1 files changed, 14 insertions, 12 deletions

diff --git a/ext/fetch/23_response.js b/ext/fetch/23_response.js
index e7b205418..14aadbaf2 100644
--- a/ext/fetch/23_response.js
+++ b/ext/fetch/23_response.js
@@ -33,6 +33,7 @@
     MapPrototypeHas,
     MapPrototypeGet,
     MapPrototypeSet,
+    ObjectPrototypeIsPrototypeOf,
     RangeError,
     RegExp,
     RegExpPrototypeTest,
@@ -297,7 +298,7 @@
      * @returns {"basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect"}
      */
     get type() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       return this[_response].type;
     }
 
@@ -305,7 +306,7 @@
      * @returns {string}
      */
     get url() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       const url = this[_response].url();
       if (url === null) return "";
       const newUrl = new URL(url);
@@ -317,7 +318,7 @@
      * @returns {boolean}
      */
     get redirected() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       return this[_response].urlList.length > 1;
     }
 
@@ -325,7 +326,7 @@
      * @returns {number}
      */
     get status() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       return this[_response].status;
     }
 
@@ -333,7 +334,7 @@
      * @returns {boolean}
      */
     get ok() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       const status = this[_response].status;
       return status >= 200 && status <= 299;
     }
@@ -342,7 +343,7 @@
      * @returns {string}
      */
     get statusText() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       return this[_response].statusMessage;
     }
 
@@ -350,7 +351,7 @@
      * @returns {Headers}
      */
     get headers() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       return this[_headers];
     }
 
@@ -358,7 +359,7 @@
      * @returns {Response}
      */
     clone() {
-      webidl.assertBranded(this, Response);
+      webidl.assertBranded(this, ResponsePrototype);
       if (this[_body] && this[_body].unusable()) {
         throw new TypeError("Body is unusable.");
       }
@@ -375,7 +376,7 @@
     [SymbolFor("Deno.customInspect")](inspect) {
       return inspect(consoleInternal.createFilteredInspectProxy({
         object: this,
-        evaluate: this instanceof Response,
+        evaluate: ObjectPrototypeIsPrototypeOf(ResponsePrototype, this),
         keys: [
           "body",
           "bodyUsed",
@@ -390,13 +391,13 @@
     }
   }
 
-  mixinBody(Response, _body, _mimeType);
-
   webidl.configurePrototype(Response);
+  const ResponsePrototype = Response.prototype;
+  mixinBody(ResponsePrototype, _body, _mimeType);
 
   webidl.converters["Response"] = webidl.createInterfaceConverter(
     "Response",
-    Response,
+    ResponsePrototype,
   );
   webidl.converters["ResponseInit"] = webidl.createDictionaryConverter(
     "ResponseInit",
@@ -457,6 +458,7 @@
 
   window.__bootstrap.fetch ??= {};
   window.__bootstrap.fetch.Response = Response;
+  window.__bootstrap.fetch.ResponsePrototype = ResponsePrototype;
   window.__bootstrap.fetch.newInnerResponse = newInnerResponse;
   window.__bootstrap.fetch.toInnerResponse = toInnerResponse;
   window.__bootstrap.fetch.fromInnerResponse = fromInnerResponse;