newsupernova/app/code/Smartwave/Porto/etc/di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
    <type name="Smartwave\Porto\Block\Template">
        <arguments>
            <argument name="customTemplate" xsi:type="array">
                <item name="context" xsi:type="string">\Magento\Framework\View\Element\Template\Context</item>
                <item name="registry" xsi:type="string">\Magento\Framework\Registry</item>
            </argument>
        </arguments>
    </type>
    <type name="Smartwave\Porto\Block\CategoryCollection">
        <arguments>
            <argument name="categoryCollection" xsi:type="array">
                <item name="context" xsi:type="string">\Magento\Framework\View\Element\Template\Context</item>
                <item name="helper" xsi:type="string">\Magento\Catalog\Helper\Category</item>
                <item name="flatstate" xsi:type="string">\Magento\Catalog\Model\Indexer\Category\Flat\State</item>
                <item name="menu" xsi:type="string">\Magento\Theme\Block\Html\Topmenu</item>
            </argument>
        </arguments>
    </type>
    <preference for="Magento\Catalog\Controller\Category\View" type="Smartwave\Porto\Controller\Category\View" />
    <preference for="Magento\CatalogSearch\Controller\Result\Index" type="Smartwave\Porto\Controller\CatalogSearch\Result\Index" />
    <preference for="Magento\Catalog\Helper\Product\View" type="Smartwave\Porto\Helper\Product\View" />
    <type name="Magento\Framework\View\Result\Page">
        <plugin name="updateBodyClass" type="Smartwave\Porto\Plugin\UpdateBodyClass"/>
    </type>
</config>