From 27adca6701d44cf938ce57ebe4fa50262bfe62b4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 18 Dec 2025 03:03:03 +0000
Subject: [PATCH 01/16] Initial plan


From 76655725486253ac28d75a5717d00d25598c0074 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 18 Dec 2025 03:09:22 +0000
Subject: [PATCH 02/16] feat: add debug-dump example for issue 9290

Co-authored-by: hi-ogawa <4232207+hi-ogawa@users.noreply.github.com>
---
 examples/debug-dump/.gitignore                |   3 +
 examples/debug-dump/README.md                 | 116 ++++++++++++++++++
 examples/debug-dump/package.json              |  13 ++
 examples/debug-dump/src/utils/currency.ts     |   3 +
 examples/debug-dump/src/utils/index.ts        |   6 +
 examples/debug-dump/src/utils/location.ts     |   3 +
 examples/debug-dump/src/utils/math.ts         |   7 ++
 examples/debug-dump/src/utils/time.ts         |   3 +
 examples/debug-dump/src/utils/users.ts        |   3 +
 .../debug-dump/test/barrel-import.test.ts     |  10 ++
 .../debug-dump/test/direct-import.test.ts     |  10 ++
 examples/debug-dump/vitest.config.ts          |  13 ++
 pnpm-lock.yaml                                |   9 ++
 13 files changed, 199 insertions(+)
 create mode 100644 examples/debug-dump/.gitignore
 create mode 100644 examples/debug-dump/README.md
 create mode 100644 examples/debug-dump/package.json
 create mode 100644 examples/debug-dump/src/utils/currency.ts
 create mode 100644 examples/debug-dump/src/utils/index.ts
 create mode 100644 examples/debug-dump/src/utils/location.ts
 create mode 100644 examples/debug-dump/src/utils/math.ts
 create mode 100644 examples/debug-dump/src/utils/time.ts
 create mode 100644 examples/debug-dump/src/utils/users.ts
 create mode 100644 examples/debug-dump/test/barrel-import.test.ts
 create mode 100644 examples/debug-dump/test/direct-import.test.ts
 create mode 100644 examples/debug-dump/vitest.config.ts

diff --git a/examples/debug-dump/.gitignore b/examples/debug-dump/.gitignore
new file mode 100644
index 000000000000..1a3232fd0a10
--- /dev/null
+++ b/examples/debug-dump/.gitignore
@@ -0,0 +1,3 @@
+.vitest-dump
+node_modules
+coverage
diff --git a/examples/debug-dump/README.md b/examples/debug-dump/README.md
new file mode 100644
index 000000000000..86ffcaf51c69
--- /dev/null
+++ b/examples/debug-dump/README.md
@@ -0,0 +1,116 @@
+# VITEST_DEBUG_DUMP Example
+
+This example demonstrates the `VITEST_DEBUG_DUMP` feature for debugging file transformation issues in Vitest.
+
+Related to: https://github.com/vitest-dev/vitest/discussions/9290
+
+## What is VITEST_DEBUG_DUMP?
+
+`VITEST_DEBUG_DUMP` is an environment variable that enables Vitest to write transformed files to the filesystem. This is useful for:
+
+- Debugging barrel file issues
+- Understanding what files are being transformed
+- Inspecting the transformed code
+- Identifying unnecessary imports and transformations
+
+## File Structure
+
+```
+src/
+  utils/
+    currency.ts      - Currency formatting utility
+    time.ts          - Date formatting utility
+    math.ts          - Math utilities
+    location.ts      - Location utilities
+    users.ts         - User utilities
+    index.ts         - Barrel file (exports all utilities)
+test/
+  barrel-import.test.ts  - Test that imports from barrel file
+  direct-import.test.ts  - Test that imports directly
+```
+
+## Usage
+
+### Enable dump via environment variable (recommended):
+
+```bash
+VITEST_DEBUG_DUMP=true pnpm test
+```
+
+This will create a `.vitest-dump` folder in the project root with all transformed files.
+
+### Enable dump via config:
+
+Uncomment the configuration in `vitest.config.ts`:
+
+```ts
+export default defineConfig({
+  test: {
+    server: {
+      debug: {
+        dump: true,
+      },
+    },
+  },
+})
+```
+
+### Custom dump directory:
+
+```bash
+VITEST_DEBUG_DUMP=my-custom-dir pnpm test
+```
+
+Or in config:
+
+```ts
+export default defineConfig({
+  test: {
+    server: {
+      debug: {
+        dump: 'my-custom-dir',
+      },
+    },
+  },
+})
+```
+
+## Observing the Difference
+
+### Test with barrel import:
+
+```bash
+VITEST_DEBUG_DUMP=true pnpm test barrel-import
+```
+
+Check `.vitest-dump/` - you'll see that ALL files in the utils directory are transformed, even though only `currency.ts` is needed.
+
+### Test with direct import:
+
+```bash
+VITEST_DEBUG_DUMP=true pnpm test direct-import
+```
+
+Check `.vitest-dump/` - you'll see that ONLY the necessary files are transformed.
+
+## Expected Behavior
+
+When using the barrel file import (`../src/utils`):
+- ✅ All utility files are transformed (currency, time, math, location, users)
+- ⚠️ This causes unnecessary overhead
+
+When using direct imports (`../src/utils/currency`):
+- ✅ Only the needed file is transformed (currency)
+- ✅ Better performance
+
+## Debugging Tips
+
+1. Run tests with `VITEST_DEBUG_DUMP=true`
+2. Inspect the `.vitest-dump` directory
+3. Look for files that shouldn't be there
+4. Refactor imports to avoid barrel files where possible
+5. Use the Vitest UI to visualize the module graph
+
+## Clean Up
+
+The `.vitest-dump` directory is temporary and can be safely deleted or added to `.gitignore`.
diff --git a/examples/debug-dump/package.json b/examples/debug-dump/package.json
new file mode 100644
index 000000000000..e0a80596bd04
--- /dev/null
+++ b/examples/debug-dump/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "@vitest/example-debug-dump",
+  "type": "module",
+  "private": true,
+  "license": "MIT",
+  "scripts": {
+    "test": "vitest"
+  },
+  "devDependencies": {
+    "vite": "latest",
+    "vitest": "latest"
+  }
+}
diff --git a/examples/debug-dump/src/utils/currency.ts b/examples/debug-dump/src/utils/currency.ts
new file mode 100644
index 000000000000..45b18b592c54
--- /dev/null
+++ b/examples/debug-dump/src/utils/currency.ts
@@ -0,0 +1,3 @@
+export function formatCurrency(value: number): string {
+  return `$${value.toFixed(2)}`
+}
diff --git a/examples/debug-dump/src/utils/index.ts b/examples/debug-dump/src/utils/index.ts
new file mode 100644
index 000000000000..0c4159c261de
--- /dev/null
+++ b/examples/debug-dump/src/utils/index.ts
@@ -0,0 +1,6 @@
+// Barrel file - exports all utilities
+export * from './currency'
+export * from './time'
+export * from './math'
+export * from './location'
+export * from './users'
diff --git a/examples/debug-dump/src/utils/location.ts b/examples/debug-dump/src/utils/location.ts
new file mode 100644
index 000000000000..a76054adcbf4
--- /dev/null
+++ b/examples/debug-dump/src/utils/location.ts
@@ -0,0 +1,3 @@
+export function getLocation(lat: number, lng: number): string {
+  return `${lat},${lng}`
+}
diff --git a/examples/debug-dump/src/utils/math.ts b/examples/debug-dump/src/utils/math.ts
new file mode 100644
index 000000000000..fb76720eab58
--- /dev/null
+++ b/examples/debug-dump/src/utils/math.ts
@@ -0,0 +1,7 @@
+export function add(a: number, b: number): number {
+  return a + b
+}
+
+export function multiply(a: number, b: number): number {
+  return a * b
+}
diff --git a/examples/debug-dump/src/utils/time.ts b/examples/debug-dump/src/utils/time.ts
new file mode 100644
index 000000000000..8829a69e2cf2
--- /dev/null
+++ b/examples/debug-dump/src/utils/time.ts
@@ -0,0 +1,3 @@
+export function formatDate(date: Date): string {
+  return date.toISOString().split('T')[0]
+}
diff --git a/examples/debug-dump/src/utils/users.ts b/examples/debug-dump/src/utils/users.ts
new file mode 100644
index 000000000000..b52a49fb8254
--- /dev/null
+++ b/examples/debug-dump/src/utils/users.ts
@@ -0,0 +1,3 @@
+export function getUserName(firstName: string, lastName: string): string {
+  return `${firstName} ${lastName}`
+}
diff --git a/examples/debug-dump/test/barrel-import.test.ts b/examples/debug-dump/test/barrel-import.test.ts
new file mode 100644
index 000000000000..7fc832f714d9
--- /dev/null
+++ b/examples/debug-dump/test/barrel-import.test.ts
@@ -0,0 +1,10 @@
+import { describe, expect, test } from 'vitest'
+// Importing from barrel file - causes unnecessary transformations
+import { formatCurrency } from '../src/utils'
+
+describe('currency formatter (barrel import)', () => {
+  test('formats currency correctly', () => {
+    expect(formatCurrency(42.5)).toBe('$42.50')
+    expect(formatCurrency(100)).toBe('$100.00')
+  })
+})
diff --git a/examples/debug-dump/test/direct-import.test.ts b/examples/debug-dump/test/direct-import.test.ts
new file mode 100644
index 000000000000..95d61b7fa0b9
--- /dev/null
+++ b/examples/debug-dump/test/direct-import.test.ts
@@ -0,0 +1,10 @@
+import { describe, expect, test } from 'vitest'
+// Direct import - only transforms what's needed
+import { formatCurrency } from '../src/utils/currency'
+
+describe('currency formatter (direct import)', () => {
+  test('formats currency correctly', () => {
+    expect(formatCurrency(42.5)).toBe('$42.50')
+    expect(formatCurrency(100)).toBe('$100.00')
+  })
+})
diff --git a/examples/debug-dump/vitest.config.ts b/examples/debug-dump/vitest.config.ts
new file mode 100644
index 000000000000..b55e6fd4c229
--- /dev/null
+++ b/examples/debug-dump/vitest.config.ts
@@ -0,0 +1,13 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    // Enable dump to see transformed files
+    // You can also use VITEST_DEBUG_DUMP=true environment variable
+    // server: {
+    //   debug: {
+    //     dump: true,
+    //   },
+    // },
+  },
+})
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2103754dbee4..1bf9c6ccf1ed 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -318,6 +318,15 @@ importers:
         specifier: workspace:*
         version: link:../../packages/vitest
 
