Ruby继续递归

Question

exports = module.exports = (paths, argv) => {

    const webpack = require('webpack');

    let plugins = [];

    //#region Define plugin

    // Shared environment configurations.
    let sharedEnvProperties = {
        PATHS: JSON.stringify(paths)
    };

    // Environment properties.
    let env = {};

    // In production mode.
    if (argv.production)
        env = Object.assign({}, require('../shared/env/production')(paths, argv), sharedEnvProperties);
    else
        env = Object.assign({}, require('../shared/env/development')(paths, argv), sharedEnvProperties);

    plugins.push(new webpack.DefinePlugin(env));

    //#endregion

    //#region Ignore plugin

    plugins.push(new webpack.IgnorePlugin(/vertx/));
    plugins.push(new webpack.IgnorePlugin(/bufferutil/));
    plugins.push(new webpack.IgnorePlugin(/spawn-sync/));
    plugins.push(new webpack.IgnorePlugin(/utf-8-validate/));

    //#endregion

    // Import node libs.
    const path = require('path');
    return {
        entry: {
            'main': path.resolve(paths.src, 'main.js')
        },
        target: 'electron-main',
        mode: argv.production ? 'production' : 'development',
        context: paths.root,
        devtool: !argv.production ? 'source-map' : false,
        optimization: {
            runtimeChunk: false,
            splitChunks: {
                chunks: 'all',
                cacheGroups: {
                    default: {
                        enforce: true,
                        priority: 1
                    },
                    vendors: {
                        test: /[\\/]node_modules[\\/]/,
                        priority: 2,
                        name: 'main-vendors',
                        enforce: true,
                        chunks: 'async'
                    }
                }
            }
        },
        module: {
            rules: [
                {
                    test: /\.tsx?$/,
                    loader: "babel-loader!ts-loader"
                },
                {
                    test: /\.js$/,
                    exclude: /(node_modules)/,
                    use: {
                        loader: 'babel-loader',
                        options: {
                            presets: [['env', {"modules": false}]]
                        }
                    }
                }
            ]

        },
        plugins: plugins,
        output: {
            filename: '[name].js'
        },
        resolve: {
            // Add `.ts` and `.tsx` as a resolvable extension.
            extensions: [".ts", ".tsx", ".js"]
        },
        watch: !argv.production,
        watchOptions: {
            poll: false
        },
        node: {
            __filename: true,
            __dirname: true
            // __dirname: false,
            // __filename: false
        },
        externals: {
            'node-notifier': 'commonjs node-notifier'
        }
    };
};

以上代码以这种形式输出-

$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
def run(s)
  begin
    if s.size == 6
      exit
    end
    $chars.each_char do |y|
      s = s + y
      puts s
      puts run(s)
    end
  end
end

run('A')

但是我希望它继续到下一个字符，例如-

AA
AAA
AAAA
AAAAA
AAAAAA

我能够使它与4个循环一起工作，但是我不能使用递归。 任何帮助和建议，我们感激不尽。谢谢！