file-download.js

module.exports = function(data, filename, mime) {
    var blob = new Blob([data], {type: mime || 'application/octet-stream'});
    if (typeof window.navigator.msSaveBlob !== 'undefined') {
        // IE workaround for "HTML7007: One or more blob URLs were 
        // revoked by closing the blob for which they were created. 
        // These URLs will no longer resolve as the data backing 
        // the URL has been freed."
        window.navigator.msSaveBlob(blob, filename);
    }
    else {
        var blobURL = window.URL.createObjectURL(blob);
        var tempLink = document.createElement('a');
        tempLink.style.display = 'none';
        tempLink.href = blobURL;
        tempLink.setAttribute('download', filename); 
        
        // Safari thinks _blank anchor are pop ups. We only want to set _blank
        // target if the browser does not support the HTML5 download attribute.
        // This allows you to download files in desktop safari if pop up blocking 
        // is enabled.
        if (typeof tempLink.download === 'undefined') {
            tempLink.setAttribute('target', '_blank');
        }
        
        document.body.appendChild(tempLink);
        tempLink.click();
        document.body.removeChild(tempLink);
        window.URL.revokeObjectURL(blobURL);
    }
}