fix(napi): propagation error in function call (#1315)

crates/backend/src/codegen/fn.rs

@@ -343,7 +343,8 @@ impl NapiFn {
 
         let mut ret_ptr = std::ptr::null_mut();
 
-        napi::bindgen_prelude::check_status!(
+        napi::bindgen_prelude::check_pending_exception!(
+          env,
           napi::bindgen_prelude::sys::napi_call_function(
             env,
             cb.this(),
@@ -351,8 +352,7 @@ impl NapiFn {
             args.len(),
             args.as_ptr(),
             &mut ret_ptr
-          ),
-          "Failed to call napi callback",
+          )
         )?;
 
         #ret

crates/backend/src/typegen.rs

@@ -148,6 +148,10 @@ static KNOWN_TYPES: Lazy<HashMap<&'static str, &'static str>> = Lazy::new(|| {
     ("Buffer", "Buffer"),
     ("Vec", "Array<{}>"),
     ("Result", "Error | {}"),
+    ("Error", "Error"),
+    ("JsError", "Error"),
+    ("JsTypeError", "TypeError"),
+    ("JsRangeError", "RangeError"),
     ("ClassInstance", "{}"),
     ("Either", "{} | {}"),
     ("Either3", "{} | {} | {}"),

crates/napi/src/error.rs

@@ -12,6 +12,7 @@ use serde::{de, ser};
 #[cfg(feature = "serde-json")]
 use serde_json::Error as SerdeJSONError;
 
+use crate::bindgen_runtime::ToNapiValue;
 use crate::{check_status, sys, Env, JsUnknown, NapiValue, Status};
 
 pub type Result<T> = std::result::Result<T, Error>;
@@ -28,6 +29,21 @@ pub struct Error {
   maybe_env: sys::napi_env,
 }
 
+impl ToNapiValue for Error {
+  unsafe fn to_napi_value(env: sys::napi_env, val: Self) -> Result<sys::napi_value> {
+    if val.maybe_raw.is_null() {
+      let err = unsafe { JsError::from(val).into_value(env) };
+      Ok(err)
+    } else {
+      let mut value = std::ptr::null_mut();
+      check_status!(unsafe {
+        sys::napi_get_reference_value(val.maybe_env, val.maybe_raw, &mut value)
+      })?;
+      Ok(value)
+    }
+  }
+}
+
 unsafe impl Send for Error {}
 unsafe impl Sync for Error {}
 
@@ -294,6 +310,12 @@ macro_rules! impl_object_methods {
         Self(err)
       }
     }
+
+    impl crate::bindgen_prelude::ToNapiValue for $js_value {
+      unsafe fn to_napi_value(env: sys::napi_env, val: Self) -> Result<sys::napi_value> {
+        unsafe { ToNapiValue::to_napi_value(env, val.0) }
+      }
+    }
   };
 }
 
@@ -334,7 +356,8 @@ macro_rules! check_status {
 #[doc(hidden)]
 #[macro_export]
 macro_rules! check_pending_exception {
-  ($env: expr, $code:expr) => {{
+  ($env:expr, $code:expr) => {{
+    use $crate::NapiValue;
     let c = $code;
     match c {
       $crate::sys::Status::napi_ok => Ok(()),
@@ -344,11 +367,30 @@ macro_rules! check_pending_exception {
           unsafe { $crate::sys::napi_get_and_clear_last_exception($env, &mut error_result) },
           $crate::sys::Status::napi_ok
         );
-        return Err(Error::from(unsafe {
-          JsUnknown::from_raw_unchecked($env, error_result)
+        return Err($crate::Error::from(unsafe {
+          $crate::bindgen_prelude::Unknown::from_raw_unchecked($env, error_result)
         }));
       }
       _ => Err($crate::Error::new($crate::Status::from(c), "".to_owned())),
     }
   }};
+
+  ($env:expr, $code:expr, $($msg:tt)*) => {{
+    use $crate::NapiValue;
+    let c = $code;
+    match c {
+      $crate::sys::Status::napi_ok => Ok(()),
+      $crate::sys::Status::napi_pending_exception => {
+        let mut error_result = std::ptr::null_mut();
+        assert_eq!(
+          unsafe { $crate::sys::napi_get_and_clear_last_exception($env, &mut error_result) },
+          $crate::sys::Status::napi_ok
+        );
+        return Err($crate::Error::from(unsafe {
+          $crate::bindgen_prelude::Unknown::from_raw_unchecked($env, error_result)
+        }));
+      }
+      _ => Err($crate::Error::new($crate::Status::from(c), format!($($msg)*))),
+    }
+  }};
 }

