D:\ionic_demo\demo4> npm uninstall -D @ionic/cli-plugin-ionic-angular
npm WARN @ionic-native/app-version@4.14.0 requires a peer of @ionic-native/core@^4.11.0 but none is installed. You must install peer dependencies yourself.
npm WARN @ionic-native/camera@4.14.0 requires a peer of @ionic-native/core@^4.11.0 but none is installed. You must install peer dependencies yourself.
npm WARN @ionic-native/clipboard@4.14.0 requires a peer of @ionic-native/core@^4.11.0 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
原因:fsevents不在package.json里，但是仍然安装了，是因为你的系统不是Windows系统，fsevents是苹果系统的可选依赖,你的项目有可能是团队项目，别人在他的mac上安装了fsevents相关依赖库，所以到这边你也就安装到你的windows上边了。你可以检查你的package.json 文件中是不是有fsevents相关依赖，删除即好！
* 如果没有，删除node_modules文件夹，重新安装各项依赖就好了
* 解决:fsevent是mac osx系统的，你是在win或者Linux下使用了 所以会有警告，忽略即可
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作者：郭郭的小郭郭
来源：CSDN
原文：https://blog.csdn.net/qq_35899070/article/details/82841930
版权声明：本文为博主原创文章，转载请附上博文链接！
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: want
原文：https://www.cnblogs.com/godkzzz/p/10577740.html