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[WIP] Use a different port if 3000 is used

Closed Administrator requested to merge github/fork/sotojuan/port into master

Created by: sotojuan

Work in progress!

Fixes #85 (closed).

The idea is to detect if port 3000 is used by something else and if so, use a different port.

portfinder takes in a basePort and returns that if it's available. If not, it'll use the next available port. This was a good solution because we can use 3000 as the basePort.

The problem is that while I can pass the port to the function that opens the browser, I can't pass it to the function that logs The app is running at http://localhost:3000/.

Assuming this UX is fine (@gaearon wanted a prompt, but I feel like this is less intrusive), how can I let the logging functions know about the new port?

Thanks!