code: function invokeInstall() {
      async.map(directories,
          function (elem, callback) {
              console.log('Current element', elem);
              removeAndInstall(elem, callback);
          },
          function (err, result) {
              if (err) {
                  console.error('Something went wrong! node_modules might now be trashed, sorry.', err);
                  process.exit(1);
              } else {
                  const ellapsed = new Date().getTime() - start;
                  console.log(`Install look good! took ${ellapsed}ms`);
                  process.exit(0);
              }
          }
      );
  }
docs: Set via command line