diff --git a/build_wasm.sh b/build_wasm.sh
index 8091bfb5..a993dbd3 100644
--- a/build_wasm.sh
+++ b/build_wasm.sh
@@ -1,3 +1,3 @@
 rm -rf web/lib/
 mkdir -p web/lib/
-em++ src/main.cpp -fno-rtti -fexceptions -sEXIT_RUNTIME -O3 -sEXPORTED_FUNCTIONS=_repl_input,_repl_start,_pkpy_delete,_pkpy_new_repl,_pkpy_repl_input,_pkpy_new_tvm,_pkpy_tvm_exec_async,_pkpy_tvm_get_state,_pkpy_tvm_read_jsonrpc_request,_pkpy_tvm_reset_state,_pkpy_tvm_terminate,_pkpy_tvm_write_jsonrpc_response,_pkpy_new_vm,_pkpy_vm_add_module,_pkpy_vm_eval,_pkpy_vm_exec,_pkpy_vm_get_global,_pkpy_vm_read_output -sEXPORTED_RUNTIME_METHODS=ccall -o web/lib/pocketpy.js
\ No newline at end of file
+em++ src/main.cpp -fno-rtti -fexceptions -sEXIT_RUNTIME -O3 -sMODULARIZE -sEXPORTED_FUNCTIONS=_repl_input,_repl_start,_pkpy_delete,_pkpy_new_repl,_pkpy_repl_input,_pkpy_new_tvm,_pkpy_tvm_exec_async,_pkpy_tvm_get_state,_pkpy_tvm_read_jsonrpc_request,_pkpy_tvm_reset_state,_pkpy_tvm_terminate,_pkpy_tvm_write_jsonrpc_response,_pkpy_new_vm,_pkpy_vm_add_module,_pkpy_vm_eval,_pkpy_vm_exec,_pkpy_vm_get_global,_pkpy_vm_read_output -sEXPORTED_RUNTIME_METHODS=ccall,cwrap -o web/lib/pocketpy.js
\ No newline at end of file
diff --git a/plugins/flutter/example/test/widget_test.dart b/plugins/flutter/example/test/widget_test.dart
deleted file mode 100644
index 092d222f..00000000
--- a/plugins/flutter/example/test/widget_test.dart
+++ /dev/null
@@ -1,30 +0,0 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:example/main.dart';
-
-void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
-  });
-}
diff --git a/src/main.cpp b/src/main.cpp
index ba2c101c..6b4068da 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -26,19 +26,12 @@ struct Timer{
 
 // these code is for demo use, feel free to modify it
 REPL* _repl;
-
 extern "C" {
     __EXPORT
-    void repl_start(){
-        _repl = pkpy_new_repl(pkpy_new_vm(true));
-    }
-
+    void repl_start(){ _repl = pkpy_new_repl(pkpy_new_vm(true));}
     __EXPORT
-    bool repl_input(const char* line){
-        return pkpy_repl_input(_repl, line) == NEED_MORE_LINES;
-    }
+    bool repl_input(const char* line){ return pkpy_repl_input(_repl, line) == NEED_MORE_LINES;}
 }
-
 #else
 
 
diff --git a/src/pocketpy.h b/src/pocketpy.h
index 99d93f65..88ec922c 100644
--- a/src/pocketpy.h
+++ b/src/pocketpy.h
@@ -589,6 +589,9 @@ void __initializeBuiltinFunctions(VM* _vm) {
 #define __EXPORT __declspec(dllexport)
 #elif __APPLE__
 #define __EXPORT __attribute__((visibility("default"))) __attribute__((used))
+#elif defined(__EMSCRIPTEN__) || defined(__wasm__) || defined(__wasm32__) || defined(__wasm64__)
+#include <emscripten.h>
+#define __EXPORT EMSCRIPTEN_KEEPALIVE
 #else
 #define __EXPORT
 #endif