Use jsUglify and have source maps!

.travis/matrix-installs.sh

@@ -20,6 +20,7 @@ else
 fi
 
 if [ "${BOWER:-no}" = "yes" ]; then
+    npm install -g uglify-js
     npm install -g bower
     bower install
 fi

corehq/apps/style/tests/test_compress_command.py

@@ -67,6 +67,7 @@ def _is_b3_base_template(self, template):
         return False
 
     def test_compress_offline(self):
+        call_command('collectstatic', verbosity=0, interactive=False)
         with patch('sys.stdout', new_callable=StringIO) as mock_stdout:
             call_command('compress', force=True)
 

corehq/apps/style/uglify.py

@@ -0,0 +1,99 @@
+import os
+import subprocess
+
+from compressor.exceptions import FilterError
+from compressor.filters import CompilerFilter
+from compressor.js import JsCompressor
+from compressor.utils.stringformat import FormattableString as fstr
+from django.conf import settings
+from django.utils.safestring import mark_safe
+
+
+# For use with node.js' uglifyjs minifier
+# Code taken from: https://roverdotcom.github.io/blog/2014/05/28/javascript-error-reporting-with-source-maps-in-django/
+class UglifySourcemapFilter(CompilerFilter):
+    command = (
+        "uglifyjs {infiles} -o {outfile} --source-map {mapfile}"
+        " --source-map-url {mapurl} --source-map-root {maproot} -c -m")
+
+    def input(self, **kwargs):
+        return self.content
+
+    def output(self, **kwargs):
+        options = dict(self.options)
+        options['outfile'] = kwargs['outfile']
+
+        infiles = []
+        for infile in kwargs['content_meta']:
+            # type, full_filename, relative_filename
+            infiles.append(infile[2])
+
+        options['infiles'] = ' '.join(f for f in infiles)
+
+        options['mapfile'] = kwargs['outfile'].replace('.js', '.map.js')
+
+        options['mapurl'] = '{}{}'.format(
+            settings.STATIC_URL, options['mapfile']
+        )
+
+        options['maproot'] = settings.STATIC_URL
+
+        self.cwd = kwargs['root_location']
+
+        try:
+            command = fstr(self.command).format(**options)
+
+            proc = subprocess.Popen(
+                command, shell=True, cwd=self.cwd, stdout=self.stdout,
+                stdin=self.stdin, stderr=self.stderr)
+            err = proc.communicate()
+        except (IOError, OSError), e:
+            raise FilterError('Unable to apply %s (%r): %s' %
+                              (self.__class__.__name__, self.command, e))
+        else:
+            # If the process doesn't return a 0 success code, throw an error
+            if proc.wait() != 0:
+                if not err:
+                    err = ('Unable to apply %s (%s)' %
+                           (self.__class__.__name__, self.command))
+                raise FilterError(err)
+            if self.verbose:
+                self.logger.debug(err)
+
+
+class JsUglifySourcemapCompressor(JsCompressor):
+
+    def output(self, mode='file', forced=False):
+        content = self.filter_input(forced)
+        if not content:
+            return ''
+
+        concatenated_content = '\n'.join(
+            c.encode(self.charset) for c in content)
+
+        if settings.COMPRESS_ENABLED or forced:
+            js_compress_dir = os.path.join(
+                settings.STATIC_ROOT, self.output_dir, self.output_prefix
+            )
+            if not os.path.exists(js_compress_dir):
+                os.makedirs(js_compress_dir, 0775)
+            filepath = self.get_filepath(concatenated_content, basename=None)
+
+            # UglifySourcemapFilter writes the file directly, as it needs to
+            # output the sourcemap as well
+            UglifySourcemapFilter(content).output(
+                outfile=filepath,
+                content_meta=self.split_content,
+                root_location=self.storage.base_location)
+
+            return self.output_file(mode, filepath)
+        else:
+            return concatenated_content
+
+    def output_file(self, mode, new_filepath):
+        """
+        The output method that saves the content to a file and renders
+        the appropriate template with the file's URL.
+        """
+        url = mark_safe(self.storage.url(new_filepath))
+        return self.render_output(mode, {"url": url})

package.json

@@ -6,8 +6,9 @@
   "dependencies": {
     "grunt": "^0.4.5",
     "grunt-cli": "^0.1.13",
-    "grunt-mocha": "^0.4.13",
     "grunt-contrib-watch": "^0.6.1",
-    "mocha": "^2.3.3"
+    "grunt-mocha": "^0.4.13",
+    "mocha": "^2.3.3",
+    "uglifyjs": "^2.4.10"
   }
 }

settings.py

@@ -1625,6 +1625,7 @@
 }
 
 COMPRESS_CSS_HASHING_METHOD = 'content'
+COMPRESS_JS_COMPRESSOR = 'corehq.apps.style.uglify.JsUglifySourcemapCompressor'
 
 
 if 'locmem' not in CACHES: