import { _PointerActivityTraceSource } from "./pointer_activity";
declare class ViewportPointerTracker {
    #private;
    private readonly _broker;
    private constructor();
    static get(view: Window): ViewportPointerTracker;
    dispose(): void;
    subscribe(callback: (traceSource: _PointerActivityTraceSource) => Promise<void>): void;
    unsubscribe(callback: (traceSource: _PointerActivityTraceSource) => Promise<void>): void;
}
export { ViewportPointerTracker, };
//# sourceMappingURL=viewport_pointer_tracker.d.ts.map