Memory leak reported by Jest

[tmorell]

Describe the bug

• Node.js version: 14.8.0
• OS & version: Manjaro 5.4.67

Actual behavior

Jest is reporting a memory leak, "Your test suite is leaking memory.".

Expected behavior

There should be no such report.

Code to reproduce

import got from "got";

test("just a test", () => {
    expect(true).toBeTruthy();
});

// Not even called, but forcing load
function loadIt(): void {
    console.log(got.name);
}

It does not happen with other packages, for example replacing got with express or Mongodb.

Using:
Jest: 26.6.1
ts-jest: 26.4.3

jest.config.js

module.exports = {
    preset: 'ts-jest',
    testEnvironment: 'node'
};

Checklist

• I have read the documentation.
• I have tried my code with the latest version of Node.js and Got.

[sindresorhus]

What exactly is leaking? Does Jest show a trace log or something? There's nothing actionable in this report. Jest has also had many false-positives with the memory leak reporting in the past.

[tmorell]

I was able to trace it to this specific global reference:
./source/core/index.ts

const globalDnsCache = new CacheableLookup();

[szmarczak]

There is no memory leak, it's a false-positive by Jest. Related with jestjs/jest#9982