Function settle

apps/sim/lib/core/utils/multipart.ts:147–152

(fn: () => void)

    }

    const settle = (fn: () => void) => {
      if (settled) return
      settled = true
      cleanup()
      fn()
    }

    if (signal?.aborted) {
      // `destroy()` with no reason emits 'close', not an unhandled 'error'.