create a file download in the client side code example

Example 1: typescript create file and download

var fileContents = "Hello world!";
var filename = "hello.txt";
var filetype = "text/plain";

var a = document.createElement("a");
dataURI = "data:" + filetype +
    ";base64," + btoa(fileContents);
a.href = dataURI;
a['download'] = filename;
var e = document.createEvent("MouseEvents");
// Use of deprecated function to satisfy TypeScript.
e.initMouseEvent("click", true, false,
    document.defaultView, 0, 0, 0, 0, 0,
    false, false, false, false, 0, null);
a.dispatchEvent(e);
a.removeNode();

Example 2: how to set a var in js to be a download

var textToSave = 'this is a test';

var hiddenElement = document.createElement('a');

hiddenElement.href = 'data:attachment/text,' + encodeURI(textToSave);
hiddenElement.target = '_blank';
hiddenElement.download = 'myFile.txt';
hiddenElement.click();