1、我的项目问题原因：我的node的版本影响了node-sass的应用。
2、解决办法：卸载当前版本，安装最新版本的node-sass
yarn remove node-sass
yarn add node-sass --save-dev
删除node_modules依赖，重新安装依赖
yarn install
Error: PostCSS received undefined instead of CSS string
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