import { Observable } from "rxjs";
/**
 * Will wait for the first value of the given Observable
 * for mapping and emits the value of the Observable
 * returned by `mappingFn`.
 *
 * @param observable
 * @param mappingFn
 */
export default function mapToFirstValue<TObservableValue, TMappedObservableValue>(observable: Observable<TObservableValue>, mappingFn: (firstValue: TObservableValue) => Observable<TMappedObservableValue>): Observable<TMappedObservableValue>;