TS extends keyword

extends means - it gets all from its parent


type Entry = "In" | "Out";
type InOrOut<T> = T extends `fade${infer R}` ? R : never;

// type I = "In"
type I = InOrOut<"fadeIn">;  
// type O = "Out"
type O = InOrOut<"fadeOut">;

What's the difference between 'extends' and 'implements' in TypeScript

I would like to know what Man and Child have in common and how they differ. class Person { name: string; age: number; } class Child extends Person {} class Man implements Person {}

https://stackoverflow.com/questions/38834625/whats-the-difference-between-extends-and-implements-in-typescript

TS extends keyword

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