import { CSSPseudoSelectorProps, CSSSelectorObject, EmotionLabel, SystemCssProperties, VariantProperty, CSSObject } from '@styled-system/css';
import { DefaultTheme } from 'styled-components';
import { FlexboxProps, GridProps, LayoutProps, SpaceProps, TypographyProps, ColorProps } from 'styled-system';
/**
 * DISCLAIMER:
 * This file is a copy of the original (https://github.com/styled-system/styled-system/blob/master/packages/css/src/index.js)
 *
 * The only adjustment that has been made is the typings in the css function as I couldn't get a declaration file to override a the SystemStyleObject
 */
export declare const get: (obj: any, key: any, def: any, p: any, undef: any) => any;
export declare const responsive: (styles: any) => (theme: any) => {};
declare type SystemStyleObject = SystemCssProperties | SpaceProps<DefaultTheme> | TypographyProps<DefaultTheme> | FlexboxProps<DefaultTheme> | GridProps<DefaultTheme> | LayoutProps<DefaultTheme> | ColorProps<DefaultTheme> | CSSPseudoSelectorProps | CSSSelectorObject | VariantProperty | CustomUseThemeFunction | EmotionLabel | null;
interface CustomUseThemeFunction {
    (theme: DefaultTheme): SystemStyleObject;
}
declare type CssFunctionReturnType = (props?: DefaultTheme | {
    theme: DefaultTheme;
}) => CSSObject;
declare type CssFunction = (input?: SystemStyleObject) => CssFunctionReturnType;
export declare const css: CssFunction;
export default css;