di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Framework\GraphQl\Schema\SchemaGeneratorInterface" type="Magento\Framework\GraphQl\Schema\SchemaGenerator" />
    <preference for="Magento\Framework\GraphQl\Query\Resolver\ContextInterface" type="Magento\GraphQl\Model\Query\Resolver\Context" />
    <preference for="Magento\Framework\GraphQl\Schema\Type\Entity\MapperInterface" type="Magento\Framework\GraphQl\Schema\Type\Entity\DefaultMapper"/>
    <preference for="Magento\Framework\GraphQl\Schema\Type\Enum\DataMapperInterface" type="Magento\Framework\GraphQl\Schema\Type\Enum\DefaultDataMapper"/>
    <preference for="Magento\Framework\GraphQlSchemaStitching\GraphQlReader\TypeMetaReaderInterface" type="Magento\Framework\GraphQlSchemaStitching\GraphQlReader\TypeReaderComposite"/>
    <type name="Magento\Framework\App\AreaList">
        <arguments>
            <argument name="areas" xsi:type="array">
                <item name="graphql" xsi:type="array">
                    <item name="frontName" xsi:type="string">graphql</item>
                </item>
            </argument>
        </arguments>
    </type>
    <preference for="Magento\Framework\GraphQl\ConfigInterface" type="Magento\Framework\GraphQl\Config"/>
    <preference for="Magento\Framework\GraphQl\Config\ConfigElementFactoryInterface" type="Magento\Framework\GraphQl\Config\ConfigElementFactory"/>
    <type name="Magento\Framework\GraphQl\Config\ConfigElementFactory">
        <arguments>
            <argument name="factoryMapByConfigElementType" xsi:type="array">
                <item name="graphql_interface" xsi:type="object">Magento\Framework\GraphQl\Config\Element\InterfaceFactory</item>
                <item name="graphql_type" xsi:type="object">Magento\Framework\GraphQl\Config\Element\TypeFactory</item>
                <item name="graphql_input" xsi:type="object">Magento\Framework\GraphQl\Config\Element\InputFactory</item>
                <item name="graphql_enum" xsi:type="object">Magento\Framework\GraphQl\Config\Element\EnumFactory</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Framework\GraphQl\Config">
        <arguments>
            <argument name="data" xsi:type="object">Magento\Framework\GraphQl\Config\Data</argument>
        </arguments>
    </type>
    <virtualType name="Magento\Framework\GraphQl\Config\Data" type="Magento\Framework\Config\Data">
        <arguments>
            <argument name="reader" xsi:type="object">Magento\Framework\GraphQlSchemaStitching\Reader</argument>
            <argument name="cacheId" xsi:type="string">Magento_Framework_GraphQlSchemaStitching_Config_Data</argument>
        </arguments>
    </virtualType>
    <virtualType name="Magento\Framework\GraphQl\Config\SchemaLocator" type="Magento\Framework\Config\SchemaLocator">
        <arguments>
            <argument name="realPath" xsi:type="string">urn:magento:module:Magento_GraphQl:etc/graphql.xsd</argument>
        </arguments>
    </virtualType>
    <virtualType name="Magento\Framework\GraphQlSchemaStitching\Reader" type="Magento\Framework\GraphQlSchemaStitching\Common\Reader">
        <arguments>
            <argument name="readers" xsi:type="array">
                <item name="graphql_reader" xsi:type="object">Magento\Framework\GraphQlSchemaStitching\GraphQlReader</item>
            </argument>
        </arguments>
    </virtualType>
    <type name="Magento\Framework\GraphQl\Schema\Type\TypeRegistry">
        <arguments>
            <argument name="configToTypeMap" xsi:type="array">
                <item name="Magento\Framework\GraphQl\Config\Element\Type" xsi:type="string">Magento\Framework\GraphQl\Schema\Type\Output\OutputTypeObject</item>
                <item name="Magento\Framework\GraphQl\Config\Element\Input" xsi:type="string">Magento\Framework\GraphQl\Schema\Type\Input\InputObjectType</item>
                <item name="Magento\Framework\GraphQl\Config\Element\InterfaceType" xsi:type="string">Magento\Framework\GraphQl\Schema\Type\Output\OutputInterfaceObject</item>
                <item name="Magento\Framework\GraphQl\Config\Element\Enum" xsi:type="string">Magento\Framework\GraphQl\Schema\Type\Enum\Enum</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper">
        <arguments>
            <argument name="formatter" xsi:type="object">Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\FormatterComposite</argument>
        </arguments>
    </type>
    <type name="Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\FormatterComposite">
        <arguments>
            <argument name="formatters" xsi:type="array">
                <item name="fields" xsi:type="object">Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\Formatter\Fields</item>
                <item name="interfaces" xsi:type="object">Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\Formatter\Interfaces</item>
                <item name="resolveType" xsi:type="object">Magento\Framework\GraphQl\Schema\Type\Output\ElementMapper\Formatter\ResolveType</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Framework\GraphQlSchemaStitching\GraphQlReader\TypeReaderComposite">
        <arguments>
            <argument name="typeReaders" xsi:type="array">
                <item name="enum_type" xsi:type="object">Magento\Framework\GraphQlSchemaStitching\GraphQlReader\Reader\EnumType</item>
                <item name="object_type" xsi:type="object">Magento\Framework\GraphQlSchemaStitching\GraphQlReader\Reader\ObjectType</item>
                <item name="input_object_type" xsi:type="object">Magento\Framework\GraphQlSchemaStitching\GraphQlReader\Reader\InputObjectType</item>
                <item name="interface_type" xsi:type="object">Magento\Framework\GraphQlSchemaStitching\GraphQlReader\Reader\InterfaceType</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Framework\GraphQl\Query\QueryComplexityLimiter">
        <arguments>
            <argument name="queryDepth" xsi:type="number">20</argument>
            <argument name="queryComplexity" xsi:type="number">300</argument>
        </arguments>
    </type>
</config>