code: function commonjsMain (args) {
      var cwd = require("file").path(require("file").cwd());
      if (!args[1])
          throw new Error('Usage: '+args[0]+' FILE');
      var source = cwd.join(args[1]).read({charset: "utf-8"});
      exports.parser.parse(source);
  }
docs: default main method for generated commonjs modules