Using a CDN with Webpack Encore

Are you deploying to a CDN? That's awesome :) 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 entrypoints.json paths are updated to include the full URL to the CDN.

When deploying to a subdirectory of your CDN, you must add the path at the end of your URL - e.g. Encore.setPublicPath('https://my-cool-app.com.global.prod.fastly.net/awesome-website') will generate assets URLs like https://my-cool-app.com.global.prod.fastly.net/awesome-website/dashboard.js

If you are using Encore.enableIntegrityHashes() and your CDN and your domain are not the same-origin, you may need to set the crossorigin option in your webpack_encore.yaml configuration to anonymous or use-credentials to overcome CORS errors.