webpack-vue/build/webpack.dev.conf.js

// 存放dev配置
const merge = require('webpack-merge');
const webpack = require('webpack');
const baseConfig = require('./webpack.base.conf');
const path = require('path');

module.exports = merge(baseConfig, {
  mode: 'development',
  devtool: 'inline-source-map',
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader', 
          'postcss-loader'
        ]
      }
    ]
  },
  devServer: {
    contentBase: path.resolve(__dirname, '../dist'), //告诉服务其从哪提供内容
    hot: true,
    open: true
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(), // 开启热更新
    new webpack.DefinePlugin({
      'process.env': require('../config/dev.env')
    }), // 配置请求地址
  ]
})