Props

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πŸ‘¨β€πŸ’Ό Our developers are having a hard time using the Calculator component properly, so I want you to add type annotations.
I'd also like you to meet Lily the Life Jacket! 🦺 She's going to be hanging around with the rest of the crew to indicate wherever there's something that's TypeScript-specific you need to do and to give you TypeScript-specific tips. You'll be working with Lily the Life Jacket a lot in this exercise.
Follow the emoji!