import { BehaviorSubject, Observable } from 'rxjs';
/**
 * Check whether the provided `Observable` is an instance of `BehaviorSubject`.
 *
 * @param observable observable to be checked
 * @typeParam T type of the observable value
 * @category Type Guard
 */
export declare function isBehaviorSubject<T>(observable: Observable<T>): observable is BehaviorSubject<T>;
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