/**
 * Promise handler to show an error and reject the promise.
 *
 * @param reason the promise rejection error
 * @returns a rejected promise
 */
export declare function showError<T>(reason: T): Promise<T>;
/**
 * Promise handler to show an error and resolve the promise with a recover
 * value.
 *
 * @param reason the promise rejection error
 * @param recoverWith the recover value
 * @returns a resolved promise
 */
export declare function showErrorAndRecover<T, R>(reason: T, recoverWith: R): Promise<R>;