Release note 👇
github.com/gvergnaud/ts...

Love it! These sound effects are just perfect ❤️

And here is a TypeScript Playground with the full code snippet
👇

www.typescriptlang.org/play/#code/F...

I also have a full chapter about advance uses for Mapped Types in my TypeScript course, check it out: type-level-typescript.com/mapped-types

Mapped Types are a super powerful feature that you can learn about in TypeScript docs: www.typescriptlang.org/docs/handboo...

You need to understand how unions distribute over conditional types to fully get why `Extract` works. Its definition can be somewhat cryptic:

yea ultimately unions and catalogs encode the same information so either option works!

To extract a member of a discriminated union, I find that using the builtin Extract utility is the simplest, but I've noticed that the way Extract works isn't immediately intuitive to most people

I started using this pattern in one of my codebases a year ago and never looked back.

If you are also a heavy user of unions of objects, give it a try!

And lastly, it makes writing generic function types so much easier!

No need for pesky `Extract`s or `Exclude`s 🔥

Secondly, you can generate sub-unions super easily:

Firstly, having a catalog greatly decreases the number of type imports you need to make:

Thanks @ayc0.github.io! ❤️🙌