Add duplex property for the Fetch API's Request type

Author: zetashift

api-reports/2_12.txt

@@ -16510,6 +16510,7 @@ Request[JC] def bodyUsed: Boolean
 Request[JC] def cache: RequestCache
 Request[JC] def credentials: RequestCredentials
 Request[JC] def destination: RequestDestination
+Request[JC] def duplex: RequestDuplex
 Request[JC] def formData(): js.Promise[FormData]
 Request[JC] def headers: Headers
 Request[JC] def integrity: String
@@ -16542,6 +16543,8 @@ RequestDestination[SO] val sharedworker: RequestDestination
 RequestDestination[SO] val subresource: RequestDestination
 RequestDestination[SO] val unknown: RequestDestination
 RequestDestination[SO] val worker: RequestDestination
+RequestDuplex[JT]
+RequestDuplex[SO] val half: RequestDuplex
 RequestInit[JT] var body: js.UndefOr[BodyInit]
 RequestInit[JT] var cache: js.UndefOr[RequestCache]
 RequestInit[JT] var credentials: js.UndefOr[RequestCredentials]

api-reports/2_13.txt

@@ -16510,6 +16510,7 @@ Request[JC] def bodyUsed: Boolean
 Request[JC] def cache: RequestCache
 Request[JC] def credentials: RequestCredentials
 Request[JC] def destination: RequestDestination
+Request[JC] def duplex: RequestDuplex
 Request[JC] def formData(): js.Promise[FormData]
 Request[JC] def headers: Headers
 Request[JC] def integrity: String
@@ -16542,6 +16543,8 @@ RequestDestination[SO] val sharedworker: RequestDestination
 RequestDestination[SO] val subresource: RequestDestination
 RequestDestination[SO] val unknown: RequestDestination
 RequestDestination[SO] val worker: RequestDestination
+RequestDuplex[JT]
+RequestDuplex[SO] val half: RequestDuplex
 RequestInit[JT] var body: js.UndefOr[BodyInit]
 RequestInit[JT] var cache: js.UndefOr[RequestCache]
 RequestInit[JT] var credentials: js.UndefOr[RequestCredentials]

dom/src/main/scala-2/org/scalajs/dom/RequestDuplex.scala

@@ -0,0 +1,13 @@
+package org.scalajs.dom
+
+import scala.scalajs.js
+
+/**
+  * Fetch APIs [[https://fetch.spec.whatwg.org/#dom-requestinit-duplex RequestDuplex enum]]
+  */
+@js.native
+sealed trait RequestDuplex extends js.Any
+
+object RequestDuplex {
+  val half: RequestDuplex = "half".asInstanceOf[RequestDuplex]
+}

dom/src/main/scala-3/org/scalajs/dom/RequestDuplex.scala

@@ -0,0 +1,12 @@
+package org.scalajs.dom
+
+import scala.scalajs.js
+
+/**
+  * Fetch APIs [[https://fetch.spec.whatwg.org/#dom-requestinit-duplex RequestDuplex enum]]
+  */
+opaque type RequestDuplex <: String = String
+
+object RequestDuplex {
+  val half: RequestDuplex = "half"
+}

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

@@ -47,4 +47,9 @@ class Request(input: RequestInfo, init: RequestInit = null) extends Body {
   def keepalive: Boolean = js.native
 
   def signal: AbortSignal = js.native
+
+  /** "half" is the only valid value and it is for initiating a half-duplex fetch (i.e., the user agent sends the entire
+    * request before processing the response).
+    */
+  def duplex: RequestDuplex = js.native
 }