webpack.config.js

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

// 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.
   */
  .addStyleEntry('email', './assets/css/email.scss')
  .addEntry('app', './assets/js/app.js')
  .copyFiles({
    from: './assets/images',
    to: 'images/[path][name].[ext]'
  })

  // 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())

  // auto prefix css for more browser support
  .enablePostCssLoader()

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

  // enables Sass/SCSS support
  .enableSassLoader(options => {
    options.implementation = require('sass')
    options.sassOptions.quietDeps = true
  })

  .autoProvidejQuery()

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

  .configureDevServerOptions(options => {
    options.devMiddleware = {
      writeToDisk: true
    }
  })

module.exports = Encore.getWebpackConfig()