From 8aa252121311f9020561050a3c2faacc0d4676ee Mon Sep 17 00:00:00 2001
From: Blake Newman <code@blakenewman.dev>
Date: Mon, 9 Jun 2025 11:59:14 +0100
Subject: [PATCH] fix(vite-node): unable to handle errors where sourcemap
 mapping empty (#8071)

Co-authored-by: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
---
 packages/vite-node/src/source-map-handler.ts     |  5 +++--
 test/vite-node/src/empty-mappings/main.ts        |  2 ++
 test/vite-node/src/empty-mappings/vite.config.ts | 14 ++++++++++++++
 test/vite-node/test/cli.test.ts                  |  6 ++++++
 4 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 test/vite-node/src/empty-mappings/main.ts
 create mode 100644 test/vite-node/src/empty-mappings/vite.config.ts

diff --git a/packages/vite-node/src/source-map-handler.ts b/packages/vite-node/src/source-map-handler.ts
index 724013e09..533357efa 100644
--- a/packages/vite-node/src/source-map-handler.ts
+++ b/packages/vite-node/src/source-map-handler.ts
@@ -177,10 +177,11 @@ function mapSourcePosition(position: OriginalMapping) {
   if (!sourceMap) {
     // Call the (overridable) retrieveSourceMap function to get the source map.
     const urlAndMap = retrieveSourceMap(position.source)
-    if (urlAndMap && urlAndMap.map) {
+    const map = urlAndMap && urlAndMap.map
+    if (map && !(typeof map === 'object' && 'mappings' in map && map.mappings === '')) {
       sourceMap = sourceMapCache[position.source] = {
         url: urlAndMap.url,
-        map: new TraceMap(urlAndMap.map),
+        map: new TraceMap(map),
       }
 
       // Load all sources stored inline with the source map into the file cache
diff --git a/test/vite-node/src/empty-mappings/main.ts b/test/vite-node/src/empty-mappings/main.ts
new file mode 100644
index 000000000..94b611d2d
--- /dev/null
+++ b/test/vite-node/src/empty-mappings/main.ts
@@ -0,0 +1,2 @@
+// eslint-disable-next-line no-console
+console.log(new Error('[ok]').stack)
diff --git a/test/vite-node/src/empty-mappings/vite.config.ts b/test/vite-node/src/empty-mappings/vite.config.ts
new file mode 100644
index 000000000..8d7d10f96
--- /dev/null
+++ b/test/vite-node/src/empty-mappings/vite.config.ts
@@ -0,0 +1,14 @@
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  plugins: [
+    {
+      name: 'repro',
+      transform(code, id) {
+        if (id.endsWith('/empty-mappings/main.ts')) {
+          return { code, map: { mappings: '' } }
+        }
+      },
+    },
+  ],
+})
diff --git a/test/vite-node/test/cli.test.ts b/test/vite-node/test/cli.test.ts
index de28516c8..3e496d54d 100644
--- a/test/vite-node/test/cli.test.ts
+++ b/test/vite-node/test/cli.test.ts
@@ -74,3 +74,9 @@ it('buildStart with all ssr', async () => {
   )
   await result.viteNode.waitForStdout('["buildStart:in","buildStart:out"]')
 })
+
+it('empty mappings', async () => {
+  const root = resolve(__dirname, '../src/empty-mappings')
+  const result = await runViteNodeCli('--root', root, resolve(root, 'main.ts'))
+  await result.viteNode.waitForStdout('[ok]')
+})
-- 
2.51.2