webpack.config.js

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

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

Encore
    .setOutputPath('public/build/')
    .setPublicPath('/build')

    .copyFiles({
        from: './assets/images',
        to: 'images/[path][name].[ext]',
    })

    .addEntry('app', './assets/app.js')
    .enableStimulusBridge('./assets/controllers.json')
    .splitEntryChunks()
    .enableSingleRuntimeChunk()
    .enablePostCssLoader()

    /*
     * FEATURE CONFIG
     *
     * Enable & configure other features below. For a full
     * list of features, see:
     * https://symfony.com/doc/current/frontend.html#adding-more-features
     */
    .cleanupOutputBeforeBuild()
    .enableBuildNotifications()
    .enableSourceMaps(!Encore.isProduction())
    // enables hashed filenames (e.g. app.abc123.css)

    // configure Babel
    // .configureBabel((config) => {
    //     config.plugins.push('@babel/a-babel-plugin');
    // })

    // enables and configure @babel/preset-env polyfills
    .configureBabelPresetEnv((config) => {
        config.useBuiltIns = 'usage';
        config.corejs = '3.23';
    })

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

    // uncomment if you use TypeScript
    //.enableTypeScriptLoader()

    .enableReactPreset()
    .addEntry('admin', './assets/js/admin.js')

    // uncomment to get integrity="..." attributes on your script & link tags
    // requires WebpackEncoreBundle 1.4 or higher
    //.enableIntegrityHashes(Encore.isProduction())

    // uncomment if you're having problems with a jQuery plugin
    //.autoProvidejQuery()
;

module.exports = Encore.getWebpackConfig();