/** Prompts user to write the string.
 * @param message is the description of the prompt.
 * @param default_value [optional] if user didn't write in the prompt then this value is returned.
 * @return string or default value.
 * @throws an exception if user didn't wrote the input and no default value is given.
*/
export declare const promptString: (message: string, default_value: string | undefined) => Promise<string>;
/** Prompts user to choose an option from the given list of elements.
 * @param message is the description of the prompt.
 * @param options list of options that user can choose.
 * @param default_value [optional] if user didn't pick in the prompt, then this value is returned.
 * @return string or default value.
 * @throws an exception if user didn't wrote the input and no default value is given.
 */
export declare const promptStringOption: (message: string, options: string[], default_value: string | undefined) => Promise<string>;