/**
 * Color utility functions for terminal 256-color palette.
 * Ported from blessed's colors.js.
 */
export declare function nameToIndex(name: string): number;
export declare function toHex(n: number): string;
export declare function indexToRGB(index: number): [number, number, number];
export declare function indexToHex(index: number): `#${string}`;
/**
 * Find the closest 256-color index for a given color.
 * Accepts: hex string (#rrggbb), color name, r/g/b numbers, or [r,g,b] array.
 */
export declare function match(r1: string): number;
export declare function match(r1: number, g1: number, b1: number): number;
export declare function match(r1: [number, number, number]): number;
export declare function match(r1: string | number | [number, number, number], g1?: any, b1?: any, lookup?: [number, number, number][]): number;
export declare function RGBtoHex(r: number, g: number, b: number): `#${string}`;
export declare function RGBtoHex(rgb: [number, number, number]): `#${string}`;
/**
 * RGB (0–255) to HSB (0–1 each).
 */
export declare function RGBtoHSB(r: number, g: number, b: number): [number, number, number];
export declare function RGBtoHSB(rgb: [number, number, number]): [number, number, number];
/**
 * HSB (0–1 each) to RGB (0–255).
 */
export declare function HSBtoRGB(h: number, s: number, v: number): [number, number, number];
export declare function HSBtoRGB(hsv: [number, number, number]): [number, number, number];
export declare function hexToRGB(hex: string): [number, number, number];
export declare function reduce(color: number, total: number): number;
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