Using Webpack Encore for your website assets

Webpack Encore is a tool to manage your javascript and css assets. It seamlessly integrates webpack into your symfony application.


First add the WebpackEncoreBundle as a dependency to your composer.json file.

composer require symfony/webpack-encore-bundle

To enable it, add the following line to the config/bundles.php file, if that has not been done already for you by Symfony Flex:

return [
    Symfony\WebpackEncoreBundle\WebpackEncoreBundle::class => ['all' => true],


There are several files and directories added to your project by Symfony Flex:

  • assets/css/
  • assets/js/
  • config/packages/assets.yaml
  • config/packages/prod/webpack_encore.yaml
  • config/packages/test/webpack_encore.yaml
  • config/packages/webpack_encore.yaml
  • package.json
  • webpack.config.js

In a normal Symfony application, that would already work fine, but to use Webpack Encore with Sulu, some configuration has to be adjusted, because there is an additional Javascript application for Sulu’s admin interface.

To continue, create a directory assets/website/ and move the following directories into that directory:

  • assets/css/
  • assets/js/

Next, add the following changes to webpack.config.js:

     // directory where compiled assets will be stored
-    .setOutputPath('public/build/')
+    .setOutputPath('public/build/website/')
     // public path used by the web server to access the output path
-    .setPublicPath('/build')
+    .setPublicPath('/build/website')
     // only needed for CDN's or sub-directory deploy

      * 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('app', './assets/website/js/app.js')
     //.addEntry('page1', './assets/js/page1.js')
     //.addEntry('page2', './assets/js/page2.js')

Because of the above changes, you also have to change the following configuration files:

  • config/packages/assets.yaml
-        json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'
+        json_manifest_path: '%kernel.project_dir%/public/build/website/manifest.json'
  • and config/packages/webpack_encore.yaml
     # The path where Encore is building the assets - i.e. Encore.setOutputPath()
-    output_path: '%kernel.project_dir%/public/build'
+    output_path: '%kernel.project_dir%/public/build/website'
     # If multiple builds are defined (as shown below), you can disable the default build:
     # output_path: false

Luckily, Webpack Encore provides a deadly simple way to link to your built assets inside your html. Therefore, change the following lines in your base template at templates/base.html.twig:

-    {% block style %}{% endblock %}
+    {% block style %}
+        {{ encore_entry_link_tags('app') }}
+    {% endblock %}

-    {% block javascripts %}{% endblock %}
+    {% block javascripts %}
+        {{ encore_entry_script_tags('app') }}
+    {% endblock %}

And that’s it!


Now you are ready to add your scripts and styles in assets/website/js and assets/website/css. When you finished your changes, open your terminal in the root directory and run

npm install
npm run build

Now you should be able to see the outcome in the browser.


For further customization of your frontend setup, follow the Webpack Encore Documentation.