Description

Add --port to ng serve custom commands because angular does not support nodejs.process.env.PORT. Without --port the ng CLI will use its own default port and the emulator will eventually time out when it finds nothing on the expected port.

As a result we are also throwing an error if any custom command has specified --port or -p as this will result in the same issue above.

A caveat is that if it's not a custom start command and the emulator executes npm run dev, the dev script may have --port but we won't be able to detect this. This will result in the same error above.

Scenarios Tested

custom start command is ng serve
the default npm run dev command is used for a nextjs app