import { Store, StoreValue } from '@ngneat/elf';
import { Observable } from 'rxjs';
interface Options<S extends Store> {
    channel?: string;
    source?: (store: S) => Observable<Partial<StoreValue<S>>>;
    preUpdate?: (event: MessageEvent<Partial<StoreValue<S>>>) => Partial<StoreValue<S>>;
    runGuard?: () => boolean;
}
export declare function syncState<S extends Store>(store: S, options?: Options<S>): BroadcastChannel | undefined;
export {};