import { FontSizeProperty } from '@johanneslumpe/css-types';
import { StyleOptions } from '../../types';
export interface FontSizeProps<T> {
    /**
     * The **`font-size`** CSS property sets the size of the font. This property is also used to compute the size of `em`, `ex`, and other relative `<length>` units.
     *
     * @see https://developer.mozilla.org/docs/Web/CSS/font-size
     */
    style$FontSize: T;
}
export declare const fontSize: <T = FontSizeProperty<import("@johanneslumpe/css-types").Length>, Theme = never, Breakpoints = never>({ themeProp, }?: Partial<StyleOptions<FontSizeProps<T>, Theme, Extract<keyof Theme, string>>>) => (props: import("../../types").WithTheme<FontSizeProps<T>, Theme, Breakpoints>) => import("../../types").Styles | undefined;