fix: check if classes are loaded by a different autoloader

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+- fix: Check if classes are loaded by a different autoloader before attempting to autoload them.
+
 ## v0.13.0
 
 **:warning: This release contains multiple breaking changes.**

src/Autoloader.php

@@ -32,10 +32,16 @@ public static function autoload(): bool {
 			return true;
 		}
 
+		// If the autoloader has already been loaded, then return true.
 		if ( self::$is_loaded ) {
 			return self::$is_loaded;
 		}
 
+		// If the main class has already been loaded, then they must be using a different autoloader.
+		if ( class_exists( 'WPGraphQL\GF\GF' ) ) {
+			return true;
+		}
+
 		$autoloader      = dirname( __DIR__ ) . '/vendor/autoload.php';
 		self::$is_loaded = self::require_autoloader( $autoloader );