import { ApplicationRef, EnvironmentInjector, Type } from '@angular/core';
import { DialogRef } from './dialog-ref';
import { DialogConfig } from './dialog-config';
import * as i0 from "@angular/core";
export declare class DialogService {
    private appRef;
    private envInjector;
    private stack;
    constructor(appRef: ApplicationRef, envInjector: EnvironmentInjector);
    open<T, R = any, D = any>(component: Type<T>, config?: DialogConfig<D>): DialogRef<R>;
    /** Closes the topmost open dialog, e.g. from a global Escape handler. */
    closeTop(): void;
    private injectStylesOnce;
    static ɵfac: i0.ɵɵFactoryDeclaration<DialogService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DialogService>;
}