● package.json 的 dev-server 命令改了：
新："dev": "webpack serve --config build/webpack.dev.js"
旧："dev": "webpack-dev-server --config build/webpack.dev.js",
● module.rules
新：use: ['xxx-loader']
旧：loader: ['xxx-loader']
● filename
新：filename: 'bundle.[contenthash:8].js'
旧：filename: 'bundle.[contentHash:8].js'
● 周边工具的升级之 webpack-merge
新：const { merge } = require('webpack-merge')
旧：const { smart } = require('webpack-merge')
● 周边工具的升级之 clean-webpack-plugin
新：const { CleanWebpackPlugin } = require('clean-webpack-plugin')
旧：const CleanWebpackPlugin = require('clean-webpack-plugin')
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