export default class Argument {
    /** argument name */
    name: string;
    /** this argument is required */
    required: boolean;
    /** this argument is variadic */
    variadic: boolean;
    /**
     * class of argument.
     * ```
     * cmd --path foo/bar buzz.txt
     *                     ↑ this one!
     * ```
     * @param arg pass '<foo>'(required) or '[foo]'(optional) or '<foo...>'(required & variadic) or '[foo...]'(optional & variadic)
     * @class
     */
    constructor(arg: string);
    /**
     * parse args.
     * build to opts.
     *
     * e.g. #1
     *   instance member:  name=foo, required=true, variadic=false
     *   method arguments: opts={}, args=["foo!", "bar!"].
     *   opts are modified to { foo: "foo!" } and return ["bar!"].
     *
     * e.g. #2
     *   instance member:  name=foo, required=false, variadic=true
     *   method arguments: opts={}, args=["foo!", "bar!"].
     *   opts are modified to { foo: ["foo!", "bar!"] } and return [].
     *
     * @param opts build target object
     * @param args
     * @returns {string[]} rest args
     */
    parse(opts: any, args: string[]): string[];
}