Basic webpack config

webpack.config.js

var path = require('path');

module.exports = {
    entry: './app/index.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist')
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                query: {
                    presets:['react']
                }
            }
        ]
    }
};