import { EmotionCache } from '@emotion/cache';
import type { StyleItem } from '../StyleSheet';
export declare class CssFactory {
    key: string;
    private refPropertyName;
    /**
     *  Factory for creating emotion-based `css` utilities.
     *
     * @private
     * @param key - Key/Name identifier of the CssFactory.
     */
    constructor(key?: string);
    build(cache: EmotionCache): {
        css: CSSType;
        cx: CXType;
    };
    private merge;
    /**
     * Tries to extract the 'ref' property from the specified argument.
     *
     * @param arg - Argument to extract the 'ref' property from.
     * @return {arg, ref} - Returns the extracted reference ('ref') and the specified argument 'arg' with the 'ref' property removed.
     */
    private extractRef;
}
export declare type CSSType = (styles: StyleItem[] | StyleItem) => string;
export declare type CXType = (...args: any) => string;