In ReactJS, flushSync is a function that you would use to force React to flush any updates inside the provided callback synchronously, ensuring that the DOM is updated immediately. This function is part of the react-dom package and is typically used in scenarios where you need to ensure that the state updates are reflected in the DOM before the next line of code runs.
Here are some specific situations where you might use flushSync:
Integrating with Third-Party Code: When working with browser APIs or UI libraries that expect the DOM to be updated synchronously within a callback, flushSync can be used to meet these expectations[2][7].
Handling Immediate Updates: In cases where the timing of an update is critical, such as ensuring smooth operation in a chat application where messages need to be displayed immediately, flushSync can be used to bypass React's batching behavior and apply updates right away[1].
Preventing Inconsistencies: When you need to prevent "half-finished" states in your component by ensuring that all state updates within an event cycle are rendered immediately, flushSync can be used to avoid bugs that may arise from asynchronous state updates[3].
User Experience Enhancements: For enhancing user experience by making an app feel faster and more responsive, flushSync can be used to apply critical updates immediately, such as scrolling to the bottom of a list when a new item is added[1].
However, it is important to use flushSync sparingly...
