jiuyiUniapp/jiuyi2/TUIKit/utils/lodash.ts

// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-nocheck
/** Error message constants. */
const FUNC_ERROR_TEXT = 'Expected a function';

interface IDebounceOptions {
  leading?: boolean;
  maxWait?: number;
  trailing?: boolean;
}

type IThrottleOptions = IDebounceOptions;

function throttle(func, wait: number, options?: IThrottleOptions) {
  let leading = true,
    trailing = true;

  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  if (options && isObject(options)) {
    leading = 'leading' in options ? !!options.leading : leading;
    trailing = 'trailing' in options ? !!options.trailing : trailing;
  }
  return debounce(func, wait, {
    leading: leading,
    maxWait: wait,
    trailing: trailing,
  });
}

function debounce(func, wait: number, options?: IDebounceOptions) {
  let lastArgs,
    lastThis,
    maxWait,
    result,
    timerId,
    lastCallTime,
    lastInvokeTime = 0,
    leading = false,
    maxing = false,
    trailing = true;

  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  wait = wait || 0;
  if (options && isObject(options)) {
    leading = !!options.leading;
    maxing = 'maxWait' in options;
    maxWait = maxing ? Math.max(options.maxWait || 0, wait) : maxWait;
    trailing = 'trailing' in options ? !!options.trailing : trailing;
  }

  function invokeFunc(time) {
    const args = lastArgs,
      thisArg = lastThis;

    lastArgs = lastThis = undefined;
    lastInvokeTime = time;
    result = func.apply(thisArg, args);
    return result;
  }

  function leadingEdge(time) {
    // Reset any `maxWait` timer.
    lastInvokeTime = time;
    // Start the timer for the trailing edge.
    timerId = setTimeout(timerExpired, wait);
    // Invoke the leading edge.
    return leading ? invokeFunc(time) : result;
  }

  function remainingWait(time) {
    const timeSinceLastCall = time - lastCallTime,
      timeSinceLastInvoke = time - lastInvokeTime,
      timeWaiting = wait - timeSinceLastCall;

    return maxing
      ? Math.min(timeWaiting, maxWait - timeSinceLastInvoke)
      : timeWaiting;
  }

  function shouldInvoke(time) {
    const timeSinceLastCall = time - lastCallTime,
      timeSinceLastInvoke = time - lastInvokeTime;

    // Either this is the first call, activity has stopped and we're at the
    // trailing edge, the system time has gone backwards and we're treating
    // it as the trailing edge, or we've hit the `maxWait` limit.
    return (lastCallTime === undefined || (timeSinceLastCall >= wait)
      || (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
  }

  function timerExpired() {
    const time = Date.now();
    if (shouldInvoke(time)) {
      return trailingEdge(time);
    }
    // Restart the timer.
    timerId = setTimeout(timerExpired, remainingWait(time));
  }

  function trailingEdge(time) {
    timerId = undefined;

    // Only invoke if we have `lastArgs` which means `func` has been
    // debounced at least once.
    if (trailing && lastArgs) {
      return invokeFunc(time);
    }
    lastArgs = lastThis = undefined;
    return result;
  }

  function cancel() {
    if (timerId !== undefined) {
      clearTimeout(timerId);
    }
    lastInvokeTime = 0;
    lastArgs = lastCallTime = lastThis = timerId = undefined;
  }

  function flush() {
    return timerId === undefined ? result : trailingEdge(Date.now());
  }

  function debounced() {
    const time = Date.now(),
      isInvoking = shouldInvoke(time);

    // eslint-disable-next-line prefer-rest-params
    lastArgs = arguments;

    // @ts-expect-error ignore this type
    // eslint-disable-next-line @typescript-eslint/no-this-alias
    lastThis = this;
    lastCallTime = time;

    if (isInvoking) {
      if (timerId === undefined) {
        return leadingEdge(lastCallTime);
      }
      if (maxing) {
        // Handle invocations in a tight loop.
        clearTimeout(timerId);
        timerId = setTimeout(timerExpired, wait);
        return invokeFunc(lastCallTime);
      }
    }
    if (timerId === undefined) {
      timerId = setTimeout(timerExpired, wait);
    }
    return result;
  }
  debounced.cancel = cancel;
  debounced.flush = flush;
  return debounced;
}

function isObject(value) {
  const type = typeof value;
  return value != null && (type == 'object' || type == 'function');
}

export {
  debounce,
  throttle,
};