import { NonConstructiable } from '../foundation';
export interface FontProps {
    'font-family': string[];
    'font-size': string;
    'font-style'?: string;
    'font-variant'?: string;
    'font-weight'?: string;
    'font-stretch'?: string;
    'line-height'?: string;
}
export declare class FontProps extends NonConstructiable {
    static from(cssFontProp: string): FontProps;
    /**
     * Attempt to parse a string as an identifier. Return
     * a normalized identifier, or null when the string
     * contains an invalid identifier.
     *
     */
    private static parseIdentifier;
    static validateLengthUnit(length: string, unit: string): void;
    static getLengthValue(length: string, lengthUnit: string): number;
}