text: /* eslint-disable no-undefined,no-param-reassign,no-shadow */
  
  /**
   * Throttle execution of a function. Especially useful for rate limiting
   * execution of handlers on events like resize and scroll.
   *
   * @param  {number}    delay -          A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.
   * @param  {boolean}   [noTrailing] -   Optional, defaults to false. If noTrailing is true, callback will only execute every `delay` milliseconds while the
   *                                    throttled-function is being called. If noTrailing is false or unspecified, callback will be executed one final time
   *                                    after the last throttled-function call. (After the throttled-function has not been called for `delay` milliseconds,
   *                                    the internal counter is reset).
   * @param  {Function}  callback -       A function to be executed after delay milliseconds. The `this` context and all arguments are passed through, as-is,
   *                                    to `callback` when the throttled-function is executed.
   * @param  {boolean}   [debounceMode] - If `debounceMode` is true (at begin), schedule `clear` to execute after `delay` ms. If `debounceMode` is false (at end),
   *                                    schedule `callback` to execute after `delay` ms.
   *
   * @returns {Function}  A new, throttled, function.
   */
  export default function (delay, noTrailing, callback, debounceMode) {
  	/*
  	 * After wrapper has stopped being called, this timeout ensures that
  	 * `callback` is executed at the proper times in `throttle` and `end`
  	 * debounce modes.
  	 */
  	let timeoutID;
  	let cancelled = false;
  
  	// Keep track of the last time `callback` was executed.
  	let lastExec = 0;
  
  	// Function to clear existing timeout
  	function clearExistingTimeout() {
  		if (timeoutID) {
  			clearTimeout(timeoutID);
  		}
  	}
  
  	// Function to cancel next exec
  	function cancel() {
  		clearExistingTimeout();
  		cancelled = true;
  	}
  
  	// `noTrailing` defaults to falsy.
  	if (typeof noTrailing !== 'boolean') {
  		debounceMode = callback;
  		callback = noTrailing;
  		noTrailing = undefined;
  	}
  
  	/*
  	 * The `wrapper` function encapsulates all of the throttling / debouncing
  	 * functionality and when executed will limit the rate at which `callback`
  	 * is executed.
  	 */
  	function wrapper(...arguments_) {
  		let self = this;
  		let elapsed = Date.now() - lastExec;
  
  		if (cancelled) {
  			return;
  		}
  
  		// Execute `callback` and update the `lastExec` timestamp.
  		function exec() {
  			lastExec = Date.now();
  			callback.apply(self, arguments_);
  		}
  
  		/*
  		 * If `debounceMode` is true (at begin) this is used to clear the flag
  		 * to allow future `callback` executions.
  		 */
  		function clear() {
  			timeoutID = undefined;
  		}
  
  		if (debounceMode && !timeoutID) {
  			/*
  			 * Since `wrapper` is being called for the first time and
  			 * `debounceMode` is true (at begin), execute `callback`.
  			 */
  			exec();
  		}
  
  		clearExistingTimeout();
  
  		if (debounceMode === undefined && elapsed > delay) {
  			/*
  			 * In throttle mode, if `delay` time has been exceeded, execute
  			 * `callback`.
  			 */
  			exec();
  		} else if (noTrailing !== true) {
  			/*
  			 * In trailing throttle mode, since `delay` time has not been
  			 * exceeded, schedule `callback` to execute `delay` ms after most
  			 * recent execution.
  			 *
  			 * If `debounceMode` is true (at begin), schedule `clear` to execute
  			 * after `delay` ms.
  			 *
  			 * If `debounceMode` is false (at end), schedule `callback` to
  			 * execute after `delay` ms.
  			 */
  			timeoutID = setTimeout(
  				debounceMode ? clear : exec,
  				debounceMode === undefined ? delay - elapsed : delay
  			);
  		}
  	}
  
  	wrapper.cancel = cancel;
  
  	// Return the wrapper function.
  	return wrapper;
  }