/// <reference types="node" />
import { URL } from 'node:url';
import { Arg, ArgDefinition } from './interfaces/parser';
/**
 * Create a custom arg.
 *
 * @example
 * type Id = string
 * type IdOpts = { startsWith: string; length: number };
 *
 * export const myArg = custom<Id, IdOpts>({
 *   parse: async (input, opts) => {
 *     if (input.startsWith(opts.startsWith) && input.length === opts.length) {
 *       return input
 *     }
 *
 *     throw new Error('Invalid id')
 *   },
 * })
 */
export declare function custom<T = string, P = Record<string, unknown>>(defaults: Partial<Arg<T, P>>): ArgDefinition<T, P>;
export declare const boolean: ArgDefinition<boolean, Record<string, unknown>>;
export declare const integer: ArgDefinition<number, {
    max?: number | undefined;
    min?: number | undefined;
}>;
export declare const directory: ArgDefinition<string, {
    exists?: boolean | undefined;
}>;
export declare const file: ArgDefinition<string, {
    exists?: boolean | undefined;
}>;
/**
 * Initializes a string as a URL. Throws an error
 * if the string is not a valid URL.
 */
export declare const url: ArgDefinition<URL, Record<string, unknown>>;
declare const stringArg: ArgDefinition<string, Record<string, unknown>>;
export { stringArg as string };