export declare const onDestroy: (callback: () => void) => void;
export declare const popLastOnDestroyCallback: () => (() => void) | undefined;
type MaybePromise<T> = T | Promise<T>;
export declare const onInit: (callback: () => void) => void;
export declare const popLastOnInitCallback: () => (() => MaybePromise<void>) | undefined;
export {};