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React Native, Failed to launch emulator. Reason: No emulators found as an output

I'm trying to run my react native app in emulator by using command react-native run-android but it's throwing that error
Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.3/userguide/command_line_interface.html#sec:command_line_warnings
BUILD SUCCESSFUL in 44s
info Connecting to the development server...
warn Failed to connect to development server using "adb reverse": spawnSync /Opt/Android/platform-tools/adb ENOENT
info Starting the app...
The system cannot find the path specified.
error Failed to start the app. Run CLI with --verbose flag for more details.
Error: Command failed: /Opt/Android/platform-tools/adb shell am start -n com.reactproject/com.reactproject.MainActivity
at makeError (C:\Users\Danger World\ReactProject\node_modules\execa\index.js:174:9)
I already setup my android studio and sdk manager, avd manager like it's shown in doc also I already set path but it's still showing that error, anyone know why? Can anyone help please?

You can fix it by using the command :
react-native doctor
This command shows all issues that need to be fixed.
Press f to fix the issues and don't forget to restart your windows
And after then open the emulator before running your project.
Once emulator opened,
run command:
react-native run-android
After fixed:
Don't forget to give me an upvote if that's work.

In My Case, I have to re-run the command in the same terminal where you are trying to run npx react-native run-android
Step 1. paste the source command first
source ~/.bash_profile OR source ~/.bashrc
Step 2. RUN Next command
npx react-native run-android

set your AVD manager path and JDK path like this , also you have to add Android Home path

Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

I am new to react-native development. I was trying a simple react-native project from Facebook git hub. I have followed all the steps but when I try to run the project by typing
react-native run-android
it simply shows me following error:
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 864 file(s) to forward-jetify. Using 4 workers...
info Starting JS server...
info Launching emulator...
info Successfully launched emulator.
info Installing the app...
Warning: No leading - on line 1 of `C:\Program Files\Java\jdk-13\lib\jvm.cfg'
error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with --verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081
Warning: No leading - on line 1 of `C:\Program Files\Java\jdk-13\lib\jvm.cfg'
at checkExecSyncError (child_process.js:611:11)
at execFileSync (child_process.js:629:15)
at runOnAllDevices (C:\Users\Toshiba\Documents\AwesomeProject\node_modules\#react-native-community\cli-platform-android\build\commands\runAndroid\runOnAllDevices.js:94:39)
at processTicksAndRejections (internal/process/task_queues.js:97:5)
at async Command.handleAction (C:\Users\Toshiba\Documents\AwesomeProject\node_modules\react-native\node_modules\#react-native-community\cli\build\index.js:164:9)

Turns out I had a problem with my Java. I uninstall JDK and JRE and reinstall the latest version and it worked out for me.

Try these once :
1.reopen android studio as admin. build the gradle. if no issue, proceed on
access the android folder of your app. i.e c:\folder\app\android
2.type in gradlew clean
3.run react-native run-android
Hope it helps

If you're using the latest version of Java Development Kit, you'll need to change the Gradle version of your project so it can recognize the JDK. You can do that by going to {project root folder}\android\gradle\wrapper\gradle-wrapper.properties and changing the distributionUrl value to upgrade the Gradle version. You can check out here the lastest releases of Gradle

React native can't run in ios by command but it can run in Xcode?

I used two libraries: "native-base" and "react-native-elements" but when I used it, I could not use the command react-native run-ios. But when I open the Xcode project, it can run and work as well.
This is my error below when I try to use the command react-native run-ios:
error Failed to build iOS project. We ran "xcodebuild" command but it exited with error code 65. To debug build logs further, consider building your app with Xcode.app, by opening DesignComponents.xcodeproj
One more error:
The following build commands failed:
Analyze /Users/my_path_project/node_modules/react-native/React/Base/RCTAssert.m normal x86_64
(1 failure)
I try to resolve it by clean cache, clean folder node_modules and something that I can, but it's not working.

React-Native cannot run project if I am not Sudo

I am unable to run react-native project with the code react-native run-android. I am getting the following error
info Starting JS server...
info Building and installing the app on the device (cd android && ./gradlew app:installDebug)...
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Could not create service of type AnnotationProcessorDetector using JavaGradleScopeServices.createAnnotationProcessorDetector().
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 1s
error Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/getting-started.html
error Command failed: ./gradlew app:installDebug. Run CLI with --verbose flag for more details.
But it runs if I run it as root `sudo react-native run-andoid'.
How can I make the project run without being root??

I found out from reading the post by Medium that u have to give permission to every folder explicitly when u encounter a permission issue when installing react native and realated tools, so that u can run the app without being sudo. Otherwise the files installed by sudo can only be run as sudo.
Use the below command to give access to the current user for that specific folder
sudo chown -R $(whoami) ~/Documents/Myapplicationfolder

vscode-ripgrep not getting installed in VSCode build/run process

I was trying to build and run VSCode on my Ubuntu 17.10 using the following guide: https://github.com/Microsoft/vscode/wiki/How-to-Contribute#build-and-run
When I tried to install dependencies using yarn, it is giving me the following error:
error /home/dhairyakhale/git/vscode/node_modules/vscode-ripgrep: Command failed.
Exit code: 1
Command: node ./lib/postinstall.js
Arguments:
Directory: /home/dhairyakhale/git/vscode/node_modules/vscode-ripgrep
Output:
Unzipping to /home/dhairyakhale/git/vscode/node_modules/vscode-ripgrep/bin
And then it stops the process. How do I proceed?

I have a similar issue while installing Theia. The broken vscode-ripgrep installation caused it. Here is the ticket I submitted to vscode-ripgrep.
https://github.com/roblourens/vscode-ripgrep/issues/15