/* 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 {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 {object} [options] -              An object to configure options.
 * @param {boolean} [options.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 {boolean} [options.noLeading] -   Optional, defaults to false. If noLeading is false, the first throttled-function call will execute callback
 *                                            immediately. If noLeading is true, the first the callback execution will be skipped. It should be noted that
 *                                            callback will never executed if both noLeading = true and noTrailing = true.
 * @param {boolean} [options.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.
 */
function throttle (delay, callback, options) {
  var _ref = options || {},
      _ref$noTrailing = _ref.noTrailing,
      noTrailing = _ref$noTrailing === void 0 ? false : _ref$noTrailing,
      _ref$noLeading = _ref.noLeading,
      noLeading = _ref$noLeading === void 0 ? false : _ref$noLeading,
      _ref$debounceMode = _ref.debounceMode,
      debounceMode = _ref$debounceMode === void 0 ? undefined : _ref$debounceMode;
  /*
   * After wrapper has stopped being called, this timeout ensures that
   * `callback` is executed at the proper times in `throttle` and `end`
   * debounce modes.
   */


  var timeoutID;
  var cancelled = false; // Keep track of the last time `callback` was executed.

  var lastExec = 0; // Function to clear existing timeout

  function clearExistingTimeout() {
    if (timeoutID) {
      clearTimeout(timeoutID);
    }
  } // Function to cancel next exec


  function cancel(options) {
    var _ref2 = options || {},
        _ref2$upcomingOnly = _ref2.upcomingOnly,
        upcomingOnly = _ref2$upcomingOnly === void 0 ? false : _ref2$upcomingOnly;

    clearExistingTimeout();
    cancelled = !upcomingOnly;
  }
  /*
   * The `wrapper` function encapsulates all of the throttling / debouncing
   * functionality and when executed will limit the rate at which `callback`
   * is executed.
   */


  function wrapper() {
    for (var _len = arguments.length, arguments_ = new Array(_len), _key = 0; _key < _len; _key++) {
      arguments_[_key] = arguments[_key];
    }

    var self = this;
    var 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 (!noLeading && debounceMode && !timeoutID) {
      /*
       * Since `wrapper` is being called for the first time and
       * `debounceMode` is true (at begin), execute `callback`
       * and noLeading != true.
       */
      exec();
    }

    clearExistingTimeout();

    if (debounceMode === undefined && elapsed > delay) {
      if (noLeading) {
        /*
         * In throttle mode with noLeading, if `delay` time has
         * been exceeded, update `lastExec` and schedule `callback`
         * to execute after `delay` ms.
         */
        lastExec = Date.now();

        if (!noTrailing) {
          timeoutID = setTimeout(debounceMode ? clear : exec, delay);
        }
      } else {
        /*
         * In throttle mode without noLeading, 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;
}

/* eslint-disable no-undefined */
/**
 * Debounce execution of a function. Debouncing, unlike throttling,
 * guarantees that a function is only executed a single time, either at the
 * very beginning of a series of calls, or at the very end.
 *
 * @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 {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 debounced-function is executed.
 * @param {object} [options] -           An object to configure options.
 * @param {boolean} [options.atBegin] -  Optional, defaults to false. If atBegin is false or unspecified, callback will only be executed `delay` milliseconds
 *                                        after the last debounced-function call. If atBegin is true, callback will be executed only at the first debounced-function call.
 *                                        (After the throttled-function has not been called for `delay` milliseconds, the internal counter is reset).
 *
 * @returns {Function} A new, debounced function.
 */

function debounce (delay, callback, options) {
  var _ref = options || {},
      _ref$atBegin = _ref.atBegin,
      atBegin = _ref$atBegin === void 0 ? false : _ref$atBegin;

  return throttle(delay, callback, {
    debounceMode: atBegin !== false
  });
}

export { debounce, throttle };
                                 

