import { DatePipe } from '@angular/common';
import { Observable, ReplaySubject } from 'rxjs';
import { TranslatePipe } from '../translate';
import * as i0 from "@angular/core";
/**
 * Date and time spec: https://docs.google.com/document/d/1VNtaS9_jmbcWRqYi3EkCk925rvTP1kczD73cD732-KM
 *
 * DATE_FORMAT:
 *  - human:
 *      - format few seconds/minutes ago as relative time like 'Just now' or '10 minutes ago'
 *      - format today/yesterday as human date like 'Today, 8:13AM'
 *      - format date before yesterday like 'Dec 31, 2017'
 *  - numerical:
 *      - format date as numerical date like '12/31/2017'
 */
export type DateFormat = 'human' | 'numerical';
export declare class StringMap {
    yesterday: {
        key: string;
        value: string;
    };
    fewSecondsAgo: {
        key: string;
        value: string;
    };
    oneMinuteAgo: {
        key: string;
        value: string;
    };
    minutesAgo: {
        key: string;
        value: string;
    };
    at: {
        key: string;
        value: string;
    };
    constructor(translateMap?: {
        [key: string]: string;
    });
}
export declare class DateTimeService {
    private translate;
    private locale;
    strings: ReplaySubject<StringMap>;
    localeDatePipe: DatePipe;
    cache: {
        [key: string]: string | null;
    };
    numericalFormat: string;
    constructor(translate: TranslatePipe, locale: string);
    /**
     * Returns an observable containing the formatted date as a string.
     * @param timestamp: string representation of a date which can be used with `new Date(timestamp)`
     * (timestamp coming directly from backend can be used). All timestamp should have a timezone set so final date is correct.
     * @param format: format to use.
     * @param dateOnly: false by default
     * @param displaySeconds: false by default
     */
    getFormattedDate(timestamp: string, format: DateFormat, dateOnly?: boolean, displaySeconds?: boolean): Observable<string | null>;
    private getNumericalDate;
    private getHumanDate;
    private getFormattedTime;
    private transform;
    static ɵfac: i0.ɵɵFactoryDeclaration<DateTimeService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DateTimeService>;
}