How to enforce generic function parameter to accept only types that include undefined and null:

function foo<T>(val: T) { ... }

let fooNonNullOrUndefined: string = "foo"
foo(fooNonNullOrUndefined) // should not compile because string can neither be null nor undefined

let fooPossibleNull: string | null = "foo";
foo(fooPossibleNull) // should compile

let fooPossibleUndefined: string | undefined = "foo";
foo(fooPossibleUndefined) // should compile

let fooPossibleNullOrUndefined: string | null | undefined = "foo";
foo(fooPossibleNullOrUndefined) // should compile

Similar to Enforce generic type parameter to be nullish but also accepting/enforcing undefined.