'How to use Swift flags to detect a TestFlight build

I'm trying to branch my code depending on whether the app build is a debug, release, TestFlight, or App Store one. There are 4 different options for specifying Swift compiler flags:

Appstore Release
Debug
Enterprise Release
Release.

Which of these four options corresponds to TestFlight builds?

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'How to use Swift flags to detect a TestFlight build

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