Прочитай этот код, пойми что он делает. Предложи оптимизацию и рефакторинг. Предложи более информативный и сокращенный вывод. Напиши код целиком.

```
module.exports = function (grunt) {
    require('time-grunt')(grunt);

    // Pull defaults (including username and password) from .screeps.json
    var config = require('./.screeps.json');

    // Allow grunt options to override default configuration
    var branch = grunt.option('branch') || config.branch;
    var email = grunt.option('email') || config.email;
    var password = grunt.option('password') || config.password;
    var ptr = grunt.option('ptr') ? true : config.ptr;
    var private_directory = grunt.option('private_directory') || config.private_directory;
    var private_server_address = grunt.option('private_server_address') || config.private_server_address;
    var private_server_port = grunt.option('private_server_port') || config.private_server_port;
    var use_private_server = grunt.option('private_server_port') || config.private_server;

    var options = {
        email: email,
        password: password,
        branch: branch,
        ptr: ptr
    };

    if (use_private_server) {
        options.server =  {
            host: private_server_address,
            port: private_server_port,
            http: true
        };
    }

    var currentdate = new Date();
    grunt.log.subhead('Task Start: ' + currentdate.toLocaleString());
    grunt.log.writeln('Branch: ' + branch);

    // Load needed tasks
    grunt.loadNpmTasks('grunt-screeps');
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks("grunt-jsbeautifier");
    grunt.loadNpmTasks("grunt-rsync");

    grunt.initConfig({
        // 1. Remove all files from the dist folder.
        clean: {
            'dist': ['dist']
        },
        
        // 2. Copy all source files into the dist folder, flattening the folder
        // structure by converting path delimiters to underscores
        copy: {
            // Pushes the game code to the dist folder, so it can be modified before
            // being sent to the screeps server.
            screeps: {
                files: [{
                    expand: true,
                    cwd: 'src/',
                    src: '**',
                    dest: 'dist/',
                    filter: 'isFile',
                    rename: function (dest, src) {
                        // Change the path name utilize underscores for folders
                        return dest + src.replace(/\//g, '_');
                    }
                }],
            }
        },

        // Copy files to the folder the client uses to sync to the private server.
        // Use rsync so the client only uploads the changed files.
        rsync: {
            options: {
                args: ["--verbose", "--checksum"],
                exclude: [".git*"],
                recursive: true
            },
            private: {
                options: {
                    src: './dist/',
                    dest: private_directory,
                }
            },
        },

        // Apply code styling
        jsbeautifier: {
            modify: {
                src: ["src/**/*.js"],
                options: {
                    config: '.jsbeautifyrc'
                }
            },
            verify: {
                src: ["src/**/*.js"],
                options: {
                    mode: 'VERIFY_ONLY',
                    config: '.jsbeautifyrc'
                }
            }
        },

        // Push all files in the dist folder to screeps. What is in the dist folder
        // and gets sent will depend on the tasks used.
        // Iniiting screeps to lookup under dist folder
        screeps: {
            options: options,
            dist: {
                src: ['dist/*.js']
            }
        }
    });

    // Custom task to update version file
    grunt.registerTask('updateVersion', 'Update the version number in version.js', function () {
        var versionFilePath = './src/version.js';
        var currentVersion = 0;

        if (grunt.file.exists(versionFilePath)) {
            try {
                var content = grunt.file.read(versionFilePath);
                var context = {};
                new Function('global', 'module', content)(context);

                if (typeof context.SCRIPT_VERSION !== 'undefined') {
                    currentVersion = context.SCRIPT_VERSION;
                }
            } catch (e) {
                grunt.log.error('Error evaluating version.js:', e);
            }
        }

        var newVersion = currentVersion + 1;
        var versionContent = "global.SCRIPT_VERSION = " + newVersion + ";\n" +
                             "global.SCRIPT_VERSION_DATE = '" + currentdate.toLocaleString() + "';\n";

        grunt.file.write(versionFilePath, versionContent);
    });

    grunt.registerTask('updateRequires', 'Update require statements in built files', function () {
        grunt.file.expand({ cwd: 'dist/' }, '**/*.js').forEach(function (file) {
            var filepath = 'dist/' + file;
            var contents = grunt.file.read(filepath);
            contents = contents.replace(/require\(("|')((?:\.\.\/)*)([^'"]*)(?:\.js)?("|')\)/g, function (match, p1, p2, p3, p4) {
                if (/\.js$/.test(p3)) {
                    var dirname = p2.split('/').slice(0, -1).join('_');
                    var filename = p3.replace(/\.js$/, '');
                    return `require(${p1}${dirname}_${filename}${p4})`;
                } else {
                    var newpath = p3.replace(/\//g, '_').replace(/^\.\//, '');
                    return `require(${p1}${newpath}${p4})`;
                }
            });
            grunt.file.write(filepath, contents);
        });
    });

    // Combine tasks into a default task
    grunt.registerTask('default', ['clean', 'updateVersion', 'copy:screeps', 'updateRequires', 'screeps']);
    grunt.registerTask('private', ['clean', 'updateVersion', 'copy:screeps', 'rsync:private']);
    grunt.registerTask('lint', ['jsbeautifier:verify']);
    grunt.registerTask('beautify', ['jsbeautifier:modify']);
}
```