1 files changed, 1009 insertions, 0 deletions
diff --git a/ext/napi/node_api.rs b/ext/napi/node_api.rs
new file mode 100644
index 000000000..2ca5c8d0b
--- /dev/null
+++ b/ext/napi/node_api.rs
@@ -0,0 +1,1009 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+#![deny(unsafe_op_in_unsafe_fn)]
+
+use super::util::get_array_buffer_ptr;
+use super::util::make_external_backing_store;
+use super::util::napi_clear_last_error;
+use super::util::napi_set_last_error;
+use super::util::SendPtr;
+use crate::check_arg;
+use crate::check_env;
+use crate::*;
+use deno_core::parking_lot::Condvar;
+use deno_core::parking_lot::Mutex;
+use deno_core::V8CrossThreadTaskSpawner;
+use napi_sym::napi_sym;
+use std::sync::atomic::AtomicBool;
+use std::sync::atomic::AtomicU8;
+use std::sync::atomic::AtomicUsize;
+use std::sync::atomic::Ordering;
+use std::sync::Arc;
+
+#[napi_sym]
+fn napi_module_register(module: *const NapiModule) -> napi_status {
+  MODULE_TO_REGISTER.with(|cell| {
+    let mut slot = cell.borrow_mut();
+    let prev = slot.replace(module);
+    assert!(prev.is_none());
+  });
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_add_env_cleanup_hook(
+  env: *mut Env,
+  fun: Option<napi_cleanup_hook>,
+  arg: *mut c_void,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, fun);
+
+  let fun = fun.unwrap();
+
+  env.add_cleanup_hook(fun, arg);
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_remove_env_cleanup_hook(
+  env: *mut Env,
+  fun: Option<napi_cleanup_hook>,
+  arg: *mut c_void,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, fun);
+
+  let fun = fun.unwrap();
+
+  env.remove_cleanup_hook(fun, arg);
+
+  napi_ok
+}
+
+struct AsyncCleanupHandle {
+  env: *mut Env,
+  hook: napi_async_cleanup_hook,
+  data: *mut c_void,
+}
+
+unsafe extern "C" fn async_cleanup_handler(arg: *mut c_void) {
+  unsafe {
+    let handle = Box::<AsyncCleanupHandle>::from_raw(arg as _);
+    (handle.hook)(arg, handle.data);
+  }
+}
+
+#[napi_sym]
+fn napi_add_async_cleanup_hook(
+  env: *mut Env,
+  hook: Option<napi_async_cleanup_hook>,
+  arg: *mut c_void,
+  remove_handle: *mut napi_async_cleanup_hook_handle,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, hook);
+
+  let hook = hook.unwrap();
+
+  let handle = Box::into_raw(Box::new(AsyncCleanupHandle {
+    env,
+    hook,
+    data: arg,
+  })) as *mut c_void;
+
+  env.add_cleanup_hook(async_cleanup_handler, handle);
+
+  if !remove_handle.is_null() {
+    unsafe {
+      *remove_handle = handle;
+    }
+  }
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_remove_async_cleanup_hook(
+  remove_handle: napi_async_cleanup_hook_handle,
+) -> napi_status {
+  if remove_handle.is_null() {
+    return napi_invalid_arg;
+  }
+
+  let handle =
+    unsafe { Box::<AsyncCleanupHandle>::from_raw(remove_handle as _) };
+
+  let env = unsafe { &mut *handle.env };
+
+  env.remove_cleanup_hook(async_cleanup_handler, remove_handle);
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_fatal_exception(env: &mut Env, err: napi_value) -> napi_status {
+  check_arg!(env, err);
+
+  let report_error = v8::Local::new(&mut env.scope(), &env.report_error);
+
+  let this = v8::undefined(&mut env.scope());
+  if report_error
