Minify client JS as part of the build conditionally (not for dev) and reference only minified JS libraries

src/Umbraco.Web.UI.Client/gulp/tasks/js.js

@@ -3,6 +3,8 @@
 var config = require('../config');
 var gulp = require('gulp');
 
+var minify = require('gulp-minify');
+var rename = require('gulp-rename');
 var _ = require('lodash');
 var MergeStream = require('merge-stream');
 
@@ -17,6 +19,19 @@ function js() {
     var stream = new MergeStream();
 
     var task = gulp.src(config.sources.globs.js);
+    if (config.compile.current.minify === true) {
+      task = task.pipe(
+        minify({
+          noSource: true,
+          ext: { min: '.min.js' },
+          mangle: false
+        })
+      );
+    } else {
+      task = task.pipe(rename(function(path) {
+        path.basename += '.min';
+      }));
+    }
     _.forEach(config.roots, function(root){
         task = task.pipe( gulp.dest(root + config.targets.js) )
     })