v4.0.0-beta.0: Error: No dependency factory available for this dependency type: EntryDependency

[Semigradsky]

• Operating System: Ubuntu
• Node Version: v14.15.0
• NPM Version: 6.14.8
• webpack Version: 5.9.0
• webpack-dev-server Version: v4.0.0-beta.0

• This is a bug
• This is a modification request

Code

// webpack.config.js
  entry: {},

Expected Behavior

No error

Actual Behavior

Error:

<e> [webpack-dev-middleware] Error: No dependency factory available for this dependency type: EntryDependency
<e>     at Compilation.addModuleChain (.../node_modules/webpack/lib/Compilation.js:1632:5)
<e>     at Compilation._addEntryItem (.../node_modules/webpack/lib/Compilation.js:1742:8)
<e>     at Compilation.addEntry (.../node_modules/webpack/lib/Compilation.js:1673:8)
<e>     at .../node_modules/webpack-dev-server/lib/utils/DevServerPlugin.js:163:29
<e>     at new Promise (<anonymous>)
<e>     at .../node_modules/webpack-dev-server/lib/utils/DevServerPlugin.js:162:15
<e>     at Array.map (<anonymous>)
<e>     at .../node_modules/webpack-dev-server/lib/utils/DevServerPlugin.js:160:29
<e>     at Hook.eval [as callAsync] (eval at create (.../node_modules/webpack/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:38:17)
<e>     at Hook.CALL_ASYNC_DELEGATE [as _callAsync] (.../node_modules/webpack/node_modules/tapable/lib/Hook.js:18:14)

For Bugs; How can we reproduce the behavior?

I have only entrypoints generated by plugins (ModuleFederationPlugin) and I get this error when I set empty object {} to entry.

As a workaround I can set path to empty js file. In this case, I get no error.

[alexander-akait]

Please use the issue template, otherwise it will be closed

[Semigradsky]

Reproducible example: https://github.com/Semigradsky/webpack-dev-server-2876

yarn build works
yarn start returns error