build(umd-module): prevent mangling (#4320)

* Prevent mangling of names in UMD distribution

This makes debugging easier in general.

* use `uglifyOptions`

make-webpack-config.js

@@ -52,6 +52,7 @@ module.exports = function(rules, options) {
     hot: false,
     separateStylesheets: true,
     minimize: false,
+    mangle: false,
     longTermCaching: false,
     sourcemaps: false,
   }, options._special)
@@ -69,6 +70,10 @@ module.exports = function(rules, options) {
 
     plugins.push(
       new UglifyJsPlugin({
+        uglifyOptions: {
+          mangle: specialOptions.mangle,
+          beautify: !specialOptions.mangle,
+        },
         sourceMap: true,
       }),
       new webpack.LoaderOptionsPlugin({

webpack-dist-bundle.config.js

@@ -20,6 +20,7 @@ module.exports = require("./make-webpack-config.js")(rules, {
   _special: {
     separateStylesheets: true,
     minimize: true,
+    mangle: true,
     sourcemaps: true,
   },
 

webpack-dist-standalone.config.js

@@ -20,6 +20,7 @@ module.exports = require("./make-webpack-config.js")(rules, {
   _special: {
     separateStylesheets: true,
     minimize: true,
+    mangle: true,
     sourcemaps: true,
   },