diff --git a/src/Plugins/Tia/ContentHash.php b/src/Plugins/Tia/ContentHash.php
index 3c56b6cd..368b1209 100644
--- a/src/Plugins/Tia/ContentHash.php
+++ b/src/Plugins/Tia/ContentHash.php
@@ -60,6 +60,12 @@ final class ContentHash
             return self::hashPhpContent($raw);
         }
 
+        foreach (['.vue', '.tsx', '.jsx', '.svelte', '.ts', '.js', '.mjs', '.cjs', '.mts'] as $extension) {
+            if (str_ends_with($lower, $extension)) {
+                return self::hashJsContent($raw);
+            }
+        }
+
         return hash('xxh128', $raw);
     }
 
@@ -115,4 +121,24 @@ final class ContentHash
 
         return hash('xxh128', trim($stripped));
     }
+
+    /**
+     * Conservative JS/TS/Vue/Svelte normaliser. Strips `//` line
+     * comments and `/* … *\/` block comments that appear on their own
+     * lines (including leading indentation), then collapses
+     * whitespace. Deliberately leaves trailing comments after code
+     * alone — a string literal like `'http://foo'` would be unsafe to
+     * split on `//` without a full lexer. The direction of error is
+     * over-detection (we may not strip a trailing comment that's
+     * purely cosmetic), never under-detection. Blank lines and
+     * indentation changes are erased regardless.
+     */
+    private static function hashJsContent(string $raw): string
+    {
+        $stripped = preg_replace('/^\s*\/\/[^\n]*$/m', '', $raw) ?? $raw;
+        $stripped = preg_replace('/^\s*\/\*.*?\*\/\s*$/sm', '', $stripped) ?? $stripped;
+        $stripped = preg_replace('/\s+/', ' ', $stripped) ?? $stripped;
+
+        return hash('xxh128', trim($stripped));
+    }
 }
diff --git a/src/Plugins/Tia/Fingerprint.php b/src/Plugins/Tia/Fingerprint.php
index aa53eee1..e02e0b44 100644
--- a/src/Plugins/Tia/Fingerprint.php
+++ b/src/Plugins/Tia/Fingerprint.php
@@ -52,7 +52,15 @@ final readonly class Fingerprint
     //       the PHP fallback) so shared components / layouts /
     //       composables invalidate the specific pages they're used
     //       by, not every browser test.
-    private const int SCHEMA_VERSION = 8;
+    //   v9: `ContentHash` now normalises JS/TS/Vue/Svelte comments +
+    //       whitespace. Old graphs' run-tree hashes for those files
+    //       were raw-byte; mixing formats would flag every JS file as
+    //       changed on first run.
+    //   v10: `vite.config.*` hashed into the structural bucket. A
+    //        Vite config change reshapes the module dependency graph
+    //        that `JsModuleGraph` records; without a graph rebuild
+    //        the stored `$jsFileToComponents` map silently goes stale.
+    private const int SCHEMA_VERSION = 10;
 
     /**
      * @return array{