fix: skip ELDHISTOGRAM for --detectOpenHandles

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Fixes
 
+- `[jest-core]` Don't report ELDHistogram as open handle ([#10417](https://github.com/facebook/jest/pull/10417))
 - `[jest-matcher-utils]` Fix diffing object contain readonly symbol key object ([#10414](https://github.com/facebook/jest/pull/10414))
 - `[jest-reporters]` Fixes notify reporter on Linux (using notify-send) ([#10393](https://github.com/facebook/jest/pull/10400))
 - `[jest-snapshot]` Correctly handles arrays and property matchers in snapshots ([#10404](https://github.com/facebook/jest/pull/10404))

e2e/__tests__/detectOpenHandles.ts

@@ -71,6 +71,18 @@ it('does not report promises', () => {
   expect(textAfterTest).toBe('');
 });
 
+onNodeVersions('>=11.10.0', () => {
+  it('does not report ELD histograms', () => {
+    const {stderr} = runJest('detect-open-handles', [
+      'histogram',
+      '--detectOpenHandles',
+    ]);
+    const textAfterTest = getTextAfterTest(stderr);
+
+    expect(textAfterTest).toBe('');
+  });
+});
+
 describe('notify', () => {
   it('does not report --notify flag', () => {
     if (process.platform === 'win32') {

e2e/detect-open-handles/__tests__/histogram.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+const {monitorEventLoopDelay} = require('perf_hooks');
+
+test('something', () => {
+  const histogram = monitorEventLoopDelay();
+  histogram.enable();
+  expect(true).toBe(true);
+});

packages/jest-core/src/collectHandles.ts

@@ -52,7 +52,11 @@ export default function collectHandles(): () => Array<Error> {
       _triggerAsyncId,
       resource: {} | NodeJS.Timeout,
     ) {
-      if (type === 'PROMISE' || type === 'TIMERWRAP') {
+      if (
+        type === 'PROMISE' ||
+        type === 'TIMERWRAP' ||
+        type === 'ELDHISTOGRAM'
+      ) {
         return;
       }
       const error = new ErrorWithStack(type, initHook);