code: function createFile() {
          let fileContent = '';
  
          /*
           * Customize data by type
           */
          switch (options.type) {
          case 'js':
              fileContent += `'use strict';` + '\n';
              for (let collectionKey in _variableCollection) {
                  fileContent += `const ${collectionKey} = '${_variableCollection[collectionKey]}';` + '\n';
              }
  
              if (_.endsWith(options.file, 'js') === false) options.file += '.js';
  
              break;
          default:
              /* json */
              fileContent = JSON.stringify(_variableCollection);
  
              if (_.endsWith(options.file, 'json') === false) options.file += '.json';
          }
  
          /*
           * Write file
           */
          return fs.writeFileSync(options.file, fileContent, 'utf8');
      }
docs: Create file.