import { AlphaChannel } from "../util/Colors";
export declare type NamedColor = 'yellow' | 'red' | 'green' | 'blue' | 'transparent';
export declare type RGBStr = string;
export declare type RGBAStr = string;
export declare type BackgroundColor = RGBAStr | 'transparent';
export declare class HighlightColors {
    static withDefaultColor(value: NamedColor | RGBStr | undefined | null): string;
    static toBackgroundColor(value: NamedColor | RGBStr | undefined | null, alpha?: AlphaChannel): BackgroundColor;
    static toRGBA(value: RGBStr, alpha: AlphaChannel): string;
}