import { Result } from '@bubblewrap/core';
/**
 * A function that takes a `string`, validates and tries to convert to the type `T`, and returns a
 * {@link Result}. If the conversion is successful, the result is `Ok` and unwrapping returns `T`.
 * Otherwise, the result is `Error` and `unwrapError()` returns the underlying error.
 * @param {string} input the value to be validated and converted.
 * @returns {Result<T, Error>} an `Ok` {@link Result} that unwraps `T` if the validation and
 * conversion are successful or an `Error` if it fails.
 */
export declare type ValidateFunction<T> = (input: string) => Promise<Result<T, Error>>;
/**
 * A an interface that promps for different types of user input.
 */
export interface Prompt {
    /**
     * Prints a message to the user.
     * @param message the message to be printed.
     */
    printMessage(message: string): Promise<void>;
    /**
     * Prompts for text input.
     * @param {string} message a short description of the input.
     * @param {string | null} defaultValue a default value or null.
     * @param {ValidateFunction<T>} validateFunction a function to validate the input.
     * @returns {Promise<T>} a {@link Promise} that resolves to the validated user input, converted
     * to `T` by the `validateFunction`.
     */
    promptInput<T>(message: string, defaultValue: string | null, validateFunction: ValidateFunction<T>): Promise<T>;
    /**
     * Displays a list of options to the user and prompts the user to choose one of them.
     * @param {string} message a short description of the input.
     * @param {string[]} choices a list of choices to be displayed to the user.
     * @param {string | null} defaultValue a default value or null.
     * @param {ValidateFunction<T>} validateFunction a function to validate the input.
     * @returns {Promise<T>} a {@link Promise} that resolves to the validated user input, converted
     * to `T` by the `validateFunction`.
     */
    promptChoice<T>(message: string, choices: string[], defaultValue: string | null, validateFunction: ValidateFunction<T>): Promise<T>;
    /**
     * Prompts the user for a password. The text typed by the user is hidden and replaced by the `*`
     * character.
     * @param {string} message a short description of the input.
     * @param {ValidateFunction<string>} validateFunction a function to validate the input.
     * @returns {Promise<string>} a {@link Promise} that resolves to the user input validated by
     * `validateFunction`.
     */
    promptPassword(message: string, validateFunction?: ValidateFunction<string>): Promise<string>;
    /**
     * Prompts a Yes/No dialog. Returns `true` for yes and `false` for no.
     * @param {string} message a short description of the input.
     * @param {boolean} defaultValue a default value.
     * @returns {Promise<boolean>} a {@link Promise} that resolves to a {@link boolean} value. The
     * value will the `true` if the user answers `Yes` and `false` for `No`.
     */
    promptConfirm(message: string, defaultValue: boolean): Promise<boolean>;
}
/**
 * A {@link Prompt} implementation powered by inquirer.js (https://www.npmjs.com/package/inquirer)
 */
export declare class InquirerPrompt implements Prompt {
    printMessage(message: string): Promise<void>;
    promptInput<T>(message: string, defaultValue: string | null, validateFunction: ValidateFunction<T>): Promise<T>;
    promptChoice<T>(message: string, choices: string[], defaultValue: string | null, validateFunction: ValidateFunction<T>): Promise<T>;
    promptConfirm(message: string, defaultValue: boolean): Promise<boolean>;
    promptPassword(message: string, validateFunction: ValidateFunction<string>): Promise<string>;
}