We're gonna cover two things that are Aren't really related but kind of in the same headspace. The first one is What's called a const assertion in TypeScript? You might have seen it once or twice where at the end of a very variable declaration somebody tax on as const And then the second one is something that's new in I believe TypeScript 4.9 Which is what's called satisfies? And we'll talk about what specific use case you might want to use that In Typecript is kind of kind of cool.