/**
 * Colour source for the cones.
 * - `spectrum`: six hues spread across the whole wheel
 * - `accent`: six neighbouring hues derived from `--tx-color-primary`
 */
export type PrismGlowPalette = 'spectrum' | 'accent';
/** The edge the cones rise from. They travel left to right either way. */
export type PrismGlowPlacement = 'bottom' | 'top';
export interface PrismGlowProps {
    /**
     * Shows the glow. Turning it off fades the light layer out and then unmounts it,
     * so nothing keeps animating while it is off.
     * @default true
     */
    active?: boolean;
    /**
     * Full spectrum, or hues derived from `--tx-color-primary`.
     * @default 'spectrum'
     */
    palette?: PrismGlowPalette;
    /**
     * The edge the light rises from.
     * @default 'bottom'
     */
    placement?: PrismGlowPlacement;
    /**
     * Opacity of the light layer, 0–1; values outside are clamped. The slot content is unaffected.
     * @default 1
     */
    intensity?: number;
    /**
     * Base flow period in seconds; smaller is faster. Each cone runs its own multiple of it.
     * Values that are not a positive number fall back to the default.
     * @default 6
     */
    duration?: number;
    /**
     * Retracts the light the moment the watched box grows taller (by more than 8px, so a font
     * swap's reflow does not count), instead of fading it out:
     * content arriving under a loading surface should not share the frame with the glow. Growth
     * during a fade-out retracts it the same way. It stays off until `active` is switched off and
     * on again. Shrinking never triggers it.
     * @default true
     */
    collapseOnGrow?: boolean;
    /**
     * The element whose height `collapseOnGrow` watches. Defaults to the component root, which
     * is the host in both the wrapper and the overlay usage. Point it at an outer container when
     * the glow sits in a part of it that never grows, such as a fixed-height header.
     */
    growTarget?: HTMLElement | null;
}