create-react-app 安装，但无法通过“start”运行

Question

On Windows 10 with NodeJS portable version 12.4.0 (I'm on a corporate computer and don't have access to install NodeJS).

When I run npx create-react-app myApp , it runs fine with no errors. I should mention I have an existing app (created months ago) which still runs fine on the same machine, but uses an older version of react-scripts.

When I run npm run start , i'm presented with this error:

events.js:177
      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:84:9)
Emitted 'error' event 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:84:9) {
  errno: 'ENOENT',
  code: 'ENOENT',
  syscall: 'spawn cmd',
  path: 'cmd',
  spawnargs: [ '/c', 'start', '""', '/b', 'http://localhost:3000/' ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! req@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the req@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.```

Answer 1

It seems to be a problem with your environment variables when using react-scripts@3.1.8 See: https://github.com/facebook/create-react-app/issues/6985

Just downgrade you react-scripts' version and it should work:

create-react-app my-app
cd my-app
npm install react-scripts@2.1.8
npm start

Answer 2

I would recommend handling that error. If you need something more specific than that, it seems like we would need to see the code.

You can also use a process manager such as PM2 to automatically restart your bot whenever it crashes.