Add Worklet and AudioWorklet.

dom/src/main/scala/org/scalajs/dom/AudioWorklet.scala

@@ -0,0 +1,15 @@
+/** Documentation is thanks to Mozilla Contributors at https://developer.mozilla.org/en-US/docs/Web/API and available
+  * under the Creative Commons Attribution-ShareAlike v2.5 or later. http://creativecommons.org/licenses/by-sa/2.5/
+  *
+  * Everything else is under the MIT License http://opensource.org/licenses/MIT
+  */
+
+package org.scalajs.dom
+
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+
+@JSGlobal
+@js.native
+abstract class AudioWorklet extends Worklet {
+}

dom/src/main/scala/org/scalajs/dom/AudioWorkletNode.scala

@@ -11,7 +11,8 @@ import scala.scalajs.js.annotation._
 
 @JSGlobal
 @js.native
-abstract class AudioWorkletNode(context: BaseAudioContext, name: String, options: AudioWorkletNodeOptions = js.native) extends AudioNode {
+abstract class AudioWorkletNode(context: BaseAudioContext, name: String, options: AudioWorkletNodeOptions = js.native)
+    extends AudioNode {
 
-  def port: MessagePort
+  val port: MessagePort = js.native
 }

dom/src/main/scala/org/scalajs/dom/AudioWorkletNodeOptions.scala

@@ -12,6 +12,7 @@ trait AudioWorkletNodeOptions extends js.Any {
 
   /** The value to initialize the [[AudioNode#numberOfInputs]] property. Defaults to 1. */
   var numberOfInputs: js.UndefOr[Int] = js.undefined
+
   /** The value to initialize the [[AudioNode#numberOfOutputs]] property. Defaults to 1. */
   var numberOfOutputs: js.UndefOr[Int] = js.undefined
   var outputChannelCount: js.UndefOr[js.Array[Int]] = js.undefined

dom/src/main/scala/org/scalajs/dom/AudioWorkletProcessor.scala

@@ -16,7 +16,7 @@ abstract class AudioWorkletProcessor(options: AudioWorkletProcessorOptions) exte
   /** The [[MessagePort]] object that is connecting the [[AudioWorkletProcessor]] and the associated
     * [[AudioWorkletNode]].
     */
-  def port: MessagePort = js.native
+  val port: MessagePort = js.native
 
   def process(inputs: js.typedarray.Float32Array, outputs: js.typedarray.Float32Array, parameters: js.Object): Boolean
 

dom/src/main/scala/org/scalajs/dom/BaseAudioContext.scala

@@ -34,6 +34,11 @@ trait BaseAudioContext extends EventTarget {
     */
   val sampleRate: Double = js.native
 
+  /** Returns an instance of [[AudioWorklet]] that can be used for adding [[AudioWorketProcessor]]-derived classes which
+    * implement custom audio processing.
+    */
+  val audioWorklet: AudioWorklet = js.native
+
   /** Returns the current state of the AudioContext. */
   def state: String = js.native
 

dom/src/main/scala/org/scalajs/dom/Worklet.scala

@@ -0,0 +1,16 @@
+/** Documentation is thanks to Mozilla Contributors at https://developer.mozilla.org/en-US/docs/Web/API and available
+  * under the Creative Commons Attribution-ShareAlike v2.5 or later. http://creativecommons.org/licenses/by-sa/2.5/
+  *
+  * Everything else is under the MIT License http://opensource.org/licenses/MIT
+  */
+
+package org.scalajs.dom
+
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+
+@JSGlobal
+@js.native
+abstract class Worklet extends js.Object {
+  def addModule(moduleURL: String, options: WorkletOptions = js.native): js.Promise[Unit] = js.native
+}

dom/src/main/scala/org/scalajs/dom/WorkletOptions.scala

@@ -0,0 +1,13 @@
+/** Documentation is thanks to Mozilla Contributors at https://developer.mozilla.org/en-US/docs/Web/API and available
+  * under the Creative Commons Attribution-ShareAlike v2.5 or later. http://creativecommons.org/licenses/by-sa/2.5/
+  *
+  * Everything else is under the MIT License http://opensource.org/licenses/MIT
+  */
+
+package org.scalajs.dom
+
+import scala.scalajs.js
+
+trait WorkletOptions extends js.Any {
+  var credentials: js.UndefOr[RequestCredentials] = js.undefined
+}