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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def export_chat_invite_link( self, chat_id: Union[int, str] ) -> str: """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. """

        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