Compress Option

package.json

@@ -28,6 +28,12 @@
   "peerDependencies": {
     "enb": ">= 0.8.22"
   },
+  "dependencies": {
+    "browserify": "10.2.6",
+    "uglify-js": "2.4.24",
+    "vow": "0.4.10",
+    "vow-node": "0.3.0"
+  },
   "devDependencies": {
     "chai": "3.2.0",
     "chai-as-promised": "5.1.0",
@@ -46,10 +52,5 @@
     "unit": "mocha -R spec",
     "cover": "istanbul cover _mocha",
     "coveralls": "npm i coveralls && npm run cover -- --report lcovonly && cat ./coverage/lcov.info | coveralls"
-  },
-  "dependencies": {
-    "browserify": "10.2.6",
-    "vow": "0.4.10",
-    "vow-node": "0.3.0"
   }
 }

techs/browser-js.js

@@ -1,4 +1,5 @@
-var EOL = require('os').EOL;
+var minify = require('uglify-js').minify,
+    EOL = require('os').EOL;
 
 /**
  * @class BrowserJsTech
@@ -19,6 +20,7 @@ var EOL = require('os').EOL;
  *                                                                                 involved in the assembly.
  * @param {Boolean}   [options.iife=false]                                         Adds an option to wrap merged<br>
  *                                                                                 files to IIFE.
+ * @param {Boolean}   [options.compress=false]                                     Minifies and compresses JS code.
  *
  * @example
  * // Code in a file system before build:
@@ -56,6 +58,14 @@ module.exports = require('enb/lib/build-flow').create()
     .target('target', '?.browser.js')
     .useFileList(['vanilla.js', 'js', 'browser.js'])
     .defineOption('iife', false)
+    .defineOption('compress', false)
+    .wrapper(function (str) {
+        if (this._compress) {
+            return minify(str, { fromString: true }).code;
+        }
+
+        return str;
+    })
     .justJoinFiles(function (filename, contents) {
         var relPath = this.node.relativePath(filename);
 
@@ -66,10 +76,16 @@ module.exports = require('enb/lib/build-flow').create()
                 '}());'
             ].join(EOL);
         }
-        return [
-            '/* begin: ' + relPath + ' */',
-            contents,
-            '/* end: ' + relPath + ' *' + '/'
-        ].join(EOL);
+
+        // after compression comments will be removed
+        if (!this._compress) {
+            contents = [
+                '/* begin: ' + relPath + ' */',
+                contents,
+                '/* end: ' + relPath + ' *' + '/'
+            ].join(EOL);
+        }
+
+        return contents;
     })
     .createTech();

test/techs/browser-js.test.js

@@ -13,7 +13,7 @@ describe('browser-js', function () {
         mock.restore();
     });
 
-    describe('must join files with comments', function () {
+    describe('join files', function () {
         it('must join all files', function () {
             var blocks = {
                 'block0.vanilla.js': 'Hello0',
@@ -29,8 +29,23 @@ describe('browser-js', function () {
             ].join(EOL);
 
             return build(blocks)
-                .then(function (content) {
-                    content[0].should.be.equal(reference);
+                .spread(function (content) {
+                    content.should.be.equal(reference);
+                });
+        });
+    });
+
+    describe('compress', function () {
+        it('must compress files', function () {
+            var blocks = {
+                    'block0.vanilla.js': 'var b = function () {};',
+                    'block1.browser.js': 'if (foo) { bar(); }'
+                },
+                reference = 'var b=function(){};foo&&bar();';
+
+            return build(blocks, { compress: true })
+                .spread(function (content) {
+                    content.should.be.equal(reference);
                 });
         });
     });