webpack.config.js

const path = require('path');

module.exports = {
    devServer: {
        contentBase: path.join(__dirname, 'dist'),
        compress: true,
        port: 9000
    },
    entry: './src/index.js',
    mode: 'development',
    output: {
        filename: 'main.js',
        path: path.resolve(__dirname, 'dist'),
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    'style-loader',
                    'css-loader',
                ],
            },
            {
                test: /\.(png|svg|jpg|gif|dzi)$/,
                use: [
                    'file-loader',
                ],
            },
            {
                test: /\.m?js$/,
                exclude: /(bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        plugins: ['@babel/plugin-proposal-class-properties'],
                        presets: ['@babel/preset-env']
                    }
                }
            },
            {
                test: /\.(csv|tsv)$/,
                use: [
                    'csv-loader',
                ],
            },
        ],
    },
};