找到了答案：

var zip = new admZip(data);
var newZip = new admZip();

      zip.getEntries().forEach((zipEntry, i) => {
        const entryData = zipEntry.getData()
        
        var newFileName = cart[i]. '.pdf'
    
        newZip.addFile(newFileName, entryData);
      });

      return new StreamableFile(newZip.toBuffer());