diff --git a/integrations/utils.ts b/integrations/utils.ts
index 9b06d8dc1a18..0a881ba367f6 100644
--- a/integrations/utils.ts
+++ b/integrations/utils.ts
@@ -21,6 +21,7 @@ interface SpawnedProcess {
 
 interface ChildProcessOptions {
   cwd?: string
+  env?: Record<string, string>
 }
 
 interface ExecOptions {
@@ -109,6 +110,7 @@ export function test(
               {
                 cwd,
                 ...childProcessOptions,
+                env: childProcessOptions.env,
               },
               (error, stdout, stderr) => {
                 if (error) {
@@ -145,10 +147,11 @@ export function test(
           let child = spawn(command, {
             cwd,
             shell: true,
+            ...childProcessOptions,
             env: {
               ...process.env,
+              ...childProcessOptions.env,
             },
-            ...childProcessOptions,
           })
 
           function dispose() {
diff --git a/integrations/vite/nuxt.test.ts b/integrations/vite/nuxt.test.ts
index 8c7eedc386d7..cfd521e48300 100644
--- a/integrations/vite/nuxt.test.ts
+++ b/integrations/vite/nuxt.test.ts
@@ -65,7 +65,11 @@ test('dev mode', SETUP, async ({ fs, spawn, getFreePort }) => {
 test('build', SETUP, async ({ spawn, getFreePort, exec }) => {
   let port = await getFreePort()
   await exec(`pnpm nuxt build`)
-  await spawn(`PORT=${port} pnpm nuxt preview`)
+  await spawn(`pnpm nuxt preview`, {
+    env: {
+      PORT: `${port}`,
+    },
+  })
 
   await retryAssertion(async () => {
     let css = await fetchStyles(port)
diff --git a/packages/@tailwindcss-upgrade/src/migrate-js-config.ts b/packages/@tailwindcss-upgrade/src/migrate-js-config.ts
index 63fc094db8fb..84a062b461b8 100644
--- a/packages/@tailwindcss-upgrade/src/migrate-js-config.ts
+++ b/packages/@tailwindcss-upgrade/src/migrate-js-config.ts
@@ -1,6 +1,6 @@
 import { Scanner } from '@tailwindcss/oxide'
 import fs from 'node:fs/promises'
-import { dirname, resolve } from 'node:path'
+import path from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { type Config } from 'tailwindcss'
 import defaultTheme from 'tailwindcss/defaultTheme'
@@ -21,7 +21,7 @@ import { findStaticPlugins, type StaticPluginOptions } from './utils/extract-sta
 import { info } from './utils/renderer'
 
 const __filename = fileURLToPath(import.meta.url)
-const __dirname = dirname(__filename)
+const __dirname = path.dirname(__filename)
 
 export type JSConfigMigration =
   // Could not convert the config file, need to inject it as-is in a @config directive
@@ -195,21 +195,21 @@ async function migrateContent(
     return unresolvedConfig.future?.relativeContentPathsByDefault ?? false
   })()
 
-  let contentFiles = Array.isArray(unresolvedConfig.content)
-    ? unresolvedConfig.content
-    : (unresolvedConfig.content?.files ?? []).map((content) => {
-        if (typeof content === 'string' && contentIsRelative) {
-          return resolve(dirname(configPath), content)
+  let sourceGlobs = Array.isArray(unresolvedConfig.content)
+    ? unresolvedConfig.content.map((pattern) => ({ base, pattern }))
+    : (unresolvedConfig.content?.files ?? []).map((pattern) => {
+        if (typeof pattern === 'string' && contentIsRelative) {
+          return { base: path.dirname(configPath), pattern: pattern }
         }
-        return content
+        return { base, pattern }
       })
 
-  for (let content of contentFiles) {
-    if (typeof content !== 'string') {
-      throw new Error('Unsupported content value: ' + content)
+  for (let { base, pattern } of sourceGlobs) {
+    if (typeof pattern !== 'string') {
+      throw new Error('Unsupported content value: ' + pattern)
     }
 
-    let sourceFiles = patternSourceFiles({ base, pattern: content })
+    let sourceFiles = patternSourceFiles({ base, pattern })
 
     let autoContentContainsAllSourceFiles = true
     for (let sourceFile of sourceFiles) {
@@ -220,7 +220,7 @@ async function migrateContent(
     }
 
     if (!autoContentContainsAllSourceFiles) {
-      sources.push({ base, pattern: content })
+      sources.push({ base, pattern })
     }
   }
   return sources
diff --git a/packages/@tailwindcss-upgrade/src/template/migrate.ts b/packages/@tailwindcss-upgrade/src/template/migrate.ts
index d70ca20f9dec..f95344fa0bc8 100644
--- a/packages/@tailwindcss-upgrade/src/template/migrate.ts
+++ b/packages/@tailwindcss-upgrade/src/template/migrate.ts
@@ -86,7 +86,7 @@ export default async function migrateContents(
 }
 
 export async function migrate(designSystem: DesignSystem, userConfig: Config, file: string) {
-  let fullPath = path.resolve(process.cwd(), file)
+  let fullPath = path.isAbsolute(file) ? file : path.resolve(process.cwd(), file)
   let contents = await fs.readFile(fullPath, 'utf-8')
 
   await fs.writeFile(
diff --git a/packages/@tailwindcss-upgrade/src/utils/hoist-static-glob-parts.ts b/packages/@tailwindcss-upgrade/src/utils/hoist-static-glob-parts.ts
index 0c8ab4629fd6..18d58799857b 100644
--- a/packages/@tailwindcss-upgrade/src/utils/hoist-static-glob-parts.ts
+++ b/packages/@tailwindcss-upgrade/src/utils/hoist-static-glob-parts.ts
@@ -1,3 +1,4 @@
+import { normalizePath } from '@tailwindcss/node'
 import braces from 'braces'
 import path from 'node:path'
 
@@ -12,10 +13,12 @@ export function hoistStaticGlobParts(entry: GlobEntry): GlobEntry[] {
     let [staticPart, dynamicPart] = splitPattern(pattern)
 
     // Move static part into the `base`.
+    let absolutePosixPath = normalizePath(entry.base)
+
     if (staticPart !== null) {
-      clone.base = path.resolve(entry.base, staticPart)
+      clone.base = path.posix.join(absolutePosixPath, staticPart)
     } else {
-      clone.base = path.resolve(entry.base)
+      clone.base = absolutePosixPath
     }
 
     // Move dynamic part into the `pattern`.
@@ -56,7 +59,7 @@ function splitPattern(pattern: string): [staticPart: string | null, dynamicPart:
   let lastSlashPosition: number | null = null
 
   for (let i = 0; i < pattern.length; i++) {
-    let c = pattern[i];
+    let c = pattern[i]
     if (c === '/') {
       lastSlashPosition = i
     }