code: def _preview_merge_header(merge, preview_only):
      target_dir_desc = cmd_impl_support.cwd_desc(merge.target_dir)
      if preview_only:
          cli.out(
              f"Merge will copy files from the following run to {target_dir_desc}:",
              err=True,
          )
      else:
          cli.out(
              f"You are about to copy files from the following run to {target_dir_desc}:",
              err=True,
          )
  
imports: import os
  from guild import cli
  from guild import cmd_impl_support
  from guild import config
  from guild import exit_code
  from guild import run_merge
  from guild import run_util
  from guild import util
  from guild import vcs_util
  from .None import runs_impl
label_desc: Use image node_id 24 for calling a global function with example usage: _preview_merge_header(merge, preview_only) without return types