From 9984ba12facddf3170ebc73ac31765ca50dcf343 Mon Sep 17 00:00:00 2001
From: Mitchell Hentges
 <110673802+mitchhentgesspotify@users.noreply.github.com>
Date: Sat, 8 Oct 2022 07:34:42 +0200
Subject: [PATCH] perf: don't perform V8 instrumenting if !collectCoverage
 (#13282)

---
 CHANGELOG.md                        | 2 ++
 packages/jest-runner/src/runTest.ts | 1 +
 2 files changed, 3 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 951c09c72854..245196b27fb8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@
 
 ### Performance
 
+- `[jest-runner]` Do not instrument v8 coverage data if coverage should not be collected [#13282](https://github.com/facebook/jest/pull/13282)
+
 ## 29.1.2
 
 ### Fixes
diff --git a/packages/jest-runner/src/runTest.ts b/packages/jest-runner/src/runTest.ts
index 8a1d045f27e2..cd5d613864ba 100644
--- a/packages/jest-runner/src/runTest.ts
+++ b/packages/jest-runner/src/runTest.ts
@@ -280,6 +280,7 @@ async function runTestInternal(
 
   // if we don't have `getVmContext` on the env skip coverage
   const collectV8Coverage =
+    globalConfig.collectCoverage &&
     globalConfig.coverageProvider === 'v8' &&
     typeof environment.getVmContext === 'function';