diff --git a/src/adapter/index.ts b/src/adapter/index.ts
index 0754bf0..00a9287 100644
--- a/src/adapter/index.ts
+++ b/src/adapter/index.ts
@@ -108,10 +108,11 @@ export const createChromeHandler = <TRouter extends AnyRouter>(
 
         const subscription = result.subscribe({
           next: (data) => {
+            const serializedData = transformer.output.serialize(data);
             sendResponse({
               result: {
                 type: 'data',
-                data,
+                data: serializedData,
               },
             });
           },
diff --git a/test/webext.test.ts b/test/webext.test.ts
index 08af294..58b07a8 100644
--- a/test/webext.test.ts
+++ b/test/webext.test.ts
@@ -132,6 +132,51 @@ test('with subscription', async () => {
   expect(onStoppedMock).toHaveBeenCalledTimes(1);
 });
 
+test('with nested subscription', async () => {
+  // background
+  createChromeHandler({ router: appRouter });
+  expect(chrome.runtime.onConnect.addListener).toHaveBeenCalledTimes(1);
+
+  // content
+  const port = chrome.runtime.connect();
+  const trpc = createTRPCProxyClient<typeof appRouter>({
+    links: [chromeLink({ port })],
+  });
+
+  const onDataMock = jest.fn();
+  const onCompleteMock = jest.fn();
+  const onErrorMock = jest.fn();
+  const onStartedMock = jest.fn();
+  const onStoppedMock = jest.fn();
+  const subscription = await new Promise<Unsubscribable>((resolve) => {
+    const subscription = trpc.nestedRouter.echoSubscription.subscribe(
+      { payload: 'subscription1' },
+      {
+        onData: (data) => {
+          onDataMock(data);
+          resolve(subscription);
+        },
+        onComplete: onCompleteMock,
+        onError: onErrorMock,
+        onStarted: onStartedMock,
+        onStopped: onStoppedMock,
+      },
+    );
+  });
+  expect(onDataMock).toHaveBeenCalledTimes(1);
+  expect(onDataMock).toHaveBeenNthCalledWith(1, { payload: 'subscription1' });
+  expect(onCompleteMock).toHaveBeenCalledTimes(0);
+  expect(onErrorMock).toHaveBeenCalledTimes(0);
+  expect(onStartedMock).toHaveBeenCalledTimes(1);
+  expect(onStoppedMock).toHaveBeenCalledTimes(0);
+  subscription.unsubscribe();
+  expect(onDataMock).toHaveBeenCalledTimes(1);
+  expect(onCompleteMock).toHaveBeenCalledTimes(1);
+  expect(onErrorMock).toHaveBeenCalledTimes(0);
+  expect(onStartedMock).toHaveBeenCalledTimes(1);
+  expect(onStoppedMock).toHaveBeenCalledTimes(1);
+});
+
 // with subscription
 // with error
 // with createcontext
diff --git a/test/webextWTransfromer.test.ts b/test/webextWTransfromer.test.ts
new file mode 100644
index 0000000..869aab2
--- /dev/null
+++ b/test/webextWTransfromer.test.ts
@@ -0,0 +1,228 @@
+import { resetMocks } from './__setup';
+
+import { createTRPCProxyClient } from '@trpc/client';
+import { initTRPC } from '@trpc/server';
+import { Unsubscribable, observable } from '@trpc/server/observable';
+import superjson from 'superjson';
+import { z } from 'zod';
+
+import { createChromeHandler } from '../src/adapter';
+import { chromeLink } from '../src/link';
+
+afterEach(() => {
+  resetMocks();
+});
+
+const t = initTRPC.create({ transformer: superjson });
+
+const appRouter = t.router({
+  echoQuery: t.procedure
+    .input(z.object({ payload: z.string(), date: z.date() }))
+    .query(({ input }) => input),
+  echoMutation: t.procedure
+    .input(z.object({ payload: z.string(), date: z.date() }))
+    .mutation(({ input }) => input),
+  echoSubscription: t.procedure
+    .input(z.object({ payload: z.string(), date: z.date() }))
