import { Change, ReadonlyValue } from "./interfaces";
export declare function onBeforeUpdate(callback?: () => void): import("./interfaces").Emitter<void>;
export declare function onUpdated(callback?: () => void): import("./interfaces").Emitter<void>;
export declare function onDestroy(callback?: () => void): import("./interfaces").Emitter<unknown>;
export declare function onChanges<T>(value: ReadonlyValue<T>, callback?: (change: Change<T>) => void): import("./interfaces").Value<Change<T>>;