Vue-cli: vue.config.js devServer before() arguments undefined

[chasegiunta]

Version

3.0.0-rc.3

Reproduction link

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

Steps to reproduce

Add:

devServer: {
  before(app, server) {
      server.sockWrite(server.sockets, "content-changed");
  }
}

to vue.config.js file.

What is expected?

sockWrite method on server is hit successfully

What is actually happening?

server is undefined

[LinusBorg]

The webpack docs that you linked to don't indicate that there is a second argument, what makes you think it should be there?

[LinusBorg]

Okay so I did some digging, it seems that the devserver indeed passes itself as the second argument, but that's undocumented:

https://github.com/webpack/webpack-dev-server/blob/master/lib/Server.js#L339

We can fix it here:

https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli-service/lib/commands/serve.js#L135-L147

[LinusBorg]

labelled as an enhancement since this devserver api is undocumented and therefore not a bug imho.