+    .subscription(({ input }) =>
+      observable<typeof input>((emit) => {
+        emit.next(input);
+      }),
+    ),
+
+  echoTransformerQuery: t.procedure
+    .input(z.object({ payload: z.date() }))
+    .query(({ input }) => input),
+
+  nestedRouter: t.router({
+    echoQuery: t.procedure
+      .input(z.object({ payload: z.string(), date: z.date() }))
+      .query(({ input }) => input),
+    echoMutation: t.procedure
+      .input(z.object({ payload: z.string(), date: z.date() }))
+      .mutation(({ input }) => input),
+    echoSubscription: t.procedure
+      .input(z.object({ payload: z.string(), date: z.date() }))
+      .subscription(({ input }) =>
+        observable((emit) => {
+          emit.next(input);
+        }),
+      ),
+
+    echoTransformerQuery: t.procedure
+      .input(z.object({ payload: z.date() }))
+      .query(({ input }) => input),
+  }),
+});
+
+test('with query', async () => {
+  // background
+  createChromeHandler({ router: appRouter });
+  expect(chrome.runtime.onConnect.addListener).toHaveBeenCalledTimes(1);
+
+  // content
+  const port = chrome.runtime.connect();
+  const trpc = createTRPCProxyClient<typeof appRouter>({
+    links: [chromeLink({ port })],
+    transformer: superjson,
+  });
+
+  // 2023-11-17 08:00:00 utc
+  const date1 = new Date(1700208000000);
+  const data1 = await trpc.echoQuery.query({ payload: 'query1', date: date1 });
+  expect(data1).toEqual({ payload: 'query1', date: date1 });
+
+  // 2023-11-20 08:00:00 utc
+  const date2 = new Date(1700467200000);
+  const data2 = await trpc.nestedRouter.echoQuery.query({ payload: 'query2', date: date2 });
+  expect(data2).toEqual({ payload: 'query2', date: date2 });
+
+  // 2022-11-20 08:00:00 utc
+  const date3 = new Date(1668931200000);
+  // 2021-11-20 08:00:00 utc
+  const date4 = new Date(1637395200000);
+  const [data3, data4] = await Promise.all([
+    trpc.echoQuery.query({ payload: 'query3', date: date3 }),
+    trpc.echoQuery.query({ payload: 'query4', date: date4 }),
+  ]);
+  expect(data3).toEqual({ payload: 'query3', date: date3 });
+  expect(data4).toEqual({ payload: 'query4', date: date4 });
+});
+
+test('with mutation', async () => {
+  // background
+  createChromeHandler({ router: appRouter });
+  expect(chrome.runtime.onConnect.addListener).toHaveBeenCalledTimes(1);
+
+  // content
+  const port = chrome.runtime.connect();
+  const trpc = createTRPCProxyClient<typeof appRouter>({
+    links: [chromeLink({ port })],
+    transformer: superjson,
+  });
+
+  // 2023-11-17 08:00:00 utc
+  const date1 = new Date(1700208000000);
+  const data1 = await trpc.echoMutation.mutate({ payload: 'mutation1', date: date1 });
+  expect(data1).toEqual({ payload: 'mutation1', date: date1 });
+
+  // 2023-11-20 08:00:00 utc
+  const date2 = new Date(1700467200000);
+  const data2 = await trpc.nestedRouter.echoMutation.mutate({ payload: 'mutation2', date: date2 });
+  expect(data2).toEqual({ payload: 'mutation2', date: date2 });
+
+  // 2022-11-20 08:00:00 utc
+  const date3 = new Date(1668931200000);
+  // 2021-11-20 08:00:00 utc
+  const date4 = new Date(1637395200000);
+  const [data3, data4] = await Promise.all([
+    trpc.echoMutation.mutate({ payload: 'mutation3', date: date3 }),
+    trpc.echoMutation.mutate({ payload: 'mutation4', date: date4 }),
+  ]);
+  expect(data3).toEqual({ payload: 'mutation3', date: date3 });
+  expect(data4).toEqual({ payload: 'mutation4', date: date4 });
+});
+
