import { ILayerHost } from './LayerHost.types';
/**
 * Register a layer for a given host id
 * @param hostId - Id of the layer host
 * @param layer - Layer instance
 */
export declare function registerLayer(hostId: string, callback: () => void): void;
/**
 * Unregister a layer for a given host id
 * @param hostId - Id of the layer host
 * @param layer - Layer instance
 */
export declare function unregisterLayer(hostId: string, callback: () => void): void;
/**
 * Gets the number of layers currently registered with a host id.
 * @param hostId - Id of the layer host.
 * @returns The number of layers currently registered with the host.
 */
export declare function getLayerCount(hostId: string): number;
/**
 * Gets the Layer Host instance associated with a hostId, if applicable.
 * @param hostId - Id of the layer host
 * @returns A component ref for the associated layer host.
 */
export declare function getLayerHost(hostId: string): ILayerHost | undefined;
/**
 * Registers a Layer Host with an associated hostId.
 * @param hostId - Id of the layer host
 * @param layerHost - layer host instance
 */
export declare function registerLayerHost(hostId: string, layerHost: ILayerHost): void;
/**
 * Unregisters a Layer Host from the associated hostId.
 * @param hostId - Id of the layer host
 * @param layerHost - layer host instance
 */
export declare function unregisterLayerHost(hostId: string, layerHost: ILayerHost): void;
/**
 * When no default layer host is provided, this function is executed to create the default host.
 */
export declare function createDefaultLayerHost(doc: Document, shadowRoot?: ShadowRoot | null): Node | null;
/**
 * This function can be optionally called to clean up the default layer host as needed.
 */
export declare function cleanupDefaultLayerHost(doc: Document, shadowRoot?: ShadowRoot | null): void;
/**
 * Used for notifying applicable Layers that a host is available/unavailable and to re-evaluate Layers that
 * care about the specific host.
 */
export declare function notifyHostChanged(id: string): void;
/**
 * Sets the default target selector to use when determining the host in which
 * Layered content will be injected into. If not provided, an element will be
 * created at the end of the document body.
 *
 * Passing in a falsy value will clear the default target and reset back to
 * using a created element at the end of document body.
 */
export declare function setDefaultTarget(selector?: string): void;
/**
 * Get the default target selector when determining a host
 */
export declare function getDefaultTarget(): string | undefined;