import { ViewContainerRef } from '@angular/core';
import { AriaLivePoliteness } from '../core';
/**
 * Configuration used when opening a snack-bar.
 */
export declare class MdSnackBarConfig {
    /** The politeness level for the MdAriaLiveAnnouncer announcement. */
    politeness?: AriaLivePoliteness;
    /** Message to be announced by the MdAriaLiveAnnouncer */
    announcementMessage?: string;
    /** The view container to place the overlay for the snack bar into. */
    viewContainerRef?: ViewContainerRef;
    /** The length of time in milliseconds to wait before automatically dismissing the snack bar. */
    duration?: number;
}