import { InjectionToken } from '@angular/core';
import { TemplatePortal } from '@angular/cdk/portal';
import { Observable } from 'rxjs';
export interface Tab {
    portal?: TemplatePortal;
}
export interface TabNav {
    currentTab?: Tab;
    currentTabChanged: Observable<void>;
    selectTab(tab?: Tab): void;
}
export declare const TAB_NAV_TOKEN: InjectionToken<TabNav>;