From bc777f4836560f4c226a11ba15b53f96892d18b2 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sun, 11 Oct 2026 17:18:23 -0700
Subject: [PATCH] Shrink ValueSymbolLinks by 16 bytes

---
 tsc/internal/checker/checker.go |  4 ++--
 tsc/internal/checker/types.go   | 13 ++++++-------
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/tsc/internal/checker/checker.go b/tsc/internal/checker/checker.go
index 345ea00ce1437..b03cebf741b22 100644
--- a/tsc/internal/checker/checker.go
+++ b/tsc/internal/checker/checker.go
@@ -647,6 +647,7 @@ type Checker struct {
 	iterationTypesCache                         map[IterationTypesKey]IterationTypes
 	markerTypes                                 collections.Set[*Type]
 	resolvingExplicitTypeOfSymbol               collections.Set[*ast.Symbol]
+	constructorOrFunctionChecked                collections.Set[*ast.Symbol]
 	undefinedSymbol                             *ast.Symbol
 	argumentsSymbol                             *ast.Symbol
 	requireSymbol                               *ast.Symbol
@@ -3492,8 +3493,7 @@ func (c *Checker) checkFunctionOrMethodDeclaration(node *ast.Node) {
 
 func (c *Checker) checkFunctionOrConstructorSymbol(symbol *ast.Symbol) {
 	// Only check the symbol once
-	if links := c.valueSymbolLinks.Get(symbol); !links.functionOrConstructorChecked {
-		links.functionOrConstructorChecked = true
+	if c.constructorOrFunctionChecked.AddIfAbsent(symbol) {
 		c.checkFunctionOrConstructorSymbolWorker(symbol)
 	}
 }
diff --git a/tsc/internal/checker/types.go b/tsc/internal/checker/types.go
index e2ec618a8caf2..7e4748930262c 100644
--- a/tsc/internal/checker/types.go
+++ b/tsc/internal/checker/types.go
@@ -180,13 +180,12 @@ type SymbolReferenceLinks struct {
 // Links for value symbols
 
 type ValueSymbolLinks struct {
-	resolvedType                 *Type // Type of value symbol
-	writeType                    *Type
-	target                       *ast.Symbol
-	mapper                       *TypeMapper
-	nameType                     *Type
-	containingType               *Type // Mapped type for mapped type property, containing union or intersection type for synthetic property
-	functionOrConstructorChecked bool
+	resolvedType   *Type // Type of value symbol
+	writeType      *Type
+	target         *ast.Symbol
+	mapper         *TypeMapper
+	nameType       *Type
+	containingType *Type // Mapped type for mapped type property, containing union or intersection type for synthetic property
 }
 
 // Additional links for mapped symbols