module.exports = {
    entry: {
        a: ['./src/a.js'],
        aWithFetch: ['whatwg-fetch', './src/a.js'],
    },
    output: {
        filename: '[name].js'
    },
    module: {
        rules: [{
            test: /\.m?js$/,
            exclude: /node_modules/,
            use: {
                loader: 'babel-loader',
                options: {
                    presets: [
                        ['@babel/preset-env', {
                            useBuiltIns: 'usage',
                            corejs: 3
                        }]
                    ]
                }
            }
        }]
    }
};