/**
 * `useThemeColors()` — resolve the *active, scoped* theme palette to concrete
 * color values for consumers that can't read CSS custom properties.
 *
 * Native widgets are the audience: platform text inputs, `<sigx-richtext>`,
 * SVG fills — anything where `var(--color-*)` never resolves because the
 * value is consumed outside Lynx's CSS pipeline. Components pass these
 * resolved literals via inline `style` or native props instead.
 *
 * Scoped + reactive: resolves through `useTheme()` (the nearest
 * `<ThemeProvider>`'s controller, falling back to the global one), and the
 * getters read `theme.name` — call them inside render and a theme switch
 * recolors the consumer.
 *
 * ```tsx
 * const colors = useThemeColors();
 * return () => (
 *   <input style={{
 *     color: colors.colorOf('base-content'),
 *     '-x-placeholder-color': colors.colorOf('base-content', 0.45),
 *   }} />
 * );
 * ```
 */
import type { ColorToken } from '../contract.js';
export interface ThemeColors {
    /**
     * The active palette's value for `token`, normalized to hex — optionally
     * with `alpha` (0–1) appended as a hex byte (`#RRGGBBAA`). Returns `''`
     * when no theme is registered yet (pre-DS-import edge case).
     */
    colorOf(token: ColorToken, alpha?: number): string;
}
export declare function useThemeColors(): ThemeColors;
/**
 * Normalize an engine-safe palette color to full-form hex
 * (`#RRGGBB`/`#RRGGBBAA`) — the registry allows `rgb()`/`rgba()` entries and
 * shorthand hex, but native color parsers may accept only the full forms.
 * Unknown notations pass through unchanged.
 */
export declare function toHexColor(color: string): string;
/**
 * Append an alpha channel (0–1) to a hex color
 * (`#RGB`/`#RRGGBB`/`#RRGGBBAA` → `#RRGGBBAA`). Non-hex input passes
 * through unchanged; non-finite alpha is treated as opaque.
 */
export declare function withAlpha(hex: string, alpha: number): string;
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