import { OnInit } from '@angular/core';
import { ThemeBaseDirective } from './theme-base.directive';
import * as i0 from "@angular/core";
/**
 * Checks if Sapphire theme is provided, and throws otherwise.
 * Useful to be added in hostDirectives of components.
 */
export declare class ThemeCheckDirective implements OnInit {
    private theme;
    constructor(theme: ThemeBaseDirective);
    ngOnInit(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<ThemeCheckDirective, [{ optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ThemeCheckDirective, never, never, {}, {}, never, never, true, never>;
}