Webpack 5

webpack.config.js

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

module.exports = {
    entry: './src',
    output: {
        path: path.resolve(__dirname, './public'),
        filename: 'index.js'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                loader: 'babel-loader',
                query: {
                    presets: ['env']
                }
            }
        ]
    },
};