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listen example

        return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->close(...\func_get_args());
    }

    public function pclose(): bool
    {
        return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->pclose(...\func_get_args());
    }

    public function listen($callback): bool
    {
        return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->listen(...\func_get_args());
    }

    public function onFlushed($callback): bool
    {
        return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->onFlushed(...\func_get_args());
    }

    public function onInvalidated($callback, $pattern = null): bool
    {
        return ($this->lazyObjectState->realInstance ??= ($this->lazyObjectState->initializer)())->onInvalidated(...\func_get_args());
    }

throw new InvalidArgumentException(sprintf('Unsupported format "%s".', $format));
        }

        $errorIo = $io->getErrorStyle();
        $errorIo->title('Symfony Var Dumper Server');

        $this->server->start();

        $errorIo->success(sprintf('Server listening on %s', $this->server->getHost()));
        $errorIo->comment('Quit the server with CONTROL-C.');

        $this->server->listen(function DData $data, array $context, int $clientId) use ($descriptor, $io) {
            $descriptor->describe($io, $data, $context, $clientId);
        });

        return 0;
    }

    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
    {
        if ($input->mustSuggestOptionValuesFor('format')) {
            $suggestions->suggestValues($this->getAvailableFormats());
        }
    }

VarDumper::setHandler(function D$var) use ($cloner, $dumper) {
    $data = $cloner->cloneVar($var)->withRefHandles(false);
    $dumper->dump($data);
});

$server = new DumpServer(getenv('VAR_DUMPER_SERVER'));

$server->start();

echo "READY\n";

$server->listen(function DData $data, array $context, $clientId) {
    dump((string) $data, $context, $clientId);

    exit(0);
});