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node_modules/csso/lib/replace/Atrule.js

@@ -0,0 +1,9 @@
+var resolveKeyword = require('css-tree').keyword;
+var compressKeyframes = require('./atrule/keyframes');
+
+module.exports = function(node) {
+    // compress @keyframe selectors
+    if (resolveKeyword(node.name).basename === 'keyframes') {
+        compressKeyframes(node);
+    }
+};