crates/napi/src/lib.rs

@@ -160,8 +160,9 @@ pub mod bindgen_prelude {
   #[cfg(feature = "tokio_rt")]
   pub use crate::tokio_runtime::*;
   pub use crate::{
-    assert_type_of, bindgen_runtime::*, check_status, check_status_or_throw, error, error::*, sys,
-    type_of, JsError, Property, PropertyAttributes, Result, Status, Task, ValueType,
+    assert_type_of, bindgen_runtime::*, check_pending_exception, check_status,
+    check_status_or_throw, error, error::*, sys, type_of, JsError, Property, PropertyAttributes,
+    Result, Status, Task, ValueType,
   };
 
   // This function's signature must be kept in sync with the one in tokio_runtime.rs, otherwise napi

examples/napi/__test__/typegen.spec.ts.md

@@ -43,6 +43,7 @@ Generated by [AVA](https://avajs.dev).
     export function readFile(callback: (arg0: Error | undefined, arg1?: string | undefined | null) => void): void␊
     export function returnJsFunction(): (...args: any[]) => any␊
     export function callbackReturnPromise<T>(functionInput: () => T | Promise<T>, callback: (err: Error | null, result: T) => void): T | Promise<T>␊
+    export function captureErrorInCallback(cb1: () => void, cb2: (arg0: Error) => void): void␊
     export interface ObjectFieldClassInstance {␊
       bird: Bird␊
     }␊

examples/napi/__test__/values.spec.ts

@@ -112,6 +112,7 @@ import {
   CustomFinalize,
   plusOne,
   Width,
+  captureErrorInCallback,
 } from '../'
 
 test('export const', (t) => {
@@ -290,6 +291,15 @@ test('callback', (t) => {
     t.is(err, undefined)
     t.is(content, 'hello world')
   })
+
+  captureErrorInCallback(
+    () => {
+      throw new Error('Testing')
+    },
+    (err) => {
+      t.is((err as Error).message, 'Testing')
+    },
+  )
 })
 
 test('return function', (t) => {

examples/napi/index.d.ts

@@ -33,6 +33,7 @@ export function optionOnly(callback: (arg0?: string | undefined | null) => void)
 export function readFile(callback: (arg0: Error | undefined, arg1?: string | undefined | null) => void): void
 export function returnJsFunction(): (...args: any[]) => any
 export function callbackReturnPromise<T>(functionInput: () => T | Promise<T>, callback: (err: Error | null, result: T) => void): T | Promise<T>
+export function captureErrorInCallback(cb1: () => void, cb2: (arg0: Error) => void): void
 export interface ObjectFieldClassInstance {
   bird: Bird
 }

examples/napi/src/callback.rs

@@ -80,3 +80,15 @@ fn callback_return_promise<T: Fn() -> Result<JsUnknown>>(
     Ok(ret)
   }
 }
+
+#[napi]
+pub fn capture_error_in_callback<C: Fn() -> Result<()>, E: Fn(Error) -> Result<()>>(
+  cb1: C,
+  cb2: E,
+) -> Result<()> {
+  if let Err(e) = cb1() {
+    cb2(e)
+  } else {
+    Ok(())
+  }
+}