+    .call(&mut env.scope(), this.into(), &[err.unwrap()])
+    .is_none()
+  {
+    return napi_generic_failure;
+  }
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_fatal_error(
+  location: *const c_char,
+  location_len: usize,
+  message: *const c_char,
+  message_len: usize,
+) -> napi_status {
+  let location = if location.is_null() {
+    None
+  } else {
+    unsafe {
+      Some(if location_len == NAPI_AUTO_LENGTH {
+        std::ffi::CStr::from_ptr(location).to_str().unwrap()
+      } else {
+        let slice = std::slice::from_raw_parts(
+          location as *const u8,
+          location_len as usize,
+        );
+        std::str::from_utf8(slice).unwrap()
+      })
+    }
+  };
+
+  let message = if message_len == NAPI_AUTO_LENGTH {
+    unsafe { std::ffi::CStr::from_ptr(message).to_str().unwrap() }
+  } else {
+    let slice = unsafe {
+      std::slice::from_raw_parts(message as *const u8, message_len as usize)
+    };
+    std::str::from_utf8(slice).unwrap()
+  };
+
+  if let Some(location) = location {
+    log::error!("NODE API FATAL ERROR: {} {}", location, message);
+  } else {
+    log::error!("NODE API FATAL ERROR: {}", message);
+  }
+
+  std::process::abort();
+}
+
+#[napi_sym]
+fn napi_open_callback_scope(
+  env: *mut Env,
+  _resource_object: napi_value,
+  _context: napi_value,
+  result: *mut napi_callback_scope,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, result);
+
+  // we open scope automatically when it's needed
+  unsafe {
+    *result = std::ptr::null_mut();
+  }
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_close_callback_scope(
+  env: *mut Env,
+  scope: napi_callback_scope,
+) -> napi_status {
+  let env = check_env!(env);
+  // we close scope automatically when it's needed
+  assert!(scope.is_null());
+  napi_clear_last_error(env)
+}
+
+// NOTE: we don't support "async_hooks::AsyncContext" so these APIs are noops.
+#[napi_sym]
+fn napi_async_init(
+  env: *mut Env,
+  _async_resource: napi_value,
+  _async_resource_name: napi_value,
+  result: *mut napi_async_context,
+) -> napi_status {
+  let env = check_env!(env);
+  unsafe {
+    *result = ptr::null_mut();
+  }
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_async_destroy(
+  env: *mut Env,
+  async_context: napi_async_context,
+) -> napi_status {
+  let env = check_env!(env);
+  assert!(async_context.is_null());
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_make_callback<'s>(
+  env: &'s mut Env,
+  _async_context: napi_async_context,
+  recv: napi_value,
+  func: napi_value,
+  argc: usize,
+  argv: *const napi_value<'s>,
+  result: *mut napi_value<'s>,
+) -> napi_status {
+  check_arg!(env, recv);
+  if argc > 0 {
+    check_arg!(env, argv);
+  }
+
+  let Some(recv) = recv.and_then(|v| v.to_object(&mut env.scope())) else {
+    return napi_object_expected;
+  };
+
+  let Some(func) =
+    func.and_then(|v| v8::Local::<v8::Function>::try_from(v).ok())
+  else {
+    return napi_function_expected;
+  };
+
+  let args = if argc > 0 {
+    unsafe {
+      std::slice::from_raw_parts(argv as *mut v8::Local<v8::Value>, argc)
+    }
+  } else {
+    &[]
+  };
+
+  // TODO: async_context
+
+  let Some(v) = func.call(&mut env.scope(), recv.into(), args) else {
