From dd95844fed7d514b9ff47a20bb31eb2d66c73549 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Wed, 8 Sep 2021 13:57:45 +0200
Subject: [PATCH 1/2] fix: transform code for code coverage async if possible

---
 .../src/generateEmptyCoverage.ts               | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/packages/jest-reporters/src/generateEmptyCoverage.ts b/packages/jest-reporters/src/generateEmptyCoverage.ts
index f9e43c8099c2..3d7f13a08db8 100644
--- a/packages/jest-reporters/src/generateEmptyCoverage.ts
+++ b/packages/jest-reporters/src/generateEmptyCoverage.ts
@@ -69,13 +69,17 @@ export default async function (
     const scriptTransformer = await createScriptTransformer(config);
 
     // Transform file with instrumentation to make sure initial coverage data is well mapped to original code.
-    const {code} = scriptTransformer.transformSource(filename, source, {
-      instrument: true,
-      supportsDynamicImport: true,
-      supportsExportNamespaceFrom: true,
-      supportsStaticESM: true,
-      supportsTopLevelAwait: true,
-    });
+    const {code} = await scriptTransformer.transformSourceAsync(
+      filename,
+      source,
+      {
+        instrument: true,
+        supportsDynamicImport: true,
+        supportsExportNamespaceFrom: true,
+        supportsStaticESM: true,
+        supportsTopLevelAwait: true,
+      },
+    );
     // TODO: consider passing AST
     const extracted = readInitialCoverage(code);
     // Check extracted initial coverage is not null, this can happen when using /* istanbul ignore file */

From e8f3b3230ecf4b92fe401f1d453aa412b5cef50b Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Wed, 8 Sep 2021 14:14:46 +0200
Subject: [PATCH 2/2] changelog

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e87fd503ef5f..70e8cc9f51d4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ### Fixes
 
+- `[@jest/reporters]` Use async transform if available to transform files with no coverage ([#11852](https://github.com/facebook/jest/pull/11852))
+
 ### Chore & Maintenance
 
 ### Performance