Looks like @ionic/app-scripts isn't installed in this project.

百度之後參考以下鏈接 https://blog.csdn.net/liweibo348/article/details/83625221 本地刪除node_modules文件夾，然後npm install 報錯：Failed at the [email protected] postinstall script.   不管它，繼續ionic serve，報錯  之後執行：npm install @

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