import { OnInit, OnDestroy, ElementRef } from '@angular/core';
import { ThemeService } from './theme.service';
import { Theme } from './symbols';
export declare class ThemeDirective implements OnInit, OnDestroy {
    private _elementRef;
    private _theme;
    private _destroy$;
    constructor(_elementRef: ElementRef, _theme: ThemeService);
    ngOnInit(): void;
    ngOnDestroy(): void;
    updateTheme(theme: Theme): void;
}