src/Application.php
protected function getContainerInitializer()
    {
        $initializer = new DefaultInitializer($this->getConfigurationProvider());
        if ($this->cache) {
            $initializer = new CachedInitializer($initializer, $this->getCacheDir());
        }

        return $initializer;
    }
protected function getContainerInitializer()
    {
        $initializer = new DefaultInitializer($this->getConfigurationProvider());
        if ($this->cache) {
            $initializer = new CachedInitializer($initializer, $this->getCacheDir());
        }

        return $initializer;
    }
Returns a ContainerInitializer.

A ContainerInitializer creates fully-built, ready-to-use containers.

@return ContainerInitializerInterface