Symfony get Asset Name in Assetic output

Using Assetic to manage web assets in Symfony applications is no longer recommended. Instead, use Webpack Encore. https://symfony.com/doc/current/frontend/assetic/index.html#dumping-asset-files

Page-Specific JavaScript or CSS (Multiple Entries) is described here: https://symfony.com/doc/current/frontend/encore/simple-example.html#multiple-javascript-entries

// webpack.config.js
Encore
    // ... general CSS file here...
    .addStyleEntry('some_page', './assets/css/assetName.css')
;

Using addStyleEntry() is supported, but not recommended. A better option is to follow the pattern above: use addEntry() to point to a JavaScript file, then require the CSS needed from inside of that.