fix(laroux): improve handling of undefined values in various functions

- Updated checks to handle undefined values instead of null in CSS module caching and JSR resolver plugin error handling.
- Added a safeguard to skip processing when no import path is captured in the RSC rewrite imports.
- Adjusted exports in middleware to reflect changes in rate limiter functionality.

Author: eser

pkg/@eser/laroux-bundler/adapters/react/rsc-rewrite-imports.ts

@@ -74,6 +74,11 @@ function parseImports(
   while ((match = importRegex.exec(content)) !== null) {
     const importPath = match[1];
 
+    // Skip if no import path captured
+    if (!importPath) {
+      continue;
+    }
+
     // Skip if this import is inside a string literal (e.g., code samples)
     if (isInsideStringLiteral(content, match.index)) {
       continue;

pkg/@eser/laroux-bundler/css-modules.ts

@@ -142,7 +142,7 @@ export async function processCSSModules(
             const fileMtime = fileStat.mtime?.getTime() ?? 0;
             const cached = cache.getCssModuleResult(cssPath, fileMtime);
 
-            if (cached !== undefined) {
+            if (cached !== undefined && cached !== null) {
               cacheHits++;
               return [cssPath, {
                 code: cached.code,

pkg/@eser/laroux-bundler/jsr-resolver-plugin.ts

@@ -78,7 +78,7 @@ export function createJsrResolverPlugin(
               error instanceof Error ? error.message : String(error)
             }`,
           );
-          return null; // Let other resolvers handle it
+          return undefined; // Let other resolvers handle it
         }
       });
 
@@ -107,7 +107,7 @@ export function createJsrResolverPlugin(
         if (contents !== undefined) {
           return { contents, loader: "js" };
         }
-        return null;
+        return undefined;
       });
 
       // Match explicit jsr: specifiers
@@ -140,7 +140,7 @@ export function createJsrResolverPlugin(
               error instanceof Error ? error.message : String(error)
             }`,
           );
-          return null;
+          return undefined;
         }
       });
     },

pkg/@eser/laroux-server/runtime/middleware/mod.ts

@@ -6,7 +6,7 @@
 
 export {
   createRateLimiter,
-  getRateLimitHeaders,
+  getClientIp,
   type RateLimitConfig,
-  stopRateLimiter,
+  type RateLimiterInstance,
 } from "@eser/http/middlewares/rate-limiter";