Usage of "devServer.usePort"

[3makkk]

I can a little bit confusing to have the ability to define a port via "devServer.port" and prevent the usage of it via "devServer.usePort".

Possible solutions:

• "usePort" should throw an error if an port is defined
• if no "port" is defined it behaves like usePort right now.

[Sebastian-Fitzner]

Yeah, valid point ... I will fix that!