问题概述

近日在升级npm安装包imagemin-webpack-plugin和imagemin-mozjpeg时，分别报错npm ERR! Failed at the gifsicle@4.0.1 postinstall script.和npm ERR! Failed at the mozjpeg@7.0.0 postinstall script. 将npm register改为国内淘宝镜像还是无法解决该问题。

解决方法

经过分析后发现是由于安装这些包时需要安装依赖包，而其中部分依赖包需要从GitHub上下载，而GitHub的资源库DNS有问题，导致这些依赖包无法安装而报错。

找到原因是由于Github DNS的问题。我们再本地host文件中添加以下内容，然后用npm清楚所有缓存（清除命令为：>npm cache clean -f），之后再重新安装就成功了

52.74.223.119     github.com
192.30.253.119    gist.github.com
54.169.195.247    api.github.com
185.199.111.153   assets-cdn.github.com
151.101.76.133    raw.githubusercontent.com
151.101.76.133    gist.githubusercontent.com
151.101.76.133    cloud.githubusercontent.com
151.101.76.133    camo.githubusercontent.com
151.101.76.133    avatars0.githubusercontent.com
151.101.76.133    avatars1.githubusercontent.com
151.101.76.133    avatars2.githubusercontent.com
151.101.76.133    avatars3.githubusercontent.com
151.101.76.133    avatars4.githubusercontent.com
151.101.76.133    avatars5.githubusercontent.com
151.101.76.133    avatars6.githubusercontent.com
151.101.76.133    avatars7.githubusercontent.com
151.101.76.133    avatars8.githubusercontent.com

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