webpack.config.js

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

// Manually configure the runtime environment if not already configured yet by the "encore" command.
// It's useful when you use tools that rely on webpack.config.js file.
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(process.env.WEBPACK_PUBLIC_PATH || '/build')
    // only needed for CDN's or sub-directory deploy
    .setManifestKeyPrefix('build/')

    /*
     * ENTRY CONFIG
     *
     * Each entry will result in one JavaScript file (e.g. app.js)
     * and one CSS file (e.g. app.css) if your JavaScript imports CSS.
     */
    .addEntry('app', './assets/js/app.js')
    .addEntry('see', './assets/js/snake/index.js') /* Snake Easter Egg */

    // enables the Symfony UX Stimulus bridge (used in assets/bootstrap.js)
    .enableStimulusBridge('./assets/controllers.json')

    // When enabled, Webpack "splits" your files into smaller pieces for greater optimization.
    .splitEntryChunks()

    // will require an extra script tag for runtime.js
    // but, you probably want this, unless you're building a single-page app
    .enableSingleRuntimeChunk()

    /*
     * 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)
    .enableVersioning(Encore.isProduction())

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

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

    // Alias
    .addAliases({
        snake: `${__dirname}/assets/js/snake/`,
    })

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

    // uncomment if you use React
    //.enableReactPreset()

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

    .copyFiles({
      from: './assets/images',
      to: 'images/[path][name].[hash:8].[ext]',
    })

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

    // uncomment if you use API Platform Admin (composer req api-admin)
    //.enableReactPreset()
    //.addEntry('admin', './assets/js/admin.js')

    // Required for styles hot reloading with Webpack dev server
    .disableCssExtraction(Encore.isDevServer())
    .configureDevServerOptions(options => {
        // Watch Twig & yaml files to force reload the browser on changes:
        options.liveReload = true;
        options.watchFiles = [
            'templates/**/*.twig',
            'content/**/*.{yaml,md}',
        ];

        // Disable watching the static `public` folder since it would force a live reload on any change,
        // as the manifest.json file is always re-computed (but not required by the dev server):
        options.static.watch = false;
    })
;

module.exports = Encore.getWebpackConfig();