// We need the root package so we can add our classmaps to its loader.
$package =
$event->
getComposer()->
getPackage();
// We need the local repository so that we can query and see if it's likely
// that our files are present there.
$repository =
$event->
getComposer()->
getRepositoryManager()->
getLocalRepository();
// This is, essentially, a null constraint. We only care whether the package
// is present in the vendor directory yet, but findPackage() requires it.
$constraint =
new Constraint('>', ''
);
// It's possible that there is no classmap specified in a custom project
// composer.json file. We need one so we can optimize lookup for some of our
// dependencies.
$autoload =
$package->
getAutoload();
if (!
isset($autoload['classmap'
])) { $autoload['classmap'
] =
[];
} // Check for packages used prior to the default classloader being able to
// use APCu and optimize them if they're present.
// @see \Drupal\Core\DrupalKernel::boot()
if ($repository->
findPackage('symfony/http-foundation',
$constraint)) { $autoload['classmap'
] =
array_merge($autoload['classmap'
],
[ $vendor_dir . '/symfony/http-foundation/Request.php',
$vendor_dir . '/symfony/http-foundation/RequestStack.php',
$vendor_dir . '/symfony/http-foundation/ParameterBag.php',