void（args）在javascript中做了什么？

Question

我很难重构代码，有人可以告诉我带参数的void的目的是什么：

 case "JAVASCRIPT":
  let name= keyObject.customer.name;
  let ref = keyObject.customer.ref;
  let id1 = keyObject.customer.id1;
  let id2 = keyObject.customer.id2;
  let secNr= keyObject.customer.secNr;
  let key = "";
  void(navn + ref + id1 + id2 + secNr + "kijn" + key); // <--- WTF IS THIS...

  if (selectedItem.key[0] !== "kunj") {
    key = keyObject.keys[0] + "" + keyObject.keys[1];
  }
  let pathArray = window.location.pathname.split("/");
  let returnUrl = pathArray.slice(3).toString().replace(new RegExp(",", "g"), "/");
  void(returnUrl); <-- and this
  eval(selectedItem.url);
  break;

这样重构是否安全：

case "JAVASCRIPT":
  eval(selectedItem.url);
  break;