From 703253ae6b95b9731649ca7cc2529099e5115007 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Fri, 1 Mar 2024 17:37:23 -0800
Subject: [PATCH] Delay expensive functionHasImplicitReturn call

---
 src/compiler/checker.ts | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 4f7e8d1a6f7..1f69b357ed0 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -37415,13 +37415,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             singleReturn = func.body; // arrow function
         }
         else {
-            if (functionHasImplicitReturn(func)) return undefined;
-
             const bailedEarly = forEachReturnStatement(func.body as Block, returnStatement => {
                 if (singleReturn || !returnStatement.expression) return true;
                 singleReturn = returnStatement.expression;
             });
-            if (bailedEarly || !singleReturn) return undefined;
+            if (bailedEarly || !singleReturn || functionHasImplicitReturn(func)) return undefined;
         }
 
         return checkIfExpressionRefinesAnyParameter(singleReturn);