session-desktop/ts/session/messages/outgoing/DataMessage.ts

import { SignalService } from '../../../protobuf';
import { ExpirableMessage } from './ExpirableMessage';

export abstract class DataMessage extends ExpirableMessage {
  public contentProto(): SignalService.Content {
    return new SignalService.Content({
      ...super.contentProto(),
      dataMessage: this.dataProto(),
    });
  }

  public dataProto(): SignalService.DataMessage {
    return super.dataProto();
  }
}