code: def fetchThreadList(
          self, offset=None, limit=20, thread_location=ThreadLocation.INBOX, before=None
      ):
          
          if offset is not None:
              log.warning(
                  "Using `offset` in `fetchThreadList` is no longer supported, "
                  "since Facebook migrated to the use of GraphQL in this request. "
                  "Use `before` instead."
              )
  
          if limit > 20 or limit < 1:
              raise FBchatUserError("`limit` should be between 1 and 20")
  
          if thread_location in ThreadLocation:
              loc_str = thread_location.value
          else:
              raise FBchatUserError('"thread_location" must be a value of ThreadLocation')
  
          params = {
              "limit": limit,
              "tags": [loc_str],
              "before": before,
              "includeDeliveryReceipts": True,
              "includeSeqID": False,
          }
          j = self.graphql_request(GraphQL(doc_id="1349387578499440", params=params))
  
          rtn = []
          for node in j["viewer"]["message_threads"]["nodes"]:
              _type = node.get("thread_type")
              if _type == "GROUP":
                  rtn.append(Group._from_graphql(node))
              elif _type == "ONE_TO_ONE":
                  rtn.append(User._from_thread_fetch(node))
              else:
                  raise FBchatException(
                      "Unknown thread type: {}, with data: {}".format(_type, node)
                  )
          return rtn
docs: Get thread list of your facebook account
  
          :param offset: Deprecated. Do not use!
          :param limit: Max. number of threads to retrieve. Capped at 20
          :param thread_location: models.ThreadLocation: INBOX, PENDING, ARCHIVED or OTHER
          :param before: A timestamp (in milliseconds), indicating from which point to retrieve threads
          :type limit: int
          :type before: int
          :return: :class:`models.Thread` objects
          :rtype: list
          :raises: FBchatException if request failed