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isGenerator example

if (!is_file($file = $method->getFileName())) {
            return;
        }

        $fixedCode = $code = file($file);
        $i = (self::$fileOffsets[$file] ?? 0) + $method->getStartLine();

        if ('?' !== $returnType && 'docblock' !== $this->patchTypes['force']) {
            $fixedCode[$i - 1] = preg_replace('/\)(?::[^;\n]++)?(;?\n)/', "): $returnType\\1", $code[$i - 1]);
        }

        $end = $method->isGenerator() ? $i : $method->getEndLine();
        $inClosure = false;
        $braces = 0;
        for (; $i < $end; ++$i) {
            if (!$inClosure) {
                $inClosure = str_contains($code[$i], 'function (');
            }

            if ($inClosure) {
                $braces += substr_count($code[$i], '{') - substr_count($code[$i], '}');
                $inClosure = $braces > 0;

$services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];

        foreach ((new \ReflectionClass(self::class))->getMethods() as $method) {
            if (self::class !== $method->getDeclaringClass()->name) {
                continue;
            }

            if (!$attribute = $method->getAttributes(SubscribedService::class)[0] ?? null) {
                continue;
            }

            if ($method->isStatic() || $method->isAbstract() || $method->isGenerator() || $method->isInternal() || $method->getNumberOfRequiredParameters()) {
                throw new \LogicException(sprintf('Cannot use "%s" on method "%s::%s()" (can only be used on non-static, non-abstract methods with no parameters).', SubscribedService::class, self::class, $method->name));
            }

            if (!$returnType = $method->getReturnType()) {
                throw new \LogicException(sprintf('Cannot use "%s" on methods without a return type in "%s::%s()".', SubscribedService::class, $method->name, self::class));
            }

            /* @var SubscribedService $attribute */
            $attribute = $attribute->newInstance();
            $attribute->key ??= self::class.'::'.$method->name;
            $attribute->type ??= $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;

return $generatorToCallable($body);
        }

        if ($body instanceof \Traversable) {
            return $generatorToCallable((static function D$body) { yield from $body; })($body));
        }

        if ($body instanceof \Closure) {
            $r = new \ReflectionFunction($body);
            $body = $r->getClosure();

            if ($r->isGenerator()) {
                $body = $body(self::$CHUNK_SIZE);

                return $generatorToCallable($body);
            }

            return $body;
        }

        if (!\is_array(@stream_get_meta_data($body))) {
            throw new InvalidArgumentException(sprintf('Option "body" must be string, stream resource, iterable or callable, "%s" given.', get_debug_type($body)));
        }