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Twig Components / Methods / preload

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preload(uri, attributes = []) is a Twig function to preload an asset by wrapping it with the preload() function.

<head>
    <!-- ... -->
    <link rel="preload" href="{{ preload(asset('build/app.css')) }}">
</head>

To do that, first install the WebLink component:

composer require symfony/web-link

Source: Symfony

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