src/Type/Schema.php
private function loadType($typeName)
    {
        $typeLoader = $this->config->typeLoader;

        if (! $typeLoader) {
            return $this->defaultTypeLoader($typeName);
        }

        $type = $typeLoader($typeName);

        if (! $type instanceof Type) {
            throw new InvariantViolation(
                sprintf(
                    'Type loader is expected to return valid type "%s", but it returned %s',
                    $typeName,
                    Utils::printSafe($type)
                )
            );
        }
        if ($type->name !== $typeName) {
            throw new InvariantViolation(
                sprintf('Type loader is expected to return type "%s", but it returned "%s"', $typeName, $type->name)
            );
        }

        return $type;
    }
private function loadType($typeName)
    {
        $typeLoader = $this->config->typeLoader;

        if (! $typeLoader) {
            return $this->defaultTypeLoader($typeName);
        }

        $type = $typeLoader($typeName);

        if (! $type instanceof Type) {
            throw new InvariantViolation(
                sprintf(
                    'Type loader is expected to return valid type "%s", but it returned %s',
                    $typeName,
                    Utils::printSafe($type)
                )
            );
        }
        if ($type->name !== $typeName) {
            throw new InvariantViolation(
                sprintf('Type loader is expected to return type "%s", but it returned "%s"', $typeName, $type->name)
            );
        }

        return $type;
    }
@param string $typeName

@return Type