import { NgDocStoreService } from '@ng-doc/app/services/store';
import { Observable, Subject } from 'rxjs';
import * as i0 from "@angular/core";
/**
 * Service for managing themes.
 */
export declare class NgDocThemeService {
    protected readonly document: Document;
    protected readonly store: NgDocStoreService;
    protected readonly change$: Subject<string | null>;
    protected readonly documentElement: HTMLElement;
    /**
     * Returns the current theme.
     */
    get currentTheme(): string | null;
    themeChanges(): Observable<string | null>;
    /**
     * Sets the theme by id.
     * @param id - Theme id. If not provided, the theme will be removed.
     */
    set(id?: string): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgDocThemeService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NgDocThemeService>;
}