code: def compression(request):
      if request.param == "zstd":
          pytest.importorskip("zstandard")
      elif request.param:
          pytest.importorskip(request.param)
      return request.param
  
imports: from __future__ import annotations
  import threading
  import zlib
  from concurrent.futures import ThreadPoolExecutor
  import pytest
  import dask.config
  from distributed import Worker, wait
  from distributed.compatibility import LINUX
  from distributed.protocol import dumps, loads, maybe_compress, msgpack, to_serialize
  from distributed.protocol.compression import Compression, compressions, get_compression_settings
  from distributed.utils import nbytes
  from distributed.utils_test import gen_cluster
label_desc: Use image node_id 1 for calling a global function with example usage: compression(request) and returns: request