webpack.config.js

var path = require('path');
const webpack = require('webpack')

module.exports = {
    entry: './src/main/js/app.js',
    devtool: 'sourcemaps',
    cache: true,
    mode: 'development',
    output: {
        path: __dirname,
        filename: './src/main/resources/static/built/bundle.js'
    },
    module: {
        rules: [
            {
                test: path.join(__dirname, '.'),
                exclude: /(node_modules)/,
                use: [{
                    loader: 'babel-loader',
                    options: {
                        presets: ["@babel/preset-env", ["@babel/preset-react", {
                            "throwIfNamespace": false
                        }]]
                    }
                }]
            },
            {
                test: /\.(png|jp(e*)g|svg|gif)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: 'images/[hash]-[name].[ext]',
                        },
                    },
                ],
            },
            {
                test: /\.(css|less)$/,
                use: ["style-loader", "css-loader"]
            }
        ]
    },
    plugins: [
        new webpack.optimize.LimitChunkCountPlugin({ maxChunks: 1 })
    ]
};