From 6585f334a1cc272e6faf471d738f2b9ebeb10265 Mon Sep 17 00:00:00 2001
From: Chinmay Garde <chinmaygarde@gmail.com>
Date: Wed, 6 Feb 2019 15:29:19 -0800
Subject: [PATCH] Allow all entrypoints support by the command line VM. (#7717)

---
 lib/ui/hooks.dart | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/lib/ui/hooks.dart b/lib/ui/hooks.dart
index 3f536d2fa..b1550bf90 100644
--- a/lib/ui/hooks.dart
+++ b/lib/ui/hooks.dart
@@ -168,12 +168,26 @@ void _drawFrame() {
   _invoke(window.onDrawFrame, window._onDrawFrameZone);
 }
 
+// ignore: always_declare_return_types, prefer_generic_function_type_aliases
+typedef _UnaryFunction(Null args);
+// ignore: always_declare_return_types, prefer_generic_function_type_aliases
+typedef _BinaryFunction(Null args, Null message);
+
 @pragma('vm:entry-point')
 // ignore: unused_element
 void _runMainZoned(Function startMainIsolateFunction, Function userMainFunction) {
   startMainIsolateFunction((){
     runZoned<Future<void>>(() {
-      userMainFunction();
+      const List<String> empty_args = <String>[];
+      if (userMainFunction is _BinaryFunction) {
+        // This seems to be undocumented but supported by the command line VM.
+        // Let's do the same in case old entry-points are ported to Flutter.
+        (userMainFunction as dynamic)(empty_args, '');
+      } else if (userMainFunction is _UnaryFunction) {
+        (userMainFunction as dynamic)(empty_args);
+      } else {
+        userMainFunction();
+      }
     }, onError: (Object error, StackTrace stackTrace) {
       _reportUnhandledException(error.toString(), stackTrace.toString());
     });
-- 
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