/**
 * @sharpee/platform-browser/channels/layout — default layout helper.
 *
 * Owner context: browser default. Constructs the platform-default DOM
 * scaffold per ADR-165 §7's slot table:
 *
 *   | Slot       | Channels rendered into it                    |
 *   | status     | location, score, turn                        |
 *   | main       | main (prose)                                 |
 *   | sidebar    | (multi-user — chat, presence)                |
 *   | input      | prompt + user input field                    |
 *   | media      | image:*, animation, transition               |
 *   | notify     | death, endgame, score_notify (toasts)        |
 *   | meta       | info, ifid (typically hidden)                |
 *
 * The helper either constructs the DOM fresh inside a host root, or
 * adopts existing elements when the host page already provides them
 * (the `BrowserClient` integration path used by the Sharpee web
 * client). Stories that replace the layout entirely skip this helper
 * and call `Renderer.registerSlot(name, handle)` directly.
 *
 * Returns a `BrowserDefaultLayout` handle the caller passes to
 * `registerDefaultBrowserRenderers`.
 */
export interface BrowserDefaultLayout {
    /** Root container — typically the page body or a dedicated mount point. */
    readonly root: HTMLElement;
    readonly status: HTMLElement;
    readonly statusLocation: HTMLElement;
    readonly statusScore: HTMLElement;
    readonly statusTurn: HTMLElement;
    readonly main: HTMLElement;
    readonly sidebar: HTMLElement;
    readonly input: HTMLInputElement;
    readonly inputPromptLabel: HTMLElement;
    readonly media: HTMLElement;
    readonly notify: HTMLElement;
    readonly meta: HTMLElement;
}
export interface MountDefaultLayoutOptions {
    /**
     * Optional document for testing (defaults to the host's
     * `globalThis.document`).
     */
    doc?: Document;
}
/**
 * Mount the platform-default layout under `root`. Constructs the
 * slot DOM if not already present. Idempotent — calling twice on
 * the same root reuses existing slots rather than creating duplicates.
 */
export declare function mountDefaultLayout(root: HTMLElement, opts?: MountDefaultLayoutOptions): BrowserDefaultLayout;
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