import { ThemeBaseDirective } from './theme-base.directive';
import * as i0 from "@angular/core";
/**
 * A reference to the topmost theme in the app. Is needed for providing root-level services
 * that need the theme.
 */
export declare class TopLevelThemeRef {
    theme?: ThemeBaseDirective;
    setTheme(theme: ThemeBaseDirective): void;
    getTheme(): ThemeBaseDirective | undefined;
    static ɵfac: i0.ɵɵFactoryDeclaration<TopLevelThemeRef, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TopLevelThemeRef>;
}