google closure compiler, type in IIFE

gistfile1.js

/**
 * @typedef {Object}
 */
var vendor = Vendor = {};

///**
// * @constructor 
// */
//Vendor.VendorType = function() {};

(function(vendor) {
  /**
   * @constructor
   */
  function VendorType() { this.a = "a"; };
 
  vendor.VendorType = VendorType;

  /**
   * @return {VendorType} the vendor type
   */
  function createIt() {
    return new vendor.VendorType();
  }
})(vendor);

/**
 * @return {Vendor.VendorType} a constructor-defined type
 */
function createTheThing() {
  return new Vendor.VendorType();
}

console.log(createTheThing());


==========================


java -jar lib/compiler.jar --jscomp_error checkTypes --compilation_level SIMPLE_OPTIMIZATIONS  type.js 
type.js:28: ERROR - Bad type annotation. Unknown type Vendor.VendorType
 * @return {Vendor.VendorType} a constructor-defined type
            ^

1 error(s), 0 warning(s)