Can't apply devClient to configuration.entry options when entry was a function

[HairyRabbit]

Hi, I use dynamic entry for my webpackConfig:

// webpack.config.js
module.exports = {
  entry: () => {
    return { app: 'index.js' }
  }
  //...
}

when I use webpack-dev-server start app, It's tell me configuration.entry does not match the schema:

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration.entry should be one of these:
   object { <key>: non-empty string | [non-empty string] } | non-empty string | [non-empty string] | function
   The entry point(s) of the compilation.
   Details:
    * configuration.entry should be an object.
    * configuration.entry should be a string.
    * configuration.entry[2] should be a string.
    * configuration.entry should be an instance of function
      function returning an entry object or a promise..

I think it maybe not works with the function type entry point. ./lib/util/addDevServerEntrypoints.js#L20

Anything help ❤️