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I wrote DefinitelyTyped type definitions for a small library named vhtml. To get the type checks for JSX attributes and children to work properly, I had to mess with the JSX.IntrinsicElements interface, and its lesser-known cousin, JSX.LibraryManagedAttributes. It's nothing impressive in terms of complexity, but took a lot of fiddling to get it to work correctly. Mostly because TypeScript's JSX support is tailored for React and doesn't quite agree with Preact & other JSX inplementations.
I ported a lot of Purescript typeclasses and functions into Typescript: https://github.com/nadameu/adt-ts
We've got some fun definitions over in Redux Toolkit, particularly for createAction and createSlice. For that matter, createAsyncThunk has some bizarre typedefs to support a form of "optional generics"
Interesting. We use Redux in our project, and independently wrote something close to you guys, but using io-ts to provide runtime validation capabilities to our action creators, and our createReducer helper uses some TS blackmagic to prevent one from registering an action twice on the same reducer at compile-time! Good job there =)