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Select your app's JSContext: Develop в†’ Simulator в†’ JSContext.Enable Develop menu in Safari: Preferences в†’ Advanced в†’ Select 'Show Develop menu in menu bar'.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.Д¬ustom debugger commands executed this way should be short-lived processes, and they shouldn't produce more than 200 kilobytes of output. The debugger will receive a list of all project roots, separated by a space. You can then select 'Debug JS Remotely' from the Developer Menu to start debugging. 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. Debugging using a custom JavaScript debugger # Note: the React Developer Tools Chrome extension does not work with React Native, but you can use its standalone version instead. Root access is required for the use in real device. Please correct this by running adb shell 'date `date +%m%d%H%M%Y.%S%3N`' on your debugger machine. 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. You may also want to enable Pause On Caught Exceptions for a better debugging experience. You may also access the DevTools using keyboard shortcuts ( вЊвЊҐI on macOS, Ctrl Shift I on Windows). This will open a new tab at Select Tools в†’ Developer Tools from the Chrome Menu to open the Developer Tools.

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To debug the JavaScript code in Chrome, select 'Debug JS Remotely' from the Developer Menu. To dismiss these errors, fix the syntax error and either save to automatically dismiss (with Fast Refresh enabled) or cmd+r to reload (with Fast Refresh disabled). This error is not dismissable because it represents invalid JavaScript execution that must be fixed before continuing with your app.

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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. Unhandled JavaScript errors such as undefined is not a function will automatically open a full screen LogBox error with the source of the error. ignoreAllLogs ( ) Copy Unhandled Errors # ignoreLogs ( ) // Ignore all log notifications: LogBox. Import from 'react-native' // Ignore log notification by message: LogBox. Ignore logs as a last resort and create a task to fix any logs that are ignored. This is useful when there's a noisy warning that cannot be fixed, like those in a third-party dependency. Additionally, notifications can be hidden on a per-log basis via LogBox.ignoreLogs(). This is useful when giving product demos, for example. These notifications can be hidden using LogBox.ignoreAllLogs(). 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. Console Errors and Warnings #Д¬onsole 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 is automatically disabled in release (production) builds. LogBox #Д®rrors and warnings in development builds are displayed in LogBox inside your app. To enable them, open the Hardware menu, select Keyboard, and make sure that 'Connect Hardware Keyboard' is checked. React Native supports a few keyboard shortcuts in the iOS Simulator. 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 #ДЇast Refresh is a React Native feature that allows you to get near-instant feedback for changes in your React components. The Developer Menu is disabled in release (production) builds. Alternatively for Android, you can run the command adb shell input keyevent 82 to open the dev menu (82 being the Menu key code).

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You can also use the вЊD keyboard shortcut when your app is running in the iOS Simulator, or вЊM when running in an Android emulator on Mac OS and Ctrl+M on Windows and Linux. You can access the developer menu by shaking your device or by selecting 'Shake Gesture' inside the Hardware menu in the iOS Simulator. Debugging Accessing the In-App Developer Menu #

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