export interface WatcherFn<T> {
    (newValue: T, oldValue: T): void;
}
export interface Catcher {
    (error: Error, details: ErrorDetails): void;
}
export interface ErrorDetails {
    oldValue?: any;
    newValue?: any;
}
export declare class HvDispatcher {
    private watcherSets;
    private lastErrorDetails;
    watch(hvId: number, fn: WatcherFn<any>): number;
    unwatch(hvId: number, watcherId: number): void;
    catch(hvId: number, catcher: Catcher): void;
    handle(hvId: number, newValue: any, oldValue: any): void;
    fail(hvId: number, error: Error, details?: ErrorDetails): void;
}
export declare const globalDispatcher: HvDispatcher;