null of type null is incompatible with the type Composer\Util\HttpDownloader expected by parameter $httpDownloader of Composer\Downloader\FileDownloader::__construct().
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
24
return new FileDownloader($appIO, $composerConfig, /** @scrutinizer ignore-type */ null, $cache);