import { Platform } from '@angular/cdk/platform';
import { Observable } from 'rxjs';
import { ScrollbarManager } from './scrollbar-manager';
export declare class NativeScrollbarSizeFactory {
    private document;
    private manager;
    private platform;
    private _nativeScrollbarSize;
    nativeScrollbarSize: Observable<number>;
    constructor(document: any, manager: ScrollbarManager, platform: Platform);
    /**
     * Get native scrollbar size
     */
    private getNativeScrollbarSize;
}