import { BehaviorSubject, Observable } from 'rxjs';
export declare function useSyncObservable<T>(observable: Observable<T>): BehaviorSubject<T | null>;
export declare function useSyncObservable<T>(observable: BehaviorSubject<T>): BehaviorSubject<T>;
export declare function useSyncObservable<T>(observable: Observable<T>, defaultValue: T): BehaviorSubject<T>;
export declare function useSyncObservable<T>(observable: Observable<T> | null | undefined): BehaviorSubject<T | null> | null;
export declare function useSyncObservable<T>(observable: BehaviorSubject<T> | null | undefined): BehaviorSubject<T> | null;
export declare function useSyncObservable<T>(observable: Observable<T> | null | undefined, defaultValue: T): BehaviorSubject<T> | null;
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