import { Observable } from '@datadog/browser-core';
import type { RumConfiguration } from '../domain/configuration';
export interface ViewportDimension {
    height: number;
    width: number;
}
export declare function initViewportObservable(configuration: RumConfiguration): Observable<ViewportDimension>;
export declare function createViewportObservable(configuration: RumConfiguration): Observable<ViewportDimension>;
export declare function getViewportDimension(): ViewportDimension;