/**
 * Check if a color is a valid hex color
 */
export declare function isHexColor(color: string): boolean;
/**
 * Check if a color is a valid RGB/RGBA color
 */
export declare function isRgbColor(color: string): boolean;
/**
 * Convert hex color to RGB
 */
export declare function hexToRgb(hex: string): {
    r: number;
    g: number;
    b: number;
} | null;
/**
 * Get animation duration in CSS format
 */
export declare function getAnimationDuration(speed?: 'slow' | 'normal' | 'fast' | number): string;
/**
 * Normalize size value to CSS string
 * Supports size presets ('xs', 'sm', 'md', 'lg', 'xl'), numeric values, or CSS strings
 */
export declare function normalizeSize(size?: 'xs' | 'sm' | 'md' | 'lg' | 'xl' | number | string): string;
/**
 * Safely parse size to number with fallback
 */
export declare function parseSizeToNumber(size: number | string | undefined, fallback: number): number;
/**
 * Calculate relative luminance of a color (0-1 scale)
 * Used for determining if text should be light or dark for contrast
 */
export declare function getColorLuminance(color: string): number;
/**
 * Get contrast color (black or white) based on background luminance
 */
export declare function getContrastColor(backgroundColor: string): string;
/**
 * Parse an animation duration string (e.g. "1s", "500ms", "0.01ms") to milliseconds.
 * Handles: "1s", "2s", "0.5s", "500ms", "0.01ms", or bare numbers.
 */
export declare function parseDurationMs(duration: string): number;
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