Function removeAbortHandler

src/utils/abortController.ts:44–53

* Removes an abort handler from a weakly-referenced parent signal. * Both parent and handler are weakly held — if either has been GC'd * or the parent already aborted ({once: true}), this is a no-op. * Module-scope function avoids per-call closure allocation.

(
  this: WeakRef<AbortController>,
  weakHandler: WeakRef<(...args: unknown[]) => void>,
)

 * Module-scope function avoids per-call closure allocation.
 */
function removeAbortHandler(
  this: WeakRef<AbortController>,
  weakHandler: WeakRef<(...args: unknown[]) => void>,
): void {
  const parent = this.deref()
  const handler = weakHandler.deref()
  if (parent && handler) {
    parent.signal.removeEventListener('abort', handler)
  }
}

/**
 * Creates a child AbortController that aborts when its parent aborts.