From 154e5e8c67cb3c5e25483a1a0d6a94bffcf9d9f6 Mon Sep 17 00:00:00 2001
From: sapphi-red <49056869+sapphi-red@users.noreply.github.com>
Date: Fri, 12 Dec 2025 12:21:43 +0900
Subject: [PATCH] feat(ssr): avoid errors when rewriting already rewritten
 stacktrace

---
 packages/vite/src/node/server/index.ts        |  1 +
 .../node/ssr/__tests__/ssrStacktrace.spec.ts  | 22 +++++++++++--
 packages/vite/src/node/ssr/ssrStacktrace.ts   | 32 +++++++++++++------
 3 files changed, 43 insertions(+), 12 deletions(-)

diff --git a/packages/vite/src/node/server/index.ts b/packages/vite/src/node/server/index.ts
index 36c5317b54cfd9..bf06bd614018aa 100644
--- a/packages/vite/src/node/server/index.ts
+++ b/packages/vite/src/node/server/index.ts
@@ -648,6 +648,7 @@ export async function _createServer(
         "ssrRewriteStacktrace doesn't need to be used for Environment Module Runners.",
       )
       return ssrRewriteStacktrace(stack, server.environments.ssr.moduleGraph)
+        .result
     },
     async reloadModule(module) {
       warnFutureDeprecation(config, 'removeServerReloadModule')
diff --git a/packages/vite/src/node/ssr/__tests__/ssrStacktrace.spec.ts b/packages/vite/src/node/ssr/__tests__/ssrStacktrace.spec.ts
index f8f2f27666ffa8..422a5d077d9315 100644
--- a/packages/vite/src/node/ssr/__tests__/ssrStacktrace.spec.ts
+++ b/packages/vite/src/node/ssr/__tests__/ssrStacktrace.spec.ts
@@ -1,5 +1,5 @@
 import { fileURLToPath } from 'node:url'
-import { test } from 'vitest'
+import { expect, test } from 'vitest'
 import { createServer } from '../../server'
 
 const root = fileURLToPath(new URL('./', import.meta.url))
@@ -22,8 +22,26 @@ test('call rewriteStacktrace twice', async () => {
   for (let i = 0; i < 2; i++) {
     try {
       await server.ssrLoadModule('/fixtures/modules/has-error.js')
-    } catch (e) {
+    } catch (e: any) {
       server.ssrFixStacktrace(e)
     }
   }
 })
+
+test('outputs message when stacktrace appears to be already rewritten', async () => {
+  const server = await createDevServer()
+  try {
+    await server.ssrLoadModule('/fixtures/modules/has-error.js')
+  } catch (e: any) {
+    // Manually craft an already-rewritten stacktrace with invalid line/column
+    // that will trigger the alreadyRewritten flag
+    e.stack = e.stack.replace(
+      /fixtures\/modules\/has-error\.js:\d+:\d+/,
+      'fixtures/modules/has-error.js:1:1',
+    )
+    server.ssrFixStacktrace(e)
+    expect(e.message).toContain(
+      'The stacktrace appears to be already rewritten by something else',
+    )
+  }
+})
diff --git a/packages/vite/src/node/ssr/ssrStacktrace.ts b/packages/vite/src/node/ssr/ssrStacktrace.ts
index f10b2150937d52..be1bd44874ab33 100644
--- a/packages/vite/src/node/ssr/ssrStacktrace.ts
+++ b/packages/vite/src/node/ssr/ssrStacktrace.ts
@@ -23,14 +23,16 @@ function calculateOffsetOnce() {
 export function ssrRewriteStacktrace(
   stack: string,
   moduleGraph: EnvironmentModuleGraph,
-): string {
+): { result: string; alreadyRewritten: boolean } {
   calculateOffsetOnce()
-  return stack
+
+  let alreadyRewritten = false
+  const rewritten = stack
     .split('\n')
     .map((line) => {
       return line.replace(
         /^ {4}at (?:(\S.*?)\s\()?(.+?):(\d+)(?::(\d+))?\)?/,
-        (input, varName, id, line, column) => {
+        (input, varName, id, originalLine, originalColumn) => {
           if (!id) return input
 
           const mod = moduleGraph.getModuleById(id)
@@ -41,13 +43,15 @@ export function ssrRewriteStacktrace(
           }
 
           const traced = new TraceMap(rawSourceMap as any)
+          const line = Number(originalLine) - offset
+          // stacktrace's column is 1-indexed, but sourcemap's one is 0-indexed
+          const column = Number(originalColumn) - 1
+          if (line <= 0 || column < 0) {
+            alreadyRewritten = true
+            return input
+          }
 
-          const pos = originalPositionFor(traced, {
-            line: Number(line) - offset,
-            // stacktrace's column is 1-indexed, but sourcemap's one is 0-indexed
-            column: Number(column) - 1,
-          })
-
+          const pos = originalPositionFor(traced, { line, column })
           if (!pos.source) {
             return input
           }
@@ -65,6 +69,7 @@ export function ssrRewriteStacktrace(
       )
     })
     .join('\n')
+  return { result: rewritten, alreadyRewritten }
 }
 
 export function rebindErrorStacktrace(e: Error, stacktrace: string): void {
@@ -94,8 +99,15 @@ export function ssrFixStacktrace(
   // stacktrace shouldn't be rewritten more than once
   if (rewroteStacktraces.has(e)) return
 
-  const stacktrace = ssrRewriteStacktrace(e.stack, moduleGraph)
+  const { result: stacktrace, alreadyRewritten } = ssrRewriteStacktrace(
+    e.stack,
+    moduleGraph,
+  )
   rebindErrorStacktrace(e, stacktrace)
+  if (alreadyRewritten) {
+    e.message +=
+      ' (The stacktrace appears to be already rewritten by something else, but was passed to vite.ssrFixStacktrace. This may cause incorrect stacktraces.)'
+  }
 
   rewroteStacktraces.add(e)
 }