return, break, continue, or throw statements should be followed by a } or case or default.

The following code snippet illustrates this rule :

function sayHello() {
  if (true) {
    return;
    var b; // NOK - this will never be executed
  } else {
    var c;
  }

  while (true) {
    break;
    var d; // NOK - this will never be executed
  }
}