Download multiple csv files in one zip folder using jsZIP in angular

gistfile1.ts

Below is code in which i am creating data for csv file and downloading csv file in zip folder:

``````````````````
generateCSVfiles()
{

      this.service.getStudentDetails(studentid, student.name).subscribe
          (res => {
            var dataSet = (res);
            // start
            if (studentid == "Senior") {
             
              const header = ["studentId","StudentName"];
              const replacer = (key, values) => values === null ? '' : values // specify how you want to handle null values here
              this.seniordata = items.map(row => header.map(fieldName => JSON.stringify(row[fieldName], replacer)).join(','))
              this.seniordata.unshift(header.join(','));
              this.seniordata = this.seniordata.join('\r\n');
            }
            else if (studentid == "Junior") {
               const header = ["studentId","StudentName"];
              const replacer = (key, values) => values === null ? '' : values // specify how you want to handle null values here
              this.juniordata = items.map(row => header.map(fieldName => JSON.stringify(row[fieldName], replacer)).join(','))
              this.juniordata.unshift(header.join(','));
              this.juniordata = this.juniordata.join('\r\n');
               
            }
        this.downloadzip();
   }
}
   





public downloadzip()
{
	
	 let zip = new JSZip();
      // Fill CSV variable
      zip.file( 'Studentrecord'+'.csv', this.juniordata);
	  zip.file( 'Studentrecord'+'.csv', this.seniordata);
    
    zip.generateAsync({
      type: "base64"
    }).then(function (content) {
      window.location.href = "data:application/zip;base64," + content ;
    });

}
`````````````````````
Above code working fine and able to download csv file inside zip folder when we got response data for one of junior or Senior student. but when we received both junior and senior data at time then it downloading different zip file or sometimes only one zip file getting generated. but i want both file in one zip folder. can someone guide me how to download different csv file in one zip folder.