const { domEvent } = require('dom-event-simulate');
// input @
domEvent(element, 'keydown', {
  keyCode: 50,
  key: '@',
});
// start a drag
domEvent(dom, 'mousedown', {
  clientX: point.x,
  clientY: point.y,
});
domEvent(dom, 'mousemove', {
  clientX: point.x + 10,
  clientY: point.y + 10,
});
domEvent(dom, 'mouseup', {
  clientX: point.x + 10,
  clientY: point.y + 10,
});

var element = document.querySelector('#input');

element.addEventListener('change', function(e) {
  console.log(e.target.files);
}, false);

domEvent(element, 'change', {
  data: {
    target: {
      files: [
        {
          file: 'file1.png',
        },
        {
          file: 'file2.jpg',
        }
      ],
    },
  }
});

const { helper: eventHelper } = require('dom-event-simulate');

// Type content to input element.
eventHelper.elementInput

// Type content to a contentEditable element.
eventHelper.formInput