Unexpected incorrect answer at Easy2's showAll

[sisisin]

Expected behavior: it should be correct when assign string to arr
Actual behavior: incorrect answer...

function showAll(arr: ?): void {
  for (const val of arr) {
    console.log(val);
  }
}

[uhyo]

Thank you! The cause was that target was set to es3 through compiler options.
Fixed by setting it to esnext.