is there some function to make the first letter uppercase of extract a letter from string

[summer sorrel]

type Greeting = "Hello, world"
type ShoutyGreeting = Uppercase<Greeting>

type ShoutyGreeting = "HELLO, WORLD"

but

type ShoutyGreeting = "Hello, World"

[crimson oxide]

https://stackoverflow.com/questions/70579220/typescript-how-to-create-a-type-which-can-convert-a-string-to-uppercase

I found this incredibly throrough answer that I hope helps you 🙂