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