fix(laroux): improve handling of undefined values in logging and JSR resolver plugin

- Updated log level mapping to use constants from the logging module for better clarity and maintainability.
- Changed return values in JSR resolver plugin to return empty objects instead of undefined for improved error handling.
- Added safety checks in RSC rewrite imports to prevent processing errors when accessing string literals.

Author: eser

pkg/@eser/cli/commands/laroux/build.ts

@@ -47,15 +47,14 @@ export const buildHandler = async (ctx: CommandContext): Promise<void> => {
   const { runtime } = await import("@eser/standards/runtime");
 
   // Map log level names to @eser/logging severity values
-  // See logging.Severities: Trace=1, Debug=5, Info=9, Warning=13, Error=17, Critical=21
-  const logLevelMap: Record<LogLevel, number> = {
-    trace: 1, // Severities.Trace
-    debug: 5, // Severities.Debug
-    info: 9, // Severities.Info
-    warn: 13, // Severities.Warning
-    error: 17, // Severities.Error
-    fatal: 21, // Severities.Critical
-  };
+  const logLevelMap = {
+    trace: logging.Severities.Trace,
+    debug: logging.Severities.Debug,
+    info: logging.Severities.Info,
+    warn: logging.Severities.Warning,
+    error: logging.Severities.Error,
+    fatal: logging.Severities.Critical,
+  } as const;
 
   await logging.config.configure({
     sinks: {

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

@@ -32,6 +32,11 @@ function isInsideStringLiteral(content: string, position: number): boolean {
   for (let i = 0; i < position; i++) {
     const char = content[i];
 
+    // Safety check (shouldn't happen since i < position <= content.length)
+    if (char === undefined) {
+      break;
+    }
+
     // Skip escaped quotes
     if (prevChar === "\\") {
       prevChar = char;

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

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