import { InjectionToken, Injector, OnDestroy } from '@angular/core';
import { Overlay } from '@angular/cdk/overlay';
import { ComponentType } from '@angular/cdk/portal';
import { MdcSnackbarRef } from './snackbar-ref';
import { MdcSnackbarComponent } from './snackbar.component';
import { MdcSnackbarConfig } from './snackbar-config';
/** Injection token that can be used to specify default snackbar. */
export declare const MDC_SNACKBAR_DEFAULT_OPTIONS: InjectionToken<MdcSnackbarConfig<any>>;
/** @docs-private */
export declare function MDC_SNACKBAR_DEFAULT_OPTIONS_FACTORY(): MdcSnackbarConfig;
export declare class MdcSnackbar implements OnDestroy {
    private _overlay;
    private _injector;
    private _parentSnackBar;
    private _defaultConfig;
    /**
     * Reference to the current snackbar in the view *at this level* (in the Angular injector tree).
     * If there is a parent snack-bar service, all operations should delegate to that parent
     * via `_openedSnackBarRef`.
     */
    private _snackBarRefAtThisLevel;
    /** Reference to the currently opened snackbar at *any* level. */
    get _openedSnackbarRef(): MdcSnackbarRef<any> | null;
    set _openedSnackbarRef(value: MdcSnackbarRef<any> | null);
    constructor(_overlay: Overlay, _injector: Injector, _parentSnackBar: MdcSnackbar, _defaultConfig: MdcSnackbarConfig);
    /**
     * Creates and dispatches a snackbar with a custom component for the content, removing any
     * currently opened snackbars.
     *
     * @param component Component to be instantiated.
     * @param config Extra configuration for the snackbar.
     */
    openFromComponent<T>(component: ComponentType<T>, config?: MdcSnackbarConfig): MdcSnackbarRef<T>;
    /**
     * Opens a snackbar with a message and an optional action.
     * @param message Message text.
     * @param action The label for the snackbar action.
     * @param config Additional configuration options for the snackbar.
     */
    open(message: string, action?: string, config?: MdcSnackbarConfig): MdcSnackbarRef<MdcSnackbarComponent>;
    /**
     * Dismisses the currently-visible snackbar.
     */
    dismiss(): void;
    ngOnDestroy(): void;
    /**
     * Attaches the snackbar container component to the overlay.
     */
    private _attachSnackbarContainer;
    /**
     * Places a new component or a template as the content of the snackbar container.
     */
    private _attach;
    private _loadListeners;
    /**
     * Creates a new overlay and places it in the correct location.
     * @param config The user-specified snackbar config.
     */
    private _createOverlay;
    /**
     * Creates an injector to be used inside of a snackbar component.
     * @param config Config that was used to create the snackbar.
     * @param snackbarRef Reference to the snackbar.
     */
    private _createInjector;
}