oppi.li
source dump of claude code
1import { useState } from 'react'
2import { useInterval } from 'usehooks-ts'
3
4export type MemoryUsageStatus = 'normal' | 'high' | 'critical'
5
6export type MemoryUsageInfo = {
7 heapUsed: number
8 status: MemoryUsageStatus
9}
10
11const HIGH_MEMORY_THRESHOLD = 1.5 * 1024 * 1024 * 1024 // 1.5GB in bytes
12const CRITICAL_MEMORY_THRESHOLD = 2.5 * 1024 * 1024 * 1024 // 2.5GB in bytes
13
14/**
15 * Hook to monitor Node.js process memory usage.
16 * Polls every 10 seconds; returns null while status is 'normal'.
17 */
18export function useMemoryUsage(): MemoryUsageInfo | null {
19 const [memoryUsage, setMemoryUsage] = useState<MemoryUsageInfo | null>(null)
20
21 useInterval(() => {
22 const heapUsed = process.memoryUsage().heapUsed
23 const status: MemoryUsageStatus =
24 heapUsed >= CRITICAL_MEMORY_THRESHOLD
25 ? 'critical'
26 : heapUsed >= HIGH_MEMORY_THRESHOLD
27 ? 'high'
28 : 'normal'
29 setMemoryUsage(prev => {
30 // Bail when status is 'normal' — nothing is shown, so heapUsed is
31 // irrelevant and we avoid re-rendering the whole Notifications subtree
32 // every 10 seconds for the 99%+ of users who never reach 1.5GB.
33 if (status === 'normal') return prev === null ? prev : null
34 return { heapUsed, status }
35 })
36 }, 10_000)
37
38 return memoryUsage
39}