perf: don't perform V8 instrumenting if !collectCoverage (#13282)

jestjs · Oct 8, 2022 · 9984ba1 · 9984ba1
1 parent f126336
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diff --git 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
@@ -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';