[backend] fix: 修复异常处理和类型转换问题

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

@@ -0,0 +1,14 @@
+'use strict';
+
+const create = require('./create.cjs');
+const lexer = require('./config/lexer.cjs');
+const parser = require('./config/parser.cjs');
+const walker = require('./config/walker.cjs');
+
+const syntax = create({
+    ...lexer,
+    ...parser,
+    ...walker
+});
+
+module.exports = syntax;