### triggerEvent

Triggers a specific event on a given element, optionally passing custom data.

Use `new CustomEvent()` to create an event from the specified `eventType` and details.
Use `el.dispatchEvent()` to trigger the newly created event on the given element.
Omit the third argument, `detail`, if you do not want to pass custom data to the triggered event.

```js
const triggerEvent = (el, eventType, detail = undefined) =>
  el.dispatchEvent(new CustomEvent(eventType, { detail: detail }));
```

```js
triggerEvent(document.getElementById('myId'), 'click');
triggerEvent(document.getElementById('myId'), 'click', { username: 'bob' });
```