fix(config): exclude virtual modules from native config compat check

packages/vite/src/node/__tests__/fixtures/config/native-compat/mts-config/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "@vitejs/test-native-compat-mts",
+  "type": "commonjs",
+  "private": true
+}

packages/vite/src/node/__tests__/fixtures/config/native-compat/mts-config/vite.config.mts

@@ -0,0 +1,3 @@
+import { defineConfig } from 'vite'
+
+export default defineConfig({})

packages/vite/src/node/nativeConfigCompat.ts

@@ -217,7 +217,13 @@ export function createNativeConfigCompatPlugin(
   return {
     name: 'vite:native-config-compat-check',
     transform: {
-      filter: { id: /\.[cm]?[jt]sx?$/ },
+      filter: {
+        id: {
+          include: /\.[cm]?[jt]sx?$/,
+          // exclude rolldown runtime
+          exclude: /^\0/,
+        },
+      },
       async handler(code, id) {
         const isESM =
           typeof process.versions.deno === 'string' || isFilePathESM(id)

packages/vite/src/node/utils.ts

@@ -430,6 +430,13 @@ export function isFilePathESM(
     return true
   } else if (/\.c[jt]s$/.test(filePath)) {
     return false
+  } else if (filePath.startsWith('\0')) {
+    // treat virtual modules as ESM
+    return true
+  } else if (!path.isAbsolute(filePath)) {
+    // should not rely on `process.cwd()` as that would depend on
+    // the environment and make it unreproducible
+    return false
   } else {
     // check package.json for type: "module"
     try {
@@ -453,6 +460,15 @@ export function isFilePathFormatExplicit(
   if (/\.[mc][jt]s$/.test(filePath)) {
     return true
   }
+  if (filePath.startsWith('\0')) {
+    // treat virtual modules as ESM
+    return true
+  }
+  if (!path.isAbsolute(filePath)) {
+    // should not rely on `process.cwd()` as that would depend on
+    // the environment and make it unreproducible
+    return false
+  }
   try {
     const pkg = findNearestPackageData(path.dirname(filePath), packageCache)
     return pkg?.data.type === 'module' || pkg?.data.type === 'commonjs'