4 files changed, 6 insertions, 58 deletions
diff --git a/extensions/fetch/20_headers.js b/extensions/fetch/20_headers.js
index 8259c0cca..5f865749a 100644
--- a/extensions/fetch/20_headers.js
+++ b/extensions/fetch/20_headers.js
@@ -392,6 +392,8 @@
 
   webidl.mixinPairIterable("Headers", Headers, _iterableHeaders, 0, 1);
 
+  webidl.configurePrototype(Headers);
+
   webidl.converters["sequence<ByteString>"] = webidl
     .createSequenceConverter(webidl.converters["ByteString"]);
   webidl.converters["sequence<sequence<ByteString>>"] = webidl
diff --git a/extensions/fetch/21_formdata.js b/extensions/fetch/21_formdata.js
index a178025b7..beae69aca 100644
--- a/extensions/fetch/21_formdata.js
+++ b/extensions/fetch/21_formdata.js
@@ -241,6 +241,8 @@
 
   webidl.mixinPairIterable("FormData", FormData, entryList, "name", "value");
 
+  webidl.configurePrototype(FormData);
+
   class MultipartBuilder {
     /**
      * @param {FormData} formData
diff --git a/extensions/fetch/23_request.js b/extensions/fetch/23_request.js
index 29eddcf22..d03023687 100644
--- a/extensions/fetch/23_request.js
+++ b/extensions/fetch/23_request.js
@@ -384,31 +384,7 @@
 
   mixinBody(Request, _body, _mimeType);
 
-  Object.defineProperty(Request.prototype, "method", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Request.prototype, "url", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Request.prototype, "headers", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Request.prototype, "redirect", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Request.prototype, "signal", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Request.prototype, "clone", {
-    enumerable: true,
-    writable: true,
-    configurable: true,
-  });
+  webidl.configurePrototype(Request);
 
   webidl.converters["Request"] = webidl.createInterfaceConverter(
     "Request",
diff --git a/extensions/fetch/23_response.js b/extensions/fetch/23_response.js
index 4d843829b..b1b037187 100644
--- a/extensions/fetch/23_response.js
+++ b/extensions/fetch/23_response.js
@@ -377,39 +377,7 @@
 
   mixinBody(Response, _body, _mimeType);
 
-  Object.defineProperty(Response.prototype, "type", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "url", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "redirected", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "status", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "ok", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "statusText", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "headers", {
-    enumerable: true,
-    configurable: true,
-  });
-  Object.defineProperty(Response.prototype, "clone", {
-    enumerable: true,
-    writable: true,
-    configurable: true,
-  });
+  webidl.configurePrototype(Response);
 
   webidl.converters["Response"] = webidl.createInterfaceConverter(
     "Response",