import { FlattenSimpleInterpolation } from 'styled-components';
/**
 * Interface that is returned by our `generateFontSize`, letterSpacing needs to
 * be a string, since it also can be negative, etc.
 */
interface IGenerateFontSize {
    fontSize: number;
    lineHeight: number;
    letterSpacing: string;
}
/**
 * Generate the dynamic font metrics and get an object in return.
 *
 * @param size
 * @param lineHeightMultiplier
 *
 * @returns IGenerateFontSize
 */
export declare function generateFontSize(size: number, lineHeightMultiplier?: number): IGenerateFontSize;
/**
 * Generate a font size using this function, and get a styled-components `css`
 * template literal
 *
 * @param size
 * @param lineHeightMultiplier
 *
 * @returns TemplateLiteral
 */
export default function fontSize(size: number, lineHeightMultiplier?: number): FlattenSimpleInterpolation;
export {};