Why doesn't w2ui work when building with Webpack?

Question

JavaScript

W2ui does not work if you build with webpack. When connecting w2ui with a script on an html page, everything is fine.
The contents of the file with import libraries:

require('../libs/jquery/jquery-ui.css');
window.$ = window.jQuery = require('jquery');
require('jquery.browser');
require('jquery-ui');
require('w2ui/w2ui-1.4.2.min');
require('w2ui/w2ui-1.4.2.min.css');
require('../libs/gwtk.css');
require('../libs/gwtkse.js');

webpack.config:

var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var CommonsChunkPlugin = require("webpack/lib/optimize/CommonsChunkPlugin");
var HtmlWebpackPlugin = require('html-webpack-plugin');
var CleanWebpackPlugin = require('clean-webpack-plugin');
var precss = require('precss');
var autoprefixer = require('autoprefixer');
var CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
    entry: {
        'app': './src/app.js'
    },
    output: {
        path: './build',
        filename: `[name].min.js`,
        chunkFilename: '[name].min.js',
        // publicPath: 'http://localhost:3000/'
    },
    devServer: {
        outputPath: './dist',
        port: 3000,
        hot: true
    },
    resolve: {
        extensions: ['', '.js']
    },
    // devtool: 'source-map',
    module: {
        loaders: [
            {test: /\.js$/, loader: 'babel', exclude: /node_modules/},
            {test: /\.css$/, loader: ExtractTextPlugin.extract("css?sourceMap!postcss")},
            {test: /\.less$/, loader: ExtractTextPlugin.extract('css?sourceMap!postcss!less?sourceMap')},
            {test: /\.woff(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/font-woff"},
            {test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/font-woff"},
            {test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/octet-stream"},
            {test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: "file"},
            {test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=image/svg+xml"},
            {test: /\.(png|jpg)$/, loader: 'file?name=img/[name].[ext]'},
            {test: /\.html$/, loader: 'raw'}
        ]
    },
    postcss: function () {
        return [precss, autoprefixer];
    },
    plugins: [
        new CleanWebpackPlugin('./build', {root: `${__dirname}/..`}),
        new ExtractTextPlugin(`[name].min.css`, {allChunks: true}),
        new HtmlWebpackPlugin({template: './index.html'})
    ]
};

Answer 1

This question and Script-loader helped