old_contents:   // environment variables
  exports.dev = true;
  exports.local = true;
  
  if (exports.local) {
    exports.host = 'localhost:3000';
  } else {
    exports.host = exports.dev === true ? 'dlx-dev.azurewebsites.net' : 'dlx.azurewebsites.net';
  }
  
  exports.map = function (name) {
    return exports.url + name;
  };
  
  exports.url = 'http://' + exports.host;
  
new_contents:   // environment variables
  exports.dev = true;
  exports.local = false;
  
  if (exports.local) {
    exports.host = 'localhost:3000';
  } else {
    exports.host = exports.dev === true ? 'dlx-dev.azurewebsites.net' : 'dlx.azurewebsites.net';
  }
  
  exports.map = function (name) {
    return exports.url + name;
  };
  
  exports.url = 'http://' + exports.host;
  
subject: change local variable