import type { Color2DAxes, Color3DAxes, ColorChannel, ColorChannelRange, ColorInputChannel, ColorInstance, ColorOutput, ColorSliderChannel, ColorSpace } from '@primereact/types/headless/inputcolor';
export declare const isEqual: (a: unknown, b: unknown) => boolean;
declare abstract class Color {
    abstract clone(): ColorInstance;
    abstract toString(format: ColorOutput): string;
    abstract toFormat(format: ColorSpace): ColorInstance;
    abstract toJSON(): Record<string, number>;
    abstract getChannelRange(channel: ColorChannel): ColorChannelRange;
    abstract getFormat(): ColorSpace;
    abstract getChannels(): [ColorChannel, ColorChannel, ColorChannel];
    getChannelValue(channel: ColorChannel): number;
    withChannelValue(channel: ColorChannel, value: number): ColorInstance;
    getSpaceAxes(xyChannels: Color2DAxes): Color3DAxes;
    incChannelValue(channel: ColorChannel, step: number): ColorInstance;
    decChannelValue(channel: ColorChannel, step: number): ColorInstance;
}
export declare class HSBColor extends Color {
    private hue;
    private saturation;
    private brightness;
    private alpha;
    constructor(hue: number, saturation: number, brightness: number, alpha: number);
    static parse(value: string): HSBColor | undefined;
    private toRGB;
    private toHSL;
    toFormat(format: ColorSpace): ColorInstance;
    toString(format: ColorOutput): string;
    toJSON(): {
        hue: number;
        saturation: number;
        brightness: number;
        alpha: number;
    };
    clone(): ColorInstance;
    getChannelRange(channel: ColorChannel): ColorChannelRange;
    getFormat(): ColorSpace;
    getChannels(): [ColorChannel, ColorChannel, ColorChannel];
}
export declare class HSLColor extends Color {
    private hue;
    private saturation;
    private lightness;
    private alpha;
    constructor(hue: number, saturation: number, lightness: number, alpha: number);
    static parse(value: string): HSLColor | undefined;
    private toRGB;
    private toHSB;
    toFormat(format: ColorSpace): ColorInstance;
    toString(format: ColorOutput): string;
    toJSON(): Record<string, number>;
    clone(): ColorInstance;
    getChannelRange(channel: ColorChannel): ColorChannelRange;
    getFormat(): ColorSpace;
    getChannels(): [ColorChannel, ColorChannel, ColorChannel];
}
export declare class RGBColor extends Color {
    private red;
    private green;
    private blue;
    private alpha;
    constructor(red: number, green: number, blue: number, alpha: number);
    static parse(value: string): RGBColor | undefined;
    private static expandShortHex;
    private static parseHexColor;
    private static parseRgbFunction;
    private toHSB;
    private toHSL;
    private toOKLCH;
    toHexInt(): number;
    toFormat(format: ColorSpace): ColorInstance;
    toString(format: ColorOutput): string;
    toJSON(): Record<string, number>;
    clone(): ColorInstance;
    getChannelRange(channel: ColorChannel): ColorChannelRange;
    getFormat(): ColorSpace;
    getChannels(): [ColorChannel, ColorChannel, ColorChannel];
}
export declare class OKLCHColor extends Color {
    private L;
    private C;
    private H;
    private alpha;
    constructor(L: number, C: number, H: number, alpha: number);
    static parse(value: string): OKLCHColor | undefined;
    private toRGB;
    toJSON(): Record<string, number>;
    clone(): ColorInstance;
    toFormat(format: ColorSpace): ColorInstance;
    toString(format: ColorOutput): string;
    getChannelRange(channel: ColorChannel): ColorChannelRange;
    getFormat(): ColorSpace;
    getChannels(): [ColorChannel, ColorChannel, ColorChannel];
}
export declare const parseColor: (color: string) => ColorInstance;
export declare function getChannelGradient(channel: ColorSliderChannel, value: ColorInstance, orientation: 'horizontal' | 'vertical', isRtl?: boolean): string;
export declare function getChannelColor(color: ColorInstance, channel: ColorChannel): ColorInstance;
export declare function getAreaGradient(color: ColorInstance, axes: Color2DAxes): {
    '--px-area-gradient': string;
};
export declare function getInputChannelValue(color: ColorInstance, channel: ColorInputChannel, format?: ColorSpace): string;
export declare function getInputChannelRange(color: ColorInstance, channel?: ColorInputChannel): ColorChannelRange | undefined;
export {};