As of Nov. 15 2021 React 18 is in beta. The official v18 release is expected soon. The react team has stated, "Since concurrency in React 18 is opt-in, there are no significant out-of-the-box breaking changes to component behavior. You can upgrade to React 18 with minimal or no changes to your application code". For more information on React 18 see this article: https://reactjs.org/blog/2021/06/08/the-plan-for-react-18.html.

Currently Grommet is compatible with React ^16.6.1 and ^17.0.0. Grommet is planning to adopt React 18 but not use any of the opt-in features that would cause breaking changes. This will allow us to continue supporting React ^16.6.1 and ^17.0.0 in addition to React 18.0.0.

Action Items:

• Test upgrading to the React 18 beta with Grommet. Confirm that storybook and unit tests are all working correctly.
• Upgrade to React 18 when it is officially released.
• Upgrade @testing-library/react from v12 to v13