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Edit File: ScalarLeafs.php
<?php declare(strict_types=1); namespace Automattic\WooCommerce\Vendor\GraphQL\Validator\Rules; use Automattic\WooCommerce\Vendor\GraphQL\Error\Error; use Automattic\WooCommerce\Vendor\GraphQL\Language\AST\FieldNode; use Automattic\WooCommerce\Vendor\GraphQL\Language\AST\NodeKind; use Automattic\WooCommerce\Vendor\GraphQL\Type\Definition\Type; use Automattic\WooCommerce\Vendor\GraphQL\Validator\QueryValidationContext; class ScalarLeafs extends ValidationRule { public function getVisitor(QueryValidationContext $context): array { return [ NodeKind::FIELD => static function (FieldNode $node) use ($context): void { $type = $context->getType(); if ($type === null) { return; } if (Type::isLeafType(Type::getNamedType($type))) { if ($node->selectionSet !== null) { $context->reportError(new Error( static::noSubselectionAllowedMessage($node->name->value, $type->toString()), [$node->selectionSet] )); } } elseif ($node->selectionSet === null) { $context->reportError(new Error( static::requiredSubselectionMessage($node->name->value, $type->toString()), [$node] )); } }, ]; } public static function noSubselectionAllowedMessage(string $field, string $type): string { return "Field \"{$field}\" of type \"{$type}\" must not have a sub selection."; } public static function requiredSubselectionMessage(string $field, string $type): string { return "Field \"{$field}\" of type \"{$type}\" must have a sub selection."; } }