diff --git a/crates/web-sys/src/features/gen_WorkerOptions.rs b/crates/web-sys/src/features/gen_WorkerOptions.rs
index b2974634544..b4e6791454f 100644
--- a/crates/web-sys/src/features/gen_WorkerOptions.rs
+++ b/crates/web-sys/src/features/gen_WorkerOptions.rs
@@ -19,6 +19,24 @@ impl WorkerOptions {
         let mut ret: Self = ::wasm_bindgen::JsCast::unchecked_into(::js_sys::Object::new());
         ret
     }
+    #[cfg(feature = "RequestCredentials")]
+    #[doc = "Change the `credentials` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `RequestCredentials`, `WorkerOptions`*"]
+    pub fn credentials(&mut self, val: RequestCredentials) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(
+            self.as_ref(),
+            &JsValue::from("credentials"),
+            &JsValue::from(val),
+        );
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
     #[doc = "Change the `name` field of this object."]
     #[doc = ""]
     #[doc = "*This API requires the following crate features to be activated: `WorkerOptions`*"]
@@ -32,6 +50,20 @@ impl WorkerOptions {
         let _ = r;
         self
     }
+    #[cfg(feature = "WorkerType")]
+    #[doc = "Change the `type` field of this object."]
+    #[doc = ""]
+    #[doc = "*This API requires the following crate features to be activated: `WorkerOptions`, `WorkerType`*"]
+    pub fn type_(&mut self, val: WorkerType) -> &mut Self {
+        use wasm_bindgen::JsValue;
+        let r = ::js_sys::Reflect::set(self.as_ref(), &JsValue::from("type"), &JsValue::from(val));
+        debug_assert!(
+            r.is_ok(),
+            "setting properties should never fail on our dictionary objects"
+        );
+        let _ = r;
+        self
+    }
 }
 impl Default for WorkerOptions {
     fn default() -> Self {
diff --git a/crates/web-sys/src/features/gen_WorkerType.rs b/crates/web-sys/src/features/gen_WorkerType.rs
new file mode 100644
index 00000000000..3ae50015616
--- /dev/null
+++ b/crates/web-sys/src/features/gen_WorkerType.rs
@@ -0,0 +1,11 @@
+#![allow(unused_imports)]
+use wasm_bindgen::prelude::*;
+#[wasm_bindgen]
+#[doc = "The `WorkerType` enum."]
+#[doc = ""]
+#[doc = "*This API requires the following crate features to be activated: `WorkerType`*"]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum WorkerType {
+    Classic = "classic",
+    Module = "module",
+}
diff --git a/crates/web-sys/src/features/mod.rs b/crates/web-sys/src/features/mod.rs
index 10f658fe99f..54cacbade5b 100644
--- a/crates/web-sys/src/features/mod.rs
+++ b/crates/web-sys/src/features/mod.rs
@@ -8140,6 +8140,12 @@ mod gen_WorkerOptions;
 #[cfg(feature = "WorkerOptions")]
 pub use gen_WorkerOptions::*;
 
+#[cfg(feature = "WorkerType")]
+#[allow(non_snake_case)]
+mod gen_WorkerType;
+#[cfg(feature = "WorkerType")]
+pub use gen_WorkerType::*;
+
 #[cfg(feature = "Worklet")]
 #[allow(non_snake_case)]
 mod gen_Worklet;
diff --git a/crates/web-sys/webidls/enabled/Worker.webidl b/crates/web-sys/webidls/enabled/Worker.webidl
index 94094ee89d7..dc86f157586 100644
--- a/crates/web-sys/webidls/enabled/Worker.webidl
+++ b/crates/web-sys/webidls/enabled/Worker.webidl
@@ -27,11 +27,13 @@ interface Worker : EventTarget {
 Worker includes AbstractWorker;
 
 dictionary WorkerOptions {
-  // WorkerType type = "classic"; TODO: Bug 1247687
-  // RequestCredentials credentials = "omit"; // credentials is only used if type is "module" TODO: Bug 1247687
+  WorkerType type = "classic";
+  RequestCredentials credentials = "omit"; // credentials is only used if type is "module"
   DOMString name = "";
 };
 
+enum WorkerType { "classic", "module" };
+
 [Constructor(USVString scriptURL),
  Func="mozilla::dom::ChromeWorker::WorkerAvailable",
  Exposed=(Window,DedicatedWorker,SharedWorker,System)]