Dive Deep React Native Debugging

runServer.js

// file location
// node_module/react-native/local-cli/server/runServer.js
function runServer(args, config, readyCallback) {
  var wsProxy = null;
  const packagerServer = getPackagerServer(args, config);
  const app = connect()
    .use(loadRawBodyMiddleware)
    .use(connect.compress())
    .use(getDevToolsMiddleware(args, () => wsProxy && wsProxy.isChromeConnected()))
    .use(openStackFrameInEditorMiddleware)
    .use(statusPageMiddleware)
    .use(systraceProfileMiddleware)
    .use(cpuProfilerMiddleware)
    .use(packagerServer.processRequest.bind(packagerServer));

  args.projectRoots.forEach(root => app.use(connect.static(root)));

  app.use(connect.logger())
    .use(connect.errorHandler());

  const serverInstance = http.createServer(app).listen(
    args.port,
    args.host,
    function() {
      attachHMRServer({
        httpServer: serverInstance,
        path: '/hot',
        packagerServer,
      });

      wsProxy = webSocketProxy.attachToServer(serverInstance, '/debugger-proxy');
      webSocketProxy.attachToServer(serverInstance, '/devtools');
      readyCallback();
    }
  );
  // Disable any kind of automatic timeout behavior for incoming
  // requests in case it takes the packager more than the default
  // timeout of 120 seconds to respond to a request.
  serverInstance.timeout = 0;
}