+  examples/debug-dump:
+    devDependencies:
+      vite:
+        specifier: ^7.1.5
+        version: 7.1.5(@types/node@24.10.1)(jiti@2.6.1)(lightningcss@1.30.1)(sass-embedded@1.93.3)(sass@1.93.3)(terser@5.44.0)(tsx@4.21.0)(yaml@2.8.2)
+      vitest:
+        specifier: workspace:*
+        version: link:../../packages/vitest
+
   examples/fastify:
     devDependencies:
       '@vitest/ui':

From 0d4abad49ddd482c73b73242a5332294ef345e06 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 18 Dec 2025 03:10:34 +0000
Subject: [PATCH 03/16] docs: update debug-dump README with actual test results

Co-authored-by: hi-ogawa <4232207+hi-ogawa@users.noreply.github.com>
---
 examples/debug-dump/README.md | 60 +++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 14 deletions(-)

diff --git a/examples/debug-dump/README.md b/examples/debug-dump/README.md
index 86ffcaf51c69..0636a07633a5 100644
--- a/examples/debug-dump/README.md
+++ b/examples/debug-dump/README.md
@@ -34,10 +34,10 @@ test/
 ### Enable dump via environment variable (recommended):
 
 ```bash
-VITEST_DEBUG_DUMP=true pnpm test
+VITEST_DEBUG_DUMP=true pnpm test --run
 ```
 
-This will create a `.vitest-dump` folder in the project root with all transformed files.
+This will create a `.vitest-dump/root/` folder in the project root with a `vitest-metadata.json` file containing information about transformed files.
 
 ### Enable dump via config:
 
@@ -80,36 +80,68 @@ export default defineConfig({
 ### Test with barrel import:
 
 ```bash
-VITEST_DEBUG_DUMP=true pnpm test barrel-import
+VITEST_DEBUG_DUMP=true pnpm test --run barrel-import
 ```
 
-Check `.vitest-dump/` - you'll see that ALL files in the utils directory are transformed, even though only `currency.ts` is needed.
+Check `.vitest-dump/root/vitest-metadata.json` - you'll see that ALL files in the utils directory are transformed:
+
+```json
+{
+  "outline": {
+    "externalized": 0,
+    "inlined": 7  // 7 files transformed!
+  },
+  "duration": {
+    "/test/barrel-import.test.ts": [...],
+    "/src/utils/index.ts": [...],        // barrel file
+    "/src/utils/currency.ts": [...],      // ✓ needed
+    "/src/utils/time.ts": [...],          // ✗ not needed
+    "/src/utils/math.ts": [...],          // ✗ not needed
+    "/src/utils/location.ts": [...],      // ✗ not needed
+    "/src/utils/users.ts": [...]          // ✗ not needed
+  }
+}
+```
 
 ### Test with direct import:
 
 ```bash
-VITEST_DEBUG_DUMP=true pnpm test direct-import
+VITEST_DEBUG_DUMP=true pnpm test --run direct-import
 ```
 
-Check `.vitest-dump/` - you'll see that ONLY the necessary files are transformed.
+Check `.vitest-dump/root/vitest-metadata.json` - you'll see that ONLY the necessary files are transformed:
+
+```json
+{
+  "outline": {
+    "externalized": 0,
+    "inlined": 2  // Only 2 files!
+  },
+  "duration": {
+    "/test/direct-import.test.ts": [...],
+    "/src/utils/currency.ts": [...]  // ✓ only what's needed
+  }
+}
+```
 
 ## Expected Behavior
 
 When using the barrel file import (`../src/utils`):
-- ✅ All utility files are transformed (currency, time, math, location, users)
-- ⚠️ This causes unnecessary overhead
+- ⚠️ All utility files are transformed (currency, time, math, location, users) = **7 files**
+- ⚠️ This causes unnecessary overhead and slower test execution
 
 When using direct imports (`../src/utils/currency`):
-- ✅ Only the needed file is transformed (currency)
-- ✅ Better performance
+- ✅ Only the needed file is transformed (currency) = **2 files** (test + source)
+- ✅ Better performance (71% fewer files transformed in this example)
 
 ## Debugging Tips
 
 1. Run tests with `VITEST_DEBUG_DUMP=true`
-2. Inspect the `.vitest-dump` directory
-3. Look for files that shouldn't be there
-4. Refactor imports to avoid barrel files where possible
-5. Use the Vitest UI to visualize the module graph
+2. Inspect the `.vitest-dump/root/vitest-metadata.json` file
+3. Look at the `"inlined"` count and `"duration"` entries to see which files were transformed
+4. Files that shouldn't be there indicate barrel file issues
+5. Refactor imports to avoid barrel files where possible
+6. Use the Vitest UI to visualize the module graph
 
 ## Clean Up
 

From 8ff96e7422691bf75b01705b6d6cdaf208778281 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 18 Dec 2025 03:12:36 +0000
Subject: [PATCH 04/16] style: apply linting fixes to debug-dump example

Co-authored-by: hi-ogawa <4232207+hi-ogawa@users.noreply.github.com>
---
 examples/debug-dump/README.md          | 22 +++++++++++-----------
 examples/debug-dump/src/utils/index.ts |  4 ++--
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/examples/debug-dump/README.md b/examples/debug-dump/README.md
index 0636a07633a5..fd5a3bec4279 100644
--- a/examples/debug-dump/README.md
+++ b/examples/debug-dump/README.md
@@ -89,16 +89,16 @@ Check `.vitest-dump/root/vitest-metadata.json` - you'll see that ALL files in th
 {
   "outline": {
     "externalized": 0,
-    "inlined": 7  // 7 files transformed!
+    "inlined": 7 // 7 files transformed!
   },
   "duration": {
-    "/test/barrel-import.test.ts": [...],
-    "/src/utils/index.ts": [...],        // barrel file
-    "/src/utils/currency.ts": [...],      // ✓ needed
-    "/src/utils/time.ts": [...],          // ✗ not needed
-    "/src/utils/math.ts": [...],          // ✗ not needed
-    "/src/utils/location.ts": [...],      // ✗ not needed
-    "/src/utils/users.ts": [...]          // ✗ not needed
+    "/test/barrel-import.test.ts": [/* timing data */],
+    "/src/utils/index.ts": [/* timing data */], // barrel file
+    "/src/utils/currency.ts": [/* timing data */], // ✓ needed
+    "/src/utils/time.ts": [/* timing data */], // ✗ not needed
+    "/src/utils/math.ts": [/* timing data */], // ✗ not needed
+    "/src/utils/location.ts": [/* timing data */], // ✗ not needed
+    "/src/utils/users.ts": [/* timing data */] // ✗ not needed
   }
 }
 ```
@@ -115,11 +115,11 @@ Check `.vitest-dump/root/vitest-metadata.json` - you'll see that ONLY the necess
 {
   "outline": {
     "externalized": 0,
-    "inlined": 2  // Only 2 files!
+    "inlined": 2 // Only 2 files!
   },
   "duration": {
-    "/test/direct-import.test.ts": [...],
-    "/src/utils/currency.ts": [...]  // ✓ only what's needed
+    "/test/direct-import.test.ts": [/* timing data */],
+    "/src/utils/currency.ts": [/* timing data */] // ✓ only what's needed
   }
 }
 ```
diff --git a/examples/debug-dump/src/utils/index.ts b/examples/debug-dump/src/utils/index.ts
index 0c4159c261de..1832528d56a6 100644
--- a/examples/debug-dump/src/utils/index.ts
+++ b/examples/debug-dump/src/utils/index.ts
@@ -1,6 +1,6 @@
 // Barrel file - exports all utilities
 export * from './currency'
-export * from './time'
-export * from './math'
 export * from './location'
+export * from './math'
+export * from './time'
 export * from './users'

From f75d236756dacdf1eeffa82eb367c0e7a7a359f4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 18 Dec 2025 03:19:41 +0000
Subject: [PATCH 05/16] feat: add repro for issue 9290 - spy mock coverage
 issue

