src/Type/Definition/EnumType.php
public function serialize($value)
    {
        $lookup = $this->getValueLookup();
        if (isset($lookup[$value])) {
            return $lookup[$value]->name;
        }

        throw new Error('Cannot serialize value as enum: ' . Utils::printSafe($value));
    }
public function serialize($value)
    {
        $lookup = $this->getValueLookup();
        if (isset($lookup[$value])) {
            return $lookup[$value]->name;
        }

        throw new Error('Cannot serialize value as enum: ' . Utils::printSafe($value));
    }
@param mixed $value

@return mixed

@throws Error