import { Moment } from 'moment-timezone';
import { IAvvenimento, Avvenimento } from '../model';
/**
* @param functionToCheck  the object to check.
* @return true if `functionToCheck` is a function
* @example
* ```typescript
*  const check = isFunction(()=>));
* ```
*/
export declare function isFunction(functionToCheck: any): any;
/**
* @param array  array of promises.
* @param callback  callback for each promise.
* @return true if `functionToCheck` is a function
* @example
* ```typescript
 * const collection = [promise1, promise2];
 *
 *  let documents: any = [];
 *  await asyncForEach(collection, (docs: any) => {
 *    documents = [...documents, ...docs];
 * });
 * return documents;
 * ```    */
export declare function asyncForEach(array: any[], callback: any): Promise<void>;
/**
    * @param date  any.
    * @return instance of {@link moment.Moment} moment
    *   now() is provided when data is unparsable.
    * the {@link firebase.firestoreTimestamp.toDate()} when `date` is {@link firebase.firestoreTimestamp}
    * @example
    * ```typescript
    * const res = convertToMoment(new Date());
    * const res = convertToMoment('20201212 12:00');
    * const res = convertToMoment(firestoreTimestamp);
    * ```
    */
export declare function convertToMoment(date?: any): Moment | null;
/**
* @param array  array of any.
* @return flattened array
* @example
* ```typescript
* const array = [[1,2],[3,4]]
* const res = flattenArray(array);
*
* # output
* [1,2,3,4]
* ```
*/
export declare function flattenArray(array: any[]): never[];
/**
  * @return x.betradar_id || x.event_id;
  */
export declare const getIdOfAvvenimento: (x: IAvvenimento) => string;
export declare const getUrlOfAvvenimento: (leagueUrl: string, uid: string) => string;
/**
 * @return list of leagues
 * @example
 * ```typescript
 *  leagues = Crawler.splitByServerIndex(data);
 *
 * ```
 */
export declare function splitByServerIndex(array: any[]): any[];
export declare function shuffle(array: any[]): any[];
export declare var groupBy: (xs: any, key: any) => any;
export declare function isChanged(x: IAvvenimento, mapOfAvvenimenti: Map<string, Avvenimento>): boolean;
export declare function keepPreviousMarket(x: IAvvenimento, mapOfAvvenimenti: Map<string, Avvenimento>): void;
export declare function getCacheKey(url: string, x: Avvenimento): string;