Co-authored-by: hi-ogawa <4232207+hi-ogawa@users.noreply.github.com>
---
 examples/debug-dump/README.md                 | 148 ------------------
 examples/debug-dump/package.json              |  13 --
 examples/debug-dump/src/utils/currency.ts     |   3 -
 examples/debug-dump/src/utils/index.ts        |   6 -
 examples/debug-dump/src/utils/location.ts     |   3 -
 examples/debug-dump/src/utils/math.ts         |   7 -
 examples/debug-dump/src/utils/time.ts         |   3 -
 examples/debug-dump/src/utils/users.ts        |   3 -
 .../debug-dump/test/barrel-import.test.ts     |  10 --
 .../debug-dump/test/direct-import.test.ts     |  10 --
 examples/debug-dump/vitest.config.ts          |  13 --
 .../{debug-dump => repro-9290}/.gitignore     |   2 +-
 examples/repro-9290/README.md                 | 101 ++++++++++++
 examples/repro-9290/package.json              |  18 +++
 examples/repro-9290/src/module.ts             |   7 +
 examples/repro-9290/test/short.test.ts        |  11 ++
 examples/repro-9290/test/verbose.test.ts      |  17 ++
 examples/repro-9290/vitest.config.ts          |  11 ++
 pnpm-lock.yaml                                |  21 +--
 19 files changed, 178 insertions(+), 229 deletions(-)
 delete mode 100644 examples/debug-dump/README.md
 delete mode 100644 examples/debug-dump/package.json
 delete mode 100644 examples/debug-dump/src/utils/currency.ts
 delete mode 100644 examples/debug-dump/src/utils/index.ts
 delete mode 100644 examples/debug-dump/src/utils/location.ts
 delete mode 100644 examples/debug-dump/src/utils/math.ts
 delete mode 100644 examples/debug-dump/src/utils/time.ts
 delete mode 100644 examples/debug-dump/src/utils/users.ts
 delete mode 100644 examples/debug-dump/test/barrel-import.test.ts
 delete mode 100644 examples/debug-dump/test/direct-import.test.ts
 delete mode 100644 examples/debug-dump/vitest.config.ts
 rename examples/{debug-dump => repro-9290}/.gitignore (100%)
 create mode 100644 examples/repro-9290/README.md
 create mode 100644 examples/repro-9290/package.json
 create mode 100644 examples/repro-9290/src/module.ts
 create mode 100644 examples/repro-9290/test/short.test.ts
 create mode 100644 examples/repro-9290/test/verbose.test.ts
 create mode 100644 examples/repro-9290/vitest.config.ts

diff --git a/examples/debug-dump/README.md b/examples/debug-dump/README.md
deleted file mode 100644
index fd5a3bec4279..000000000000
--- a/examples/debug-dump/README.md
+++ /dev/null
@@ -1,148 +0,0 @@
-# VITEST_DEBUG_DUMP Example
-
-This example demonstrates the `VITEST_DEBUG_DUMP` feature for debugging file transformation issues in Vitest.
-
-Related to: https://github.com/vitest-dev/vitest/discussions/9290
-
-## What is VITEST_DEBUG_DUMP?
-
-`VITEST_DEBUG_DUMP` is an environment variable that enables Vitest to write transformed files to the filesystem. This is useful for:
-
-- Debugging barrel file issues
-- Understanding what files are being transformed
-- Inspecting the transformed code
-- Identifying unnecessary imports and transformations
-
-## File Structure
-
-```
-src/
-  utils/
-    currency.ts      - Currency formatting utility
-    time.ts          - Date formatting utility
-    math.ts          - Math utilities
-    location.ts      - Location utilities
-    users.ts         - User utilities
-    index.ts         - Barrel file (exports all utilities)
-test/
-  barrel-import.test.ts  - Test that imports from barrel file
-  direct-import.test.ts  - Test that imports directly
-```
-
-## Usage
-
-### Enable dump via environment variable (recommended):
-
-```bash
-VITEST_DEBUG_DUMP=true pnpm test --run
-```
-
-This will create a `.vitest-dump/root/` folder in the project root with a `vitest-metadata.json` file containing information about transformed files.
-
-### Enable dump via config:
-
-Uncomment the configuration in `vitest.config.ts`:
-
-```ts
-export default defineConfig({
-  test: {
-    server: {
-      debug: {
-        dump: true,
-      },
-    },
-  },
-})
-```
-
-### Custom dump directory:
-
-```bash
-VITEST_DEBUG_DUMP=my-custom-dir pnpm test
-```
-
-Or in config:
-
-```ts
-export default defineConfig({
-  test: {
-    server: {
-      debug: {
-        dump: 'my-custom-dir',
-      },
-    },
-  },
-})
-```
-
-## Observing the Difference
-
-### Test with barrel import:
-
-```bash
-VITEST_DEBUG_DUMP=true pnpm test --run barrel-import
-```
-
-Check `.vitest-dump/root/vitest-metadata.json` - you'll see that ALL files in the utils directory are transformed:
-
-```json
-{
-  "outline": {
-    "externalized": 0,
-    "inlined": 7 // 7 files transformed!
-  },
-  "duration": {
-    "/test/barrel-import.test.ts": [/* timing data */],
-    "/src/utils/index.ts": [/* timing data */], // barrel file
-    "/src/utils/currency.ts": [/* timing data */], // ✓ needed
-    "/src/utils/time.ts": [/* timing data */], // ✗ not needed
-    "/src/utils/math.ts": [/* timing data */], // ✗ not needed
-    "/src/utils/location.ts": [/* timing data */], // ✗ not needed
-    "/src/utils/users.ts": [/* timing data */] // ✗ not needed
-  }
-}
-```
-
-### Test with direct import:
-
-```bash
-VITEST_DEBUG_DUMP=true pnpm test --run direct-import
-```
-
-Check `.vitest-dump/root/vitest-metadata.json` - you'll see that ONLY the necessary files are transformed:
-
-```json
-{
-  "outline": {
-    "externalized": 0,
-    "inlined": 2 // Only 2 files!
-  },
-  "duration": {
-    "/test/direct-import.test.ts": [/* timing data */],
-    "/src/utils/currency.ts": [/* timing data */] // ✓ only what's needed
-  }
-}
-```
-
-## Expected Behavior
-
-When using the barrel file import (`../src/utils`):
-- ⚠️ All utility files are transformed (currency, time, math, location, users) = **7 files**
-- ⚠️ This causes unnecessary overhead and slower test execution
-
-When using direct imports (`../src/utils/currency`):
-- ✅ Only the needed file is transformed (currency) = **2 files** (test + source)
-- ✅ Better performance (71% fewer files transformed in this example)
-
-## Debugging Tips
-
-1. Run tests with `VITEST_DEBUG_DUMP=true`
-2. Inspect the `.vitest-dump/root/vitest-metadata.json` file
-3. Look at the `"inlined"` count and `"duration"` entries to see which files were transformed
-4. Files that shouldn't be there indicate barrel file issues
-5. Refactor imports to avoid barrel files where possible
-6. Use the Vitest UI to visualize the module graph
-
-## Clean Up
-
-The `.vitest-dump` directory is temporary and can be safely deleted or added to `.gitignore`.
diff --git a/examples/debug-dump/package.json b/examples/debug-dump/package.json
deleted file mode 100644
index e0a80596bd04..000000000000
--- a/examples/debug-dump/package.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "name": "@vitest/example-debug-dump",
-  "type": "module",
-  "private": true,
-  "license": "MIT",
-  "scripts": {
-    "test": "vitest"
-  },
-  "devDependencies": {
-    "vite": "latest",
-    "vitest": "latest"
-  }
-}
diff --git a/examples/debug-dump/src/utils/currency.ts b/examples/debug-dump/src/utils/currency.ts
deleted file mode 100644
index 45b18b592c54..000000000000
--- a/examples/debug-dump/src/utils/currency.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function formatCurrency(value: number): string {
-  return `$${value.toFixed(2)}`
-}
diff --git a/examples/debug-dump/src/utils/index.ts b/examples/debug-dump/src/utils/index.ts
deleted file mode 100644
index 1832528d56a6..000000000000
--- a/examples/debug-dump/src/utils/index.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-// Barrel file - exports all utilities
-export * from './currency'
-export * from './location'
-export * from './math'
-export * from './time'
-export * from './users'
diff --git a/examples/debug-dump/src/utils/location.ts b/examples/debug-dump/src/utils/location.ts
deleted file mode 100644
index a76054adcbf4..000000000000
--- a/examples/debug-dump/src/utils/location.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function getLocation(lat: number, lng: number): string {
-  return `${lat},${lng}`
-}
diff --git a/examples/debug-dump/src/utils/math.ts b/examples/debug-dump/src/utils/math.ts
deleted file mode 100644
index fb76720eab58..000000000000
--- a/examples/debug-dump/src/utils/math.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-export function add(a: number, b: number): number {
-  return a + b
-}
-
-export function multiply(a: number, b: number): number {
-  return a * b
-}
diff --git a/examples/debug-dump/src/utils/time.ts b/examples/debug-dump/src/utils/time.ts
deleted file mode 100644
index 8829a69e2cf2..000000000000
--- a/examples/debug-dump/src/utils/time.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function formatDate(date: Date): string {
-  return date.toISOString().split('T')[0]
-}
diff --git a/examples/debug-dump/src/utils/users.ts b/examples/debug-dump/src/utils/users.ts
deleted file mode 100644
index b52a49fb8254..000000000000
--- a/examples/debug-dump/src/utils/users.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function getUserName(firstName: string, lastName: string): string {
-  return `${firstName} ${lastName}`
-}
diff --git a/examples/debug-dump/test/barrel-import.test.ts b/examples/debug-dump/test/barrel-import.test.ts
deleted file mode 100644
index 7fc832f714d9..000000000000
--- a/examples/debug-dump/test/barrel-import.test.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { describe, expect, test } from 'vitest'
-// Importing from barrel file - causes unnecessary transformations
-import { formatCurrency } from '../src/utils'
-
-describe('currency formatter (barrel import)', () => {
-  test('formats currency correctly', () => {
-    expect(formatCurrency(42.5)).toBe('$42.50')
-    expect(formatCurrency(100)).toBe('$100.00')
-  })
-})
diff --git a/examples/debug-dump/test/direct-import.test.ts b/examples/debug-dump/test/direct-import.test.ts
deleted file mode 100644
index 95d61b7fa0b9..000000000000
--- a/examples/debug-dump/test/direct-import.test.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { describe, expect, test } from 'vitest'
-// Direct import - only transforms what's needed
-import { formatCurrency } from '../src/utils/currency'
-
-describe('currency formatter (direct import)', () => {
-  test('formats currency correctly', () => {
-    expect(formatCurrency(42.5)).toBe('$42.50')
-    expect(formatCurrency(100)).toBe('$100.00')
-  })
-})
diff --git a/examples/debug-dump/vitest.config.ts b/examples/debug-dump/vitest.config.ts
deleted file mode 100644
index b55e6fd4c229..000000000000
--- a/examples/debug-dump/vitest.config.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import { defineConfig } from 'vitest/config'
-
-export default defineConfig({
-  test: {
-    // Enable dump to see transformed files
-    // You can also use VITEST_DEBUG_DUMP=true environment variable
-    // server: {
-    //   debug: {
-    //     dump: true,
-    //   },
-    // },
-  },
-})
diff --git a/examples/debug-dump/.gitignore b/examples/repro-9290/.gitignore
similarity index 100%
rename from examples/debug-dump/.gitignore
rename to examples/repro-9290/.gitignore
index 1a3232fd0a10..e9d5142493d1 100644
--- a/examples/debug-dump/.gitignore
+++ b/examples/repro-9290/.gitignore
@@ -1,3 +1,3 @@
+coverage
 .vitest-dump
 node_modules
-coverage
diff --git a/examples/repro-9290/README.md b/examples/repro-9290/README.md
new file mode 100644
index 000000000000..326476df5f55
--- /dev/null
+++ b/examples/repro-9290/README.md
@@ -0,0 +1,101 @@
+# Reproduction for Issue 9290
+
+Related to: https://github.com/vitest-dev/vitest/discussions/9290
+
+## Problem
+
+When using `vi.mock('./module', { spy: true })`, coverage information is **not collected** for the mocked module. However, using the more verbose manual spy approach **does collect** coverage.
+
+This is problematic because both approaches execute the actual module code, so they should both collect coverage information.
+
+## File Structure
+
+```
+src/
+  module.ts              - Module to be mocked and tested
+test/
+  short.test.ts          - Uses { spy: true } (DOES NOT collect coverage ❌)
+  verbose.test.ts        - Uses manual spy setup (DOES collect coverage ✅)
+```
+
+## Reproduction Steps
+
+### 1. Run test with `{ spy: true }` approach
+
+```bash
+pnpm run coverage:short
+```
+
+**Expected**: Coverage should be collected for `src/module.ts`
+**Actual**: No coverage is collected ❌
+
+### 2. Run test with manual spy approach
+
+```bash
+pnpm run coverage:verbose
+```
+
+**Expected**: Coverage should be collected for `src/module.ts`
+**Actual**: Coverage IS collected ✅
+
+## The Issue
+
+### Approach 1: Using `{ spy: true }` (doesn't collect coverage)
+
+```ts
+import something from './module'
+
+vi.mock('./module', { spy: true })
+
+test('test', () => {
+  something(5) // Code executes but coverage is not collected ❌
+})
+```
+
+### Approach 2: Manual spy (does collect coverage)
+
+```ts
+import something from './module'
+
+vi.mock('./module', async () => {
+  const actual = await vi.importActual<typeof import('./module')>('./module')
+  return {
+    ...actual,
+    default: vi.spyOn(actual, 'default'),
+  }
+})
+
+test('test', () => {
+  something(5) // Code executes and coverage IS collected ✅
+})
+```
+
+## Expected Behavior
+
+Both approaches should collect coverage information since they both:
+1. Execute the actual module code
+2. Spy on the module's exports
+3. Allow the test to verify the code was called
+
+The `{ spy: true }` option is supposed to be a convenient shorthand for the manual spy approach, so they should behave identically with respect to coverage collection.
+
+## Impact
+
+This inconsistency means developers have to:
+- Use the more verbose approach to get accurate coverage reports
+- This defeats the purpose of the convenient `{ spy: true }` option
+- Coverage reports are inaccurate when using `{ spy: true }`
+- Developers may not realize their coverage is incomplete
+
+## Running the Example
+
+```bash
+# Run both tests normally
+pnpm test
+
+# Run with coverage to see the difference
+pnpm run coverage:short    # No coverage collected
+pnpm run coverage:verbose  # Coverage collected
+```
+
+Look at the coverage output to see that `src/module.ts` is only covered when using the verbose approach.
diff --git a/examples/repro-9290/package.json b/examples/repro-9290/package.json
new file mode 100644
index 000000000000..63dde445a2b9
--- /dev/null
+++ b/examples/repro-9290/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "@vitest/example-repro-9290",
+  "type": "module",
+  "private": true,
+  "license": "MIT",
+  "scripts": {
+    "test": "vitest",
+    "test:short": "vitest run short",
+    "test:verbose": "vitest run verbose",
+    "coverage:short": "vitest run short --coverage",
+    "coverage:verbose": "vitest run verbose --coverage"
+  },
+  "devDependencies": {
+    "@vitest/coverage-v8": "workspace:*",
+    "vite": "latest",
+    "vitest": "workspace:*"
+  }
+}
diff --git a/examples/repro-9290/src/module.ts b/examples/repro-9290/src/module.ts
new file mode 100644
index 000000000000..15bc974cef89
--- /dev/null
+++ b/examples/repro-9290/src/module.ts
@@ -0,0 +1,7 @@
+export default function myModule(value: number): number {
+  return value * 2
+}
+
+export function anotherFunction(value: number): number {
+  return value + 10
+}
diff --git a/examples/repro-9290/test/short.test.ts b/examples/repro-9290/test/short.test.ts
new file mode 100644
index 000000000000..f27147a51e90
--- /dev/null
+++ b/examples/repro-9290/test/short.test.ts
@@ -0,0 +1,11 @@
+import { expect, test, vi } from 'vitest'
+import something from '../src/module'
+
+// Using { spy: true } - this should collect coverage but currently doesn't
+vi.mock('../src/module', { spy: true })
+
+test('should spy on module and collect coverage with spy: true', () => {
+  const result = something(5)
+  expect(result).toBe(10)
+  expect(something).toHaveBeenCalledWith(5)
+})
diff --git a/examples/repro-9290/test/verbose.test.ts b/examples/repro-9290/test/verbose.test.ts
new file mode 100644
index 000000000000..415c620bf3fa
--- /dev/null
+++ b/examples/repro-9290/test/verbose.test.ts
@@ -0,0 +1,17 @@
+import { expect, test, vi } from 'vitest'
+import something from '../src/module'
+
+// Manual spy approach - this DOES collect coverage
+vi.mock('../src/module', async () => {
+  const actual = await vi.importActual<typeof import('../src/module')>('../src/module')
+  return {
+    ...actual,
+    default: vi.spyOn(actual, 'default'),
+  }
+})
+
+test('should spy on module and collect coverage with manual spy', () => {
+  const result = something(5)
+  expect(result).toBe(10)
+  expect(something).toHaveBeenCalledWith(5)
+})
diff --git a/examples/repro-9290/vitest.config.ts b/examples/repro-9290/vitest.config.ts
new file mode 100644
index 000000000000..de24dd39c727
--- /dev/null
+++ b/examples/repro-9290/vitest.config.ts
@@ -0,0 +1,11 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html', 'json'],
+      include: ['src/**/*.ts'],
+    },
+  },
+})
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1bf9c6ccf1ed..70b4c4356576 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -318,15 +318,6 @@ importers:
         specifier: workspace:*
         version: link:../../packages/vitest
 
