Asset Versioning
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Read the updated version of this page for Symfony 6.2 (the current stable version).
Asset Versioning
Tired of deploying and having browser's cache the old version of your assets?
By calling enableVersioning(), each filename will now include a hash that
changes whenever the contents of that file change (e.g. app.123abc.js
instead of app.js). This allows you to use aggressive caching strategies
(e.g. a far future Expires) because, whenever a file change, its hash will change,
ignoring any existing cache:
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// webpack.config.js
// ...
Encore
.setOutputPath('public/build/')
// ...
+ .enableVersioning()To link to these assets, Encore creates a manifest.json file with a map to
the new filenames.
Loading Assets from the manifest.json File
Whenever you run Encore, a manifest.json file is automatically
created in your outputPath directory:
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{
"build/app.js": "/build/app.123abc.js",
"build/dashboard.css": "/build/dashboard.a4bf2d.css"
}In your app, you need to read this file to dynamically render the correct paths
in your script and link tags. If you're using Symfony, just activate the
json_manifest_file versioning strategy:
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# config/packages/framework.yaml
framework:
# ...
assets:
# feature is supported in Symfony 3.3 and higher
json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'That's it! Just be sure to wrap each path in the Twig asset() function
like normal:
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<script src="{{ asset('build/app.js') }}"></script>
<link href="{{ asset('build/dashboard.css') }}" rel="stylesheet" />
