Add WindowOrWorkerGlobalScope

Additionally, this fixes the following:

* IDBEnvironment removed because it's officially obsolete and "although
  it may still work in some browsers, its use is discouraged since it
  could be removed at any time".

* indexedDB now wrapped in js.UndefOr because it's not always available

* indexedDB added to WorkerGlobalScope

* caches return type changed from js.Any to js.UndefOr[CacheStorage]

* caches added to Window

* CacheStorage moved into experiment.cachestorage as it's available from
  Window too

* Add missing methods to window and web-worker scopes:
  * crossOriginIsolated
  * isSecureContext
  * origin

Ref: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope

Author: japgolly

src/main/scala/org/scalajs/dom/experimental/cachestorage/CacheStorage.scala

@@ -0,0 +1,69 @@
+package org.scalajs.dom.experimental.cachestorage
+
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+import org.scalajs.dom.experimental._
+
+/**
+ * See [[https://slightlyoff.github.io/ServiceWorker/spec/service_worker_1/#cache ¶5.4 cache]]
+ * of ServiceWorker whatwg spec.
+ */
+@js.native
+trait CacheQueryOptions extends js.Object {
+  var ignoreSearch: Boolean = js.native // false
+
+  var ignoreMethod: Boolean = js.native // false
+
+  var ignoreVary: Boolean = js.native //false
+
+  var cacheName: String = js.native
+}
+
+/**
+ * See [[https://slightlyoff.github.io/ServiceWorker/spec/service_worker_1/#cache-storage ¶5.5 cache]]
+ * of ServiceWorker whatwg spec.
+ */
+@js.native
+trait CacheStorage extends js.Object {
+  def `match`(request: RequestInfo,
+      options: CacheQueryOptions = js.native): js.Promise[js.Any] = js.native
+
+  def has(cacheName: String): js.Promise[Boolean] = js.native
+
+  def open(cacheName: String): js.Promise[Cache] = js.native
+
+  def delete(cacheName: String): js.Promise[Boolean] = js.native
+
+  def keys(): js.Promise[js.Array[String]] = js.native
+}
+
+/**
+ * See [[https://slightlyoff.github.io/ServiceWorker/spec/service_worker_1/#cache ¶5.4 cache]]
+ * of ServiceWorker whatwg spec.
+ */
+@js.native
+@JSGlobal
+abstract class Cache extends js.Object {
+  def `match`(request: RequestInfo,
+      options: js.UndefOr[
+          CacheQueryOptions] = js.native): js.Promise[js.UndefOr[Response]] = js.native
+
+  def matchAll(request: RequestInfo = js.native,
+      options: js.UndefOr[
+          CacheQueryOptions] = js.native): js.Promise[js.Array[Response]] = js.native
+
+  def add(request: RequestInfo): js.Promise[Unit] = js.native
+
+  def addAll(requests: js.Array[RequestInfo]): js.Promise[Unit] = js.native
+
+  def put(request: RequestInfo,
+      response: Response): js.Promise[Unit] = js.native
+
+  def delete(request: RequestInfo,
+      options: js.UndefOr[
+          CacheQueryOptions] = js.native): js.Promise[Boolean] = js.native
+
+  def keys(request: js.UndefOr[RequestInfo] = js.native,
+      options: js.UndefOr[
+          CacheQueryOptions] = js.native): js.Promise[js.Array[Request]]
+}

src/main/scala/org/scalajs/dom/experimental/serviceworkers/ServiceWorkers.scala

@@ -7,10 +7,10 @@ import scala.scalajs.js.|
 import org.scalajs.dom.experimental.{
   Notification, NotificationOptions, Request, RequestInfo, Response, Sequence
 }
-import org.scalajs.dom.raw.{WorkerGlobalScope, ErrorEvent}
+import org.scalajs.dom.experimental.cachestorage._
+import org.scalajs.dom.raw.{ErrorEvent, EventInit, WorkerGlobalScope}
 import org.scalajs.dom.webgl.RenderingContext
 import org.scalajs.dom.{Event, EventTarget, MessageEvent, MessagePort}
-import org.scalajs.dom.raw.EventInit
 
 @js.native
 sealed trait FrameType extends js.Any
@@ -608,70 +608,6 @@ trait Clients extends js.Object {
   def claim(): js.Promise[Unit] = js.native
 }
 