-  examples/debug-dump:
-    devDependencies:
-      vite:
-        specifier: ^7.1.5
-        version: 7.1.5(@types/node@24.10.1)(jiti@2.6.1)(lightningcss@1.30.1)(sass-embedded@1.93.3)(sass@1.93.3)(terser@5.44.0)(tsx@4.21.0)(yaml@2.8.2)
-      vitest:
-        specifier: workspace:*
-        version: link:../../packages/vitest
-
   examples/fastify:
     devDependencies:
       '@vitest/ui':
@@ -445,6 +436,18 @@ importers:
         specifier: workspace:*
         version: link:../../packages/vitest
 
+  examples/repro-9290:
+    devDependencies:
+      '@vitest/coverage-v8':
+        specifier: workspace:*
+        version: link:../../packages/coverage-v8
+      vite:
+        specifier: ^7.1.5
+        version: 7.1.5(@types/node@24.10.1)(jiti@2.6.1)(lightningcss@1.30.1)(sass-embedded@1.93.3)(sass@1.93.3)(terser@5.44.0)(tsx@4.21.0)(yaml@2.8.2)
+      vitest:
+        specifier: workspace:*
+        version: link:../../packages/vitest
+
   examples/typecheck:
     devDependencies:
       '@types/node':

From 8507ab09f59ef5e96342f45e4e4b6fa15984f869 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 18 Dec 2025 03:24:20 +0000
Subject: [PATCH 06/16] docs: fix reference from issue to discussion in README

Co-authored-by: hi-ogawa <4232207+hi-ogawa@users.noreply.github.com>
---
 examples/repro-9290/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/repro-9290/README.md b/examples/repro-9290/README.md
index 326476df5f55..1c30746e2bb7 100644
--- a/examples/repro-9290/README.md
+++ b/examples/repro-9290/README.md
@@ -1,4 +1,4 @@
-# Reproduction for Issue 9290
+# Reproduction for Discussion 9290
 
 Related to: https://github.com/vitest-dev/vitest/discussions/9290
 

From a5b671b7e5a207cbb0693b827b39f781e148292a Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Wed, 28 Jan 2026 17:16:24 +0900
Subject: [PATCH 07/16] chore: lockfile

---
 pnpm-lock.yaml | 87 ++++++++++++++++++++++----------------------------
 1 file changed, 39 insertions(+), 48 deletions(-)

diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 16f066b3aa94..332f512172b1 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -476,8 +476,8 @@ importers:
         specifier: workspace:*
         version: link:../../packages/coverage-v8
       vite:
-        specifier: ^7.1.5
-        version: 7.1.5(@types/node@24.10.1)(jiti@2.6.1)(lightningcss@1.30.1)(sass-embedded@1.93.3)(sass@1.93.3)(terser@5.44.0)(tsx@4.21.0)(yaml@2.8.2)
+        specifier: 7.1.5
+        version: 7.1.5(@types/node@24.10.9)(jiti@2.6.1)(lightningcss@1.30.2)(sass-embedded@1.97.3)(sass@1.97.3)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2)
       vitest:
         specifier: workspace:*
         version: link:../../packages/vitest
@@ -10218,7 +10218,7 @@ snapshots:
 
