Why npm start is throwing events.js:187 throw er; // Unhandled 'error' event in my react project?

问题

While starting the server for the first time just after the code checkout , my react js project is throwing error "events.js:187 throw er; // Unhandled 'error' event" . I have node 12.13.0 and npm 6.12.0 . Log file attached log file

events.js:187
      throw er; // Unhandled 'error' event
      ^



    Error: spawn cmd ENOENT
        at Process.ChildProcess._handle.onexit 
       (internal/child_process.js:264:19)
       at onErrorNT (internal/child_process.js:456:16)
       at processTicksAndRejections (internal/process/task_queues.js:80:21)
    Emitted 'error' event on ChildProcess instance at:
       at Process.ChildProcess._handle.onexit (internal/child_process.js:270:12)
       at onErrorNT (internal/child_process.js:456:16)
       at processTicksAndRejections (internal/process/task_queues.js:80:21) {
    errno: 'ENOENT',
    code: 'ENOENT',
    syscall: 'spawn cmd',
    path: 'cmd',
    spawnargs: [ '/c', 'start', '""', '/b', 'http://localhost:3000/' ]
}

回答1:

If your system is windows, set your environment variable, add %SystemRoot%\system32 to your PATH I met this error yesterday，hope it works to you. Don't forget reboot you PC

回答2:

You can use node Your_File_Name.js command to run from the localhost. To use npm start command, you need to use scripts array in your package.json file "scripts": { "start": "http://localhost:3000/" } If this is not helpful can you attach more details?

回答3:

Try to execute export PATH=$PATH:/mnt/c/Windows/System32. Change the path /mnt/c/ to the path mounted on your wsl Windows (mount).

if it works, insert the path /mnt/c/Windows/System32 into the file /etc/environment.

here in my case this solution worked

回答4:

Make sure all the global & local packages that are being used in the scripts are installed, I've spent hours debugging an issue while deploying an application because webpack-cli & yarn wasn't installed globally & my project was trying to access it locally.

回答5:

Downgrading the react-script version from 3.0.1 to 2.1.8 worked for me. npm install react-scripts@2.1.8 npm install npm start

来源：https://stackoverflow.com/questions/58603936/why-npm-start-is-throwing-events-js187-throw-er-unhandled-error-event-in

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