import type { ContentSlotEntry, DetailsSlotEntry, HeaderSlotEntry, SidebarSlotEntry } from './slot-config.js';
/** @internal */
export interface SlotRegistryState {
    header: HeaderSlotEntry | null;
    sidebar: SidebarSlotEntry | null;
    content: ContentSlotEntry | null;
    details: DetailsSlotEntry | null;
}
/**
 * Identity of the element that currently holds a slot. Compared by reference,
 * so each slot component must hold one value for its whole lifetime.
 *
 * @internal
 */
export type SlotOwner = object;
/** @internal */
export interface SlotRegistry {
    subscribe: (listener: () => void) => () => void;
    getSnapshot: () => SlotRegistryState;
    register: <K extends keyof SlotRegistryState>(slot: K, entry: NonNullable<SlotRegistryState[K]>, owner: SlotOwner) => void;
    unregister: (slot: keyof SlotRegistryState, owner: SlotOwner) => void;
}
/** @internal */
export declare function createSlotRegistry(): SlotRegistry;
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