   '@babel/helper-annotate-as-pure@7.27.3':
     dependencies:
-      '@babel/types': 7.28.5
+      '@babel/types': 7.28.6
 
   '@babel/helper-compilation-targets@7.27.2':
     dependencies:
@@ -10244,7 +10244,7 @@ snapshots:
       '@babel/helper-optimise-call-expression': 7.27.1
       '@babel/helper-replace-supers': 7.27.1(@babel/core@7.28.6)
       '@babel/helper-skip-transparent-expression-wrappers': 7.27.1
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
       semver: 6.3.1
     transitivePeerDependencies:
       - supports-color
@@ -10259,7 +10259,7 @@ snapshots:
   '@babel/helper-define-polyfill-provider@0.6.5(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-compilation-targets': 7.27.2
+      '@babel/helper-compilation-targets': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
       debug: 4.4.3
       lodash.debounce: 4.0.8
@@ -10271,8 +10271,8 @@ snapshots:
 
   '@babel/helper-member-expression-to-functions@7.28.5':
     dependencies:
-      '@babel/traverse': 7.28.5
-      '@babel/types': 7.28.5
+      '@babel/traverse': 7.28.6
+      '@babel/types': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10299,15 +10299,6 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  '@babel/helper-module-transforms@7.28.3(@babel/core@7.28.6)':
-    dependencies:
-      '@babel/core': 7.28.6
-      '@babel/helper-module-imports': 7.27.1
-      '@babel/helper-validator-identifier': 7.28.5
-      '@babel/traverse': 7.28.5
-    transitivePeerDependencies:
-      - supports-color
-
   '@babel/helper-module-transforms@7.28.6(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
@@ -10319,7 +10310,7 @@ snapshots:
 
   '@babel/helper-optimise-call-expression@7.27.1':
     dependencies:
-      '@babel/types': 7.28.5
+      '@babel/types': 7.28.6
 
   '@babel/helper-plugin-utils@7.27.1': {}
 
@@ -10328,7 +10319,7 @@ snapshots:
       '@babel/core': 7.28.6
       '@babel/helper-annotate-as-pure': 7.27.3
       '@babel/helper-wrap-function': 7.28.3
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10337,14 +10328,14 @@ snapshots:
       '@babel/core': 7.28.6
       '@babel/helper-member-expression-to-functions': 7.28.5
       '@babel/helper-optimise-call-expression': 7.27.1
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
   '@babel/helper-skip-transparent-expression-wrappers@7.27.1':
     dependencies:
-      '@babel/traverse': 7.28.5
-      '@babel/types': 7.28.5
+      '@babel/traverse': 7.28.6
+      '@babel/types': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10358,9 +10349,9 @@ snapshots:
 
   '@babel/helper-wrap-function@7.28.3':
     dependencies:
-      '@babel/template': 7.27.2
-      '@babel/traverse': 7.28.5
-      '@babel/types': 7.28.5
+      '@babel/template': 7.28.6
+      '@babel/traverse': 7.28.6
+      '@babel/types': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10394,7 +10385,7 @@ snapshots:
     dependencies:
       '@babel/core': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10421,7 +10412,7 @@ snapshots:
     dependencies:
       '@babel/core': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10455,14 +10446,14 @@ snapshots:
       '@babel/core': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
       '@babel/helper-remap-async-to-generator': 7.27.1(@babel/core@7.28.6)
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
   '@babel/plugin-transform-async-to-generator@7.27.1(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-module-imports': 7.27.1
+      '@babel/helper-module-imports': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
       '@babel/helper-remap-async-to-generator': 7.27.1(@babel/core@7.28.6)
     transitivePeerDependencies:
@@ -10498,11 +10489,11 @@ snapshots:
     dependencies:
       '@babel/core': 7.28.6
       '@babel/helper-annotate-as-pure': 7.27.3
-      '@babel/helper-compilation-targets': 7.27.2
+      '@babel/helper-compilation-targets': 7.28.6
       '@babel/helper-globals': 7.28.0
       '@babel/helper-plugin-utils': 7.27.1
       '@babel/helper-replace-supers': 7.27.1(@babel/core@7.28.6)
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10510,13 +10501,13 @@ snapshots:
     dependencies:
       '@babel/core': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
-      '@babel/template': 7.27.2
+      '@babel/template': 7.28.6
 
   '@babel/plugin-transform-destructuring@7.28.5(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10571,9 +10562,9 @@ snapshots:
   '@babel/plugin-transform-function-name@7.27.1(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-compilation-targets': 7.27.2
+      '@babel/helper-compilation-targets': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10600,7 +10591,7 @@ snapshots:
   '@babel/plugin-transform-modules-amd@7.27.1(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-module-transforms': 7.28.3(@babel/core@7.28.6)
+      '@babel/helper-module-transforms': 7.28.6(@babel/core@7.28.6)
       '@babel/helper-plugin-utils': 7.27.1
     transitivePeerDependencies:
       - supports-color
@@ -10608,7 +10599,7 @@ snapshots:
   '@babel/plugin-transform-modules-commonjs@7.27.1(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-module-transforms': 7.28.3(@babel/core@7.28.6)
+      '@babel/helper-module-transforms': 7.28.6(@babel/core@7.28.6)
       '@babel/helper-plugin-utils': 7.27.1
     transitivePeerDependencies:
       - supports-color
@@ -10616,17 +10607,17 @@ snapshots:
   '@babel/plugin-transform-modules-systemjs@7.28.5(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-module-transforms': 7.28.3(@babel/core@7.28.6)
+      '@babel/helper-module-transforms': 7.28.6(@babel/core@7.28.6)
       '@babel/helper-plugin-utils': 7.27.1
       '@babel/helper-validator-identifier': 7.28.5
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
   '@babel/plugin-transform-modules-umd@7.27.1(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-module-transforms': 7.28.3(@babel/core@7.28.6)
+      '@babel/helper-module-transforms': 7.28.6(@babel/core@7.28.6)
       '@babel/helper-plugin-utils': 7.27.1
     transitivePeerDependencies:
       - supports-color
@@ -10655,11 +10646,11 @@ snapshots:
   '@babel/plugin-transform-object-rest-spread@7.28.4(@babel/core@7.28.6)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-compilation-targets': 7.27.2
+      '@babel/helper-compilation-targets': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
       '@babel/plugin-transform-destructuring': 7.28.5(@babel/core@7.28.6)
       '@babel/plugin-transform-parameters': 7.27.7(@babel/core@7.28.6)
-      '@babel/traverse': 7.28.5
+      '@babel/traverse': 7.28.6
     transitivePeerDependencies:
       - supports-color
 
@@ -10790,9 +10781,9 @@ snapshots:
 
   '@babel/preset-env@7.28.5(@babel/core@7.28.6)':
     dependencies:
-      '@babel/compat-data': 7.28.5
+      '@babel/compat-data': 7.28.6
       '@babel/core': 7.28.6
-      '@babel/helper-compilation-targets': 7.27.2
+      '@babel/helper-compilation-targets': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
       '@babel/helper-validator-option': 7.27.1
       '@babel/plugin-bugfix-firefox-class-in-computed-class-key': 7.28.5(@babel/core@7.28.6)
@@ -10868,7 +10859,7 @@ snapshots:
     dependencies:
       '@babel/core': 7.28.6
       '@babel/helper-plugin-utils': 7.27.1
-      '@babel/types': 7.28.5
+      '@babel/types': 7.28.6
       esutils: 2.0.3
 
   '@babel/runtime@7.26.0':
@@ -12411,7 +12402,7 @@ snapshots:
   '@rollup/plugin-babel@5.3.1(@babel/core@7.28.6)(@types/babel__core@7.20.5)(rollup@4.56.0)':
     dependencies:
       '@babel/core': 7.28.6
-      '@babel/helper-module-imports': 7.27.1
+      '@babel/helper-module-imports': 7.28.6
       '@rollup/pluginutils': 3.1.0(rollup@4.56.0)
       rollup: 4.56.0
     optionalDependencies:
@@ -13826,7 +13817,7 @@ snapshots:
 
   babel-plugin-polyfill-corejs2@0.4.14(@babel/core@7.28.6):
     dependencies:
-      '@babel/compat-data': 7.28.5
+      '@babel/compat-data': 7.28.6
       '@babel/core': 7.28.6
       '@babel/helper-define-polyfill-provider': 0.6.5(@babel/core@7.28.6)
       semver: 6.3.1
@@ -16258,8 +16249,8 @@ snapshots:
 
   magicast@0.3.5:
     dependencies:
-      '@babel/parser': 7.28.5
-      '@babel/types': 7.28.5
+      '@babel/parser': 7.28.6
+      '@babel/types': 7.28.6
       source-map-js: 1.2.1
     optional: true
 

From e1730f0c3ed1c4e721ef8f904eef75a7d8cf9744 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Wed, 28 Jan 2026 17:56:47 +0900
Subject: [PATCH 08/16] fix: fix coverage of `vi.mock({ spy: true })` module

---
 packages/vitest/src/runtime/moduleRunner/moduleEvaluator.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/vitest/src/runtime/moduleRunner/moduleEvaluator.ts b/packages/vitest/src/runtime/moduleRunner/moduleEvaluator.ts
index f5e45ea53306..76fb1ed4c1d6 100644
--- a/packages/vitest/src/runtime/moduleRunner/moduleEvaluator.ts
+++ b/packages/vitest/src/runtime/moduleRunner/moduleEvaluator.ts
@@ -315,7 +315,8 @@ export class VitestModuleEvaluator implements ModuleEvaluator {
     )})=>{{`
     const wrappedCode = `${codeDefinition}${code}\n}}`
     const options = {
-      filename: module.id,
+      // use original id for auto spy module (vi.mock(..., { spy: true }))
+      filename: module.id.startsWith('mock:') ? module.id.slice(5) : module.id,
       lineOffset: 0,
       columnOffset: -codeDefinition.length,
     }

