function useMemoizedFn()

in packages/hooks/src/useMemoizedFn/index.ts [12:33]

• 13 lines of code
• 4 McCabe index (conditional complexity)

function useMemoizedFn<T extends noop>(fn: T) {
  if (isDev) {
    if (!isFunction(fn)) {
      console.error(`useMemoizedFn expected parameter is a function, got ${typeof fn}`);
    }
  }

  const fnRef = useRef<T>(fn);

  // why not write `fnRef.current = fn`?
  // https://github.com/alibaba/hooks/issues/728
  fnRef.current = useMemo<T>(() => fn, [fn]);

  const memoizedFn = useRef<PickFunction<T>>();
  if (!memoizedFn.current) {
    memoizedFn.current = function (this, ...args) {
      return fnRef.current.apply(this, args);
    };
  }

  return memoizedFn.current as PickFunction<T>;
}