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, 22 insertions, 5 deletions

diff --git a/lib/internal/source_map/source_map_cache.js b/lib/internal/source_map/source_map_cache.js
index 06b1a2a5f5..04926acfc1 100644
--- a/lib/internal/source_map/source_map_cache.js
+++ b/lib/internal/source_map/source_map_cache.js
@@ -39,12 +39,28 @@ const { fileURLToPath, URL } = require('url');
 let Module;
 let SourceMap;
 
-let experimentalSourceMaps;
-function maybeCacheSourceMap(filename, content, cjsModuleInstance) {
-  if (experimentalSourceMaps === undefined) {
-    experimentalSourceMaps = getOptionValue('--enable-source-maps');
+let sourceMapsEnabled;
+function getSourceMapsEnabled() {
+  if (sourceMapsEnabled === undefined) {
+    sourceMapsEnabled = getOptionValue('--enable-source-maps');
+    if (sourceMapsEnabled) {
+      const {
+        enableSourceMaps,
+        setPrepareStackTraceCallback
+      } = internalBinding('errors');
+      const {
+        prepareStackTrace
+      } = require('internal/source_map/prepare_stack_trace');
+      setPrepareStackTraceCallback(prepareStackTrace);
+      enableSourceMaps();
+    }
   }
-  if (!(process.env.NODE_V8_COVERAGE || experimentalSourceMaps)) return;
+  return sourceMapsEnabled;
+}
+
+function maybeCacheSourceMap(filename, content, cjsModuleInstance) {
+  const sourceMapsEnabled = getSourceMapsEnabled();
+  if (!(process.env.NODE_V8_COVERAGE || sourceMapsEnabled)) return;
   let basePath;
   try {
     filename = normalizeReferrerURL(filename);
@@ -248,6 +264,7 @@ function findSourceMap(uri, error) {
 
 module.exports = {
   findSourceMap,
+  getSourceMapsEnabled,
   maybeCacheSourceMap,
   rekeySourceMap,
   sourceMapCacheToObject,