There are a few issues with PHP 8.4, all of them related to the implicitly nullable parameter being deprecated now, requiring an explicit marking declaration.
Checking the code using PHPCompatibility code sniffer:
FILE: /var/www/html/web/modules/contrib/storybook/src/Asset/UnoptimizedAssetResolver.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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49 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $language.
60 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $language.
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FILE: /var/www/html/web/modules/contrib/storybook/src/PathProcessor/AbsolutePathProcessor.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 1 LINE
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18 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $request.
18 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter:
| | $bubbleable_metadata.
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Time: 82ms; Memory: 6MB
exit status 1
Test the code base with PHPCompatibility code sniffer.
Fix deprecations.
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Active
1.0
Miscellaneous
maursilveira → changed the visibility of the branch 1.x to hidden.
I've created a merge request with the fixes for the PHP 8.4 deprecations.
I'm also attaching here a patch file for the same fixes, for composer patches.
Please let me know if you have any questions. Thank you.