code: def start(args):
      """Start S3 sync service.
  
      The S3 sync service synchronizes runs with S3 location
      `URI`. `URI` must be in the format ``s3://BUCKET[/PATH]`` where
      ``BUCKET`` is a writable S3 bucket and ``PATH`` is an optional
      path within the bucket.
  
      Credentials must be provided using ``AWS_ACCESS_KEY_ID`` and
      ``AWS_SECRET_ACCESS_KEY`` environment variables.
  
      The bucket region may be specified using `--region` or using
      ``AWS_DEFAULT_REGION`` environment variable.
  
      """
      from . import s3_sync_impl
  
      s3_sync_impl.start(args)
  
imports: import click
  from guild import click_util
label_desc: Use image node_id 2 for calling a global function with example usage: start(args) without return types