Extender WPGraphQL

grapqlexample.php

<?php
/**
 * Plugin Name: GraphQL Example
 * Textdomain: graphqlexample
 */
/**
* Add logo and favicon images url to graphql schema in the rootquery. copy file into wp-content/plugins and then activate from Plugin's page.
**/
function get_logo()
{
    $custom_logo_id = get_theme_mod('custom_logo');
    $image = wp_get_attachment_image_src($custom_logo_id, 'full');
    return $image[0];
}

function get_favicon()
{
    return get_site_icon_url(32);
}

add_action('graphql_register_types', 'example_extend_wpgraphql_schema');

function example_extend_wpgraphql_schema()
{
    register_graphql_field('RootQuery', 'logoUrl', [
        'type' => 'String',
        'description' => __('Show logo image', 'graphqlexample'),
        'resolve' => function () {
            return get_logo();
        }
    ]);

    register_graphql_field('RootQuery', 'faviconUrl', [
        'type' => 'String',
        'description' => __('Show favicon', 'graphqlexample'),
        'resolve' => function () {
            return get_favicon();
        }
    ]);
};