Webpack4 升级报错 Error: Cannot find module 'webpack-cli/bin/config-yargs' 等（含html-webpack-plu
Webpack4 升级时遇到的四个问题：
问题一 Error: Cannot find module 'webpack-cli/bin/config-yargs'；
问题二 TypeError: compilation.mainTemplate.applyPluginsWaterfall is not a function；
问题三 TypeError: Cannot read property 'eslint' of undefined；
问题四 TypeError: Cannot re
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