[backend] fix: 修复异常处理和类型转换问题

frontend/node_modules/css-tree/cjs/syntax/pseudo/index.cjs

@@ -0,0 +1,54 @@
+'use strict';
+
+const selectorList = {
+    parse() {
+        return this.createSingleNodeList(
+            this.SelectorList()
+        );
+    }
+};
+
+const selector = {
+    parse() {
+        return this.createSingleNodeList(
+            this.Selector()
+        );
+    }
+};
+
+const identList = {
+    parse() {
+        return this.createSingleNodeList(
+            this.Identifier()
+        );
+    }
+};
+
+const nth = {
+    parse() {
+        return this.createSingleNodeList(
+            this.Nth()
+        );
+    }
+};
+
+const pseudo = {
+    'dir': identList,
+    'has': selectorList,
+    'lang': identList,
+    'matches': selectorList,
+    'is': selectorList,
+    '-moz-any': selectorList,
+    '-webkit-any': selectorList,
+    'where': selectorList,
+    'not': selectorList,
+    'nth-child': nth,
+    'nth-last-child': nth,
+    'nth-last-of-type': nth,
+    'nth-of-type': nth,
+    'slotted': selector,
+    'host': selector,
+    'host-context': selector
+};
+
+module.exports = pseudo;