Event emitter so focus goes back to modal trigger on close (MJS-4011)

focusBacktoTrigger.js

// Sample of opening the cart via componentEvents.emitEvent. 
// NOTE: openerElement needs to be populated with an actual DOM Node
// or jQuery object and not just a selector.

// In this instance, test is the trigger element with the ID flyout-test.
const test = document.getElementById('flyout-test')

// Event emitter
componentEvents.emitEvent('open-cart-flyout', [{
 openerElement: test
}]);