Sourceror.append_comments

You're seeing just the function append_comments, go back to Sourceror module for more information.
Link to this function

append_comments(quoted, comments, position \\ :leading)

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Specs

append_comments(
  quoted :: Macro.t(),
  comments :: [comment()],
  position :: :leading | :trailing
) :: Macro.t()

Appends comments to the leading or trailing comments of a node.