From 9039ebd5ad7ca2713bd760de1736ca5fb5248631 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Wed, 13 Nov 2024 14:53:33 +0100
Subject: [PATCH] Add Error.isError

It's strictly speaking not at phase 3 yet (almost!) but it's very easy
to implement and quite useful.
---
 quickjs.c    | 7 +++++++
 test262.conf | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/quickjs.c b/quickjs.c
index 18382b48..a6936f65 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -37928,6 +37928,12 @@ static const JSCFunctionListEntry js_error_proto_funcs[] = {
     JS_PROP_STRING_DEF("message", "", JS_PROP_WRITABLE | JS_PROP_CONFIGURABLE ),
 };
 
+static JSValue js_error_isError(JSContext *ctx, JSValue this_val,
+                                int argc, JSValue *argv)
+{
+    return js_bool(JS_IsError(ctx, argv[0]));
+}
+
 static JSValue js_error_get_stackTraceLimit(JSContext *ctx, JSValue this_val)
 {
     JSValue val;
@@ -37971,6 +37977,7 @@ static JSValue js_error_set_prepareStackTrace(JSContext *ctx, JSValue this_val,
 }
 
 static const JSCFunctionListEntry js_error_funcs[] = {
+    JS_CFUNC_DEF("isError", 1, js_error_isError ),
     JS_CGETSET_DEF("stackTraceLimit", js_error_get_stackTraceLimit, js_error_set_stackTraceLimit ),
     JS_CGETSET_DEF("prepareStackTrace", js_error_get_prepareStackTrace, js_error_set_prepareStackTrace ),
 };
diff --git a/test262.conf b/test262.conf
index 9d206b91..e8710fd5 100644
--- a/test262.conf
+++ b/test262.conf
@@ -97,7 +97,7 @@ destructuring-assignment
 destructuring-binding
 dynamic-import
 error-cause
-Error.isError=skip
+Error.isError
 explicit-resource-management=skip
 exponentiation
 export-star-as-namespace-from-module