1 files changed, 44 insertions, 0 deletions
diff --git a/node_modules/cssnano-utils/src/sameParent.js b/node_modules/cssnano-utils/src/sameParent.js
new file mode 100644
index 00000000..6c484e1f
--- /dev/null
+++ b/node_modules/cssnano-utils/src/sameParent.js
@@ -0,0 +1,44 @@
+'use strict';
+
+/**
+ * @param {import('postcss').AnyNode} nodeA
+ * @param {import('postcss').AnyNode} nodeB
+ * @return {boolean}
+ */
+function checkMatch(nodeA, nodeB) {
+  if (nodeA.type === 'atrule' && nodeB.type === 'atrule') {
+    return (
+      nodeA.params === nodeB.params &&
+      nodeA.name.toLowerCase() === nodeB.name.toLowerCase()
+    );
+  }
+  return nodeA.type === nodeB.type;
+}
+
+/** @typedef {import('postcss').AnyNode & {parent?: Child}} Child */
+/**
+ * @param {Child} nodeA
+ * @param {Child} nodeB
+ * @return {boolean}
+ */
+function sameParent(nodeA, nodeB) {
+  if (!nodeA.parent) {
+    // A is orphaned, return if B is orphaned as well
+    return !nodeB.parent;
+  }
+
+  if (!nodeB.parent) {
+    // B is orphaned and A is not
+    return false;
+  }
+
+  // Check if parents match
+  if (!checkMatch(nodeA.parent, nodeB.parent)) {
+    return false;
+  }
+
+  // Check parents' parents
+  return sameParent(nodeA.parent, nodeB.parent);
+}
+
+module.exports = sameParent;