fix: allow process.env.DEBUG to be a boolean in @tailwindcss/node (#18485)

TanStack Start build to `cloudflare-module`, `debug` value type is
boolean.
reference:
https://developers.cloudflare.com/workers/framework-guides/web-apps/tanstack/

---------

Co-authored-by: Jordan Pittman <[email protected]>

Author: okxiaoliang4

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix trailing `)` from interfering with extraction in Clojure keywords ([#18345](https://github.com/tailwindlabs/tailwindcss/pull/18345))
 - Detect classes inside Elixir charlist, word list, and string sigils ([#18432](https://github.com/tailwindlabs/tailwindcss/pull/18432))
 - Track source locations through `@plugin` and `@config` ([#18345](https://github.com/tailwindlabs/tailwindcss/pull/18345))
+- Handle when `process.env.DEBUG` is a boolean in `@tailwindcss/node` ([#18485](https://github.com/tailwindlabs/tailwindcss/pull/18485))
 
 ## [4.1.11] - 2025-06-26
 

packages/@tailwindcss-node/src/env.ts

@@ -1,6 +1,10 @@
 export const DEBUG = resolveDebug(process.env.DEBUG)
 
 function resolveDebug(debug: typeof process.env.DEBUG) {
+  if (typeof debug === 'boolean') {
+    return debug
+  }
+
   if (debug === undefined) {
     return false
   }