fix: optimize getGlobalCacheKey (#14455)

Author: Connormiha

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 ### Fixes
 
+### Performance
+
+- `[@jest/create-cache-key-function]` Cache access of `NODE_ENV` and `BABEL_ENV` ([#14455](https://github.com/jestjs/jest/pull/14455))
+
 ### Chore & Maintenance
 
 ## 29.6.4

packages/jest-create-cache-key-function/src/index.ts

@@ -40,14 +40,16 @@ type NewGetCacheKeyFunction = (
 
 type GetCacheKeyFunction = OldGetCacheKeyFunction | NewGetCacheKeyFunction;
 
+const {NODE_ENV, BABEL_ENV} = process.env;
+
 function getGlobalCacheKey(
   files: Array<string>,
   values: Array<string>,
   length: number,
 ) {
   return [
-    process.env.NODE_ENV,
-    process.env.BABEL_ENV,
+    NODE_ENV,
+    BABEL_ENV,
     ...values,
     ...files.map((file: string) => readFileSync(file)),
   ]