nodejs
diff --git a/‎lib/util.js‎
Lines changed: 1 addition & 2 deletions b/‎lib/util.js‎
Lines changed: 1 addition & 2 deletions
diff --git a/‎test/fixtures/source-map/get-call-sites-function-name-mapped.js‎
Lines changed: 2 additions & 0 deletions b/‎test/fixtures/source-map/get-call-sites-function-name-mapped.js‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎test/fixtures/source-map/get-call-sites-function-name-mapped.map‎
Lines changed: 7 additions & 0 deletions b/‎test/fixtures/source-map/get-call-sites-function-name-mapped.map‎
Lines changed: 7 additions & 0 deletions
diff --git a/‎test/parallel/test-util-getcallsites-sourcemap.js‎
Lines changed: 12 additions & 0 deletions b/‎test/parallel/test-util-getcallsites-sourcemap.js‎
Lines changed: 12 additions & 0 deletions
@@ -515,8 +515,7 @@ function reconstructCallSite(callSite) {
   if (!entry?.originalSource) return;
   return {
     __proto__: null,
-    // If the name is not found, it is an empty string to match the behavior of `util.getCallSite()`
-    functionName: entry.name ?? '',
+    functionName: entry.name || callSite.functionName,
     scriptName: entry.originalSource,
     lineNumber: entry.originalLine + 1,
     column: entry.originalColumn + 1,
 
@@ -0,0 +1,7 @@
+{
+  "version": 3,
+  "sources": ["get-call-sites-function-name-original.js"],
+  "sourcesContent": ["const { getCallSites } = require('node:util'); function foo() { process.stdout.write(JSON.stringify(getCallSites({ sourceMap: true })[0])); } foo();"],
+  "mappings": "AAAA,KAAM,CAAE,YAAa,EAAI,QAAQ,WAAW,EAAG,SAAS,KAAM,CAAE,QAAQ,OAAO,MAAM,KAAK,UAAU,aAAa,CAAE,UAAW,EAAK,CAAC,EAAE,CAAC,CAAC,CAAC,CAAG,CAAE,IAAI",
+  "names": []
+}
@@ -39,6 +39,18 @@ const fixtures = require('../common/fixtures');
   assert.strictEqual(callSite.columnNumber, 1);
 }
 
+// A source map may omit names, so preserve the function name from the call site.
+{
+  const file = fixtures.path('source-map', 'get-call-sites-function-name-mapped.js');
+  const { status, stderr, stdout } = spawnSync(
+    process.execPath,
+    ['--enable-source-maps', file],
+  );
+  assert.strictEqual(status, 0, stderr.toString());
+  const callSite = JSON.parse(stdout.toString());
+  assert.strictEqual(callSite.functionName, 'foo');
+}
+
 // Without --enable-source-maps the generated file path is preserved.
 {
   const file = fixtures.path('source-map', 'get-call-sites-mapped.js');