wp-graphql-track-gettext.php

<?php
/**
 * Plugin Name: WPGraphQL Track GetText
 * Description: Test plugin for tracking the number of times the wp-graphql textdomain is translated during a WPGraphQL request. The count is output in the "extensions" portion of the graphql response. 
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class TestGetText {

	/**
	 * @var array
	 */
	protected $gettext_log = [];

	/**
	 * Constructor
	 */
	public function __construct() {
		// Reset at the very start of schema generation
		add_action( 'graphql_process_http_request', [ $this, 'init_log' ], 1 );

		// Track all translations
		add_filter(
			'gettext',
			function ( $translation, $text, $domain ) {
				if ( 'wp-graphql' === $domain ) {
					$this->gettext_log[] = $text;
				}
				return $translation;
			},
			10,
			3
		);

		// Add to extensions
		add_filter( 'graphql_request_results', [ $this, 'add_to_extensions' ], 10, 1 );
	}

	/**
	 * Initialize the log
	 */
	public function init_log(): void {
		$this->gettext_log = [];
	}

	/**
	 * Add translation data to GraphQL extensions
	 *
	 * @param \GraphQL\Executor\ExecutionResult $response The GraphQL response
	 */
	public function add_to_extensions( \GraphQL\Executor\ExecutionResult $response ): \GraphQL\Executor\ExecutionResult {
		$extensions                 = $response->extensions ?? [];
		$extensions['translations'] = [
			'count' => count( $this->gettext_log ),
			// 'log'   => $this->gettext_log,
		];
		$response->extensions       = $extensions;
		return $response;
	}
}

new TestGetText();