Theme.php
public function getRegisteredWrapper($wrapperKey)
    {
        if (!isset($this->registeredWrappers[$wrapperKey])):
            throw new \Exception("Wrapper \"$wrapperKey\" is not registered.. Registered wrappers: " . implode(", ", array_keys($this->registeredWrappers)));
        endif;

        return $this->registeredWrappers[$wrapperKey];
    }
public function getRegisteredWrapper($wrapperKey)
    {
        if (!isset($this->registeredWrappers[$wrapperKey])):
            throw new \Exception("Wrapper \"$wrapperKey\" is not registered.. Registered wrappers: " . implode(", ", array_keys($this->registeredWrappers)));
        endif;

        return $this->registeredWrappers[$wrapperKey];
    }
Get wrapper by it´s key

@param string $wrapperKey
@return \stdClass
@throws \Exception