From 768f59296d0a0c087ffbf4b03789a0e8760b608b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sampo=20Kivist=C3=B6?= <sampo.kivisto@live.fi>
Date: Thu, 24 Aug 2023 02:06:20 +0300
Subject: [PATCH] perf: reduce GC pressure by hoisting script target features
 object (#55484)

Co-authored-by: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
---
 src/compiler/utilities.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 2edd5b0243b..9a757e7e26a 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -386,6 +386,7 @@ import {
     mapDefined,
     MapLike,
     MemberName,
+    memoize,
     MetaProperty,
     MethodDeclaration,
     MethodSignature,
@@ -1281,8 +1282,8 @@ export function getInternalEmitFlags(node: Node): InternalEmitFlags {
 export type ScriptTargetFeatures = ReadonlyMap<string, ReadonlyMap<string, string[]>>;
 
 /** @internal */
-export function getScriptTargetFeatures(): ScriptTargetFeatures {
-    return new Map(Object.entries({
+export const getScriptTargetFeatures = /* @__PURE__ */ memoize((): ScriptTargetFeatures =>
+    new Map(Object.entries({
         Array: new Map(Object.entries({
             es2015: [
                 "find",
@@ -1675,8 +1676,8 @@ export function getScriptTargetFeatures(): ScriptTargetFeatures {
                 "cause",
             ],
         })),
-    }));
-}
+    }))
+);
 
 /** @internal */
 export const enum GetLiteralTextFlags {