errors: add ERR_AMBIGUOUS_MODULE_SYNTAX message

Author: Divya9877

lib/internal/errors.js

@@ -1133,6 +1133,11 @@ E('ERR_ACCESS_DENIED',
     return msg;
   },
   Error);
+
+  E('ERR_AMBIGUOUS_MODULE_SYNTAX',
+  'The module syntax is ambiguous. This file mixes CommonJS (require, module.exports) and ES Module features (import, export, or top-level await). Use either CommonJS or ES Modules consistently in the same file.',
+  Error);
+
 E('ERR_AMBIGUOUS_ARGUMENT', 'The "%s" argument is ambiguous. %s', TypeError);
 E('ERR_ARG_NOT_ITERABLE', '%s must be iterable', TypeError);
 E('ERR_ASSERTION', '%s', Error);