What does such an entry in TS mean?

Question

typescript

function identity<T>(arg: T): T {
  return arg;
}
let myIdentity: <U>(arg: U) => U = identity;

What does such a record mean, can we say that we check that the second function corresponds to the first?

Answer 1

No, nothing is checked here.
Simply the identity function is assigned to the variable myIdentity