I am practicing with the type, and then encountered this kind of problem, I read some posts and still can’t figure it out why.
type A = (() => true) extends Record<string, any> ? true : false; // => true
type B = (() => true) extends Record<string, unknown> ? true : false; // false
The basic difference between any and unknown is the way we assign it into other variables. unknown is type-safe, so it is impossible when you assign a variable with unkown to other variables with a specific type.
I think you can read more about these two posts.