function addBlobToZipMultipleTimes(blob, times) {
    
    console.log("Input blob.size: ", formatBytes(blob.size));

    const zip = new JSZip();
    
    for(let i = 0; i < times; i++) {
        zip.file("file_" + i, blob);
    }
    
    console.log("generateAsync...");
    console.time("generateAsync");
    zip.generateAsync({type:"blob"})
        .then(function(blob) {
            console.timeEnd("generateAsync");
            console.log("Result zip.size: ", formatBytes(blob.size));
            
            // downloadBlob(blob); // some work with the result zip
        });
}

// https://stackoverflow.com/a/18650828/11468937
function formatBytes(bytes, decimals = 2) {
    if (bytes === 0) return '0 Bytes';

    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

    const i = Math.floor(Math.log(bytes) / Math.log(k));

    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}