Remove usage of unsafe lifecycle hooks (React 16.3)

[saadq]

Bug, Feature, or Question?

Feature?

Current Behavior

Using Formik with React 16.3 with the <React.StrictMode></React.StrictMode> component will trigger some warnings.

Desired Behavior

Different lifecycle hooks should be used.

Suggested Solutions

The warning message states:

Warning: Unsafe lifecycle methods were found within a strict-mode tree:

componentWillMount: Please update the following components to use componentDidMount instead: Field, Formik
componentWillReceiveProps: Please update the following components to use static getDerivedStateFromProps instead: Formik

The React team also made react-lifecycles-compat which should allow for backwards compatibility when using the new lifecycle hooks.

Additional Information

More details are in the recent React blog post.

[jaredpalmer]

There is a large rewrite required for 16.3. But the great news is that it will make Formik MUCH smaller, simplify tooling (microbundle), and no longer have prop-types as a peer dep.

[mikelax]

@jaredpalmer is the large rewrite you are talking about here PR #423 ?
We are happily using formik in a couple of projects, and would like to put a plan to get them moved to 16.3, but we want that to be coordinated with the new release of formik.

Where should we "track progress", on that PR, or elsewhere?
Let us know if there is any help needed once you have an RC, etc.

[jaredpalmer]

Yes that was my first attempt. Just need time to finish it up.

[stale]

Hola! So here's the deal, between open source and my day job and life and what not, I have a lot to manage, so I use a GitHub bot to automate a few things here and there. This particular GitHub bot is going to mark this as stale because it has not had recent activity for a while. It will be closed if no further activity occurs in a few days. Do not take this personally--seriously--this is a completely automated action. If this is a mistake, just make a comment, DM me, send a carrier pidgeon, or a smoke signal.

[colinrobertbrooks]

📌

[stale]

Hola! So here's the deal, between open source and my day job and life and what not, I have a lot to manage, so I use a GitHub bot to automate a few things here and there. This particular GitHub bot is going to mark this as stale because it has not had recent activity for a while. It will be closed if no further activity occurs in a few days. Do not take this personally--seriously--this is a completely automated action. If this is a mistake, just make a comment, DM me, send a carrier pidgeon, or a smoke signal.

[saadq]

📌