+    return napi_generic_failure;
+  };
+
+  unsafe {
+    *result = v.into();
+  }
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_create_buffer<'s>(
+  env: &'s mut Env,
+  length: usize,
+  data: *mut *mut c_void,
+  result: *mut napi_value<'s>,
+) -> napi_status {
+  check_arg!(env, result);
+
+  let ab = v8::ArrayBuffer::new(&mut env.scope(), length);
+
+  let buffer_constructor =
+    v8::Local::new(&mut env.scope(), &env.buffer_constructor);
+  let Some(buffer) =
+    buffer_constructor.new_instance(&mut env.scope(), &[ab.into()])
+  else {
+    return napi_generic_failure;
+  };
+
+  if !data.is_null() {
+    unsafe {
+      *data = get_array_buffer_ptr(ab);
+    }
+  }
+
+  unsafe {
+    *result = buffer.into();
+  }
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_create_external_buffer<'s>(
+  env: &'s mut Env,
+  length: usize,
+  data: *mut c_void,
+  finalize_cb: napi_finalize,
+  finalize_hint: *mut c_void,
+  result: *mut napi_value<'s>,
+) -> napi_status {
+  check_arg!(env, result);
+
+  let store = make_external_backing_store(
+    env,
+    data,
+    length,
+    ptr::null_mut(),
+    finalize_cb,
+    finalize_hint,
+  );
+
+  let ab =
+    v8::ArrayBuffer::with_backing_store(&mut env.scope(), &store.make_shared());
+
+  let buffer_constructor =
+    v8::Local::new(&mut env.scope(), &env.buffer_constructor);
+  let Some(buffer) =
+    buffer_constructor.new_instance(&mut env.scope(), &[ab.into()])
+  else {
+    return napi_generic_failure;
+  };
+
+  unsafe {
+    *result = buffer.into();
+  }
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_create_buffer_copy<'s>(
+  env: &'s mut Env,
+  length: usize,
+  data: *mut c_void,
+  result_data: *mut *mut c_void,
+  result: *mut napi_value<'s>,
+) -> napi_status {
+  check_arg!(env, result);
+
+  let ab = v8::ArrayBuffer::new(&mut env.scope(), length);
+
+  let buffer_constructor =
+    v8::Local::new(&mut env.scope(), &env.buffer_constructor);
+  let Some(buffer) =
+    buffer_constructor.new_instance(&mut env.scope(), &[ab.into()])
+  else {
+    return napi_generic_failure;
+  };
+
+  let ptr = get_array_buffer_ptr(ab);
+  unsafe {
+    std::ptr::copy(data, ptr, length);
+  }
+
+  if !result_data.is_null() {
+    unsafe {
+      *result_data = ptr;
+    }
+  }
+
+  unsafe {
+    *result = buffer.into();
+  }
+
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_is_buffer(
+  env: *mut Env,
+  value: napi_value,
+  result: *mut bool,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, value);
+  check_arg!(env, result);
+
+  let buffer_constructor =
+    v8::Local::new(&mut env.scope(), &env.buffer_constructor);
+
+  let Some(is_buffer) = value
+    .unwrap()
+    .instance_of(&mut env.scope(), buffer_constructor.into())
+  else {
+    return napi_set_last_error(env, napi_generic_failure);
+  };
+
+  unsafe {
+    *result = is_buffer;
+  }
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_get_buffer_info(
+  env: *mut Env,
+  value: napi_value,
+  data: *mut *mut c_void,
+  length: *mut usize,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, value);
+
+  // NB: Any TypedArray instance seems to be accepted by this function
+  // in Node.js.
