Magento_CustomerGraphQl module
This module provides type and resolver information for the GraphQl module to generate customer information endpoints.
Installation
Before installing this module, note that the Magento_CustomerGraphQl is dependent on the following modules:
Magento_GraphQl
Magento_Customer
Before disabling or uninstalling this module, note that the following modules depends on this module:
Magento_WishlistGraphQl
For information about a module installation in Magento 2, see Enable or disable modules.
Extensibility
Extension developers can interact with the Magento_CustomerGraphQl module. For more information about the Magento extension mechanism, see Magento plugins.
The Magento dependency injection mechanism enables you to override the functionality of the Magento_CustomerGraphQl module.
Additional information
You can get more information about GraphQl In Magento 2.
GraphQl Query
customer
query - returns information about the logged-in customer, store credit history and customer's wishlistisEmailAvailable
query - checks whether the specified email has already been used to create a customer account. A value of true indicates the email address is available, and the customer can use the email address to create an account
Learn more about customer query. Learn more about isEmailAvailable query.