webpack.config.js

var Encore = require('@symfony/webpack-encore');

if (!Encore.isRuntimeEnvironmentConfigured()) {
    Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev');
}

Encore
    // directory where compiled assets will be stored
    .setOutputPath('public/build/')
    // public path used by the web server to access the output path
    .setPublicPath('/build')

    /*
     * ENTRY CONFIG
     */
    .addEntry('app', './assets/js/app.js')
    .addEntry('login', './assets/js/login.js')
    .splitEntryChunks()
    .enableSingleRuntimeChunk()

    /*
     * FEATURE CONFIG
     */
    .cleanupOutputBeforeBuild()
    .enableBuildNotifications()
    .enableSourceMaps(!Encore.isProduction())
    .enableVersioning(Encore.isProduction())

    // enables @babel/preset-env polyfills
    .configureBabelPresetEnv((config) => {
        config.useBuiltIns = 'usage';
        config.corejs = 3;
    })

    // enables Sass/SCSS support
    .enableSassLoader()
;

module.exports = Encore.getWebpackConfig();