How can I safely roll back a Framer Motion animation after a layout schema change using the `animatePresence` feature?

Answering the Question First

To guarantee that a schema rollback does not leave the UI in a broken state, wrap the entire layout‑changing subtree in <AnimatePresence> and coordinate the rollback with the exit animation’s completion. The key steps are:

1. Unique keys / layoutIds: Give each layout variant a distinct key (or layoutId if the same component is reused). This lets Framer Motion detect a transition and trigger the correct exit animation.
2. State snapshot: Store the current layout version in a React state variable (e.g., const [layout, setLayout] = useState('A');) before initiating a change.
3. Trigger the change: Change the state to the new layout inside a try block. If the change involves async work, wrap that call in try/catch as well.
4. Use exitBeforeEnter: Set exitBeforeEnter on <AnimatePresence> so the new layout is not rendered until the old one’s exit animation finishes.
5. Handle completion: Provide an onExitComplete callback. If the schema change succeeded, update layout to the new value. If it failed, reset it to the previously stored snapshot.

Example

import { AnimatePresence, motion } from "framer-motion";

const LayoutSwitcher = () => {
  const [layout, setLayout] = useState('A'); // current layout
  const [prevLayout, setPrevLayout] = useState('A'); // snapshot for rollback

  const switchTo = async (newLayout) => {
    setPrevLayout(layout); // keep a copy
    try {
      // simulate a schema change that might fail
      await performSchemaChange(newLayout);
      setLayout(newLayout); // commit only after success
    } catch (e) {
      // rollback on error
      setLayout(prevLayout);
    }
  };

  return (
    <AnimatePresence exitBeforeEnter onExitComplete={() => {/* nothing needed here */}}>
      {layout === 'A' && (
        <motion.div key="A" initial={{ opacity: 0 }} animate={{ opacity: 1 }} exit={{ opacity: 0 }}>Layout A</motion.div>
      )}
      {layout === 'B' && (
        <motion.div key="B" initial={{ opacity: 0 }} animate={{ opacity: 1 }} exit={{ opacity: 0 }}>Layout B</motion.div>
      )}
    </AnimatePresence>
  );
};

Assumptions & Uncertainty

• Framer Motion v5 or later is used.
• The schema change is triggered by a synchronous or async function that can throw.
• The component tree is shallow enough that exitBeforeEnter does not cause layout thrashing.
• All animated components receive unique key props; duplicate keys would break the exit animation.

If your change involves heavy async work (e.g., fetching data), make sure the rollback logic is inside the catch block of that async call. Also keep the <AnimatePresence> wrapper in place for future transitions.

Verification Checklist

• Render the component, trigger a schema change that throws, and confirm that the exit animation plays fully before the old layout re‑appears.
• Inspect the DOM after onExitComplete fires to ensure the new layout’s nodes are removed.
• Use React DevTools to verify that the layout state variable reverts to its previous value when a rollback occurs.