import { Overlay } from '@angular/cdk/overlay';
import { Injector } from '@angular/core';
export declare class ToastService {
    private overlay;
    private parentInjector;
    constructor(overlay: Overlay, parentInjector: Injector);
    private visibleToasts;
    success(message: string): void;
    error(message: string): void;
    warning(message: string): void;
    info(message: string): void;
    private show;
    private getPositionStrategy;
}