[wrs]

The FizzBuzz story did go down a rabbit hole, but this sort of TS type extravagance in small doses can help with maintainability. E.g., I wanted to enforce that the keys in a config object couldn’t have consecutive uppercase letters, because they would be automatically translated to camel case when looked up as environment variables (so awsAPIKey would become AWS_A_P_I_KEY, ugh). No need for a lint rule or whatever, you can do that with TS types in a few lines!