+  let Some(ta) =
+    value.and_then(|v| v8::Local::<v8::TypedArray>::try_from(v).ok())
+  else {
+    return napi_set_last_error(env, napi_invalid_arg);
+  };
+
+  if !data.is_null() {
+    unsafe {
+      *data = ta.data();
+    }
+  }
+
+  if !length.is_null() {
+    unsafe {
+      *length = ta.byte_length();
+    }
+  }
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_get_node_version(
+  env: *mut Env,
+  result: *mut *const napi_node_version,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, result);
+
+  const NODE_VERSION: napi_node_version = napi_node_version {
+    major: 20,
+    minor: 11,
+    patch: 1,
+    release: c"Deno".as_ptr(),
+  };
+
+  unsafe {
+    *result = &NODE_VERSION as *const napi_node_version;
+  }
+
+  napi_clear_last_error(env)
+}
+
+struct AsyncWork {
+  state: AtomicU8,
+  env: *mut Env,
+  _async_resource: v8::Global<v8::Object>,
+  _async_resource_name: String,
+  execute: napi_async_execute_callback,
+  complete: Option<napi_async_complete_callback>,
+  data: *mut c_void,
+}
+
+impl AsyncWork {
+  const IDLE: u8 = 0;
+  const QUEUED: u8 = 1;
+  const RUNNING: u8 = 2;
+}
+
+#[napi_sym]
+pub(crate) fn napi_create_async_work(
+  env: *mut Env,
+  async_resource: napi_value,
+  async_resource_name: napi_value,
+  execute: Option<napi_async_execute_callback>,
+  complete: Option<napi_async_complete_callback>,
+  data: *mut c_void,
+  result: *mut napi_async_work,
+) -> napi_status {
+  let env_ptr = env;
+  let env = check_env!(env);
+  check_arg!(env, execute);
+  check_arg!(env, result);
+
+  let resource = if let Some(v) = *async_resource {
+    let Some(resource) = v.to_object(&mut env.scope()) else {
+      return napi_set_last_error(env, napi_object_expected);
+    };
+    resource
+  } else {
+    v8::Object::new(&mut env.scope())
+  };
+
+  let Some(resource_name) =
+    async_resource_name.and_then(|v| v.to_string(&mut env.scope()))
+  else {
+    return napi_set_last_error(env, napi_string_expected);
+  };
+
+  let resource_name = resource_name.to_rust_string_lossy(&mut env.scope());
+
+  let work = Box::new(AsyncWork {
+    state: AtomicU8::new(AsyncWork::IDLE),
+    env: env_ptr,
+    _async_resource: v8::Global::new(&mut env.scope(), resource),
+    _async_resource_name: resource_name,
+    execute: execute.unwrap(),
+    complete,
+    data,
+  });
+
+  unsafe {
+    *result = Box::into_raw(work) as _;
+  }
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+pub(crate) fn napi_delete_async_work(
+  env: *mut Env,
+  work: napi_async_work,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, work);
+
+  drop(unsafe { Box::<AsyncWork>::from_raw(work as _) });
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_get_uv_event_loop(
+  env_ptr: *mut Env,
+  uv_loop: *mut *mut (),
+) -> napi_status {
+  let env = check_env!(env_ptr);
+  check_arg!(env, uv_loop);
+  unsafe {
+    *uv_loop = env_ptr.cast();
+  }
+  0
+}
+
+#[napi_sym]
+pub(crate) fn napi_queue_async_work(
+  env: *mut Env,
+  work: napi_async_work,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, work);
+
+  let work = unsafe { &*(work as *mut AsyncWork) };
+
+  let result =
+    work
+      .state
+      .fetch_update(Ordering::SeqCst, Ordering::SeqCst, |state| {
+        // allow queue if idle or if running, but not if already queued.
+        if state == AsyncWork::IDLE || state == AsyncWork::RUNNING {
+          Some(AsyncWork::QUEUED)
+        } else {
+          None
+        }
+      });
+
+  if result.is_err() {
+    return napi_clear_last_error(env);
+  }
+
+  let work = SendPtr(work);
+
+  env.add_async_work(move || {
+    let work = work.take();
+    let work = unsafe { &*work };
+
+    let state = work.state.compare_exchange(
+      AsyncWork::QUEUED,
+      AsyncWork::RUNNING,
+      Ordering::SeqCst,
+      Ordering::SeqCst,
+    );
+
+    if state.is_ok() {
+      unsafe {
+        (work.execute)(work.env as _, work.data);
+      }
+
+      // reset back to idle if its still marked as running
+      let _ = work.state.compare_exchange(
+        AsyncWork::RUNNING,
+        AsyncWork::IDLE,
+        Ordering::SeqCst,
+        Ordering::Relaxed,
+      );
+    }
+
+    if let Some(complete) = work.complete {
+      let status = if state.is_ok() {
+        napi_ok
+      } else if state == Err(AsyncWork::IDLE) {
+        napi_cancelled
+      } else {
+        napi_generic_failure
+      };
+
+      unsafe {
+        complete(work.env as _, status, work.data);
+      }
+    }
+
+    // `complete` probably deletes this `work`, so don't use it here.
