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Add port detection
Similar to: https://github.com/facebookincubator/create-react-app/blob/ef8687733160e8af7d2742b3d6e4b7cbcfc7e8c7/packages/react-scripts/scripts/start.js#L103
Currently we get a nasty exit code 1 with very little good feedback on why it failed to start.
Recreate:
- Open 2 terminal windows
- Run
yarn startin both windows