let _getError = () => new Error(`Usage: node ${process.argv[1]} [path to folder] [unwanted name part]`);

/**
 * @type {String}
 *
 *  Pass the folder path or return the current folder path.
 */
let folderPath;

/**
 * @type {String}
 *
 *  Pass the unwanted name of the folder you want to rename. If invalid will throw an error.
 */
let unwantedFolderName;

if (3 >= process.argv.length <= 4) {
    if (process.argv.length === 3) {
        folderPath = '.';
        unwantedFolderName = process.argv[2];
    } else {
        folderPath = process.argv[2];
        unwantedFolderName = process.argv[3];
    }
} else {
    throw _getError();
}

const fs = require('fs');

/**
 *
 * @param path
 *
 *  Return a array of folder(s) name(s).
 */
const dirs = path => fs.readdirSync(path).filter(file => fs.statSync(path + "/" + file).isDirectory());

let foldersNames = dirs(folderPath);

if(!unwantedFolderName) {
    throw _getError();
}

foldersNames.forEach((item) => {
    let oldFolder = folderPath + item
        , newFolder = folderPath + item.replace(unwantedFolderName, '');
    fs.rename(oldFolder, newFolder, (err) => {
        if (err) throw err;
        console.log(`Rename completed: "${oldFolder}" to "${newFolder}";`);
    });
});