-/**
- * See [[https://slightlyoff.github.io/ServiceWorker/spec/service_worker_1/#cache ¶5.4 cache]]
- * of ServiceWorker whatwg spec.
- */
-@js.native
-@JSGlobal
-abstract class Cache extends js.Object {
-  def `match`(request: RequestInfo,
-      options: js.UndefOr[
-          CacheQueryOptions] = js.native): js.Promise[js.UndefOr[Response]] = js.native
-
-  def matchAll(request: RequestInfo = js.native,
-      options: js.UndefOr[
-          CacheQueryOptions] = js.native): js.Promise[js.Array[Response]] = js.native
-
-  def add(request: RequestInfo): js.Promise[Unit] = js.native
-
-  def addAll(requests: js.Array[RequestInfo]): js.Promise[Unit] = js.native
-
-  def put(request: RequestInfo,
-      response: Response): js.Promise[Unit] = js.native
-
-  def delete(request: RequestInfo,
-      options: js.UndefOr[
-          CacheQueryOptions] = js.native): js.Promise[Boolean] = js.native
-
-  def keys(request: js.UndefOr[RequestInfo] = js.native,
-      options: js.UndefOr[
-          CacheQueryOptions] = js.native): js.Promise[js.Array[Request]]
-}
-
-/**
- * See [[https://slightlyoff.github.io/ServiceWorker/spec/service_worker_1/#cache ¶5.4 cache]]
- * of ServiceWorker whatwg spec.
- */
-@js.native
-trait CacheQueryOptions extends js.Object {
-  var ignoreSearch: Boolean = js.native // false
-
-  var ignoreMethod: Boolean = js.native // false
-
-  var ignoreVary: Boolean = js.native //false
-
-  var cacheName: String = js.native
-}
-
-/**
- * See [[https://slightlyoff.github.io/ServiceWorker/spec/service_worker_1/#cache-storage ¶5.5 cache]]
- * of ServiceWorker whatwg spec.
- */
-@js.native
-trait CacheStorage extends js.Object {
-  def `match`(request: RequestInfo,
-      options: CacheQueryOptions = js.native): js.Promise[js.Any] = js.native
-
-  def has(cacheName: String): js.Promise[Boolean] = js.native
-
-  def open(cacheName: String): js.Promise[Cache] = js.native
-
-  def delete(cacheName: String): js.Promise[Boolean] = js.native
-
-  def keys(): js.Promise[js.Array[String]] = js.native
-}
-
 /**
  * The ServiceWorkerGlobalScope interface of the ServiceWorker API represents
  * the global execution context of a service worker.
@@ -694,13 +630,6 @@ trait CacheStorage extends js.Object {
 @js.native
 trait ServiceWorkerGlobalScope extends WorkerGlobalScope {
 
-  /**
-   * Returns the CacheStorage object associated with the service worker.
-   *
-   * MDN
-   */
-  override def caches: CacheStorage = js.native
-
   /**
    * Returns the Clients object associated with the service worker.
    *

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

@@ -8,7 +8,6 @@ object idb {
   @inline def Cursor = raw.IDBCursor
   type CursorWithValue = raw.IDBCursorWithValue
   type Database = raw.IDBDatabase
-  type Environment = raw.IDBEnvironment
   type Factory = raw.IDBFactory
   type Index = raw.IDBIndex
   type KeyRange = raw.IDBKeyRange

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

@@ -356,25 +356,6 @@ class IDBCursorWithValue extends IDBCursor {
   def value: js.Any = js.native
 }
 
-/**
- * The IDBEvironment interface of the IndexedDB API provides asynchronous access
- * to a client-side database. It is implemented by window and Worker objects.
- *
- * MDN
- */
-@js.native
-trait IDBEnvironment extends js.Object {
-
-  /**
-   * an IDBRequest object that communicates back to the requesting application
-   * through events. This design means that any number of requests can be active on any
-   * database at a time.
-   *
-   * MDN
-   */
-  def indexedDB: IDBFactory = js.native
-}
-
 /**
  * The IDBKeyRange interface of the IndexedDB API represents a continuous interval
  * over some data type that is used for keys. Records can be retrieved from object

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

@@ -107,17 +107,7 @@ class Worker(stringUrl: String) extends AbstractWorker {
  * MDN
  */
 @js.native
-trait WorkerGlobalScope extends EventTarget {
-
-  /**
-   * The caches read-only property of the WorkerGlobalScope interface returns
-   * the CacheStorage object associated with the current worker context.
-   * This object enables service worker functionality such as storing assets
-   * for offline use, and generating custom responses to requests.
-   *
-   * MDN
-   */
-  def caches: js.Any = js.native
+trait WorkerGlobalScope extends EventTarget with WindowOrWorkerGlobalScope {
 
   /**
    * The self read-only property of the WorkerGlobalScope interface returns a

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

@@ -0,0 +1,57 @@
+package org.scalajs.dom.raw
+
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+import org.scalajs.dom.experimental.cachestorage.CacheStorage
+
+/**
+ * The WindowOrWorkerGlobalScope mixin describes several features common to the
+ * Window and WorkerGlobalScope interfaces.
+ *
+ * Note: WindowOrWorkerGlobalScope is a mixin and not an interface; you can't
+ * actually create an object of type WindowOrWorkerGlobalScope.
+ *
+ * MDN
+ */
+@js.native
+trait WindowOrWorkerGlobalScope extends js.Object {
+
+  /**
+   * Returns the CacheStorage object associated with the current context.
+   * This object enables functionality such as storing assets for offline use,
+   * and generating custom responses to requests.
+   *
+   * MDN
+   */
+  def caches: js.UndefOr[CacheStorage] = js.native
+
+  /**
+   * Returns a boolean value that indicates whether a SharedArrayBuffer can be
+   * sent via a Window.postMessage() call.
+   *
+   * MDN
+   */
+  def crossOriginIsolated: Boolean = js.native
+
+  /**
+   * Provides a mechanism for applications to asynchronously access
+   * capabilities of indexed databases.
+   *
+   * MDN
+   */
+  def indexedDB: js.UndefOr[IDBFactory] = js.native
+
+  /**
+   * Returns a boolean indicating whether the current context is secure or not.
+   *
+   * MDN
+   */
+  def isSecureContext: Boolean = js.native
+
+  /**
+   * Returns the origin of the global scope, serialized as a string.
+   *
+   * MDN
+   */
+  def origin: String = js.native //should be USVString
+}

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

@@ -2083,7 +2083,7 @@ trait WindowSessionStorage extends js.Object {
 @JSGlobal
 class Window
     extends EventTarget with WindowLocalStorage with WindowSessionStorage
-    with WindowTimers with WindowBase64 with IDBEnvironment
+    with WindowTimers with WindowBase64 with WindowOrWorkerGlobalScope
     with WindowConsole {
   var ondragend: js.Function1[DragEvent, _] = js.native