import { IWcagValidation, IRgb, IValidationOptions } from "./types";
export declare class ContrastRatioChecker {
    private PX_TO_PT_RATIO;
    constructor();
    private isValidHex;
    private getFullHex;
    private separateStringPerCharGroup;
    private convertHexToRgb;
    private getRelativeLuminanceComponent;
    getLuminance(rgb: IRgb): number;
    getContrastRatioByLuminance(l1: number, l2: number): number;
    getContrastRatioByRgb(rgb1: IRgb, rgb2: IRgb): number;
    getContrastRatioByHex(hex1: string, hex2: string): number;
    private getWcagLargeTextValidation;
    private getCustomRatioValidation;
    getWcagRatioValidation(ratio: number, fontSizePx?: number, bold?: Boolean): IWcagValidation;
    getRatioValidationByRgb(rgb1: IRgb, rgb2: IRgb, options?: IValidationOptions | null): IWcagValidation;
    getRatioValidationByHex(hex1: string, hex2: string, options?: IValidationOptions | null): IWcagValidation;
}