+test('with subscription', async () => {
+  // background
+  createChromeHandler({ router: appRouter });
+  expect(chrome.runtime.onConnect.addListener).toHaveBeenCalledTimes(1);
+
+  // content
+  const port = chrome.runtime.connect();
+  const trpc = createTRPCProxyClient<typeof appRouter>({
+    links: [chromeLink({ port })],
+    transformer: superjson,
+  });
+
+  const onDataMock = jest.fn();
+  const onCompleteMock = jest.fn();
+  const onErrorMock = jest.fn();
+  const onStartedMock = jest.fn();
+  const onStoppedMock = jest.fn();
+
+  // 2023-11-17 08:00:00 utc
+  const date1 = new Date(1700208000000);
+  const subscription = await new Promise<Unsubscribable>((resolve) => {
+    const subscription = trpc.echoSubscription.subscribe(
+      { payload: 'subscription1', date: date1 },
+      {
+        onData: (data) => {
+          onDataMock(data);
+          resolve(subscription);
+        },
+        onComplete: onCompleteMock,
+        onError: onErrorMock,
+        onStarted: onStartedMock,
+        onStopped: onStoppedMock,
+      },
+    );
+  });
+  expect(onDataMock).toHaveBeenCalledTimes(1);
+  expect(onDataMock).toHaveBeenNthCalledWith(1, { payload: 'subscription1', date: date1 });
+  expect(onCompleteMock).toHaveBeenCalledTimes(0);
+  expect(onErrorMock).toHaveBeenCalledTimes(0);
+  expect(onStartedMock).toHaveBeenCalledTimes(1);
+  expect(onStoppedMock).toHaveBeenCalledTimes(0);
+  subscription.unsubscribe();
+  expect(onDataMock).toHaveBeenCalledTimes(1);
+  expect(onCompleteMock).toHaveBeenCalledTimes(1);
+  expect(onErrorMock).toHaveBeenCalledTimes(0);
+  expect(onStartedMock).toHaveBeenCalledTimes(1);
+  expect(onStoppedMock).toHaveBeenCalledTimes(1);
+});
+
+test('with nested subscription', async () => {
+  // background
+  createChromeHandler({ router: appRouter });
+  expect(chrome.runtime.onConnect.addListener).toHaveBeenCalledTimes(1);
+
+  // content
+  const port = chrome.runtime.connect();
+  const trpc = createTRPCProxyClient<typeof appRouter>({
+    links: [chromeLink({ port })],
+    transformer: superjson,
+  });
+
+  const onDataMock = jest.fn();
+  const onCompleteMock = jest.fn();
+  const onErrorMock = jest.fn();
+  const onStartedMock = jest.fn();
+  const onStoppedMock = jest.fn();
+
+  // 2023-11-20 08:00:00 utc
+  const date1 = new Date(1700467200000);
+  const subscription = await new Promise<Unsubscribable>((resolve) => {
+    const subscription = trpc.nestedRouter.echoSubscription.subscribe(
+      { payload: 'subscription1', date: date1 },
+      {
+        onData: (data) => {
+          onDataMock(data);
+          resolve(subscription);
+        },
+        onComplete: onCompleteMock,
+        onError: onErrorMock,
+        onStarted: onStartedMock,
+        onStopped: onStoppedMock,
+      },
+    );
+  });
+  expect(onDataMock).toHaveBeenCalledTimes(1);
+  expect(onDataMock).toHaveBeenNthCalledWith(1, { payload: 'subscription1', date: date1 });
+  expect(onCompleteMock).toHaveBeenCalledTimes(0);
+  expect(onErrorMock).toHaveBeenCalledTimes(0);
+  expect(onStartedMock).toHaveBeenCalledTimes(1);
+  expect(onStoppedMock).toHaveBeenCalledTimes(0);
+  subscription.unsubscribe();
+  expect(onDataMock).toHaveBeenCalledTimes(1);
+  expect(onCompleteMock).toHaveBeenCalledTimes(1);
+  expect(onErrorMock).toHaveBeenCalledTimes(0);
+  expect(onStartedMock).toHaveBeenCalledTimes(1);
+  expect(onStoppedMock).toHaveBeenCalledTimes(1);
+});
+
+// with subscription
+// with error
+// with createcontext
+// with output
+// with multiport