diff --git a/src/client/swruntime.ts b/src/client/swruntime.ts
new file mode 100644
index 0000000..28fda91
--- /dev/null
+++ b/src/client/swruntime.ts
@@ -0,0 +1,21 @@
+import { encodeUrl } from "../shared/rewriters/url";
+
+class ScramjetServiceWorkerRuntime {
+	constructor() {
+		addEventListener("message", (event) => {
+			if ("scramjet$type" in event.data) {
+				event.stopImmediatePropagation();
+
+				return;
+			}
+		});
+	}
+}
+
+declare global {
+	interface Window {
+		ScramjetServiceWorkerRuntime: typeof ScramjetServiceWorkerRuntime;
+	}
+}
+
+self.ScramjetServiceWorkerRuntime = ScramjetServiceWorkerRuntime;
diff --git a/src/client/window.ts b/src/client/window.ts
index dab327f..92ea9e9 100644
--- a/src/client/window.ts
+++ b/src/client/window.ts
@@ -45,6 +45,14 @@ export const windowProxy = new Proxy(self, {
 
 		return Reflect.set(target, prop, newValue);
 	},
+	defineProperty(target, property, attributes) {
+		if (!attributes.get && !attributes.set) {
+			attributes.writable = true;
+		}
+		attributes.configurable = true;
+
+		return Reflect.defineProperty(target, property, attributes);
+	},
 });
 
 export const documentProxy = new Proxy(self.document || {}, {
diff --git a/src/client/worker.ts b/src/client/worker.ts
index 031d5af..78d9c08 100644
--- a/src/client/worker.ts
+++ b/src/client/worker.ts
@@ -25,8 +25,50 @@ if ("window" in self) {
 			return Reflect.apply(target, thisArg, argArray);
 		},
 	});
-	//@ts-expect-error temporary until nested sw support
-	delete window.Navigator.prototype.serviceWorker;
+
+	client.Proxy("navigator.serviceWorker.register", {
+		apply(ctx) {
+			if (ctx.args[0] instanceof URL) ctx.args[0] = ctx.args[0].href;
+			let url = encodeUrl(ctx.args[0]) + "?dest=serviceworker";
+			if (ctx.args[1] && ctx.args[1].type === "module") {
+				url += "&type=module";
+			}
+			let worker = new SharedWorker(url);
+
+			let handle = worker.port;
+
+			navigator.serviceWorker.controller.postMessage({
+				scramjet$type: "registerServiceWorker",
+				port: handle,
+			});
+
+			const fakeRegistration = new Proxy(
+				{
+					__proto__: ServiceWorkerRegistration.prototype,
+				},
+				{
+					get(target, prop) {
+						if (prop === "installing") {
+							return null;
+						}
+						if (prop === "waiting") {
+							return null;
+						}
+						if (prop === "active") {
+							return handle;
+						}
+						if (prop === "scope") {
+							return ctx.args[0];
+						}
+
+						return Reflect.get(target, prop);
+					},
+				}
+			);
+
+			ctx.return(new Promise((resolve) => resolve(fakeRegistration)));
+		},
+	});
 }
 
 client.Proxy("importScripts", {
diff --git a/src/worker/fakesw.ts b/src/worker/fakesw.ts
new file mode 100644
index 0000000..2cd08c2
--- /dev/null
+++ b/src/worker/fakesw.ts
@@ -0,0 +1,3 @@
+export class FakeServiceWorker {
+	constructor(public handle: MessagePort) {}
+}
diff --git a/src/worker/index.ts b/src/worker/index.ts
index 9218f8a..7387372 100644
--- a/src/worker/index.ts
+++ b/src/worker/index.ts
@@ -1,3 +1,4 @@
+import { FakeServiceWorker } from "./fakesw";
 import { swfetch } from "./fetch";
 import { ScramjetThreadpool } from "./threadpool";
 
@@ -15,6 +16,8 @@ export class ScramjetServiceWorker {
 	syncPool: Record<number, (val?: any) => void> = {};
 	synctoken = 0;
 
+	serviceWorkers: FakeServiceWorker[] = [];
+
 	constructor(config = self.$scramjet.config) {
 		this.client = new self.$scramjet.shared.util.BareClient();
 		if (!config.prefix) config.prefix = "/scramjet/";
@@ -23,6 +26,14 @@ export class ScramjetServiceWorker {
 		this.threadpool = new ScramjetThreadpool();
 
 		addEventListener("message", ({ data }) => {
+			if (!("scramjet$type" in data)) return;
+
+			if (data.scramjet$type === "registerServiceWorker") {
+				this.serviceWorkers.push(new FakeServiceWorker(data.port));
+
+				return;
+			}
+
 			if (!("scramjet$token" in data)) return;
 
 			const resolve = this.syncPool[data.scramjet$token];