When enabled, most of your edits should be visible within a second or two. Fast Refresh is enabled by default, and you can toggle "Enable Fast Refresh" in the React Native developer menu. While debugging, it can help to have Fast Refresh enabled. Enabling Fast Refresh #Fast Refresh is a React Native feature that allows you to get near-instant feedback for changes in your React components. Alternatively for Android, you can run the command adb shell input keyevent 82 to open the dev menu (82 being the Menu key code).The Developer Menu is disabled in release (production) builds.
Address Terminal Emulator Command Roots Full Screen InformationAdditionally, notifications can be hidden on a per-log basis via LogBox.ignoreLogs(). This is useful when giving product demos, for example. To view a console error or warnings, tap the notification to view the full screen information about the log and to paginate through all of the logs in the console.These notifications can be hidden using LogBox.ignoreAllLogs(). Console Errors and Warnings #Console errors and warnings are displayed as on-screen notifications with a red or yellow badge, and the number of errors or warning in the console respectively. LogBox #Errors and warnings in development builds are displayed in LogBox inside your app.LogBox is automatically disabled in release (production) builds. To enable them, open the Hardware menu, select Keyboard, and make sure that "Connect Hardware Keyboard" is checked.Syntax Errors #When syntax error occurs the full screen LogBox error will automatically open with the stack trace and location of the syntax error. These errors are dismissable and minimizable so that you can see the state of your app when these errors occur, but should always be addressed. IgnoreAllLogs ( ) Copy Unhandled Errors #Unhandled JavaScript errors such as undefined is not a function will automatically open a full screen LogBox error with the source of the error. IgnoreLogs ( ) // Ignore all log notifications: LogBox.Debugging using a custom JavaScript debugger #To use a custom JavaScript debugger in place of Chrome Developer Tools, set the REACT_DEBUGGER environment variable to a command that will start your custom debugger. Read this section to learn how. Root access is required for the use in real device.Note: the React Developer Tools Chrome extension does not work with React Native, but you can use its standalone version instead. Please correct this by running adb shell "date `date +%m%d%H%M%Y.%S%3N`" on your debugger machine. You may also want to enable Pause On Caught Exceptions for a better debugging experience.Note: on Android, if the times between the debugger and device have drifted things such as animation, event behavior, etc., might not work properly or the results may not be accurate.Enable Develop menu in Safari: Preferences → Advanced → Select "Show Develop menu in menu bar" Safari Developer Tools #You can use Safari to debug the iOS version of your app without having to enable "Debug JS Remotely". For example, if you set REACT_DEBUGGER="node /path/to/launchDebugger.js -port 2345 -type ReactNative", then the command node /path/to/launchDebugger.js -port 2345 -type ReactNative /path/to/reactNative/app will be used to start your debugger.Custom debugger commands executed this way should be short-lived processes, and they shouldn't produce more than 200 kilobytes of output. As soon as you select it, it will be available as $r in the Chrome console, letting you inspect its props, state, and instance properties.You can enable a performance overlay to help you debug performance problems by selecting "Perf Monitor" in the Developer Menu.Reactotron is an open-source desktop app that allows you to inspect Redux or MobX-State-Tree application state as well as view custom logs, run custom commands such as resetting state, store and restore state snapshots, and other helpful debugging features for React Native apps.You can view installation instructions in the README. There is a search box at the top that helps you find one by name. This step is essential.Then select a React component in React DevTools. Inspecting Component Instances #When debugging JavaScript in Chrome, you can inspect the props and state of the React components in the browser console.First, follow the instructions for debugging in Chrome to open the Chrome console.Make sure that the dropdown in the top left corner of the Chrome console says debuggerWorker.js. In this mode, clicking on something in the simulator will bring up the relevant components in the DevTools:You can choose "Toggle Inspector" in the same menu to exit this mode. Download lagu tarling indramayuDebugging on a device with Chrome Developer Tools #If you're using Create React Native App or Expo CLI, this is configured for you already.On iOS devices, open the file RCTWebSocketExecutor.mm and change "localhost" to the IP address of your computer, then select "Debug JS Remotely" from the Developer Menu.On Android 5.0+ devices connected via USB, you can use the adb command line tool to setup port forwarding from the device to your computer:Alternatively, select "Dev Settings" from the Developer Menu, then update the "Debug server host for device" setting to match the IP address of your computer.If you run into any issues, it may be possible that one of your Chrome extensions is interacting in unexpected ways with the debugger. In the iOS Simulator or by running adb logcat *:S ReactNative:V ReactNativeJS:V in a terminal while an Android app is running on a device or emulator.If you're using Create React Native App or Expo CLI, console logs already appear in the same terminal output as the bundler. Native DebuggingNpx react-native log-ios npx react-native log-android CopyYou may also access these through Debug → Open System Log. Debugging native code #When working with native code, such as when writing native modules, you can launch the app from Android Studio or Xcode and take advantage of the native debugging features (setting up breakpoints, etc.) as you would in case of building a standard native app.
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