/**
 * Parsed color as normalized `[r, g, b, a]` floats in `[0, 1]`.
 */
export type RGBA = [number, number, number, number];
/**
 * Parse a CSS color string into normalized `[r, g, b, a]` floats.
 *
 * Fast paths handle `#rgb`/`#rgba`/`#rrggbb`/`#rrggbbaa` and `rgb()`/`rgba()`;
 * other forms (named colors, `hsl()`, …) resolve via a cached 1×1 canvas when a
 * DOM is available. Results are cached per input string and shared by identity,
 * so callers must treat the returned array as read-only. Unparseable input
 * yields opaque black `[0, 0, 0, 1]` regardless of DOM availability.
 *
 * @param css - A CSS color string, e.g. `'#38bdf8'` or `'rgba(0,0,0,.5)'`.
 * @returns The cached `[r, g, b, a]` tuple in `[0, 1]`.
 */
export declare function parseColorToRGBA(css: string): RGBA;