📝 Editing: webpack.config.js

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

// 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');
}
if(process.env.APP_ENV === 'prod') {
    console.log(process.env.APP_ENV);
    Encore
        .setOutputPath('public/assets/')
        .setPublicPath('/assets')
        .addEntry('app', './assets/js/app.js')
        .splitEntryChunks()
        .enableSingleRuntimeChunk()
        .cleanupOutputBeforeBuild()
        .enableBuildNotifications()
        .enableSourceMaps(!Encore.isProduction())
        .enableVersioning(Encore.isProduction())
        .configureBabel(() => {}, {
            useBuiltIns: 'usage',
            corejs: 3
        })
        .enableSassLoader()
} else {
    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')
        // only needed for CDN's or sub-directory deploy
        //.setManifestKeyPrefix('build/')

/*
         * ENTRY CONFIG
         *
         * Add 1 entry for each "page" of your app
         * (including one that's included on every page - e.g. "app")
         *
         * 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('page1', './assets/js/page1.js')
        //.addEntry('page2', './assets/js/page2.js')

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

// enables @babel/preset-env polyfills
        .configureBabel(() => {
        }, {
            useBuiltIns: 'usage',
            corejs: 3
        })

// enables Sass/SCSS support
        .enableSassLoader()

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

// 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()

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

module.exports = Encore.getWebpackConfig();

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📝 Editing: webpack.config.js