Tell uglifyjs to not mangle undefined; saves 44 bytes. Fixes #13759. Close gh-1239.

diff --git a/Gruntfile.js b/Gruntfile.js
index e753a35cbdeca5142ab6ecbcafeb43f0eb18aaa9..1b13c277d9a250e418fe807dd140acb494b064e5 100644 (file)
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -115,6 +115,10 @@ module.exports = function( grunt ) {
                                        sourceMap: "dist/jquery.min.map",
                                        beautify: {
                                                ascii_only: true
+                                       },
+                                       mangle: {
+                                               // saves some bytes when gzipped
+                                               except: [ "undefined" ]
                                        }
                                }
                        }