useBeforeMount

useBeforeMount is a React equivalent adaptation of Vue's onBeforeMount, implemented based on useLayoutEffect during the initial mounting phase.

Basic Usage

This hook is suitable for placing logic that "runs closely to the layout phase right before and after the first render", such as preparing DOM-related data in advance.

useBeforeMount(() => {
  console.log('before mount');

  return () => {
    console.log('cleanup on unmount');
  };
});

In this code snippet: the callback is executed during the initial mount, and the returned cleanup function is executed when the component is unmounted.

API

function useBeforeMount(fn: EffectCallback): void;

Notes

• Executes only once.
• Executes earlier than the regular useEffect.
• Can return a cleanup function.