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Typing of `act` broken

See original GitHub issue

Describe the bug

The act function exported by @testing-library/react-native is always of type (callback: () => void) => void. However, the underlying function coming from react-test-renderer also has overloads for promises which are incorrectly suppressed.

This error in typing leads to linter errors when one tries to pass promise-returning callbacks to act or tries to await a promise-returning act.

Expected behavior

The act function should have the same typing as the underlying function from react-test-renderer.

Steps to Reproduce

The following snippet will produce linter errors such as this one, depending on one’s linter configuration.

import { act } from '@testing-library/react-native'

await act(async () => {
  await Promise.resolve();


@testing-library/react-native: ^11.3.0 => 11.3.0 
react: 18.0.0 => 18.0.0 
react-native: 0.69.6 => 0.69.6 
react-test-renderer: ^18.2.0 => 18.2.0

Issue Analytics

  • State:open
  • Created a year ago
  • Reactions:3
  • Comments:9 (3 by maintainers)

github_iconTop GitHub Comments

AugustinLFcommented, Nov 3, 2022

OK, I can open a PR but it seems I don’t have permissions to create a branch.

You’ll need to fork the repo and create a branch there. You’ll then be able to create a PR back to this repo from yours.

Please modify both the TS and flow types 😃

AugustinLFcommented, Dec 8, 2022

I’m struggling with time right now, got a lot going on at work, so won’t be able to do that right now 😞 (and I’m not personally impacted because we use the types of RTL’s act).

Read more comments on GitHub >

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