Memory leak when running multiple tests

[vojto]

Describe your environment

• Operating System version: macOS 12.6
• Browser version: (no browser)
• Firebase SDK version: 9.11.0
• Firebase Product: firestore@9.11.0, firebase-tools@11.14.1

Describe the problem

Testing code that uses Firestore Web SDK doesn't clean up memory between tests. Using firestore.terminate() or firebase.deleteApp doesn't help.

Steps to reproduce:

Clone repo firebase-leak-repro and run yarn test. The process will run out of memory.

Relevant Code:

Given many tests (tested with 50) that look like this:

import { db, app } from "./firebase";
import * as firebase from "@firebase/app";
import * as firestore from "@firebase/firestore";

describe("leak", () => {
  it("leaks", async () => {
    const leaksRef = firestore.collection(db, "leaks");
    const leakRef = firestore.doc(leaksRef, "leak" + Math.random());

    await firestore.setDoc(leakRef, { foo: "bar" });

    await firestore.terminate(db);
    await firebase.deleteApp(app);
  });
});

Process will run out of memory, even though we're cleaning up db and app.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[vojto]

I tried running this all in one test, and couldn't reproduce the leak that way. It could be a Jest issue - see also:

• Memory Leak on ridiculously simple repo jestjs/jest#7874
• [Bug]: Memory consumption issues on Node JS 16.11.0+ jestjs/jest#11956

However, in the issues above, it sounds like downgrading from 16.17 to 16.10 fixed the problems. I'm seeing the leaks on all Node versions - 14, 16.10 and 16.17.

[vojto]

This seems to be a Jest issue. We switched to Vitest, and not seeing memory leaking anymore. Closing.