errors: print original exception context

When --enable-source-maps is set, the error context displayed
above the stack trace now shows original source rather than
transpiled.

PR-URL: https://github.com/nodejs/node/pull/33491
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/node_errors.cc b/src/node_errors.cc
index 4e13c24e15..22bc4d994b 100644
--- a/src/node_errors.cc
+++ b/src/node_errors.cc
@@ -57,6 +57,16 @@ static std::string GetErrorSource(Isolate* isolate,
   node::Utf8Value encoded_source(isolate, source_line_maybe.ToLocalChecked());
   std::string sourceline(*encoded_source, encoded_source.length());
 
+  // If source maps have been enabled, the exception line will instead be
+  // added in the JavaScript context:
+  Environment* env = Environment::GetCurrent(isolate);
+  const bool has_source_map_url =
+      !message->GetScriptOrigin().SourceMapUrl().IsEmpty();
+  if (has_source_map_url && env->source_maps_enabled()) {
+    *added_exception_line = false;
+    return sourceline;
+  }
+
   if (sourceline.find("node-do-not-add-exception-line") != std::string::npos) {
     *added_exception_line = false;
     return sourceline;
@@ -802,6 +812,11 @@ void SetPrepareStackTraceCallback(const FunctionCallbackInfo<Value>& args) {
   env->set_prepare_stack_trace_callback(args[0].As<Function>());
 }
 
+static void EnableSourceMaps(const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
+  env->set_source_maps_enabled(true);
+}
+
 static void SetEnhanceStackForFatalException(
     const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
@@ -840,6 +855,7 @@ void Initialize(Local<Object> target,
   Environment* env = Environment::GetCurrent(context);
   env->SetMethod(
       target, "setPrepareStackTraceCallback", SetPrepareStackTraceCallback);
+  env->SetMethod(target, "enableSourceMaps", EnableSourceMaps);
   env->SetMethod(target,
                  "setEnhanceStackForFatalException",
                  SetEnhanceStackForFatalException);