1 files changed, 8 insertions, 4 deletions
diff --git a/assets/viz/2/goog/string/const.js b/assets/viz/2/goog/string/const.js
index 7f919be..30bfc4e 100644
--- a/assets/viz/2/goog/string/const.js
+++ b/assets/viz/2/goog/string/const.js
@@ -56,7 +56,7 @@ goog.string.Const = function() {
   /**
    * A type marker used to implement additional run-time type checking.
    * @see goog.string.Const#unwrap
-   * @const
+   * @const {!Object}
    * @private
    */
   this.STRING_CONST_TYPE_MARKER__GOOG_STRING_SECURITY_PRIVATE_ =
@@ -148,9 +148,6 @@ goog.string.Const.unwrap = function(stringConst) {
  *   var t = goog.string.Const.from('hello' + world);
  * </pre>
  *
- * TODO(xtof): Compile-time checks that this function is only called
- * with compile-time constant expressions.
- *
  * @param {string} s A constant string from which to create a Const.
  * @return {!goog.string.Const} A Const object initialized to stringConst.
  */
@@ -180,3 +177,10 @@ goog.string.Const.create__googStringSecurityPrivate_ = function(s) {
       s;
   return stringConst;
 };
+
+
+/**
+ * A Const instance wrapping the empty string.
+ * @const {!goog.string.Const}
+ */
+goog.string.Const.EMPTY = goog.string.Const.from('');