Oh, wow! What a clever use of

xstate

here https://github.com/serverless-stack/serverless-stack/blob/c7b18fccbb00782d3beed0e6f002c5158f542b60/packages/core/src/cli/FunctionBuilder.ts#L1-L7. Great library which I've used myself

What is this for?

xstate is a great little state machine library