export type Rgb = {
    r: number;
    g: number;
    b: number;
};
export type RgbPair = {
    bg: Rgb;
    fg: Rgb;
};
export type ContrastDirection = "lighter" | "darker" | "nearest";
export type ContrastOptions = {
    ratio?: number;
    direction?: ContrastDirection;
    flexible?: boolean;
};
export declare class Chroma {
    static readonly WCAG_AA_LARGE = 3;
    static readonly WCAG_AA_NORMAL = 4.5;
    static readonly WCAG_AAA_LARGE = 4.5;
    static readonly WCAG_AAA_NORMAL = 7;
    private static validateFiniteNumber;
    private static getRandomIntRange;
    private static getRandomFloatRange;
    private static nextDown;
    private static validateRgbChannel;
    private static validateRgb;
    private static rgbChannelToLinearChannel;
    private static rgbToLinearRgb;
    private static linearRgbRelativeLuminance;
    private static linearRgbContrastRatio;
    private static validateContrastRatio;
    private static validateContrastDirection;
    private static validateBoolean;
    private static lighterRelativeLuminanceForContrastRatio;
    private static darkerRelativeLuminanceForContrastRatio;
    private static luminanceRangesForContrastRatio;
    private static linearRgbWithRelativeLuminance;
    private static linearRgbContrastAdjustment;
    private static linearChannelToEncodedRgbChannel;
    private static linearChannelToRgbChannelFloor;
    private static linearChannelToRgbChannelCeil;
    private static linearRgbToRgbFloor;
    private static linearRgbToRgbCeil;
    static randomInt(min: number, max: number): number;
    static randomFloat(min: number, max: number): number;
    static randomRgb(): Rgb;
    static rgbToCss(rgb: Rgb): string;
    static contrast(first: Rgb, second: Rgb): number;
    static meetsContrast(first: Rgb, second: Rgb, ratio?: number): boolean;
    static adjustToContrast(base: Rgb, color: Rgb, options?: ContrastOptions): Rgb;
    static randomWithContrast(base: Rgb, options?: ContrastOptions): Rgb;
    static randomPair(): RgbPair;
}
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