+  });
+
+  napi_clear_last_error(env)
+}
+
+#[napi_sym]
+fn napi_cancel_async_work(env: *mut Env, work: napi_async_work) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, work);
+
+  let work = unsafe { &*(work as *mut AsyncWork) };
+
+  let _ = work.state.compare_exchange(
+    AsyncWork::QUEUED,
+    AsyncWork::IDLE,
+    Ordering::SeqCst,
+    Ordering::Relaxed,
+  );
+
+  napi_clear_last_error(env)
+}
+
+extern "C" fn default_call_js_cb(
+  env: napi_env,
+  js_callback: napi_value,
+  _context: *mut c_void,
+  _data: *mut c_void,
+) {
+  if let Some(js_callback) = *js_callback {
+    if let Ok(js_callback) = v8::Local::<v8::Function>::try_from(js_callback) {
+      let env = unsafe { &mut *(env as *mut Env) };
+      let scope = &mut env.scope();
+      let recv = v8::undefined(scope);
+      js_callback.call(scope, recv.into(), &[]);
+    }
+  }
+}
+
+struct TsFn {
+  env: *mut Env,
+  func: Option<v8::Global<v8::Function>>,
+  max_queue_size: usize,
+  queue_size: Mutex<usize>,
+  queue_cond: Condvar,
+  thread_count: AtomicUsize,
+  thread_finalize_data: *mut c_void,
+  thread_finalize_cb: Option<napi_finalize>,
+  context: *mut c_void,
+  call_js_cb: napi_threadsafe_function_call_js,
+  _resource: v8::Global<v8::Object>,
+  _resource_name: String,
+  is_closing: AtomicBool,
+  is_closed: Arc<AtomicBool>,
+  sender: V8CrossThreadTaskSpawner,
+  is_ref: AtomicBool,
+}
+
+impl Drop for TsFn {
+  fn drop(&mut self) {
+    assert!(self
+      .is_closed
+      .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+      .is_ok());
+
+    self.unref();
+
+    if let Some(finalizer) = self.thread_finalize_cb {
+      unsafe {
+        (finalizer)(self.env as _, self.thread_finalize_data, self.context);
+      }
+    }
+  }
+}
+
+impl TsFn {
+  pub fn acquire(&self) -> napi_status {
+    if self.is_closing.load(Ordering::SeqCst) {
+      return napi_closing;
+    }
+    self.thread_count.fetch_add(1, Ordering::Relaxed);
+    napi_ok
+  }
+
+  pub fn release(
+    tsfn: *mut TsFn,
+    mode: napi_threadsafe_function_release_mode,
+  ) -> napi_status {
+    let tsfn = unsafe { &mut *tsfn };
+
+    let result = tsfn.thread_count.fetch_update(
+      Ordering::Relaxed,
+      Ordering::Relaxed,
+      |x| {
+        if x == 0 {
+          None
+        } else {
+          Some(x - 1)
+        }
+      },
+    );
+
+    if result.is_err() {
+      return napi_invalid_arg;
+    }
+
+    if (result == Ok(1) || mode == napi_tsfn_abort)
+      && tsfn
+        .is_closing
+        .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst)
+        .is_ok()
+    {
+      tsfn.queue_cond.notify_all();
+      let tsfnptr = SendPtr(tsfn);
+      // drop must be queued in order to preserve ordering consistent
+      // with Node.js and so that the finalizer runs on the main thread.
