Why doesn't the React application run with the bundle.js file?

Question

React

I am studying React, I made an assembly in webpack. When I start devserver everything works fine, but when I generate the bundle.js file and run it on a third-party server, the bundle.js file does not start. Rather, it is loaded (if you write console.log in it, then the inscription gives out in the console), but the application is not mounted to the mount-point.
webpack.config.js code:

var webpack = require('webpack');
var autoprefixer = require('autoprefixer');

module.exports = {
    entry: "./src/main.js",
    output: {
        path: __dirname + '/public/build/',
        publicPath: "build/",
        filename: "bundle.js"
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                use: [{
                    loader: 'babel-loader',
                    query: {
                        presets: ['es2015', 'stage-0', 'react']
                    }
                }],
                exclude: [/node_modules/, /public/],
            },
            {
                test: /\.jsx$/,
                use: [{
                    loader: 'babel-loader',
                    query: {
                        presets: ['es2015', 'stage-0', 'react']
                    }
                }],
                exclude: [/node_modules/, /public/]
            },
            {
                test: /\.css$/,
                use: [
                    {
                        loader: 'style-loader'
                    },
                    {
                        loader: 'css-loader',
                        options: {
                            sourceMap: true
                        }
                    },
                    {
                        loader: 'postcss-loader',
                        options: {
                            plugins: [
                                autoprefixer({
                                    browsers:['ie >= 8', 'last 4 version']
                                })
                            ],
                            sourceMap: true
                        }
                    }
                ],
                exclude: [/node_modules/, /public/]
            },
            {
                test: /\.scss$/,
                use: [
                    {
                        loader: 'style-loader'
                    },
                    {
                        loader: 'css-loader',
                        options: {
                            sourceMap: true
                        }
                    },
                    {
                        loader: 'postcss-loader',
                        options: {
                            plugins: [
                                autoprefixer({
                                    browsers:['ie >= 8', 'last 4 version']
                                })
                            ],
                            sourceMap: true
                        }
                    },
                    {
                        loader: 'sass-loader'
                    }
                ],
                exclude: [/node_modules/, /public/]
            },
            {
                test: /\.gif$/,
                loader: "url-loader?limit=10000&mimetype=image/gif"
            },
            {
                test: /\.jpg$/,
                loader: "url-loader?limit=10000&mimetype=image/jpg"
            },
            {
                test: /\.png$/,
                loader: "url-loader?limit=10000&mimetype=image/png"
            },
            {
                test: /\.svg$/,
                loader: "url-loader?limit=10000&mimetype=image/svg"
            }
        ]
    },
    mode: 'none'
}

package.json code:

{
  "name": "ReactJS",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "devserver": "webpack-dev-server --debug --hot --devtool eval-source-map --output-pathinfo --watch --colors --inline --content-base public --port 8090 --host localhost",
    "build": "webpack -p"
  },
  "author": "Stanislav Bykov",
  "license": "ISC",
  "dependencies": {
    "@material-ui/core": "^3.4.0",
    "@material-ui/icons": "^3.0.1",
    "classnames": "^2.2.6",
    "events": "^3.0.0",
    "flux": "^3.1.3",
    "jquery": "^3.3.1",
    "keymirror": "^0.1.1",
    "moment": "^2.23.0",
    "react": "^16.5.2",
    "react-dom": "^16.5.2",
    "react-router": "^4.3.1",
    "react-router-dom": "^4.3.1"
  },
  "devDependencies": {
    "autoprefixer": "^9.1.5",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.0.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1",
    "css-loader": "^1.0.0",
    "file-loader": "^2.0.0",
    "json-loader": "^0.5.7",
    "node-sass": "^4.9.3",
    "postcss-loader": "^3.0.0",
    "prop-types": "^15.6.2",
    "react-hot-loader": "^4.3.8",
    "sass-loader": "^7.1.0",
    "style-loader": "^0.23.0",
    "url-loader": "^1.1.1",
    "webpack": "^4.19.1",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.8"
  }
}