How to use the botframework-schema.ActivityTypes.ConversationUpdate function in botframework-schema

} else {
					await dc.context.sendActivity(`Nothing to cancel.`);
				}
			}

			if (!dc.context.responded) {
				// Continue the current dialog if one is pending.
				await dc.continueDialog();
			}

			if (!dc.context.responded) {
				// If no response has been sent, start the onboarding dialog.
				await dc.beginDialog('root');
			}
		} else if (
			turnContext.activity.type === ActivityTypes.ConversationUpdate &&
			turnContext.activity.membersAdded[0].name !== 'Bot'
		) {
			// Send a "this is what the bot does" message.
			const description = [
				'This is a bot that demonstrates an alternate dialog system',
				'which uses a slot filling technique to collect multiple responses from a user.',
				'Say anything to continue.'
			];
			await turnContext.sendActivity(description.join(' '));
		}

		await this.conversationState.saveChanges(turnContext);
	}
}

recipient: parserModel.recipient,
          conversationId: parserModel.conversation.id
        });
        currentActivity.text = '';
      }
      aggregate = aggregate.substr(result.index);
      if (type === ActivityTypes.Typing) {
        let newActivity = createActivity({
          type,
          recipient: parserModel.recipient,
          from: parserModel.from,
          conversationId: parserModel.conversation.id
        });
        newActivity.timestamp = getIncrementedDate(100);
        newActivities.push(newActivity);
      } else if (type === ActivityTypes.ConversationUpdate) {
        processConversationUpdate(parserModel, newActivities, unparsedSource);
      }
    } else if (instruction && instruction === Instructions.Delay) {
      delay = ~~rest;
    } else if (field) {
      // As more activity fields are supported,
      // this should become a util or helper class.
      switch (field) {
        case ActivityFields.Attachment:
          await addAttachmentToActivity(currentActivity, unparsedSource);
          break;

        case ActivityFields.AttachmentLayout:
          addAttachmentLayout(currentActivity, unparsedSource as AttachmentLayoutTypes);
          break;

function createConversationUpdate(parserModel: TransientParserModel, membersAdded?: ChannelAccount[], membersRemoved?: ChannelAccount[]) {
  let conversationUpdateActivity = createActivity({
    type: ActivityTypes.ConversationUpdate,
    recipient: parserModel.accounts.bot,
    conversationId: parserModel.conversation.id
  });
  conversationUpdateActivity.membersAdded = membersAdded || [];
  conversationUpdateActivity.membersRemoved = membersRemoved || [];
  conversationUpdateActivity.timestamp = getIncrementedDate(100);
  return conversationUpdateActivity;
}