import { InitialMessage, WidgetMessage } from './interfaces';
type MessageHandler = (event: WidgetMessage) => void;
export declare function getAppLayoutMessageHandler(): MessageHandler | undefined;
export declare function getAppLayoutInitialMessages(): Array<InitialMessage>;
export declare function pushInitialMessage(message: InitialMessage): void;
export declare function registerAppLayoutHandler(handler: MessageHandler): () => void;
export declare function clearInitialMessages(): void;
/**
 * Returns whether there is an app layout present on this page or not
 */
export declare function isAppLayoutReady(): boolean;
/**
 * Returns a promise that resolves once the app layout has loaded
 */
export declare function whenAppLayoutReady(): Promise<unknown>;
export {};