import { MatSnackBar } from '@angular/material/snack-bar';
import { AlertMessageComponent } from './alert-message/alert-message.component';
import * as i0 from "@angular/core";
export declare class AlertService {
    private snackBar;
    constructor(snackBar: MatSnackBar);
    messageSuccess(message: string, duration?: number): import("@angular/material/snack-bar").MatSnackBarRef<AlertMessageComponent>;
    messageWarning(message: string, duration?: number): import("@angular/material/snack-bar").MatSnackBarRef<AlertMessageComponent>;
    messageError(message: string, duration?: number): import("@angular/material/snack-bar").MatSnackBarRef<AlertMessageComponent>;
    private open;
    static ɵfac: i0.ɵɵFactoryDeclaration<AlertService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<AlertService>;
}