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

For reference, could this be a proposed solution so that the timer is cleared when Promise.race is satisfied?

https://stackoverflow.com/questions/30936824/what-is-the-best-general-practice-to-timeout-a-function-in-promise

export function race({promise, timeout, error}) {
  let timer = null;

  return Promise.race([
    new Promise((resolve, reject) => {
      timer = setTimeout(reject, timeout, error);
      return timer;
    }),
    promise.then((value) => {
      clearTimeout(timer);
      return value;
    })
  ]);
}

@stevecastaneda issue #2746 mentions the issue only manifests in Node. Is your issue also happening in Nodejs (server rendering)? Just want to clarify because you include React code, also that I can't reproduce it in browser.

@Feiyang1 Thanks for looking at this for me.

I'm running React locally along with emulated firebase functions. Interestingly enough, I just noticed that after deploying the site to a host along with functions to Firebase, I don't get the error anymore. (the deployed site is using firebase functions vs. local emulated functions, same code though).

So perhaps this is isolated to running a local build of React?

I could possibly reproduce if we start a new project at Firebase, connect it to a fresh install of React, emulate a simple function locally. I'm just not 100% sure how I'd share that if the project is built on my Google login.

Another thought is that maybe it could be an emulated function and not react. I'm going to try using the deployed function instead to see if the locally running React build throws the error...

Using the deployed function still threw the error, so it looks like the culprit is the local build of React that I'm running. This is create-react-app with Typescript. I start the server using react-scripts start.

Nevermind. It's also happening on the deployed site, unfortunately. Tested by adding a 10-second timeout to the callable function (that did return well before that).

Any recommendations on how I can help diagnose this issue?

Would you mind sharing the deployed site?

@Feiyang1 I have a repro for the bug at the end of #2746. I was hoping my comment would reopen the bug but unfortunately it didn't.

@minism Thanks!

@Feiyang1 If you can't reproduce there, let me know and I can create a new CRA site and deploy it for testing.

I'm able to trigger this error even with the simplest of callable functions. Here's an example:

https://gist.github.com/stevecastaneda/7c07f91ce1eeef005175071efda39401

#3330 should resolve the issue.

@Feiyang1 Thank you!