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node_modules/csso/lib/clean/Declaration.js

@@ -0,0 +1,14 @@
+var property = require('css-tree').property;
+
+module.exports = function cleanDeclartion(node, item, list) {
+    if (node.value.children && node.value.children.isEmpty()) {
+        list.remove(item);
+        return;
+    }
+
+    if (property(node.property).custom) {
+        if (/\S/.test(node.value.value)) {
+            node.value.value = node.value.value.trim();
+        }
+    }
+};