From 44de34f186f0e37a93f988a29abb51b47293f34e Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Wed, 28 Jan 2026 19:23:02 +0900
Subject: [PATCH 09/16] test(coverage): add test for `vi.mock({ spy: true })`
 coverage

Verifies that coverage is properly collected for modules mocked with
`vi.mock({ spy: true })` (#9290).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../fixtures/src/autospy-target.ts            |  7 ++++
 .../fixtures/test/autospy-fixture.test.ts     | 10 +++++
 test/coverage-test/test/autospy.test.ts       | 41 +++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 test/coverage-test/fixtures/src/autospy-target.ts
 create mode 100644 test/coverage-test/fixtures/test/autospy-fixture.test.ts
 create mode 100644 test/coverage-test/test/autospy.test.ts

diff --git a/test/coverage-test/fixtures/src/autospy-target.ts b/test/coverage-test/fixtures/src/autospy-target.ts
new file mode 100644
index 000000000000..bf28b98258e0
--- /dev/null
+++ b/test/coverage-test/fixtures/src/autospy-target.ts
@@ -0,0 +1,7 @@
+export function double(value: number): number {
+  return value * 2
+}
+
+export function triple(value: number): number {
+  return value * 3
+}
diff --git a/test/coverage-test/fixtures/test/autospy-fixture.test.ts b/test/coverage-test/fixtures/test/autospy-fixture.test.ts
new file mode 100644
index 000000000000..510563759a79
--- /dev/null
+++ b/test/coverage-test/fixtures/test/autospy-fixture.test.ts
@@ -0,0 +1,10 @@
+import { expect, test, vi } from 'vitest'
+import { double, triple } from '../src/autospy-target'
+
+vi.mock('../src/autospy-target', { spy: true })
+
+test('autospy calls original and can be spied on', () => {
+  expect(double(5)).toBe(10)
+  expect(double).toHaveBeenCalledWith(5)
+  expect(triple).not.toHaveBeenCalled()
+})
diff --git a/test/coverage-test/test/autospy.test.ts b/test/coverage-test/test/autospy.test.ts
new file mode 100644
index 000000000000..e9a6c79d73c5
--- /dev/null
+++ b/test/coverage-test/test/autospy.test.ts
@@ -0,0 +1,41 @@
+import { expect } from 'vitest'
+import { readCoverageMap, runVitest, test } from '../utils'
+
+// TODO: browser mode?
+test('vi.mock({ spy: true }) collects coverage (#9290)', async () => {
+  await runVitest({
+    include: ['fixtures/test/autospy-fixture.test.ts'],
+    coverage: {
+      reporter: 'json',
+      include: ['fixtures/src/autospy-target.ts'],
+    },
+  })
+
+  const coverageMap = await readCoverageMap()
+  expect(coverageMap).toMatchInlineSnapshot(`
+    {
+      "branches": "0/0 (100%)",
+      "functions": "1/2 (50%)",
+      "lines": "1/2 (50%)",
+      "statements": "1/2 (50%)",
+    }
+  `)
+
+  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/autospy-target.ts')
+  const functionCoverage = Object.keys(coverage.fnMap)
+    .map(index => ({ name: coverage.fnMap[index].name, hits: coverage.f[index] }))
+    .sort((a, b) => a.name.localeCompare(b.name))
+
+  expect(functionCoverage).toMatchInlineSnapshot(`
+    [
+      {
+        "hits": 1,
+        "name": "double",
+      },
+      {
+        "hits": 0,
+        "name": "triple",
+      },
+    ]
+  `)
+})

From 0a0043b2b7dd27e28a993b05471b02f2823adc13 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:03:39 +0900
Subject: [PATCH 10/16] test: tweak

---
 .../src/{autospy-target.ts => mock-autospy-target.ts}       | 0
 ...autospy-fixture.test.ts => mock-autospy-fixture.test.ts} | 4 ++--
 .../test/{autospy.test.ts => mock-autospy.test.ts}          | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)
 rename test/coverage-test/fixtures/src/{autospy-target.ts => mock-autospy-target.ts} (100%)
 rename test/coverage-test/fixtures/test/{autospy-fixture.test.ts => mock-autospy-fixture.test.ts} (64%)
 rename test/coverage-test/test/{autospy.test.ts => mock-autospy.test.ts} (86%)

diff --git a/test/coverage-test/fixtures/src/autospy-target.ts b/test/coverage-test/fixtures/src/mock-autospy-target.ts
similarity index 100%
rename from test/coverage-test/fixtures/src/autospy-target.ts
rename to test/coverage-test/fixtures/src/mock-autospy-target.ts
diff --git a/test/coverage-test/fixtures/test/autospy-fixture.test.ts b/test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts
similarity index 64%
rename from test/coverage-test/fixtures/test/autospy-fixture.test.ts
rename to test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts
index 510563759a79..340e10d796c5 100644
--- a/test/coverage-test/fixtures/test/autospy-fixture.test.ts
+++ b/test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts
@@ -1,7 +1,7 @@
 import { expect, test, vi } from 'vitest'
-import { double, triple } from '../src/autospy-target'
+import { double, triple } from '../src/mock-autospy-target'
 
-vi.mock('../src/autospy-target', { spy: true })
+vi.mock(import('../src/mock-autospy-target'), { spy: true })
 
 test('autospy calls original and can be spied on', () => {
   expect(double(5)).toBe(10)
diff --git a/test/coverage-test/test/autospy.test.ts b/test/coverage-test/test/mock-autospy.test.ts
similarity index 86%
rename from test/coverage-test/test/autospy.test.ts
rename to test/coverage-test/test/mock-autospy.test.ts
index e9a6c79d73c5..3388d61fca77 100644
--- a/test/coverage-test/test/autospy.test.ts
+++ b/test/coverage-test/test/mock-autospy.test.ts
@@ -4,10 +4,10 @@ import { readCoverageMap, runVitest, test } from '../utils'
 // TODO: browser mode?
 test('vi.mock({ spy: true }) collects coverage (#9290)', async () => {
   await runVitest({
-    include: ['fixtures/test/autospy-fixture.test.ts'],
+    include: ['fixtures/test/mock-autospy-fixture.test.ts'],
     coverage: {
       reporter: 'json',
-      include: ['fixtures/src/autospy-target.ts'],
+      include: ['fixtures/src/mock-autospy-target.ts'],
     },
   })
 
@@ -21,7 +21,7 @@ test('vi.mock({ spy: true }) collects coverage (#9290)', async () => {
     }
   `)
 
-  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/autospy-target.ts')
+  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/mock-autospy-target.ts')
   const functionCoverage = Object.keys(coverage.fnMap)
     .map(index => ({ name: coverage.fnMap[index].name, hits: coverage.f[index] }))
     .sort((a, b) => a.name.localeCompare(b.name))

From 49f1589f7d06e9efca23914a2ca396324ab98350 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:06:31 +0900
Subject: [PATCH 11/16] test: browser mode

---
 test/coverage-test/test/mock-autospy.test.ts | 3 +--
 test/coverage-test/vitest.config.ts          | 2 ++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/coverage-test/test/mock-autospy.test.ts b/test/coverage-test/test/mock-autospy.test.ts
index 3388d61fca77..a9dcc640f417 100644
--- a/test/coverage-test/test/mock-autospy.test.ts
+++ b/test/coverage-test/test/mock-autospy.test.ts
@@ -1,8 +1,7 @@
 import { expect } from 'vitest'
 import { readCoverageMap, runVitest, test } from '../utils'
 
-// TODO: browser mode?
-test('vi.mock({ spy: true }) collects coverage (#9290)', async () => {
+test('vi.mock({ spy: true }) collects coverage of original module', async () => {
   await runVitest({
     include: ['fixtures/test/mock-autospy-fixture.test.ts'],
     coverage: {
diff --git a/test/coverage-test/vitest.config.ts b/test/coverage-test/vitest.config.ts
index f75455f42e3b..62ff870256ef 100644
--- a/test/coverage-test/vitest.config.ts
+++ b/test/coverage-test/vitest.config.ts
@@ -90,6 +90,7 @@ export default defineConfig({
             '**/query-param-transforms.test.ts',
             '**/test/cjs-dependency.test.ts',
             '**/test/source-maps.test.ts',
+            '**/test/mock-autospy.test.ts',
           ],
           exclude: [FIXTURES],
         },
@@ -122,6 +123,7 @@ export default defineConfig({
             '**/query-param-transforms.test.ts',
             '**/test/cjs-dependency.test.ts',
             '**/test/source-maps.test.ts',
+            '**/test/mock-autospy.test.ts',
           ],
           exclude: [FIXTURES],
         },

From 7715581595533ed86f1c7269bfa6256777913c85 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:36:28 +0900
Subject: [PATCH 12/16] test(coverage): add mock-importActual test for coverage
 verification

Add a parallel test using vi.mock with importOriginal callback to verify
coverage collection works similarly to vi.mock({ spy: true }).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 ...{mock-autospy-target.ts => mock-target.ts} |  0
 .../test/mock-autospy-fixture.test.ts         |  4 +-
 .../test/mock-importActual-fixture.test.ts    | 17 ++++++++
 test/coverage-test/test/mock-autospy.test.ts  |  4 +-
 .../test/mock-importActual.test.ts            | 40 +++++++++++++++++++
 5 files changed, 61 insertions(+), 4 deletions(-)
 rename test/coverage-test/fixtures/src/{mock-autospy-target.ts => mock-target.ts} (100%)
 create mode 100644 test/coverage-test/fixtures/test/mock-importActual-fixture.test.ts
 create mode 100644 test/coverage-test/test/mock-importActual.test.ts

diff --git a/test/coverage-test/fixtures/src/mock-autospy-target.ts b/test/coverage-test/fixtures/src/mock-target.ts
similarity index 100%
rename from test/coverage-test/fixtures/src/mock-autospy-target.ts
rename to test/coverage-test/fixtures/src/mock-target.ts
diff --git a/test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts b/test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts
index 340e10d796c5..9a0c310f3331 100644
--- a/test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts
+++ b/test/coverage-test/fixtures/test/mock-autospy-fixture.test.ts
@@ -1,7 +1,7 @@
 import { expect, test, vi } from 'vitest'
-import { double, triple } from '../src/mock-autospy-target'
+import { double, triple } from '../src/mock-target'
 
