Not getting "Unreachable code" error in: a = true; if (a) { throw; }; console.log(a);

What should happen: What does happen: (no error) I also tried adding as const, still no error:

[RyanCavanaugh]

Why are you writing code like this?

[RyanCavanaugh]

I see. Anyway, unreachability errors only occur for syntactically-unreachable positions. We don’t do reachability based on types because it prevents you from writing defensive code

function f(s: string) {
  if (typeof s !== "string") {
    throw new Error("Bad JS caller go away");
    // ^ "unreachable"
  }
  // etc
}