import { EventEmitter } from '@angular/core';
import { ActionBarLayer, ActionBarLayerModel } from './model/action-bar-layer.model';
import { ActionBarLayerRegistration, ActionBarLayerToggleRegistration } from './layer-registration';
import { BehaviorSubject, Observable } from 'rxjs';
import { ComponentType } from '@angular/cdk/portal';
export declare class ContextualActionBarService {
    constructor();
    /**
     *
     * Internal property, use at own risk.
     */
    readonly _layers: BehaviorSubject<ActionBarLayerModel[]>;
    /**
     * Internal function used to retrieve most recent layer.
     * @param group - what group to target
     */
    latest(group?: string): Observable<ActionBarLayerModel>;
    /**
     * Internal function
     * @param id id of layer to remove
     */
    _removeLayer(id: string): void;
    /**
     * Internal function
     * @param layer - The layer to add
     */
    _addLayer(layer: ActionBarLayerModel): void;
    buttonEmitter: EventEmitter<string>;
    actionEmitter: EventEmitter<[string, string]>;
    _customElement: BehaviorSubject<[string, ComponentType<any>] | undefined>;
    private applyMissingProperties;
    private validateLayer;
    /**
     * Function to register a new layer. Returns a registration
     * @param layerOptions
     */
    register(layerOptions: ActionBarLayer): ActionBarLayerRegistration;
    /**
     * Use at own risk, is set to be deprecated after next major version.
     * @param layer
     * @param toggleLayer
     */
    registerToggle(layer: ActionBarLayer, toggleLayer: ActionBarLayer): ActionBarLayerToggleRegistration;
}