-vi.mock(import('../src/mock-autospy-target'), { spy: true })
+vi.mock(import('../src/mock-target'), { spy: true })
 
 test('autospy calls original and can be spied on', () => {
   expect(double(5)).toBe(10)
diff --git a/test/coverage-test/fixtures/test/mock-importActual-fixture.test.ts b/test/coverage-test/fixtures/test/mock-importActual-fixture.test.ts
new file mode 100644
index 000000000000..8f00072ba67e
--- /dev/null
+++ b/test/coverage-test/fixtures/test/mock-importActual-fixture.test.ts
@@ -0,0 +1,17 @@
+import { expect, test, vi } from 'vitest'
+import { double, triple } from '../src/mock-target'
+
+// Manual spy approach using importOriginal callback - this collects coverage
+vi.mock(import('../src/mock-target'), async (importOriginal) => {
+  const actual = await importOriginal()
+  return {
+    double: vi.fn(actual.double),
+    triple: vi.fn(actual.triple),
+  }
+})
+
+test('importActual calls original and can be spied on', () => {
+  expect(double(5)).toBe(10)
+  expect(double).toHaveBeenCalledWith(5)
+  expect(triple).not.toHaveBeenCalled()
+})
diff --git a/test/coverage-test/test/mock-autospy.test.ts b/test/coverage-test/test/mock-autospy.test.ts
index a9dcc640f417..2c96964dbec7 100644
--- a/test/coverage-test/test/mock-autospy.test.ts
+++ b/test/coverage-test/test/mock-autospy.test.ts
@@ -6,7 +6,7 @@ test('vi.mock({ spy: true }) collects coverage of original module', async () =>
     include: ['fixtures/test/mock-autospy-fixture.test.ts'],
     coverage: {
       reporter: 'json',
-      include: ['fixtures/src/mock-autospy-target.ts'],
+      include: ['fixtures/src/mock-target.ts'],
     },
   })
 
@@ -20,7 +20,7 @@ test('vi.mock({ spy: true }) collects coverage of original module', async () =>
     }
   `)
 
-  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/mock-autospy-target.ts')
+  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/mock-target.ts')
   const functionCoverage = Object.keys(coverage.fnMap)
     .map(index => ({ name: coverage.fnMap[index].name, hits: coverage.f[index] }))
     .sort((a, b) => a.name.localeCompare(b.name))
diff --git a/test/coverage-test/test/mock-importActual.test.ts b/test/coverage-test/test/mock-importActual.test.ts
new file mode 100644
index 000000000000..2c7d27c3acbf
--- /dev/null
+++ b/test/coverage-test/test/mock-importActual.test.ts
@@ -0,0 +1,40 @@
+import { expect } from 'vitest'
+import { readCoverageMap, runVitest, test } from '../utils'
+
+test('vi.importActual() collects coverage of original module', async () => {
+  await runVitest({
+    include: ['fixtures/test/mock-importActual-fixture.test.ts'],
+    coverage: {
+      reporter: 'json',
+      include: ['fixtures/src/mock-target.ts'],
+    },
+  })
+
+  const coverageMap = await readCoverageMap()
+  expect(coverageMap).toMatchInlineSnapshot(`
+    {
+      "branches": "0/0 (100%)",
+      "functions": "1/2 (50%)",
+      "lines": "1/2 (50%)",
+      "statements": "1/2 (50%)",
+    }
+  `)
+
+  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/mock-target.ts')
+  const functionCoverage = Object.keys(coverage.fnMap)
+    .map(index => ({ name: coverage.fnMap[index].name, hits: coverage.f[index] }))
+    .sort((a, b) => a.name.localeCompare(b.name))
+
+  expect(functionCoverage).toMatchInlineSnapshot(`
+    [
+      {
+        "hits": 1,
+        "name": "double",
+      },
+      {
+        "hits": 0,
+        "name": "triple",
+      },
+    ]
+  `)
+})

From 7320efa512c78d4026ea00d068d37b47b288141c Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:44:37 +0900
Subject: [PATCH 13/16] chore: repro

---
 examples/repro-9290/test/short.test.ts   | 2 +-
 examples/repro-9290/test/verbose.test.ts | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/repro-9290/test/short.test.ts b/examples/repro-9290/test/short.test.ts
index f27147a51e90..11a667c80a9f 100644
--- a/examples/repro-9290/test/short.test.ts
+++ b/examples/repro-9290/test/short.test.ts
@@ -2,7 +2,7 @@ import { expect, test, vi } from 'vitest'
 import something from '../src/module'
 
 // Using { spy: true } - this should collect coverage but currently doesn't
-vi.mock('../src/module', { spy: true })
+vi.mock(import('../src/module'), { spy: true })
 
 test('should spy on module and collect coverage with spy: true', () => {
   const result = something(5)
diff --git a/examples/repro-9290/test/verbose.test.ts b/examples/repro-9290/test/verbose.test.ts
index 415c620bf3fa..96ac2e6576d4 100644
--- a/examples/repro-9290/test/verbose.test.ts
+++ b/examples/repro-9290/test/verbose.test.ts
@@ -2,8 +2,8 @@ import { expect, test, vi } from 'vitest'
 import something from '../src/module'
 
 // Manual spy approach - this DOES collect coverage
-vi.mock('../src/module', async () => {
-  const actual = await vi.importActual<typeof import('../src/module')>('../src/module')
+vi.mock(import('../src/module'), async (importOriginal) => {
+  const actual = await importOriginal()
   return {
     ...actual,
     default: vi.spyOn(actual, 'default'),

From dedaa93a3ad76c3418a842c6764e5f2ab90032e1 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:45:00 +0900
Subject: [PATCH 14/16] chore: remove examples/repro-9290

---
 examples/repro-9290/.gitignore           |   3 -
 examples/repro-9290/README.md            | 101 -----------------------
 examples/repro-9290/package.json         |  18 ----
 examples/repro-9290/src/module.ts        |   7 --
 examples/repro-9290/test/short.test.ts   |  11 ---
 examples/repro-9290/test/verbose.test.ts |  17 ----
 examples/repro-9290/vitest.config.ts     |  11 ---
 pnpm-lock.yaml                           |  12 ---
 8 files changed, 180 deletions(-)
 delete mode 100644 examples/repro-9290/.gitignore
 delete mode 100644 examples/repro-9290/README.md
 delete mode 100644 examples/repro-9290/package.json
 delete mode 100644 examples/repro-9290/src/module.ts
 delete mode 100644 examples/repro-9290/test/short.test.ts
 delete mode 100644 examples/repro-9290/test/verbose.test.ts
 delete mode 100644 examples/repro-9290/vitest.config.ts

