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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" />