import { Observable } from '../../Observable';
import { distinctUntilKeyChanged, DistinctUntilKeyChangedSignature } from '../../operator/distinctUntilKeyChanged';

Observable.prototype.distinctUntilKeyChanged = distinctUntilKeyChanged;

declare module '../../Observable' {
  interface Observable<T> {
    distinctUntilKeyChanged: DistinctUntilKeyChangedSignature<T>;
  }
}