fix(config): update .smartconfig.json handling and harden bundler runtime compatibility

ts/mod_rspack/index.child.ts

@@ -52,6 +52,7 @@ export class TsBundleProcess {
       output: {
         path: outputDir,
         filename: outputFilename,
+        module: true,
         library: {
           type: 'module' as const,
         },
@@ -86,9 +87,6 @@ export class TsBundleProcess {
           },
         ],
       },
-      experiments: {
-        outputModule: true,
-      },
     };
 
     return new Promise((resolve, reject) => {
@@ -98,6 +96,10 @@ export class TsBundleProcess {
           reject(err);
           return;
         }
+        if (!stats) {
+          reject(new Error('Rspack did not return stats'));
+          return;
+        }
 
         if (stats.hasErrors()) {
           console.error(stats.toString());
@@ -140,6 +142,7 @@ export class TsBundleProcess {
       output: {
         path: outputDir,
         filename: outputFilename,
+        module: true,
         library: {
           type: 'module' as const,
         },
@@ -184,9 +187,6 @@ export class TsBundleProcess {
         usedExports: true,
         sideEffects: true,
       },
-      experiments: {
-        outputModule: true,
-      },
     };
 
     return new Promise((resolve, reject) => {
@@ -196,6 +196,10 @@ export class TsBundleProcess {
           reject(err);
           return;
         }
+        if (!stats) {
+          reject(new Error('Rspack did not return stats'));
+          return;
+        }
 
         if (stats.hasErrors()) {
           console.error(stats.toString());
@@ -221,9 +225,11 @@ export class TsBundleProcess {
 
 const run = async () => {
   console.log('running spawned compilation process');
-  const transportOptions: interfaces.IEnvTransportOptions = JSON.parse(
-    process.env.transportOptions,
-  );
+  const transportOptionsJson = process.env.transportOptions;
+  if (!transportOptionsJson) {
+    throw new Error('Missing transportOptions environment variable');
+  }
+  const transportOptions: interfaces.IEnvTransportOptions = JSON.parse(transportOptionsJson);
   console.log('=======> RSPACK');
   console.log(transportOptions);
   process.chdir(transportOptions.cwd);