Stuck in transformExcelToLucky() when processing Excel files containing images from Node server

[Akash0463]

When attempting to process Excel files containing images using the transformExcelToLucky() function from the Node server, the operation gets stuck and does not complete. This issue seems to be specific to Excel files that include images as part of their content.

node version - 14.19.1
luckyexcel - 1.0.1

seems to be the issue in generateRandomIndex() -> var userAgent = window.navigator.userAgent.replace(/[^a-zA-Z0-9]/g, "").split("");

window object will not be available in case of server call

function generateRandomIndex(prefix) {
    if (prefix == null) {
        prefix = "Sheet";
    }
   // window object will not be available in case of server call
    var userAgent = window.navigator.userAgent.replace(/[^a-zA-Z0-9]/g, "").split("");
    var mid = "";
    for (var i = 0; i < 5; i++) {
        mid += userAgent[Math.round(Math.random() * (userAgent.length - 1))];
    }
    var time = new Date().getTime();
    return prefix + "_" + mid + "_" + time;
}