code: function buildImp(bid) {
    const sizes = bid.sizes;
    const imp = {
      'id': bid.bidId,
      'tagid': bid.placementCode
    };
  
    if (bid.mediaType === 'video') {
      imp.video = {w: sizes[0], h: sizes[1]};
      if (bid.params.video) {
        Object.keys(bid.params.video)
          .filter(param => includes(VIDEO_TARGETING, param))
          .forEach(param => imp.video[param] = bid.params.video[param]);
      }
    } else {
      imp.banner = {
        format: sizes.map(s => ({'w': s[0], 'h': s[1]})),
        topframe: 0
      };
    }
    if (utils.getTopWindowLocation().protocol === 'https:') {
      imp.secure = 1;
    }
    return imp;
  }
docs: Builds parameters object for single impression