Invalid options object: options has an unknown property 'running' (webpack-cli v4.10.0)

[yvele]

Bug report

Actual Behavior

Using:

• webpack v5.90.3
• webpack-cli v4.10.0 ⚠️
• webpack-dev-server v5.0.2

I get the following error:

[webpack-cli] Invalid options object. Dev Server has been initialized using an
options object that does not match the API schema.
 - options has an unknown property 'running'. These properties are valid:
   object { allowedHosts?, bonjour?, client?, compress?, devMiddleware?, headers?,
   historyApiFallback?, host?, hot?, ipc?, liveReload?, onListening?, open?, port?, proxy?,
   server?, setupExitSignals?, setupMiddlewares?, static?, watchFiles?, webSocketServer? }

I'm not using running at all in my config.

Expected Behavior

It should work with webpack-cli v4.10.0 as the v5 migration documentation states that:

Minimum compatible webpack-cli version is 4.7.0 but we recommend using the latest version.

Note that I'm stuck with webpack-cli v4 because of webpack/webpack-cli#3559

How Do We Reproduce?

Basic repository repro: https://github.com/yvele/webpack-dev-server-repro

options has an unknown property '_assetEmittingPreviousFiles'.

Note that upgrading webpack-cli fixes the problem:

- "webpack-cli": "4.10.0"
+ "webpack-cli": "5.1.4"

Please paste the results of npx webpack-cli info here, and mention other relevant information

  System:
    OS: macOS 14.3.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 557.83 MB / 16.00 GB
  Binaries:
    Node: 20.11.0 - ~/.nvm/versions/node/v20.11.0/bin/node
    npm: 10.2.4 - ~/.nvm/versions/node/v20.11.0/bin/npm
  Browsers:
    Chrome: 122.0.6261.94
    Edge: 122.0.2365.63
    Firefox: 122.0.1
    Safari: 17.3.1
  Packages:
    babel-loader: ~9.1.3 => 9.1.3
    copy-webpack-plugin: ~12.0.2 => 12.0.2
    fork-ts-checker-webpack-plugin: ~9.0.2 => 9.0.2
    string-replace-loader: ~3.1.0 => 3.1.0
    style-loader: ~3.3.4 => 3.3.4
    terser-webpack-plugin: ~5.3.10 => 5.3.10
    webpack: ~5.90.3 => 5.90.3
    webpack-cli: ~4.10.0 => 4.10.0
    webpack-dev-server: ~5.0.2 => 5.0.2

[alexander-akait]

You can't use "webpack-cli": "4.10.0" with webpack-dev-server v5, it is a breaking change, just a typo, we need to fix migration guide