Using a CDN

Are you deploying to a CDN? That's awesome :) - and configuring Encore for that is easy. Once you've made sure that your built files are uploaded to the CDN, configure it in Encore:

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// webpack.config.js
// ...

Encore
    .setOutputPath('public/build/')
    // in dev mode, don't use the CDN
    .setPublicPath('/build');
    // ...
;

+ if (Encore.isProduction()) {
+     Encore.setPublicPath('https://my-cool-app.com.global.prod.fastly.net');
+
+     // guarantee that the keys in manifest.json are *still*
+     // prefixed with build/
+     // (e.g. "build/dashboard.js": "https://my-cool-app.com.global.prod.fastly.net/dashboard.js")
+     Encore.setManifestKeyPrefix('build/');
+ }

That's it! Internally, Webpack will now know to load assets from your CDN - e.g. https://my-cool-app.com.global.prod.fastly.net/dashboard.js.

You do need to make sure that the script and link tags you include on your pages also use the CDN. Fortunately, the manifest.json paths are updated to point to the CDN. In Symfony, as long as you've configured Asset Versioning, you're done! The manifest.json file includes the full CDN URL:

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{# Your script/link tags don't need to change at all to support the CDN #}
<script src="{{ asset('build/dashboard.js') }}"></script>