import type { Snippet } from 'svelte';
import type { SidebarGroup } from '../Sidebar/Sidebar.svelte';
export interface AppShellContextual {
    groups: SidebarGroup[];
    value: string;
    brand?: string;
    description?: string;
    status?: string;
    parentHref?: string;
    parentLabel?: string;
    header?: Snippet;
    onchange?: (id: string) => void;
}
export type AppChromeClear = () => void;
export declare function getAppChromeEpoch(): number;
export declare class AppChrome {
    #private;
    /** Live reader so nested layouts stay reactive when `[id]` is reused. */
    source: (() => AppShellContextual | null) | null;
    get contextual(): AppShellContextual | null;
    /**
     * Register contextual sidebar. Returns a disposer that only clears if this
     * registration is still active (safe across layout navigation races).
     */
    setContextual(nav: AppShellContextual | (() => AppShellContextual | null) | null): AppChromeClear;
}
export declare function getSharedAppChrome(): AppChrome;
export declare function getAppChrome(): AppChrome;
/** Sets Svelte context and keeps `globalThis` in sync for duplicate module graphs. */
export declare function setAppChrome(chrome: AppChrome): void;