code: function loadCredentials(file) {
          /**
           * Change it if you find a better way of synchronously 
           * check whether a file exists, or not !!!!!!
           */
          try {
              const stats = fs.statSync(file);
              // it existsSync
              return require(file)
          }
          catch(err) {
              // it does not existsSync
              return undefined
          } 
      }
docs: Utility auxiliary function -- loadCredentials