+      tsfn.sender.spawn(move |_| {
+        let tsfn = unsafe { Box::from_raw(tsfnptr.take() as *mut TsFn) };
+        drop(tsfn);
+      });
+    }
+
+    napi_ok
+  }
+
+  pub fn ref_(&self) -> napi_status {
+    if self
+      .is_ref
+      .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst)
+      .is_ok()
+    {
+      let env = unsafe { &mut *self.env };
+      env.threadsafe_function_ref();
+    }
+    napi_ok
+  }
+
+  pub fn unref(&self) -> napi_status {
+    if self
+      .is_ref
+      .compare_exchange(true, false, Ordering::SeqCst, Ordering::SeqCst)
+      .is_ok()
+    {
+      let env = unsafe { &mut *self.env };
+      env.threadsafe_function_unref();
+    }
+
+    napi_ok
+  }
+
+  pub fn call(
+    &self,
+    data: *mut c_void,
+    mode: napi_threadsafe_function_call_mode,
+  ) -> napi_status {
+    if self.is_closing.load(Ordering::SeqCst) {
+      return napi_closing;
+    }
+
+    if self.max_queue_size > 0 {
+      let mut queue_size = self.queue_size.lock();
+      while *queue_size >= self.max_queue_size {
+        if mode == napi_tsfn_blocking {
+          self.queue_cond.wait(&mut queue_size);
+
+          if self.is_closing.load(Ordering::SeqCst) {
+            return napi_closing;
+          }
+        } else {
+          return napi_queue_full;
+        }
+      }
+      *queue_size += 1;
+    }
+
+    let is_closed = self.is_closed.clone();
+    let tsfn = SendPtr(self);
+    let data = SendPtr(data);
+    let context = SendPtr(self.context);
+    let call_js_cb = self.call_js_cb;
+
+    self.sender.spawn(move |scope: &mut v8::HandleScope| {
+      let data = data.take();
+
+      // if is_closed then tsfn is freed, don't read from it.
+      if is_closed.load(Ordering::Relaxed) {
+        unsafe {
+          call_js_cb(
+            std::ptr::null_mut(),
+            None::<v8::Local<v8::Value>>.into(),
+            context.take() as _,
+            data as _,
+          );
+        }
+      } else {
+        let tsfn = tsfn.take();
+
+        let tsfn = unsafe { &*tsfn };
+
+        if tsfn.max_queue_size > 0 {
+          let mut queue_size = tsfn.queue_size.lock();
+          let size = *queue_size;
+          *queue_size -= 1;
+          if size == tsfn.max_queue_size {
+            tsfn.queue_cond.notify_one();
+          }
+        }
+
+        let func = tsfn.func.as_ref().map(|f| v8::Local::new(scope, f));
+
+        unsafe {
+          (tsfn.call_js_cb)(
+            tsfn.env as _,
+            func.into(),
+            tsfn.context,
+            data as _,
+          );
+        }
+      }
+    });
+
+    napi_ok
+  }
+}
+
+#[napi_sym]
+#[allow(clippy::too_many_arguments)]
+fn napi_create_threadsafe_function(
+  env: *mut Env,
+  func: napi_value,
+  async_resource: napi_value,
+  async_resource_name: napi_value,
+  max_queue_size: usize,
+  initial_thread_count: usize,
+  thread_finalize_data: *mut c_void,
+  thread_finalize_cb: Option<napi_finalize>,
+  context: *mut c_void,
+  call_js_cb: Option<napi_threadsafe_function_call_js>,
+  result: *mut napi_threadsafe_function,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, async_resource_name);
+  if initial_thread_count == 0 {
+    return napi_set_last_error(env, napi_invalid_arg);
+  }
+  check_arg!(env, result);
+
