static createItem(scriptId, wasteData) {
    const wastedRatio = (wasteData.unusedLength / wasteData.contentLength) || 0;
    const wastedBytes = Math.round(wasteData.contentLength * wastedRatio);

    return {
      scriptId,
      totalBytes: wasteData.contentLength,
      wastedBytes,
      wastedPercent: 100 * wastedRatio,
    };
  }
@param {string} scriptId
@param {WasteData} wasteData
@return {Summary}