Component::resolveDependencies

public function resolveDependencies(): ?array
    {
	$rootDeps = $this->getDependencyList();
	$deps = [];

	array_walk($rootDeps, function ($ext) use (&$deps) {
		$list = (new Extension($ext))->getDependencies();
		$deps = array_merge($deps, $list);
	});

	return array_unique($deps);
}