoint?: string): string[];