import { Observable } from 'rxjs';
import { Period } from '../period';
import * as i0 from "@angular/core";
export declare class YearService {
    private readonly _year$;
    private readonly _period$;
    set year(value: number);
    get year$(): Observable<number>;
    get period$(): Observable<Period>;
    private static periodForYear;
    constructor();
    static ɵfac: i0.ɵɵFactoryDeclaration<YearService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<YearService>;
}