最近电脑环境重新整顿一下打生产包发现一直异常：
/Users/xxxx/app-class-h5/node_modules/compression-webpack-plugin/dist/index.js:413
compiler.hooks.thisCompilation.tap(pluginName, compilation => {
^
TypeError: Cannot read property 'thisCompilation' of undefined
at CompressionPlugin.apply (/Users/xxxx/app-class-h5/node_modules/compression-webpack-plugin/dist/index.js:413:20)
at Compiler.apply (/Users/xxxx/app-class-h5/node_modules/tapable/lib/Tapable.js:375:16)
at webpack (/Users/xxxx/app-class-h5/node_modules/webpack/lib/webpack.js:33:19)
at /Users/fplei/xxxx/app-class-h5/build/build.js:19:3
at next (/Users/xxxx/app-class-h5/node_modules/rimraf/rimraf.js:83:7)
at CB (/Users/xxxx/app-class-h5/node_modules/rimraf/rimraf.js:119:9)
at /Users/xxxx/app-class-h5/node_modules/rimraf/rimraf.js:145:14
原因：版本不统一
解决：
compression-webpack-plugin （版本：1.1.12）
1- npm install –save-dev compression-webpack-plugin @1.1.12
extract-text-webpack-plugin （版本：3.0.0）
2- npm install –save-dev compression-webpack-plugin @3.0.0
copy-webpack-plugin（版本：4.0.1）
npm install –save-dev copy-webpack-plugin @4.0.1
注意，上述包如果有版本问题，请先使用 npm uninstall xxx 进行卸载再重新安装即可。