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Rendering Activity

Source: .agents/references/coding-standard/vercel-react-best-practices/rules/rendering-activity.md

Metadata​

  • title: Use Activity Component for Show/Hide
  • impact: MEDIUM
  • impactDescription: preserves state/DOM
  • tags: rendering, activity, visibility, state-preservation

Content​

Use Activity Component for Show/Hide​

Use React's <Activity> to preserve state/DOM for expensive components that frequently toggle visibility.

Usage:

import { Activity } from 'react'

function Dropdown({ isOpen }: Props) {
  return (
    <Activity mode={isOpen ? 'visible' : 'hidden'}>
      <ExpensiveMenu />
    </Activity>
  )
}

Avoids expensive re-renders and state loss.