环境

• node v12
• query-string 9.1.0

报错信息

Failed to compile../node_modules/query-string/base.js 350:14
Module parse failed: Unexpected token (350:14)
File was processed with these loaders:* ./node_modules/babel-loader/lib/index.js
You may need an additional loader to handle the result of these loaders.
|   }
|   return {
>     url: url_?.split('?')?.[0] ?? '',
|     query: parse(extract(url), options),
|     ...(options && options.parseFragmentIdentifier && hash ? {

解决方式

query-string 从 9.1.0 版本降级到 7.1.3 版本解决。

参考：MDN Web Docs 中 ?? 运算符对node版本的支持。