Issue in Internet explorer for drag and drop file upload.

[dhruvalshah07]

Hello,
I have used this plugin in my website, and I got issue in drag and drop functionality for Internet explorer. It's working fine in other browser i.e. chrome, firefox, Edge.
I found issue is because of 'jquery.fileupload.js' file's below code

    _isXHRUpload: function (options) {
        var undef = 'undefined';
        return !options.forceIframeTransport &&
            typeof XMLHttpRequestUpload !== undef && typeof File !== undef &&
            (!options.multipart || typeof FormData !== undef);
    },

=> "typeof XMLHttpRequestUpload !== undef " when I removed this code then it worked fine for me.
Can anyone suggest what's the use of this code?