import { Observable, Subscription } from 'rxjs';
export declare function dateToStr(date: Date): string | null;
export declare function strToDate(str: string): Date | null;
export declare function arrayToStr<T>(array: T[]): string;
export declare function strToArray<T>(str: string): T[];
export declare function objectToStr<T>(obj: T): string;
export declare function strToObject<T>(str: string): T;
export declare const DEBOUNCE_TIME = 500;
export declare function safeUnsub(...subscriptions: Subscription[]): void;
export declare const logAndReturnEmpty: (err: any) => Observable<never>;
export declare const byOrderIndexField: (a: any, b: any) => 1 | 0 | -1;
export declare const safeObserve: <T>(observable: Observable<T>, catcher?: (err: any) => Observable<T>) => Observable<T>;