Empty cart creation added

app/code/Magento/QuoteGraphQl/Model/Resolver/Cart/CreateEmptyCart.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver\Cart;
+
+use Magento\Framework\GraphQl\Query\Resolver\Value;
+use Magento\Framework\GraphQl\Query\Resolver\ValueFactory;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Quote\Api\GuestCartManagementInterface;
+use Magento\Quote\Api\CartManagementInterface;
+use Magento\Authorization\Model\UserContextInterface;
+
+/**
+ * {@inheritdoc}
+ */
+class CreateEmptyCart implements ResolverInterface
+{
+    /**
+     * @var CartManagementInterface
+     */
+    private $cartManagement;
+
+    /**
+     * @var GuestCartManagementInterface
+     */
+    private $guestCartManagement;
+
+    /**
+     * @var ValueFactory
+     */
+    private $valueFactory;
+
+    /**
+     * @var UserContextInterface
+     */
+    private $userContext;
+
+    /**
+     * @param CartManagementInterface $cartManagement
+     * @param GuestCartManagementInterface $guestCartManagement
+     * @param ValueFactory $valueFactory
+     * @param UserContextInterface $userContext
+     */
+    public function __construct(
+        CartManagementInterface $cartManagement,
+        GuestCartManagementInterface $guestCartManagement,
+        ValueFactory $valueFactory,
+        UserContextInterface $userContext
+    ) {
+        $this->cartManagement = $cartManagement;
+        $this->guestCartManagement = $guestCartManagement;
+        $this->valueFactory = $valueFactory;
+        $this->userContext = $userContext;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null) : Value
+    {
+        $customerId = $this->userContext->getUserId();
+
+        if ($customerId) {
+            $cartId = $this->cartManagement->createEmptyCartForCustomer($customerId);
+        } else {
+            $cartId = $this->guestCartManagement->createEmptyCart();
+        }
+
+        $result = function () use ($cartId) {
+            return $cartId;
+        };
+
+        return $this->valueFactory->create($result);
+    }
+}

app/code/Magento/QuoteGraphQl/composer.json

@@ -0,0 +1,25 @@
+{
+    "name": "magento/module-quote-graph-ql",
+    "description": "N/A",
+    "type": "magento2-module",
+    "require": {
+        "php": "~7.1.3||~7.2.0",
+        "magento/framework": "*"
+    },
+    "suggest": {
+        "magento/module-graph-ql": "*",
+        "magento/module-catalog-graph-ql": "*"
+    },
+    "license": [
+        "OSL-3.0",
+        "AFL-3.0"
+    ],
+    "autoload": {
+        "files": [
+            "registration.php"
+        ],
+        "psr-4": {
+            "Magento\\QuoteGraphQl\\": ""
+        }
+    }
+}

app/code/Magento/QuoteGraphQl/etc/module.xml

@@ -0,0 +1,14 @@
+<?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:Module/etc/module.xsd">
+    <module name="Magento_QuoteGraphQl">
+        <sequence>
+            <module name="Magento_GraphQl"/>
+        </sequence>
+    </module>
+</config>

app/code/Magento/QuoteGraphQl/etc/schema.graphqls

@@ -0,0 +1,6 @@
+# Copyright © Magento, Inc. All rights reserved.
+# See COPYING.txt for license details.
+
+type Mutation {
+    createEmptyCart: String @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\Cart\\CreateEmptyCart") @doc(description:"Creates empty shopping cart for guest or logged in user")
+}

app/code/Magento/QuoteGraphQl/registration.php

@@ -0,0 +1,10 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::MODULE, 'Magento_QuoteGraphQl', __DIR__);