webpack.config.js

var Encore = require('@symfony/webpack-encore');
Encore
// the project directory where all compiled assets will be stored
  .setOutputPath('public/build/')

  // the public path used by the web server to access the previous directory
  .setPublicPath('/build')

  // will create public/build/app.js and public/build/app.css
  .addEntry('app', './assets/js/app.js')

  // allow legacy applications to use $/jQuery as a global variable
  .autoProvidejQuery()

  // enable source maps during development
  .enableSourceMaps(!Encore.isProduction())

  // empty the outputPath dir before each build
  .cleanupOutputBeforeBuild()

  // show OS notifications when builds finish/fail
  .enableBuildNotifications()
  // create hashed filenames (e.g. app.abc123.css)
  .enableVersioning(Encore.isProduction())

  // allow sass/scss files to be processed
  .enableSassLoader()

  // allow css treatment
  // Automatically get his config in postcss.config.js file at root
  .enablePostCssLoader()
;
// Use polling instead of inotify
const config = Encore.getWebpackConfig();

// with NFS wait before build chunks
config.watchOptions.poll = true;

module.exports = config;