code: def export_chat_invite_link(
          self,
          chat_id: Union[int, str]
      ) -> str:
          
          peer = self.resolve_peer(chat_id)
  
          if isinstance(peer, types.InputPeerChat):
              return self.send(
                  functions.messages.ExportChatInvite(
                      peer=peer.chat_id
                  )
              ).link
          elif isinstance(peer, types.InputPeerChannel):
              return self.send(
                  functions.channels.ExportInvite(
                      channel=peer
                  )
              ).link
docs: Use this method to generate a new invite link for a chat; any previously generated link is revoked.
  
          You must be an administrator in the chat for this to work and have the appropriate admin rights.
  
          Args:
              chat_id (``int`` | ``str``):
                  Unique identifier for the target chat or username of the target channel/supergroup
                  (in the format @username).
  
          Returns:
              On success, the exported invite link as string is returned.
  
          Raises:
              :class:`RPCError <pyrogram.RPCError>` in case of a Telegram RPC error.