auto cleanup will break down testing in mocha & esm environment

[DaveWelling]

• react-hooks-testing-library version: 3.2.1
• react-test-renderer version: 16.9.0
• react version: 16.13.1
• node version: 10.13.0
• npm (or yarn) version: 6.9.0

Relevant code or config:

The problem is exactly this:
testing-library/react-testing-library#614
but with this package instead of the react-testing-library
And the solution is the exactly the same (I tested it by hacking the node_modules).

Go into the flush-microtasks.js file and literally change this:
enqueueTask = nodeRequire('timers').setImmediate;
to this:
enqueueTask = nodeRequire.call(module, 'timers').setImmediate

What you did:

Run any mocha test using the react-hooks-testing-library and using esm.

What happened:

The library hangs the mocha tester if you are using esm.

Reproduction:

Run any test at all with this library, mocha and esm.

Problem description:

You get this error message (from flush-microtasks.js):
This browser does not have a MessageChannel implementation, ' + 'so enqueuing tasks via await act(async () => ...) will fail. ' + 'Please file an issue at https://github.com/facebook/react/issues ' + 'if you encounter this warning.'

It hangs the cleanup (for instance mocha afterEach will never finish).

Suggested solution:

Go into the flush-microtasks.js file and literally change this:
enqueueTask = nodeRequire('timers').setImmediate;
to this:
enqueueTask = nodeRequire.call(module, 'timers').setImmediate

[mpeyper]

I see. I stole my implementation from react-testing-library in the first place, so bringing it inline with their updates is a good idea.

Fancy submitting a PR to fix this up?

[DaveWelling]

Per your request, I have submittted an PR. #377