1 files changed, 13 insertions, 12 deletions

diff --git a/js/dom_types.ts b/js/dom_types.ts
index 817f91abf..7e4198506 100644
--- a/js/dom_types.ts
+++ b/js/dom_types.ts
@@ -254,6 +254,7 @@ export interface ReadableStream {
   readonly locked: boolean;
   cancel(): Promise<void>;
   getReader(): ReadableStreamReader;
+  tee(): [ReadableStream, ReadableStream];
 }
 
 export interface EventListenerObject {
@@ -434,16 +435,16 @@ export interface Request extends Body {
    * indicating how the the request will interact with the browser's cache when
    * fetching.
    */
-  readonly cache: RequestCache;
+  readonly cache?: RequestCache;
   /** Returns the credentials mode associated with request, which is a string
    * indicating whether credentials will be sent with the request always, never,
    * or only when sent to a same-origin URL.
    */
-  readonly credentials: RequestCredentials;
+  readonly credentials?: RequestCredentials;
   /** Returns the kind of resource requested by request, (e.g., `document` or
    * `script`).
    */
-  readonly destination: RequestDestination;
+  readonly destination?: RequestDestination;
   /** Returns a Headers object consisting of the headers associated with
    * request.
    *
@@ -455,32 +456,32 @@ export interface Request extends Body {
    * hash of the resource being fetched. Its value consists of multiple hashes
    * separated by whitespace. [SRI]
    */
-  readonly integrity: string;
+  readonly integrity?: string;
   /** Returns a boolean indicating whether or not request is for a history
    * navigation (a.k.a. back-forward navigation).
    */
-  readonly isHistoryNavigation: boolean;
+  readonly isHistoryNavigation?: boolean;
   /** Returns a boolean indicating whether or not request is for a reload
    * navigation.
    */
-  readonly isReloadNavigation: boolean;
+  readonly isReloadNavigation?: boolean;
   /** Returns a boolean indicating whether or not request can outlive the global
    * in which it was created.
    */
-  readonly keepalive: boolean;
+  readonly keepalive?: boolean;
   /** Returns request's HTTP method, which is `GET` by default. */
   readonly method: string;
   /** Returns the mode associated with request, which is a string indicating
    * whether the request will use CORS, or will be restricted to same-origin
    * URLs.
    */
-  readonly mode: RequestMode;
+  readonly mode?: RequestMode;
   /** Returns the redirect mode associated with request, which is a string
    * indicating how redirects for the request will be handled during fetching.
    *
    * A request will follow redirects by default.
    */
-  readonly redirect: RequestRedirect;
+  readonly redirect?: RequestRedirect;
   /** Returns the referrer of request. Its value can be a same-origin URL if
    * explicitly set in init, the empty string to indicate no referrer, and
    * `about:client` when defaulting to the global's default.
@@ -488,16 +489,16 @@ export interface Request extends Body {
    * This is used during fetching to determine the value of the `Referer`
    * header of the request being made.
    */
-  readonly referrer: string;
+  readonly referrer?: string;
   /** Returns the referrer policy associated with request. This is used during
    * fetching to compute the value of the request's referrer.
    */
-  readonly referrerPolicy: ReferrerPolicy;
+  readonly referrerPolicy?: ReferrerPolicy;
   /** Returns the signal associated with request, which is an AbortSignal object
    * indicating whether or not request has been aborted, and its abort event
    * handler.
    */
-  readonly signal: AbortSignal;
+  readonly signal?: AbortSignal;
   /** Returns the URL of request as a string. */
   readonly url: string;
   clone(): Request;