code: function (app, callback) {
      var options = {
        local: true,
        dir: configHelpers.getModulesPath(),
        prefix: ''
      };
      npm.load(options, function () {
        app = pathExtra.resolve(npmHelpers.initialWd, app);
        npm.commands.link([app], callback);
      });
    }
docs: Link given app source and dependencies from local file system.
  
  @param {String} app Path to the module to link.
  @param {Function} callback Callback to run once work is done.