import { ThemeColor } from '../../../services/color/index';
import * as i0 from "@angular/core";
export declare class ContrastService {
    /**
     * Calculate the contract ratio between two colors.
     * This uses the official WCAG Color Contrast Ratio
     * Algorithm: https://www.w3.org/TR/WCAG20-TECHS/G17.html
     */
    getContrastColor(backgroundColor: ThemeColor, lightColor: ThemeColor, darkColor: ThemeColor): ThemeColor;
    private getLuminance;
    static ɵfac: i0.ɵɵFactoryDeclaration<ContrastService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ContrastService>;
}