score:63 Show Accepted answer Yarn is a tool created by facebook as an efficient alternative for npm. In your case.. it is just informing that Yarn is not installed in your system. It is not the culprit. The problem lies in Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object Could not install the app on the device line. It looks like an error with the Java installation. Solution: Go to C:\Windows\System32 directory and delete java.exe (or rename it to something like java.exe.old) refer this answer for more details https://stackoverflow.com/a/30577609/5597641. btw you can install Yarn by typing npm install -g yarn in your command prompt. score:1 you need to set your environment variable -go to your yarn folder then bin -copy that path -save it in your environment variable as yarn score:2 Try npx yarn start. This worked for me. score:2 if you typed npm install -g yarn and getting still the same error then update your node and npm to latest stable version, whenever you install node to latest version npm also updated so one way to solve this problem is installing node from its official website score:3 If you are facing this error yarn: The term
'yarn' is not recognized as the name of a cmdlet, function, script file, or operable program. then Just run this command and Check yarn version in your systems yarn -vAfter this installation, you are showing above error then go to this page yarn install by manual score:7 Computer > Properties > Advanced System Setting > Environment Variables > Path edit add ; code C:\Program Files (x86)\Yarn\bin\; OR C:\Users\Username\AppData\Local\Yarn\bin\; score:7 install node here and then run npm install -g yarn command in terminal score:8 Step 1: Run the below command npm install -g yarnStep 2: Check that Yarn is installed by running: yarn --versionStep 3: If the above version command is not running then go to your C:\Users\<username>\AppData\Roaming\npmand delete yarn.ps1 if it is there. Done!!! score:12 You should probably insert your Yarn folder in your Environment Variables. If you already performed the command npm install -g yarnand still can't use yarn via terminal, check the following folder: C:\Users\[your user]\AppData\Roaming\npm If there`s a yarn file there, just put that directory in your Path variable. score:20 you have to install yarn globally in your windows OS type this in CMD npm install -g yarnyou can check yarn version by typing yarn --version on CMD score:187 I faced the same issue and it got resolved by below command npm install -g yarnRelated Query
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How do I enable yarn in Windows?How to Install Yarn on Windows. Install Yarn on Windows via MSI Installer.. Install Yarn on Windows via Chocolatey Package Manager.. Install Yarn on Windows via Scoop CLI.. Install Yarn on Windows via NPM.. How do I fix command not found on yarn?To solve the error "yarn: command not found", install the yarn package globally by running npm install -g yarn and restart your terminal. If the command fails, run it with sudo and make sure the correct PATH is set in your system's environment variable.
How do I use yarn instead of npm?Yarn can consume the same package. json format as npm, and can install any package from the npm registry.
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CLI commands comparison.. How do you run a command in yarn?yarn run [script] [<args>]
json . You can pass additional arguments to your script by passing them after the script name. Running this command will execute jest -o --watch . [script] can also be any locally installed executable that is inside node_modules/.
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Yarn is not recognized as an internal or external command, operable program or batch file.
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