Add EventListenerOptions trait and implement it in addEventListener and removeEventListener

Create removeEventListener function which accepts an options object

Create companion object to EventListenerOptions with an initializer

Formatting fixes for scalafmt

Annotate companion instantiator with @inline

Indent lines to satisfy scalafmt

Author: busti

src/main/scala/org/scalajs/dom/raw/lib.scala

@@ -2693,8 +2693,65 @@ class Window
 }
 
 /**
- * EventTarget is a DOM interface implemented by objects that can receive DOM events
- * and have listeners for them.
+ * An options object that specifies characteristics about the event listener.
+ *
+ * MDN
+ */
+trait EventListenerOptions extends js.Object {
+
+  /**
+   * A Boolean indicating that events of this type
+   * will be dispatched to the registered listener
+   * before being dispatched to any EventTarget
+   * beneath it in the DOM tree.
+   *
+   * MDN
+   */
+  var capture: js.UndefOr[Boolean] = js.undefined
+
+  /**
+   * A Boolean indicating that the listener
+   * should be invoked at most once after being added.
+   * If true, the listener would be automatically removed when invoked.
+   */
+  var once: js.UndefOr[Boolean] = js.undefined
+
+  /**
+   * A Boolean which, if true, indicates
+   * that the function specified by listener
+   * will never call preventDefault().
+   * If a passive listener does call preventDefault(),
+   * the user agent will do nothing other
+   * than generate a console warning.
+   * See Improving scrolling performance with passive listeners to learn more.
+   *
+   * MDN
+   */
+  var passive: js.UndefOr[Boolean] = js.undefined
+}
+
+object EventListenerOptions {
+
+  /**
+   * Construct a new EventListenerOptions
+   */
+  @inline
+  def apply(capture: js.UndefOr[Boolean] = js.undefined,
+      once: js.UndefOr[Boolean] = js.undefined,
+      passive: js.UndefOr[Boolean] = js.undefined): EventListenerOptions = {
+    val result = js.Dynamic.literal()
+
+    capture.foreach(result.capture = _)
+    once.foreach(result.once = _)
+    passive.foreach(result.passive = _)
+
+    result.asInstanceOf[EventListenerOptions]
+  }
+}
+
+/**
+ * EventTarget is a DOM interface implemented by objects
+ * that can receive DOM events and have listeners for them.
  *
  * Element, document, and window are the most common event targets, but other
  * objects can be event targets too, for example XMLHttpRequest, AudioNode,
@@ -2731,6 +2788,34 @@ class EventTarget extends js.Object {
       listener: js.Function1[T, _],
       useCapture: Boolean = js.native): Unit = js.native
 
+  /**
+   * Removes the event listener previously registered with
+   * EventTarget.addEventListener.
+   *
+   * This implementation accepts a settings object of type EventListenerOptions.
+   *
+   * MDN
+   */
+  def removeEventListener[T <: Event](`type`: String,
+      listener: js.Function1[T, _],
+      options: EventListenerOptions): Unit = js.native
+
+  /**
+   * The EventTarget.addEventListener() method
+   * registers the specified listener
+   * on the EventTarget it's called on.
+   * The event target may be an Element in a document,
+   * the Document itself, a Window, or any other object that supports events
+   * (such as XMLHttpRequest).
+   *
+   * This implementation accepts a settings object of type EventListenerOptions.
+   *
+   * MDN
+   */
+  def addEventListener[T <: Event](`type`: String,
+      listener: js.Function1[T, _],
+      options: EventListenerOptions): Unit = js.native
+
   /**
    * Dispatches an Event at the specified EventTarget, invoking the affected
    * EventListeners in the appropriate order. The normal event processing rules