Function useMemoryUsage

src/hooks/useMemoryUsage.ts:18–39

()

 * Polls every 10 seconds; returns null while status is 'normal'.
 */
export function useMemoryUsage(): MemoryUsageInfo | null {
  const [memoryUsage, setMemoryUsage] = useState<MemoryUsageInfo | null>(null)

  useInterval(() => {
    const heapUsed = process.memoryUsage().heapUsed
    const status: MemoryUsageStatus =
      heapUsed >= CRITICAL_MEMORY_THRESHOLD
        ? 'critical'
        : heapUsed >= HIGH_MEMORY_THRESHOLD
          ? 'high'
          : 'normal'
    setMemoryUsage(prev => {
      // Bail when status is 'normal' — nothing is shown, so heapUsed is
      // irrelevant and we avoid re-rendering the whole Notifications subtree
      // every 10 seconds for the 99%+ of users who never reach 1.5GB.
      if (status === 'normal') return prev === null ? prev : null
      return { heapUsed, status }
    })
  }, 10_000)

  return memoryUsage
}