onCleanup

Registers a cleanup function. It runs before the owning effect re-runs and when the component is destroyed.

import { onCleanup } from '@barefootjs/client'

onCleanup(fn: () => void): void

createEffect(() => {
  const timer = setInterval(() => console.log('tick'), 1000)
  onCleanup(() => clearInterval(timer))
})

On re-run the previous interval is cleared before a new one is created. onCleanup can be called several times in one effect; cleanups run in reverse registration order (last registered, first called).

#Where it works

onCleanup needs a reactive context:

• inside createEffect
• inside onMount
• during component initialization (runs when the component is destroyed)

Outside these it is a no-op.