From f07b69498eaa3f680c222cc0be081391977edd21 Mon Sep 17 00:00:00 2001
From: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
Date: Thu, 8 Jan 2026 15:13:05 -0800
Subject: [PATCH] Preallocate types slice in getLiteralTypeFromProperties

---
 internal/checker/checker.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/internal/checker/checker.go b/internal/checker/checker.go
index 0ef37ebeca6..c921129e8b5 100644
--- a/internal/checker/checker.go
+++ b/internal/checker/checker.go
@@ -25953,11 +25953,13 @@ func (c *Checker) getLiteralTypeFromProperties(t *Type, include TypeFlags, inclu
 	if includeOrigin && t.objectFlags&(ObjectFlagsClassOrInterface|ObjectFlagsReference) != 0 || t.alias != nil {
 		origin = c.newIndexType(t, IndexFlagsNone)
 	}
-	var types []*Type
-	for _, prop := range c.getPropertiesOfType(t) {
+	props := c.getPropertiesOfType(t)
+	indexInfos := c.getIndexInfosOfType(t)
+	types := make([]*Type, 0, len(props)+len(indexInfos))
+	for _, prop := range props {
 		types = append(types, c.getLiteralTypeFromProperty(prop, include, false))
 	}
-	for _, info := range c.getIndexInfosOfType(t) {
+	for _, info := range indexInfos {
 		if info != c.enumNumberIndexInfo && c.isKeyTypeIncluded(info.keyType, include) {
 			if info.keyType == c.stringType && include&TypeFlagsNumber != 0 {
 				types = append(types, c.stringOrNumberType)