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This exposes, but does not yet implement, a new experimental API called
useFormState. It's gated behind the enableAsyncActions flag.
useFormState has a similar signature to useReducer, except instead of a
reducer it accepts an (async) action function. React will wait until the
promise resolves before updating the state:
```js
async function action(prevState, payload) {
// ..
}
const [state, dispatch] = useFormState(action, initialState)
```
When used in combination with Server Actions, it will also support
progressive enhancement — a form that is submitted before it has
hydrated will have its state transferred to the next page. However, like
the other action-related hooks, it works with fully client-driven
actions, too.