Aran Roig
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23 lines
976 B
TypeScript
23 lines
976 B
TypeScript
// Helpers to keep heavy WebGL scene setup off the page's critical path.
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// Runs fn once the main thread is idle (falling back to a short timeout),
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// returning a cancel handle so an early unmount never leaks a scheduled init.
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export const scheduleIdle = (fn: () => void, timeout = 1500): (() => void) => {
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const ric = (window as any).requestIdleCallback as
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| ((cb: () => void, opts?: { timeout: number }) => number)
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| undefined
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if (typeof ric === 'function') {
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const id = ric(fn, { timeout })
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return () => (window as any).cancelIdleCallback?.(id)
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}
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const id = setTimeout(fn, 200)
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return () => clearTimeout(id)
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}
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// Calls cb whenever tab visibility changes, returning an unsubscribe function.
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export const onVisibility = (cb: (hidden: boolean) => void): (() => void) => {
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const handler = () => cb(document.hidden)
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document.addEventListener('visibilitychange', handler)
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return () => document.removeEventListener('visibilitychange', handler)
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}
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