export interface TransformOpts {
    optimizeCss?: boolean;
    classNameCompressionMap?: Record<string, string>;
    increaseSpecificity?: boolean;
    sortAtRules?: boolean;
    sortShorthand?: boolean;
    classHashPrefix?: string;
    flattenMultipleSelectors?: boolean;
}
/**
 * Will transform CSS into multiple CSS sheets.
 *
 * @param css CSS string
 * @param opts Transformation options
 */
export declare const transformCss: (css: string, opts: TransformOpts) => {
    sheets: string[];
    classNames: string[];
};