1、我的項目問題原因：我的node的版本影響了node-sass的應用。
2、解決辦法：卸載當前版本，安裝最新版本的node-sass
yarn remove node-sass
yarn add node-sass --save-dev
刪除node_modules依賴，重新安裝依賴
yarn install
Error: PostCSS received undefined instead of CSS string
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