import { ElementRef } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
export declare class CoreCompositionState {
    topRef: ElementRef | null;
    leftRef: ElementRef | null;
    mainRef: ElementRef | null;
    leftPartReduced$: BehaviorSubject<boolean>;
    mainViewpotY$: BehaviorSubject<number>;
    width$: BehaviorSubject<number | undefined>;
    height$: BehaviorSubject<number | undefined>;
    constructor();
}