/**
 * @fileoverview Hex → OKLCH color converter.
 * @module packages/ui/lib/color
 * @package ui
 *
 * Minimal sRGB-hex to OKLCH conversion using the OKLab color space
 * (Björn Ottosson, 2020). Used by CustomThemeInjector to let developers
 * pass any CSS color as `primary` and have it injected as the three
 * rebrand-surface variables --primary-h / --primary-c / --primary-l.
 *
 * Scope:
 *   - Parses "#RGB", "#RRGGBB", "#RGBA", "#RRGGBBAA" (alpha discarded).
 *   - Non-hex strings (oklch(…), rgb(…), hsl(…), named colors) are
 *     assumed already in a CSS-parseable form → return null to signal
 *     "use as-is" to the caller.
 *
 * Non-goals:
 *   - Gamut clamping (sRGB hex is in-gamut by definition).
 *   - Parsing rgb()/hsl()/oklch() strings (let CSS do it).
 *
 * Reference: https://bottosson.github.io/posts/oklab/
 */
/** Decomposed OKLCH triplet. Hue is in [0, 360), chroma ≥ 0, lightness in [0, 1]. */
export interface OklchTriplet {
    l: number;
    c: number;
    h: number;
}
/**
 * Convert a hex color string to an OKLCH triplet.
 *
 * @param hex - "#RGB", "#RRGGBB", "#RGBA", or "#RRGGBBAA" (alpha discarded)
 * @returns OKLCH triplet, or `null` if the input is not a parseable hex string
 */
export declare function hexToOklch(hex: string): OklchTriplet | null;
/**
 * Detect whether a string is a hex color (the only format this module converts).
 * Other CSS color formats pass through to the browser's parser.
 */
export declare function isHex(input: string): boolean;