src/Synchronization/Query.php
public function setContentType($contentType)
    {
        if ($contentType instanceof ContentType) {
            $contentType = $contentType->getId();
        }

        $this->contentType = $contentType;

        $this->setType('Entry');

        return $this;
    }
public function setContentType($contentType)
    {
        if ($contentType instanceof ContentType) {
            $contentType = $contentType->getId();
        }

        $this->contentType = $contentType;

        $this->setType('Entry');

        return $this;
    }
Set the content type to which results should be limited. Set to NULL to not filter for a content type.

@param ContentType|string|null $contentType

@return $this