code: def _preview_merge(merge, preview_only):
      _preview_merge_header(merge, preview_only)
      _preview_merge_run(merge)
      _preview_merge_copy_files(merge)
      _preview_merge_skipped_files(merge, preview_only)
  
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 23 for calling a global function with example usage: _preview_merge(merge, preview_only) without return types