diff --git a/crates/backend/src/typegen.rs b/crates/backend/src/typegen.rs
index 1e94f9a2..f7eeb174 100644
--- a/crates/backend/src/typegen.rs
+++ b/crates/backend/src/typegen.rs
@@ -180,6 +180,7 @@ static KNOWN_TYPES: Lazy<HashMap<&'static str, (&'static str, bool, bool)>> = La
     ("Either25", ("{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}", false, true)),
     ("Either26", ("{} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {} | {}", false, true)),
     ("external", ("object", false, false)),
+    ("Promise", ("Promise<{}>", false, false)),
     ("AbortSignal", ("AbortSignal", false, false)),
     ("JsGlobal", ("typeof global", false, false)),
     ("External", ("ExternalObject<{}>", false, false)),
@@ -333,11 +334,20 @@ pub fn ty_to_ts_type(ty: &Type, is_return_ty: bool, is_struct_field: bool) -> (S
           .with(|c| c.borrow_mut().get(rust_ty.as_str()).cloned())
         {
           ts_ty = Some((t, false));
-        } else if rust_ty == "Promise" {
-          ts_ty = Some((
-            format!("Promise<{}>", args.first().map(|(arg, _)| arg).unwrap()),
-            false,
-          ));
+        } else if rust_ty == "ThreadsafeFunction" {
+          let fatal_tsfn = match args.get(1) {
+            Some((arg, _)) => arg == "Fatal",
+            _ => false,
+          };
+          let first_arg = args.first().map(|(arg, _)| arg).unwrap();
+          ts_ty = if fatal_tsfn {
+            Some((format!("(value: {}) => any", first_arg), false))
+          } else {
+            Some((
+              format!("(err: Error | null, value: {}) => any", first_arg),
+              false,
+            ))
+          };
         } else {
           // there should be runtime registered type in else
           let type_alias = ALIAS.with(|aliases| {
diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index 76385fc9..7e9a0429 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -200,6 +200,8 @@ Generated by [AVA](https://avajs.dev).
     export function threadsafeFunctionClosureCapture(func: (...args: any[]) => any): void␊
     export function tsfnCallWithCallback(func: (...args: any[]) => any): void␊
     export function tsfnAsyncCall(func: (...args: any[]) => any): Promise<void>␊
+    export function acceptThreadsafeFunction(func: (err: Error | null, value: number) => any): void␊
+    export function acceptThreadsafeFunctionFatal(func: (value: number) => any): void␊
     export function getBuffer(): Buffer␊
     export function appendBuffer(buf: Buffer): Buffer␊
     export function getEmptyBuffer(): Buffer␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index 375b4dee..fc83e0b5 100644
Binary files a/examples/napi/__test__/typegen.spec.ts.snap and b/examples/napi/__test__/typegen.spec.ts.snap differ
diff --git a/examples/napi/__test__/values.spec.ts b/examples/napi/__test__/values.spec.ts
index 1747067c..87ad5b3b 100644
--- a/examples/napi/__test__/values.spec.ts
+++ b/examples/napi/__test__/values.spec.ts
@@ -116,6 +116,8 @@ import {
   captureErrorInCallback,
   bigintFromI128,
   bigintFromI64,
+  acceptThreadsafeFunction,
+  acceptThreadsafeFunctionFatal,
 } from '../'
 
 test('export const', (t) => {
@@ -792,6 +794,28 @@ Napi4Test('async call ThreadsafeFunction', async (t) => {
   )
 })
 
+Napi4Test('accept ThreadsafeFunction', async (t) => {
+  await new Promise<void>((resolve, reject) => {
+    acceptThreadsafeFunction((err, value) => {
+      if (err) {
+        reject(err)
+      } else {
+        t.is(value, 1)
+        resolve()
+      }
+    })
+  })
+})
+
+Napi4Test('accept ThreadsafeFunction Fatal', async (t) => {
+  await new Promise<void>((resolve) => {
+    acceptThreadsafeFunctionFatal((value) => {
+      t.is(value, 1)
+      resolve()
+    })
+  })
+})
+
 const Napi5Test = Number(process.versions.napi) >= 5 ? test : test.skip
 
 Napi5Test('Date test', (t) => {
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index aab94c85..df0dcced 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -190,6 +190,8 @@ export function threadsafeFunctionFatalModeError(cb: (...args: any[]) => any): v
 export function threadsafeFunctionClosureCapture(func: (...args: any[]) => any): void
 export function tsfnCallWithCallback(func: (...args: any[]) => any): void
 export function tsfnAsyncCall(func: (...args: any[]) => any): Promise<void>
+export function acceptThreadsafeFunction(func: (err: Error | null, value: number) => any): void
+export function acceptThreadsafeFunctionFatal(func: (value: number) => any): void
 export function getBuffer(): Buffer
 export function appendBuffer(buf: Buffer): Buffer
 export function getEmptyBuffer(): Buffer
diff --git a/examples/napi/src/threadsafe_function.rs b/examples/napi/src/threadsafe_function.rs
index fc762e88..fe88ab64 100644
--- a/examples/napi/src/threadsafe_function.rs
+++ b/examples/napi/src/threadsafe_function.rs
@@ -102,3 +102,17 @@ pub fn tsfn_async_call(env: Env, func: JsFunction) -> napi::Result<Object> {
     Ok(())
   })
 }
+
+#[napi]
+pub fn accept_threadsafe_function(func: ThreadsafeFunction<u32>) {
+  thread::spawn(move || {
+    func.call(Ok(1), ThreadsafeFunctionCallMode::NonBlocking);
+  });
+}
+
+#[napi]
+pub fn accept_threadsafe_function_fatal(func: ThreadsafeFunction<u32, ErrorStrategy::Fatal>) {
+  thread::spawn(move || {
+    func.call(1, ThreadsafeFunctionCallMode::NonBlocking);
+  });
+}