code: function() {
        return {
          command: "migrate [options]",
          desc: "migrates a qooxdoo application to the next major version",
          usage: "migrate",
          builder: {
            "verbose": {
              alias : "v",
              describe: "enables additional progress output to console",
              type: "boolean"
            }
          },
          handler: function(argv) {
            return new qx.tool.cli.commands.Migrate(argv)
              .process()
              .catch(e => {
                console.error(e.stack || e.message);
                process.exit(1);
              });
          }
        };
      }
docs: Installs the command into yargs