source: imaps-frontend/node_modules/throttle-debounce/umd/index.js@ d565449

(function (global, factory) {
        typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
        typeof define === 'function' && define.amd ? define(['exports'], factory) :
        (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.throttleDebounce = {}));
}(this, (function (exports) { 'use strict';

        /* 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.
         */
        function throttle (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.
           */
          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() {
            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() {
            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 (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;
        }

        /* 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  {boolean}  [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).
         * @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.
         *
         * @returns {Function} A new, debounced function.
         */

        function debounce (delay, atBegin, callback) {
          return callback === undefined ? throttle(delay, atBegin, false) : throttle(delay, callback, atBegin !== false);
        }

        exports.debounce = debounce;
        exports.throttle = throttle;

        Object.defineProperty(exports, '__esModule', { value: true });

})));
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