import { Observable } from 'rxjs';
export declare type ToBeFailed<T> = (actual?: Observable<T>) => boolean;
declare global {
    namespace jasmine {
        interface Matchers<T> {
            toBeFailed: T extends Observable<infer U> ? ToBeFailed<U> : never;
        }
    }
    namespace jest {
        interface Matchers<R> {
            toBeFailed: R extends Observable<infer U> ? ToBeFailed<U> : never;
        }
    }
}
export declare const toBeFailed: ToBeFailed<unknown>;