hasFreeDeliveryItems example

public function match(RuleScope $scope): bool
    {
        if ($scope instanceof LineItemScope) {
            return $this->isFreeDeliveryItem($scope->getLineItem()) === $this->allowed;
        }

        if (!$scope instanceof CartRuleScope) {
            return false;
        }

        $hasFreeDeliveryItems = $this->hasFreeDeliveryItems($scope->getCart()->getLineItems());

        return $hasFreeDeliveryItems === $this->allowed;
    }

    public function getConstraints(): array
    {
        return [
            'allowed' => RuleConstraints::bool(),
        ];
    }