Generic function type guard

Question

Is there a way to check whether got a function or value here ?

function f<T>(valueOrFunction : T | (()=>T)) {
  if(typeof valueOrFunction === "function" ) {
   //  Got a function
  } else {
   // Still 'T | (()=>T)'
   // Wanted: to get 'T'.
  }
}

Answer 1

Everything works as intended. It was 'Resharper' which thinks the code is incorrect.