From b63bf5b56edd4e2eb6307fd793bf558e1c2cdb36 Mon Sep 17 00:00:00 2001
From: Philipp Spiess <hello@philippspiess.com>
Date: Mon, 24 Feb 2025 17:30:18 +0100
Subject: [PATCH 1/4] Vite: Handle missing mtime

---
 packages/@tailwindcss-vite/src/index.ts | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/packages/@tailwindcss-vite/src/index.ts b/packages/@tailwindcss-vite/src/index.ts
index 8e3d2348ea16..2a7c933e6340 100644
--- a/packages/@tailwindcss-vite/src/index.ts
+++ b/packages/@tailwindcss-vite/src/index.ts
@@ -202,8 +202,9 @@ class Root {
   private candidates: Set<string> = new Set<string>()
 
   // List of all build dependencies (e.g. imported  stylesheets or plugins) and
-  // their last modification timestamp
-  private buildDependencies = new Map<string, number>()
+  // their last modification timestamp. If no mtime can be found, we need to
+  // assume the file has always changed.
+  private buildDependencies = new Map<string, number | null>()
 
   constructor(
     private id: string,
@@ -334,14 +335,22 @@ class Root {
   }
 
   private async addBuildDependency(path: string) {
-    let stat = await fs.stat(path)
-    this.buildDependencies.set(path, stat.mtimeMs)
+    let mtime: number | null = null
+    try {
+      mtime = (await fs.stat(path)).mtimeMs
+    } catch {}
+    this.buildDependencies.set(path, mtime)
   }
 
   private async requiresBuild(): Promise<boolean> {
     for (let [path, mtime] of this.buildDependencies) {
-      let stat = await fs.stat(path)
-      if (stat.mtimeMs > mtime) {
+      if (mtime === null) return true
+      try {
+        let stat = await fs.stat(path)
+        if (stat.mtimeMs > mtime) {
+          return true
+        }
+      } catch {
         return true
       }
     }

From 5beab27d37af5c7644bdfbe626506de7b6718b04 Mon Sep 17 00:00:00 2001
From: Philipp Spiess <hello@philippspiess.com>
Date: Mon, 24 Feb 2025 17:30:47 +0100
Subject: [PATCH 2/4] Add change log

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b75932023c29..7eb9e3397a7b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - _Experimental_: Add `user-valid` and `user-invalid` variants ([#12370](https://github.com/tailwindlabs/tailwindcss/pull/12370))
 - _Experimental_: Add `wrap-anywhere`, `wrap-break-word`, and `wrap-normal` utilities ([#12128](https://github.com/tailwindlabs/tailwindcss/pull/12128))
 
+### Fixed
+
+- Vite: Don't crash when importing virtual modules
+
 ## [4.0.8] - 2025-02-21
 
 ### Added

From a8add9e43a5b1290bc6fc3b737ed391c73886f31 Mon Sep 17 00:00:00 2001
From: Philipp Spiess <hello@philippspiess.com>
Date: Mon, 24 Feb 2025 17:42:30 +0100
Subject: [PATCH 3/4] Add regression test

---
 integrations/vite/virtual-modules.test.ts | Bin 0 -> 2339 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 integrations/vite/virtual-modules.test.ts

diff --git a/integrations/vite/virtual-modules.test.ts b/integrations/vite/virtual-modules.test.ts
new file mode 100644
index 0000000000000000000000000000000000000000..12eadb6c715b903259d0e2840a7ee9435d82caf2
GIT binary patch
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From 545ae0116de39dd0b1ebc4ba76323c2495266563 Mon Sep 17 00:00:00 2001
From: Philipp Spiess <hello@philippspiess.com>
Date: Mon, 24 Feb 2025 17:45:22 +0100
Subject: [PATCH 4/4] Add change log

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7eb9e3397a7b..5a5742b7eb40 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,7 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-- Vite: Don't crash when importing virtual modules
+- Vite: Don't crash when importing a virtual module in JavaScript that ends in `.css` ([#16780](https://github.com/tailwindlabs/tailwindcss/pull/16780))
 
 ## [4.0.8] - 2025-02-21