diff --git a/index.js b/index.js
index dcfec48..a161036 100644
--- a/index.js
+++ b/index.js
@@ -9,6 +9,7 @@ try {
     }
 }
 
+const nullish = (value, cond) => ((undefined === value) || (null === value)) ? cond() : value;
 const awsLambdaTaskRoot = process.env.LAMBDA_TASK_ROOT;
 const awsHandler = process.env._HANDLER;
 const FUNCTION_EXPR = /^([^.]*)\.(.*)$/;
@@ -52,12 +53,15 @@ if (awsLambdaTaskRoot && awsHandler) {
 }
 
 delete require.cache[file];
-const mainExports = __jymfony.autoload.classLoader.loadFile(file, null);
+const mainExports = __jymfony.autoload.classLoader.loadFile(file);
+if (mainExports.__esModule) {
+    exportName = 'default';
+}
 
-let runtime = process.env.APP_RUNTIME ?? Jymfony.Component.Runtime.JymfonyRuntime;
+let runtime = nullish(process.env.APP_RUNTIME, () => Jymfony.Component.Runtime.JymfonyRuntime);
 const reflection = new ReflectionClass(runtime);
 
-runtime = reflection.newInstance(Object.assign({ project_dir: dirname(file) }, globalThis.APP_RUNTIME_OPTIONS ?? {}));
+runtime = reflection.newInstance(Object.assign({ project_dir: dirname(file) }, nullish(globalThis.APP_RUNTIME_OPTIONS, () => ({}))));
 
 let [ app, args ] = runtime.getResolver(null === exportName ? mainExports : mainExports[exportName]).resolve();
 (async function () {
diff --git a/src/JymfonyRuntime.js b/src/JymfonyRuntime.js
index d5b9e5d..570c758 100644
--- a/src/JymfonyRuntime.js
+++ b/src/JymfonyRuntime.js
@@ -6,6 +6,20 @@ const ConsoleOutput = Jymfony.Component.Console.Output.ConsoleOutput;
 const GenericRuntime = Jymfony.Component.Runtime.GenericRuntime;
 const JymfonyErrorHandler = Jymfony.Component.Runtime.Internal.JymfonyErrorHandler;
 
+function getInput(options) {
+    const input = new ArgvInput();
+    const env = input.getParameterOption([ '--env', '-e' ], null, true);
+    if (null !== env) {
+        process.env[options.env_var_name] = env;
+    }
+
+    if (input.hasParameterOption('--no-debug', true)) {
+        process.env[options.debug_var_name] = '0';
+    }
+
+    return input;
+}
+
 /**
  * Knows the basic conventions to run Jymfony apps.
  *
@@ -65,7 +79,7 @@ export default class JymfonyRuntime extends GenericRuntime {
         }
 
         const prodEnvs = options.prod_envs ?? [ 'prod' ];
-        const input = JymfonyRuntime.#getInput(options);
+        const input = getInput(options);
         if (
             !(options.disable_dotenv ?? !ReflectionClass.exists('Jymfony.Component.Dotenv.Dotenv')) &&
             !!options.project_dir
@@ -151,18 +165,4 @@ export default class JymfonyRuntime extends GenericRuntime {
 
         return self;
     }
-
-    static #getInput(options) {
-        const input = new ArgvInput();
-        const env = input.getParameterOption([ '--env', '-e' ], null, true);
-        if (null !== env) {
-            process.env[options.env_var_name] = env;
-        }
-
-        if (input.hasParameterOption('--no-debug', true)) {
-            process.env[options.debug_var_name] = '0';
-        }
-
-        return input;
-    }
 }