A beginner, recently learning the project of Web pack packaging nodejs, but packaging is always unsuccessful, the most mistake is that I can not find the file, but I installed it with npm install, who has encountered this problem? Consult..
Error reporting information:

Specific configuration of files
package.json

{
  "name": "dome8_express",
  "version": "0.0.1",
  "main": "app.js",
  "author": "ljb",
  "license": "ISC",
  "description": "nodeJS --express --webpack",
  "scripts": {
    "start": "webpack",
    "server": "webpack-dev-server --open",
    "build": "webpack --mode production",
    "dev": "webpack --mode development",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "dependencies": {
    "babel-loader": "^8.0.4",
    "body-parser": "^1.18.3",
    "cookie-parser": "^1.4.3",
    "debug": "^4.1.0",
    "ejs": "^2.6.1",
    "errorhandler": "^1.5.0",
    "eventproxy": "*",
    "express": "^4.16.4",
    "express-session": "^1.15.6",
    "fs": "*",
    "html": "*",
    "method-override": "^3.0.0",
    "morgan": "^1.9.1",
    "mysql": "^2.16.0",
    "node-uuid": "^1.4.8",
    "serve-favicon": "^2.5.0",
    "uglifyjs-webpack-plugin": "^2.0.1",
    "webpack-cli": "^3.1.2"
  },
  "devDependencies": {
    "css-loader": "^1.0.0",
    "html-webpack-plugin": "^3.2.0",
    "style-loader": "^0.23.1",
    "webpack": "^4.20.2",
    "webpack-dev-server": "3.1.9"
  }
}

webpack.config.js

var path =                  require("path");
var webpack =               require('webpack');                     //Access built-in plug-ins
var HtmlWebpackPlugin  =    require('html-webpack-plugin');         //Installation through npm
var uglifyjsPlugin =        require('uglifyjs-webpack-plugin');

module.exports = {
    mode: 'production',
    devtool: 'eval-source-map',      //Packaging method

    // Webpack configuration: "webpack": "^4.20.2"
    entry:'./app.js',                //Entry file
    output: {                        //Export documents
        path: path.resolve(__dirname, "routes"),
        filename: "main.js"
    },
 
    //Server configuration: "webpack-dev-server": "3.1.9"
    devServer: {                        
        port:'8080',                    //port
        contentBase: "/public",         //The directory where the pages loaded by the local server are located
        historyApiFallback: true,     //not taken
        inline: true                    //Real time refresh
    },

    //module
    module:{
        rules:[
            {test:/\.css$/, use:'css-loader'},
            {test:/\.ts$/, use:'ts-loader'},
            //{test:/\.(js|jsx)$/,use: 'babel-loader'}
        ]
    },

    //html webpack plugin
    plugins:[
        new HtmlWebpackPlugin({
            template:'./public/views/login.html'
        })
    ],
     //Compress js
     optimization: {
        minimizer: [
            new uglifyjsPlugin({ uglifyOptions: {compress: false } })
        ]
    },
};

## Packing node JS project error with web pack: ERROR in. / node_modules / MySQL / lib / Connection. JS
Module not found: Error: Can't resolve 'net' in 'E:\NodeJs\workSpace\dome8_express\node_modules\mysql\lib'