+  let func = if let Some(value) = *func {
+    let Ok(func) = v8::Local::<v8::Function>::try_from(value) else {
+      return napi_set_last_error(env, napi_function_expected);
+    };
+    Some(v8::Global::new(&mut env.scope(), func))
+  } else {
+    check_arg!(env, call_js_cb);
+    None
+  };
+
+  let resource = if let Some(v) = *async_resource {
+    let Some(resource) = v.to_object(&mut env.scope()) else {
+      return napi_set_last_error(env, napi_object_expected);
+    };
+    resource
+  } else {
+    v8::Object::new(&mut env.scope())
+  };
+  let resource = v8::Global::new(&mut env.scope(), resource);
+
+  let Some(resource_name) =
+    async_resource_name.and_then(|v| v.to_string(&mut env.scope()))
+  else {
+    return napi_set_last_error(env, napi_string_expected);
+  };
+  let resource_name = resource_name.to_rust_string_lossy(&mut env.scope());
+
+  let tsfn = Box::new(TsFn {
+    env,
+    func,
+    max_queue_size,
+    queue_size: Mutex::new(0),
+    queue_cond: Condvar::new(),
+    thread_count: AtomicUsize::new(initial_thread_count),
+    thread_finalize_data,
+    thread_finalize_cb,
+    context,
+    call_js_cb: call_js_cb.unwrap_or(default_call_js_cb),
+    _resource: resource,
+    _resource_name: resource_name,
+    is_closing: AtomicBool::new(false),
+    is_closed: Arc::new(AtomicBool::new(false)),
+    is_ref: AtomicBool::new(false),
+    sender: env.async_work_sender.clone(),
+  });
+
+  tsfn.ref_();
+
+  unsafe {
+    *result = Box::into_raw(tsfn) as _;
+  }
+
+  napi_clear_last_error(env)
+}
+
+/// Maybe called from any thread.
+#[napi_sym]
+fn napi_get_threadsafe_function_context(
+  func: napi_threadsafe_function,
+  result: *mut *const c_void,
+) -> napi_status {
+  assert!(!func.is_null());
+  let tsfn = unsafe { &*(func as *const TsFn) };
+  unsafe {
+    *result = tsfn.context;
+  }
+  napi_ok
+}
+
+#[napi_sym]
+fn napi_call_threadsafe_function(
+  func: napi_threadsafe_function,
+  data: *mut c_void,
+  is_blocking: napi_threadsafe_function_call_mode,
+) -> napi_status {
+  assert!(!func.is_null());
+  let tsfn = unsafe { &*(func as *mut TsFn) };
+  tsfn.call(data, is_blocking)
+}
+
+#[napi_sym]
+fn napi_acquire_threadsafe_function(
+  tsfn: napi_threadsafe_function,
+) -> napi_status {
+  assert!(!tsfn.is_null());
+  let tsfn = unsafe { &*(tsfn as *mut TsFn) };
+  tsfn.acquire()
+}
+
+#[napi_sym]
+fn napi_release_threadsafe_function(
+  tsfn: napi_threadsafe_function,
+  mode: napi_threadsafe_function_release_mode,
+) -> napi_status {
+  assert!(!tsfn.is_null());
+  TsFn::release(tsfn as _, mode)
+}
+
+#[napi_sym]
+fn napi_unref_threadsafe_function(
+  _env: &mut Env,
+  func: napi_threadsafe_function,
+) -> napi_status {
+  assert!(!func.is_null());
+  let tsfn = unsafe { &*(func as *mut TsFn) };
+  tsfn.unref()
+}
+
+#[napi_sym]
+fn napi_ref_threadsafe_function(
+  _env: &mut Env,
+  func: napi_threadsafe_function,
+) -> napi_status {
+  assert!(!func.is_null());
+  let tsfn = unsafe { &*(func as *mut TsFn) };
+  tsfn.ref_()
+}
+
+#[napi_sym]
+fn node_api_get_module_file_name(
+  env: *mut Env,
+  result: *mut *const c_char,
+) -> napi_status {
+  let env = check_env!(env);
+  check_arg!(env, result);
+
+  unsafe {
+    *result = env.shared().filename.as_ptr() as _;
+  }
+
+  napi_clear_last_error(env)
+}