import { Observable, OperatorFunction } from 'rxjs';
/**
 * Turns the first incoming observable *hot* and ignores any further observable
 * until the first completes (or fails). Once that happens the operator is ready
 * to accept new observables.
 *
 * The *hot* observables are emitted, the others not.
 *
 * @typeParam T type of both the accepted and emitted observable
 * @category Operator
 */
export declare function concurrentOne<T>(): OperatorFunction<Observable<T>, Observable<T>>;
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