Annotate in the top-level with explicit types
@@ -21,7 +21,7 @@ goog.setTestOnly();
var asserts = goog.require('goog.testing.asserts');
var userAgent = goog.require('goog.userAgent');
-/** @const */
+/** @const {boolean} */
var IE8 = userAgent.IE && !userAgent.isVersionOrHigher(9);
