webpack

const path = require('path');
const HTMLPlugin = require('html-webpack-plugin');
const webpack = require('webpack');

const VueLoaderPlugin = require('vue-loader/lib/plugin');


const isDev = process.env.NODE_EVN === 'development';

const config = {
    target:'web',
    entry: path.join(__dirname, 'src/index.js'),
    output: {
        filename: 'bundle.js',
        path: path.join(__dirname, 'dist')
    },
    plugins: [
        new VueLoaderPlugin(),
        new webpack.DefinePlugin({
            'process.env':{
                NODE_EVN:isDev?'"development"' : '"production"'
            }
        }),
        new HTMLPlugin()
    ],
    module: {
        rules: [
            {
                test: /\.vue$/,
                loader: 'vue-loader'
            },
            {
                test: /\.css$/,
                use:[
                    'style-loader',
                    'css-loader'
                ]
            },
            {
                test:'/\.styl',
                use:[
                    'style-loader',
                    'css-loader',
                    'stylus-loader'
                ]
            },
            {
                test: /\.(gif|jpg|jpeg|png|svg)$/,
                use:[
                    {
                        loader:'url-loader',
                        options:{
                            limit:1024,
                            name:'[name].[ext]'
                        }
                    }
                ]
            }
        ]
    }
}

if(isDev){
    config.devServer = {
        port:8090,
        host:'0.0.0.0',
        overlay:{
            errors:true
        }
    }
}

module.exports = config;

package

{
  "name": "ssr-test",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "cross-env NODE_ENV=production webpack --config webpack.config.js",
    "dev": "cross-env NODE_ENV=development webpack-dev-server --config webpack.config.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "cross-env": "^7.0.3",
    "css-loader": "^5.2.0",
    "file-loader": "^6.2.0",
    "html-webpack-plugin": "^5.3.1",
    "style-loader": "^2.0.0",
    "stylus": "^0.54.8",
    "stylus-loader": "^5.0.0",
    "url-loader": "^4.1.1",
    "vue": "^2.6.12",
    "vue-loader": "^15.9.6",
    "vue-template-compiler": "^2.6.12",
    "webpack-serve": "^3.2.0"
  },
  "devDependencies": {
    "webpack-cli": "^4.6.0"
  },
  "description": ""
}

报错

试试这样写呢

"dev": "cross-env NODE_ENV=development webpack serve --config webpack.config.js"