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If noTrailing is true, callback will only execute every `delay` milliseconds\n *                                            while the throttled-function is being called. If noTrailing is false or unspecified, callback will be executed\n *                                            one final time after the last throttled-function call. (After the throttled-function has not been called for\n *                                            `delay` milliseconds, the internal counter is reset).\n * @param {boolean} [options.noLeading] -   Optional, defaults to false. If noLeading is false, the first throttled-function call will execute callback\n *                                            immediately. If noLeading is true, the first the callback execution will be skipped. It should be noted that\n *                                            callback will never executed if both noLeading = true and noTrailing = true.\n * @param {boolean} [options.debounceMode] - If `debounceMode` is true (at begin), schedule `clear` to execute after `delay` ms. If `debounceMode` is\n *                                            false (at end), schedule `callback` to execute after `delay` ms.\n *\n * @returns {Function} A new, throttled, function.\n */\nexport default function (delay, callback, options) {\n\tconst {\n\t\tnoTrailing = false,\n\t\tnoLeading = false,\n\t\tdebounceMode = undefined\n\t} = options || {};\n\t/*\n\t * After wrapper has stopped being called, this timeout ensures that\n\t * `callback` is executed at the proper times in `throttle` and `end`\n\t * debounce modes.\n\t */\n\tlet timeoutID;\n\tlet cancelled = false;\n\n\t// Keep track of the last time `callback` was executed.\n\tlet lastExec = 0;\n\n\t// Function to clear existing timeout\n\tfunction clearExistingTimeout() {\n\t\tif (timeoutID) {\n\t\t\tclearTimeout(timeoutID);\n\t\t}\n\t}\n\n\t// Function to cancel next exec\n\tfunction cancel(options) {\n\t\tconst { upcomingOnly = false } = options || {};\n\t\tclearExistingTimeout();\n\t\tcancelled = !upcomingOnly;\n\t}\n\n\t/*\n\t * The `wrapper` function encapsulates all of the throttling / debouncing\n\t * functionality and when executed will limit the rate at which `callback`\n\t * is executed.\n\t */\n\tfunction wrapper(...arguments_) {\n\t\tlet self = this;\n\t\tlet elapsed = Date.now() - lastExec;\n\n\t\tif (cancelled) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Execute `callback` and update the `lastExec` timestamp.\n\t\tfunction exec() {\n\t\t\tlastExec = Date.now();\n\t\t\tcallback.apply(self, arguments_);\n\t\t}\n\n\t\t/*\n\t\t * If `debounceMode` is true (at begin) this is used to clear the flag\n\t\t * to allow future `callback` executions.\n\t\t */\n\t\tfunction clear() {\n\t\t\ttimeoutID = undefined;\n\t\t}\n\n\t\tif (!noLeading && debounceMode && !timeoutID) {\n\t\t\t/*\n\t\t\t * Since `wrapper` is being called for the first time and\n\t\t\t * `debounceMode` is true (at begin), execute `callback`\n\t\t\t * and noLeading != true.\n\t\t\t */\n\t\t\texec();\n\t\t}\n\n\t\tclearExistingTimeout();\n\n\t\tif (debounceMode === undefined && elapsed > delay) {\n\t\t\tif (noLeading) {\n\t\t\t\t/*\n\t\t\t\t * In throttle mode with noLeading, if `delay` time has\n\t\t\t\t * been exceeded, update `lastExec` and schedule `callback`\n\t\t\t\t * to execute after `delay` ms.\n\t\t\t\t */\n\t\t\t\tlastExec = Date.now();\n\t\t\t\tif (!noTrailing) {\n\t\t\t\t\ttimeoutID = setTimeout(debounceMode ? clear : exec, delay);\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t/*\n\t\t\t\t * In throttle mode without noLeading, if `delay` time has been exceeded, execute\n\t\t\t\t * `callback`.\n\t\t\t\t */\n\t\t\t\texec();\n\t\t\t}\n\t\t} else if (noTrailing !== true) {\n\t\t\t/*\n\t\t\t * In trailing throttle mode, since `delay` time has not been\n\t\t\t * exceeded, schedule `callback` to execute `delay` ms after most\n\t\t\t * recent execution.\n\t\t\t *\n\t\t\t * If `debounceMode` is true (at begin), schedule `clear` to execute\n\t\t\t * after `delay` ms.\n\t\t\t *\n\t\t\t * If `debounceMode` is false (at end), schedule `callback` to\n\t\t\t * execute after `delay` ms.\n\t\t\t */\n\t\t\ttimeoutID = setTimeout(\n\t\t\t\tdebounceMode ? clear : exec,\n\t\t\t\tdebounceMode === undefined ? delay - elapsed : delay\n\t\t\t);\n\t\t}\n\t}\n\n\twrapper.cancel = cancel;\n\n\t// Return the wrapper function.\n\treturn wrapper;\n}\n","/* eslint-disable no-undefined */\n\nimport throttle from './throttle.js';\n\n/**\n * Debounce execution of a function. 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