export the port

What problem does this feature solve?

In most cases, the port is our user-defined port. But sometimes users will start multiple services. At this time vue-cli will use portfinder to start a new port, but the port is not exposed.

proxy: {
 target: `http://localhost:${port}/mock`,
}

Since the port has changed, the request cannot be proxy correctly.

What does the proposed API look like?

process.env.VUE_CLI.port Or any other way

[xsbchen]

On my macbook:

// vue.config.js
{
  devServer: {
    port: 80
  }
}

but after run vue-cli-service serve , it change to 1024.

set port in vue.config.js means I just want to set the port to what i want, but the result is not what i want.

[PanJiaChen]

portfinder is not very much needed in many scenarios, it is more reasonable to directly prompt it that the port is occupied.