fix: resolve intermittent "Can't resolve 'tailwindcss'" on Windows (#11747)

Set globalThis.__tw_resolve in postcss.config.js to bypass
enhanced-resolve's CachedInputFileSystem, which caches stale
negative results on Windows (e.g. when Windows Defender scans
node_modules). Also fix @source path from "./src" to "."
since the directive is relative to the CSS file location.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

postcss.config.js

@@ -1,3 +1,35 @@
+const path = require('path');
+
+// Workaround for https://github.com/ant-design/ant-design-pro/issues/11747
+// On Windows, @tailwindcss/node uses enhanced-resolve with a 4-second
+// CachedInputFileSystem that can cache stale negative results (e.g. when
+// Windows Defender locks node_modules). This causes intermittent
+// "Can't resolve 'tailwindcss'" errors. Setting __tw_resolve bypasses
+// enhanced-resolve by using Node.js require.resolve, which is reliable.
+if (typeof globalThis.__tw_resolve !== 'function') {
+  globalThis.__tw_resolve = (specifier, fromDir) => {
+    if (specifier.startsWith('.') || specifier.startsWith('/')) return;
+    try {
+      const pkgJsonPath = require.resolve(specifier + '/package.json', {
+        paths: [fromDir],
+      });
+      const pkg = require(pkgJsonPath);
+      const pkgDir = path.dirname(pkgJsonPath);
+      if (pkg.exports?.['.']?.style) {
+        return path.join(pkgDir, pkg.exports['.'].style);
+      }
+      if (pkg.style) {
+        return path.join(pkgDir, pkg.style);
+      }
+      const indexPath = path.join(pkgDir, 'index.css');
+      try {
+        require('fs').accessSync(indexPath);
+        return indexPath;
+      } catch {}
+    } catch {}
+  };
+}
+
 module.exports = {
   plugins: {
     '@tailwindcss/postcss': {},

src/tailwind.css

@@ -1,3 +1,3 @@
 @import "tailwindcss";
 
-@source "./src";
+@source ".";