(Alleged) Leaked source of Claude Code
1import { type DOMElement, useAnimationFrame, useTerminalFocus } from '../ink.js'
2
3const BLINK_INTERVAL_MS = 600
4
5/**
6 * Hook for synchronized blinking animations that pause when offscreen.
7 *
8 * Returns a ref to attach to the animated element and the current blink state.
9 * All instances blink together because they derive state from the same
10 * animation clock. The clock only runs when at least one subscriber is visible.
11 * Pauses when the terminal is blurred.
12 *
13 * @param enabled - Whether blinking is active
14 * @returns [ref, isVisible] - Ref to attach to element, true when visible in blink cycle
15 *
16 * @example
17 * function BlinkingDot({ shouldAnimate }) {
18 * const [ref, isVisible] = useBlink(shouldAnimate)
19 * return <Box ref={ref}>{isVisible ? '●' : ' '}</Box>
20 * }
21 */
22export function useBlink(
23 enabled: boolean,
24 intervalMs: number = BLINK_INTERVAL_MS,
25): [ref: (element: DOMElement | null) => void, isVisible: boolean] {
26 const focused = useTerminalFocus()
27 const [ref, time] = useAnimationFrame(enabled && focused ? intervalMs : null)
28
29 if (!enabled || !focused) return [ref, true]
30
31 // Derive blink state from time - all instances see the same time so they sync
32 const isVisible = Math.floor(time / intervalMs) % 2 === 0
33 return [ref, isVisible]
34}