webpack.config.js

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

// 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("/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())
  // enables hashed filenames (e.g. app.abc123.css)
  .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')
  .enableReactPreset()
  .configureDefinePlugin(options => {
    const env = dotenv.config();

    if (env.error) {
      throw env.error;
    }

    options["process.env"].REACT_APP_API = JSON.stringify(
      env.parsed.REACT_APP_API
    );
  });
module.exports = Encore.getWebpackConfig();