How useTransition work under the hood?

useTransition is part of React's Concurrent Rendering model introduced in React 18.

React’s Concurrent Rendering allows the React Scheduler to prioritize updates and handle rendering more flexibly. It enables React to:

• Pause rendering tasks.
• Interrupt lower-priority tasks to handle urgent ones.
• Resume tasks where they left off.
• Discard tasks if they are no longer needed.

Under the hood, useTransition:

• Marks updates as low-priority using React's Fiber architecture.
• Allows React to prioritize urgent tasks using the React Scheduler.
• Defers non-urgent updates until idle time to keep the UI responsive.
• Pauses, interrupts, and resumes rendering as needed, ensuring smooth transitions.