临时维护老项目，执行构建打包命令，例如 npm run build:prod 时报错如下：
TypeError: Cannot read property 'compilation' of undefined
at OptimizeCssAssetsWebpackPlugin.apply
......
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! XDO@1.0.0 build:prod: `cross-env NODE_ENV=production node build/build.js`
npm ERR! Exit status 1
npm ERR!
发现webpack 的版本是 2.5.1【好低】，但是 optimize-css-assets-webpack-plugin 的版本是 ^5.0.3，有点狠，查了些资料，选择 3.2.0版本，执行操作：
cnpm i optimize-css-assets-webpack-plugin@3.2.0
搞定！
Uncaught TypeError: Cannot read property 'childComponent'...
Cannot read property 'sessionid' of undefined TypeError: ...
Uncaught TypeError: Cannot read property 'appendChild' of...
Uncaught TypeError: Cannot read property 'child' of null ...
error: bundling failed: TypeError: Cannot read property '...
TypeError: Cannot read property 'renderRoute' of undefine...
Uncaught TypeError: Cannot read property 'call' of undefi...
TypeError: Cannot read property '_id' of undefinedat /hom...
TypeError: Cannot read property 'upgrade' of undefined这个错...
TypeError: Cannot read property 'length' of undefined[Vue...
本文标题：TypeError: Cannot read property
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