webpack3升级webpack4

cnpm i webpck webpack-cli -D

cnpm i webpack-cli -D

cnpm update

npm WARN deprecated extract-text-webpack-plugin@3.0.2: Deprecated. Please use https://github.com/webpack-contrib/mini-css-extract-plugin
npm WARN deprecated browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.

删除

webpack3升级webpack4

原文：https://www.cnblogs.com/zhoudawei/p/11633102.html