-* `action`: A function that updates some state by calling one or more [`set` functions](/reference/react/useState#setstate). React calls `action` immediately with no parameters and marks all state updates scheduled synchronously during the `action` function call as Transitions. Any async calls that are awaited in the `action` will be included in the Transition, but currently require wrapping any `set` functions after the `await` in an additional `startTransition` (see [Troubleshooting](#react-doesnt-treat-my-state-update-after-await-as-a-transition)). State updates marked as Transitions will be [non-blocking](#marking-a-state-update-as-a-non-blocking-transition) and [will not display unwanted loading indicators](#preventing-unwanted-loading-indicators).
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