Vendor

vendor/nuwave/lighthouse/src/Schema/Directives/InterfaceDirective.php

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+<?php
+
+namespace Nuwave\Lighthouse\Schema\Directives;
+
+use Nuwave\Lighthouse\Support\Contracts\DefinedDirective;
+
+class InterfaceDirective extends BaseDirective implements DefinedDirective
+{
+    /**
+     * Name of the directive.
+     *
+     * @return string
+     */
+    public function name(): string
+    {
+        return 'interface';
+    }
+
+    public static function definition(): string
+    {
+        return /* @lang GraphQL */ <<<'SDL'
+"""
+Use a custom resolver to determine the concrete type of an interface.
+"""
+directive @interface(      
+  """
+  Reference to a custom type-resolver function.
+  Consists of two parts: a class name and a method name, seperated by an `@` symbol.
+  If you pass only a class name, the method name defaults to `__invoke`.
+  """
+  resolveType: String!
+) on INTERFACE
+SDL;
+    }
+}