/**
 * @sharpee/platform-browser/channels/image — `image:*` channel
 * renderers + preload.
 *
 * Owner context: browser default. Implements ADR-165 §8 image
 * behavior:
 *  - `image:<layer>` (replace, json) — mount/unmount an `<img>` at
 *    the layer's z-index in the media slot.
 *  - `image:preload` (event, json) — trigger asset prefetch via a
 *    detached `<img>` element; no visible output.
 *
 * Layer z-ordering convention (ADR-163 §11): `background < main <
 * overlay`. Custom layers above `overlay` use `data-layer` attribute
 * indices; the renderer sorts on insertion.
 *
 * Hide signal: `null` value clears the `<img>` for that layer
 * (ADR-163 §6).
 */
import type { ChannelRenderer } from '@sharpee/channel-service';
export interface ImageChannelRendererOptions {
    /**
     * Hotspot click handler. Called with the hotspot's `command` field
     * when the user clicks an `<area>` element synthesized for an image
     * with hotspots. Per ADR-163 §10, the handler routes to the
     * `Renderer.emitCommand(text)` so the engine sees a typed command.
     */
    onHotspotCommand?(command: string): void;
}
/**
 * Construct the renderer for a single `image:<layer>` channel.
 *
 * @param slot — the media slot HTMLElement (typically a positioned
 *   container so layered images stack correctly via z-index).
 * @param layer — the layer name (`background`, `main`, `overlay`,
 *   or a story-defined custom layer). Used to address the
 *   `<img>` element this renderer manages.
 */
export declare function createImageChannelRenderer(slot: HTMLElement, layer: string, opts?: ImageChannelRendererOptions): ChannelRenderer;
/**
 * `image:preload` channel renderer — event-mode. Triggers an asset
 * prefetch via a detached `<img>` element; no visible DOM output.
 */
export declare function createImagePreloadChannelRenderer(slot: HTMLElement): ChannelRenderer;
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