Restricting throwable exception type to JSException for closures

Author: kateinoigakukun

Sources/JavaScriptKit/BasicObjects/JSPromise.swift

@@ -98,10 +98,10 @@ public final class JSPromise: JSBridgedClass {
     @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
     @discardableResult
     public func then(
-        success: sending @escaping (sending JSValue) async throws -> JSValue
+        success: sending @escaping (sending JSValue) async throws(JSException) -> JSValue
     ) -> JSPromise {
-        let closure = JSOneshotClosure.async {
-            try await success($0[0]).jsValue
+        let closure = JSOneshotClosure.async { arguments throws(JSException) -> JSValue in
+            return try await success(arguments[0])
         }
         return JSPromise(unsafelyWrapping: jsObject.then!(closure).object!)
     }
@@ -127,14 +127,14 @@ public final class JSPromise: JSBridgedClass {
     @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
     @discardableResult
     public func then(
-        success: sending @escaping (sending JSValue) async throws -> JSValue,
-        failure: sending @escaping (sending JSValue) async throws -> JSValue
+        success: sending @escaping (sending JSValue) async throws(JSException) -> JSValue,
+        failure: sending @escaping (sending JSValue) async throws(JSException) -> JSValue
     ) -> JSPromise {
-        let successClosure = JSOneshotClosure.async {
-            try await success($0[0]).jsValue
+        let successClosure = JSOneshotClosure.async { arguments throws(JSException) -> JSValue in
+            try await success(arguments[0]).jsValue
         }
-        let failureClosure = JSOneshotClosure.async {
-            try await failure($0[0]).jsValue
+        let failureClosure = JSOneshotClosure.async { arguments throws(JSException) -> JSValue in
+            try await failure(arguments[0]).jsValue
         }
         return JSPromise(unsafelyWrapping: jsObject.then!(successClosure, failureClosure).object!)
     }
@@ -158,10 +158,10 @@ public final class JSPromise: JSBridgedClass {
     @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
     @discardableResult
     public func `catch`(
-        failure: sending @escaping (sending JSValue) async throws -> JSValue
+        failure: sending @escaping (sending JSValue) async throws(JSException) -> JSValue
     ) -> JSPromise {
-        let closure = JSOneshotClosure.async {
-            try await failure($0[0]).jsValue
+        let closure = JSOneshotClosure.async { arguments throws(JSException) -> JSValue in
+            try await failure(arguments[0]).jsValue
         }
         return .init(unsafelyWrapping: jsObject.catch!(closure).object!)
     }

Sources/JavaScriptKit/FundamentalObjects/JSClosure.swift

@@ -45,7 +45,7 @@ public class JSOneshotClosure: JSObject, JSClosureProtocol {
 
     #if compiler(>=5.5) && (!hasFeature(Embedded) || os(WASI))
     @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
-    public static func async(_ body: sending @escaping (sending [JSValue]) async throws -> JSValue) -> JSOneshotClosure
+    public static func async(_ body: sending @escaping (sending [JSValue]) async throws(JSException) -> JSValue) -> JSOneshotClosure
     {
         JSOneshotClosure(makeAsyncClosure(body))
     }
@@ -137,7 +137,7 @@ public class JSClosure: JSFunction, JSClosureProtocol {
 
     #if compiler(>=5.5) && (!hasFeature(Embedded) || os(WASI))
     @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
-    public static func async(_ body: @Sendable @escaping (sending [JSValue]) async throws -> JSValue) -> JSClosure {
+    public static func async(_ body: @Sendable @escaping (sending [JSValue]) async throws(JSException) -> JSValue) -> JSClosure {
         JSClosure(makeAsyncClosure(body))
     }
     #endif
@@ -154,7 +154,7 @@ public class JSClosure: JSFunction, JSClosureProtocol {
 #if compiler(>=5.5) && (!hasFeature(Embedded) || os(WASI))
 @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
 private func makeAsyncClosure(
-    _ body: sending @escaping (sending [JSValue]) async throws -> JSValue
+    _ body: sending @escaping (sending [JSValue]) async throws(JSException) -> JSValue
 ) -> ((sending [JSValue]) -> JSValue) {
     { arguments in
         JSPromise { resolver in