hotOnly option is not working

[nuong]

Bug report

What is the current behavior?
Cannot start webpack-dev-server if set hotOnly true
Error:

[webpack-cli] Invalid configuration object. Object has been initialized using a configuration object that does not match the API schema.
 - configuration has an unknown property 'hotOnly'. These properties are valid:
   object { bonjour?, client?, compress?, dev?, firewall?, headers?, historyApiFallback?, host?, hot?, http2?, https?, injectClient?, injectHot?, liveReload?, onAfterSetupMiddleware?, onBeforeSetupMiddleware?, onListening?, open?, openPage?, overlay?, port?, proxy?, public?, setupExitSignals?, static?, stdin?, transportMode?, useLocalIp? }
npm ERR! code ELIFECYCLE
npm ERR! errno 2

If the current behavior is a bug, please provide the steps to reproduce.
Use webpack 5: webpack@5.11.0 and webpack-dev-server@4.0.0-beta.0
Enable hotOnly option:

devServer: {
    hotOnly: true
},

What is the expected behavior?

Other relevant information:
webpack version: webpack@5.11.0
Node.js version: v14.15.1
Operating System: MacOS
Additional tools:

[webpack-bot]

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[alexander-akait]

Use hot: 'only', it is in CHANGELOG

[nolimitdev]

https://webpack.js.org/configuration/dev-server/#devserverhot

[DrThuraya]

Use hot: 'only', it is in CHANGELOG

Hi @alexander-akait ,

I upgrade node to 10.20 and npm to 6.14 and the ERROR message had changed!

when looking to fix this error, many persons recommend to change the "webpack.config.js" file, However, I didn't find this file in my directory https://github.com/DrThouraya/regards-frontend/tree/master/webapp.

Thanks for your help!
PS: I didn't found the last post so I write for you here..Thank you!

[alexander-akait]

Some developers use more complex webpack configuration names, in your case - webpack.*.*.js, you can found a lot of them here https://github.com/DrThouraya/regards-frontend/tree/master/webapp

From your error report - https://github.com/DrThouraya/regards-frontend/blob/master/webapp/webpack.dev.preprod.config.js config was used, but looks you have configuration for webpack dev server v3, I am afraid I can't help here, because maintenance of these packages should do migration, there are a lot of other options for v3, I recommend to open issue in https://github.com/RegardsOss/regards-frontend and ask developer about v4 migration

[DrThuraya]

Thanks a lot @alexander-akait. I texted to one of the developers!