diff --git a/examples/repro-9290/.gitignore b/examples/repro-9290/.gitignore
deleted file mode 100644
index e9d5142493d1..000000000000
--- a/examples/repro-9290/.gitignore
+++ /dev/null
@@ -1,3 +0,0 @@
-coverage
-.vitest-dump
-node_modules
diff --git a/examples/repro-9290/README.md b/examples/repro-9290/README.md
deleted file mode 100644
index 1c30746e2bb7..000000000000
--- a/examples/repro-9290/README.md
+++ /dev/null
@@ -1,101 +0,0 @@
-# Reproduction for Discussion 9290
-
-Related to: https://github.com/vitest-dev/vitest/discussions/9290
-
-## Problem
-
-When using `vi.mock('./module', { spy: true })`, coverage information is **not collected** for the mocked module. However, using the more verbose manual spy approach **does collect** coverage.
-
-This is problematic because both approaches execute the actual module code, so they should both collect coverage information.
-
-## File Structure
-
-```
-src/
-  module.ts              - Module to be mocked and tested
-test/
-  short.test.ts          - Uses { spy: true } (DOES NOT collect coverage ❌)
-  verbose.test.ts        - Uses manual spy setup (DOES collect coverage ✅)
-```
-
-## Reproduction Steps
-
-### 1. Run test with `{ spy: true }` approach
-
-```bash
-pnpm run coverage:short
-```
-
-**Expected**: Coverage should be collected for `src/module.ts`
-**Actual**: No coverage is collected ❌
-
-### 2. Run test with manual spy approach
-
-```bash
-pnpm run coverage:verbose
-```
-
-**Expected**: Coverage should be collected for `src/module.ts`
-**Actual**: Coverage IS collected ✅
-
-## The Issue
-
-### Approach 1: Using `{ spy: true }` (doesn't collect coverage)
-
-```ts
-import something from './module'
-
-vi.mock('./module', { spy: true })
-
-test('test', () => {
-  something(5) // Code executes but coverage is not collected ❌
-})
-```
-
-### Approach 2: Manual spy (does collect coverage)
-
-```ts
-import something from './module'
-
-vi.mock('./module', async () => {
-  const actual = await vi.importActual<typeof import('./module')>('./module')
-  return {
-    ...actual,
-    default: vi.spyOn(actual, 'default'),
-  }
-})
-
-test('test', () => {
-  something(5) // Code executes and coverage IS collected ✅
-})
-```
-
-## Expected Behavior
-
-Both approaches should collect coverage information since they both:
-1. Execute the actual module code
-2. Spy on the module's exports
-3. Allow the test to verify the code was called
-
-The `{ spy: true }` option is supposed to be a convenient shorthand for the manual spy approach, so they should behave identically with respect to coverage collection.
-
-## Impact
-
-This inconsistency means developers have to:
-- Use the more verbose approach to get accurate coverage reports
-- This defeats the purpose of the convenient `{ spy: true }` option
-- Coverage reports are inaccurate when using `{ spy: true }`
-- Developers may not realize their coverage is incomplete
-
-## Running the Example
-
-```bash
-# Run both tests normally
-pnpm test
-
-# Run with coverage to see the difference
-pnpm run coverage:short    # No coverage collected
-pnpm run coverage:verbose  # Coverage collected
-```
-
-Look at the coverage output to see that `src/module.ts` is only covered when using the verbose approach.
diff --git a/examples/repro-9290/package.json b/examples/repro-9290/package.json
deleted file mode 100644
index 63dde445a2b9..000000000000
--- a/examples/repro-9290/package.json
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "name": "@vitest/example-repro-9290",
-  "type": "module",
-  "private": true,
-  "license": "MIT",
-  "scripts": {
-    "test": "vitest",
-    "test:short": "vitest run short",
-    "test:verbose": "vitest run verbose",
-    "coverage:short": "vitest run short --coverage",
-    "coverage:verbose": "vitest run verbose --coverage"
-  },
-  "devDependencies": {
-    "@vitest/coverage-v8": "workspace:*",
-    "vite": "latest",
-    "vitest": "workspace:*"
-  }
-}
diff --git a/examples/repro-9290/src/module.ts b/examples/repro-9290/src/module.ts
deleted file mode 100644
index 15bc974cef89..000000000000
--- a/examples/repro-9290/src/module.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-export default function myModule(value: number): number {
-  return value * 2
-}
-
-export function anotherFunction(value: number): number {
-  return value + 10
-}
diff --git a/examples/repro-9290/test/short.test.ts b/examples/repro-9290/test/short.test.ts
deleted file mode 100644
index 11a667c80a9f..000000000000
--- a/examples/repro-9290/test/short.test.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { expect, test, vi } from 'vitest'
-import something from '../src/module'
-
-// Using { spy: true } - this should collect coverage but currently doesn't
-vi.mock(import('../src/module'), { spy: true })
-
-test('should spy on module and collect coverage with spy: true', () => {
-  const result = something(5)
-  expect(result).toBe(10)
-  expect(something).toHaveBeenCalledWith(5)
-})
diff --git a/examples/repro-9290/test/verbose.test.ts b/examples/repro-9290/test/verbose.test.ts
deleted file mode 100644
index 96ac2e6576d4..000000000000
--- a/examples/repro-9290/test/verbose.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { expect, test, vi } from 'vitest'
-import something from '../src/module'
-
-// Manual spy approach - this DOES collect coverage
-vi.mock(import('../src/module'), async (importOriginal) => {
-  const actual = await importOriginal()
-  return {
-    ...actual,
-    default: vi.spyOn(actual, 'default'),
-  }
-})
-
-test('should spy on module and collect coverage with manual spy', () => {
-  const result = something(5)
-  expect(result).toBe(10)
-  expect(something).toHaveBeenCalledWith(5)
-})
diff --git a/examples/repro-9290/vitest.config.ts b/examples/repro-9290/vitest.config.ts
deleted file mode 100644
index de24dd39c727..000000000000
--- a/examples/repro-9290/vitest.config.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { defineConfig } from 'vitest/config'
-
-export default defineConfig({
-  test: {
-    coverage: {
-      provider: 'v8',
-      reporter: ['text', 'html', 'json'],
-      include: ['src/**/*.ts'],
-    },
-  },
-})
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 332f512172b1..1a840b66ebe9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -470,18 +470,6 @@ importers:
         specifier: workspace:*
         version: link:../../packages/vitest
 
-  examples/repro-9290:
-    devDependencies:
-      '@vitest/coverage-v8':
-        specifier: workspace:*
-        version: link:../../packages/coverage-v8
-      vite:
-        specifier: 7.1.5
-        version: 7.1.5(@types/node@24.10.9)(jiti@2.6.1)(lightningcss@1.30.2)(sass-embedded@1.97.3)(sass@1.97.3)(terser@5.44.1)(tsx@4.21.0)(yaml@2.8.2)
-      vitest:
-        specifier: workspace:*
-        version: link:../../packages/vitest
-
   examples/typecheck:
     devDependencies:
       '@types/node':

From 493e5c6725987077bc40dca3ec94429b7ca5122b Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:50:01 +0900
Subject: [PATCH 15/16] test(coverage): handle browser mode difference in
 mock-importActual test

Browser mode reports 100% coverage due to different collection behavior.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../test/mock-importActual.test.ts            | 62 ++++++++++++-------
 test/coverage-test/vitest.config.ts           |  2 +
 2 files changed, 40 insertions(+), 24 deletions(-)

diff --git a/test/coverage-test/test/mock-importActual.test.ts b/test/coverage-test/test/mock-importActual.test.ts
index 2c7d27c3acbf..7dd10cd56227 100644
--- a/test/coverage-test/test/mock-importActual.test.ts
+++ b/test/coverage-test/test/mock-importActual.test.ts
@@ -1,5 +1,5 @@
 import { expect } from 'vitest'
-import { readCoverageMap, runVitest, test } from '../utils'
+import { isBrowser, readCoverageMap, runVitest, test } from '../utils'
 
 test('vi.importActual() collects coverage of original module', async () => {
   await runVitest({
@@ -11,30 +11,44 @@ test('vi.importActual() collects coverage of original module', async () => {
   })
 
   const coverageMap = await readCoverageMap()
-  expect(coverageMap).toMatchInlineSnapshot(`
-    {
-      "branches": "0/0 (100%)",
-      "functions": "1/2 (50%)",
-      "lines": "1/2 (50%)",
-      "statements": "1/2 (50%)",
-    }
-  `)
 
-  const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/mock-target.ts')
-  const functionCoverage = Object.keys(coverage.fnMap)
-    .map(index => ({ name: coverage.fnMap[index].name, hits: coverage.f[index] }))
-    .sort((a, b) => a.name.localeCompare(b.name))
-
-  expect(functionCoverage).toMatchInlineSnapshot(`
-    [
+  if (isBrowser()) {
+    // Browser mode reports 100% due to different coverage collection behavior
+    expect(coverageMap).toMatchInlineSnapshot(`
       {
-        "hits": 1,
-        "name": "double",
-      },
+        "branches": "0/0 (100%)",
+        "functions": "2/2 (100%)",
+        "lines": "2/2 (100%)",
+        "statements": "2/2 (100%)",
+      }
+    `)
+  }
+  else {
+    expect(coverageMap).toMatchInlineSnapshot(`
       {
-        "hits": 0,
-        "name": "triple",
-      },
-    ]
-  `)
+        "branches": "0/0 (100%)",
+        "functions": "1/2 (50%)",
+        "lines": "1/2 (50%)",
+        "statements": "1/2 (50%)",
+      }
+    `)
+
+    const coverage = coverageMap.fileCoverageFor('<process-cwd>/fixtures/src/mock-target.ts')
+    const functionCoverage = Object.keys(coverage.fnMap)
+      .map(index => ({ name: coverage.fnMap[index].name, hits: coverage.f[index] }))
+      .sort((a, b) => a.name.localeCompare(b.name))
+
+    expect(functionCoverage).toMatchInlineSnapshot(`
+      [
+        {
+          "hits": 1,
+          "name": "double",
+        },
+        {
+          "hits": 0,
+          "name": "triple",
+        },
+      ]
+    `)
+  }
 })
diff --git a/test/coverage-test/vitest.config.ts b/test/coverage-test/vitest.config.ts
index 62ff870256ef..2afd3dcfa879 100644
--- a/test/coverage-test/vitest.config.ts
+++ b/test/coverage-test/vitest.config.ts
@@ -91,6 +91,7 @@ export default defineConfig({
             '**/test/cjs-dependency.test.ts',
             '**/test/source-maps.test.ts',
             '**/test/mock-autospy.test.ts',
+            '**/test/mock-importActual.test.ts',
           ],
           exclude: [FIXTURES],
         },
@@ -124,6 +125,7 @@ export default defineConfig({
             '**/test/cjs-dependency.test.ts',
             '**/test/source-maps.test.ts',
             '**/test/mock-autospy.test.ts',
+            '**/test/mock-importActual.test.ts',
           ],
           exclude: [FIXTURES],
         },

From 60c785485e531fca09548e7b6344a411eda5a0b8 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Thu, 29 Jan 2026 10:51:17 +0900
Subject: [PATCH 16/16] test(coverage): fix mock-importActual for all runners

Handle different coverage behavior across runners:
- v8-browser and native: 100%
- v8, istanbul, istanbul-browser: 50%

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 test/coverage-test/test/mock-importActual.test.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/coverage-test/test/mock-importActual.test.ts b/test/coverage-test/test/mock-importActual.test.ts
index 7dd10cd56227..0ad1d2b7b972 100644
--- a/test/coverage-test/test/mock-importActual.test.ts
+++ b/test/coverage-test/test/mock-importActual.test.ts
@@ -1,5 +1,5 @@
 import { expect } from 'vitest'
-import { isBrowser, readCoverageMap, runVitest, test } from '../utils'
+import { isBrowser, isNativeRunner, isV8Provider, readCoverageMap, runVitest, test } from '../utils'
 
 test('vi.importActual() collects coverage of original module', async () => {
   await runVitest({
@@ -12,8 +12,8 @@ test('vi.importActual() collects coverage of original module', async () => {
 
   const coverageMap = await readCoverageMap()
 
-  if (isBrowser()) {
-    // Browser mode reports 100% due to different coverage collection behavior
+  // v8-browser and native runner report 100% due to different coverage collection behavior
+  if ((isBrowser() && isV8Provider()) || isNativeRunner()) {
     expect(coverageMap).toMatchInlineSnapshot(`
       {
         "branches": "0/0 (100%)",