[matt_kantor]

> it's just a set of all possible types

`unknown` is the set of all possible types (it's the top type[0]). `any` goes beyond that—it basically turns off the type checker[1][2].

[0]: https://en.wikipedia.org/wiki/Top_type

[1]: https://tsplay.dev/mA9vXm

[2]: https://www.typescriptlang.org/docs/handbook/2/everyday-type...

[undebuggable]

It's a "null" and "undefined" discussion all over, but now with transpiler.

[epolanski]

Your 1 isn't equivalent to my example, line 11 is not constraining the type.

[matt_kantor]

I know it's not equivalent, it was just an example to show what `any` does (and that it's more than "just a set of all possible types").

The `T extends Record<any, any>` on line 11 is a type parameter constraint though. Are you referring to something else when you say "constraining the type"?

[epolanski]

It works differently based on where those anys are and what that Record<any, any> refers to due to type variance.