first commit

build/node_modules/csso/lib/compressor/restructure/2-mergeAtrule.js

@@ -0,0 +1,35 @@
+var walkRulesRight = require('../../utils/walk.js').rulesRight;
+
+function isMediaRule(node) {
+    return node.type === 'Atrule' && node.name === 'media';
+}
+
+function processAtrule(node, item, list) {
+    if (!isMediaRule(node)) {
+        return;
+    }
+
+    var prev = item.prev && item.prev.data;
+
+    if (!prev || !isMediaRule(prev)) {
+        return;
+    }
+
+    // merge @media with same query
+    if (node.expression.id === prev.expression.id) {
+        prev.block.rules.appendList(node.block.rules);
+        prev.info = {
+            primary: prev.info,
+            merged: node.info
+        };
+        list.remove(item);
+    }
+};
+
+module.exports = function rejoinAtrule(ast) {
+    walkRulesRight(ast, function(node, item, list) {
+        if (node.type === 'Atrule') {
+            processAtrule(node, item, list);
+        }
+    });
+};