text: /**
   * Imagify beat API
   *
   * This is a modified version of WordPress’ Heartbeat (WP 5.2.1).
   * The main difference is that it allows to prevent suspension entirely.
   * It uses the var imagifybeatSettings on init.
   *
   * Custom jQuery events:
   * - imagifybeat-send
   * - imagifybeat-tick
   * - imagifybeat-error
   * - imagifybeat-connection-lost
   * - imagifybeat-connection-restored
   * - imagifybeat-nonces-expired
   *
   * @since 1.9.3
   */
  
  window.imagify = window.imagify || {};
  
  /* eslint-disable no-use-before-define */
  (function($, d, w, undefined) { // eslint-disable-line no-unused-vars, no-shadow, no-shadow-restricted-names
  
  	/**
  	 * Constructs the Imagifybeat API.
  	 *
  	 * @since 1.9.3
  	 * @constructor
  	 *
  	 * @return {Imagifybeat} An instance of the Imagifybeat class.
  	 */
  	var Imagifybeat = function() {
  		var $document = $( d ),
  			settings  = {
  				// Suspend/resume.
  				suspend: false,
  
  				// Whether suspending is enabled.
  				suspendEnabled: true,
  
  				// Current screen id, defaults to the JS global 'pagenow' when present
  				// (in the admin) or 'front'.
  				screenId: '',
  
  				// XHR request URL, defaults to the JS global 'ajaxurl' when present.
  				url: '',
  
  				// Timestamp, start of the last connection request.
  				lastTick: 0,
  
  				// Container for the enqueued items.
  				queue: {},
  
  				// Connect interval (in seconds).
  				mainInterval: 60,
  
  				// Used when the interval is set to 5 sec. temporarily.
  				tempInterval: 0,
  
  				// Used when the interval is reset.
  				originalInterval: 0,
  
  				// Used to limit the number of AJAX requests.
  				minimalInterval: 0,
  
  				// Used together with tempInterval.
  				countdown: 0,
  
  				// Whether a connection is currently in progress.
  				connecting: false,
  
  				// Whether a connection error occurred.
  				connectionError: false,
  
  				// Used to track non-critical errors.
  				errorcount: 0,
  
  				// Whether at least one connection has been completed successfully.
  				hasConnected: false,
  
  				// Whether the current browser w is in focus and the user is active.
  				hasFocus: true,
  
  				// Timestamp, last time the user was active. Checked every 30 sec.
  				userActivity: 0,
  
  				// Flag whether events tracking user activity were set.
  				userActivityEvents: false,
  
  				// Timer that keeps track of how long a user has focus.
  				checkFocusTimer: 0,
  
  				// Timer that keeps track of how long needs to be waited before connecting to
  				// the server again.
  				beatTimer: 0
  			};
  
  		/**
  		 * Sets local variables and events, then starts the beat.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function initialize() {
  			var options, hidden, visibilityState, visibilitychange;
  
  			if ( typeof w.pagenow === 'string' ) {
  				settings.screenId = w.pagenow;
  			}
  
  			if ( typeof w.ajaxurl === 'string' ) {
  				settings.url = w.ajaxurl;
  			}
  
  			// Pull in options passed from PHP.
  			if ( typeof w.imagifybeatSettings === 'object' ) {
  				options = w.imagifybeatSettings;
  
  				// The XHR URL can be passed as option when w.ajaxurl is not set.
  				if ( ! settings.url && options.ajaxurl ) {
  					settings.url = options.ajaxurl;
  				}
  
  				/*
  				 * The interval can be from 15 to 120 sec. and can be set temporarily to 5 sec.
  				 * It can be set in the initial options or changed later through JS and/or
  				 * through PHP.
  				 */
  				if ( options.interval ) {
  					settings.mainInterval = options.interval;
  
  					if ( settings.mainInterval < 15 ) {
  						settings.mainInterval = 15;
  					} else if ( settings.mainInterval > 120 ) {
  						settings.mainInterval = 120;
  					}
  				}
  
  				/*
  				 * Used to limit the number of AJAX requests. Overrides all other intervals if
  				 * they are shorter. Needed for some hosts that cannot handle frequent requests
  				 * and the user may exceed the allocated server CPU time, etc. The minimal
  				 * interval can be up to 600 sec. however setting it to longer than 120 sec.
  				 * will limit or disable some of the functionality (like post locks). Once set
  				 * at initialization, minimalInterval cannot be changed/overridden.
  				 */
  				if ( options.minimalInterval ) {
  					options.minimalInterval  = parseInt( options.minimalInterval, 10 );
  					settings.minimalInterval = options.minimalInterval > 0 && options.minimalInterval <= 600 ? options.minimalInterval * 1000 : 0;
  				}
  
  				if ( settings.minimalInterval && settings.mainInterval < settings.minimalInterval ) {
  					settings.mainInterval = settings.minimalInterval;
  				}
  
  				// 'screenId' can be added from settings on the front end where the JS global
  				// 'pagenow' is not set.
  				if ( ! settings.screenId ) {
  					settings.screenId = options.screenId || 'front';
  				}
  
  				if ( 'disable' === options.suspension ) {
  					disableSuspend();
  				}
  			}
  
  			// Convert to milliseconds.
  			settings.mainInterval     = settings.mainInterval * 1000;
  			settings.originalInterval = settings.mainInterval;
  
  			/*
  			 * Switch the interval to 120 seconds by using the Page Visibility API.
  			 * If the browser doesn't support it (Safari < 7, Android < 4.4, IE < 10), the
  			 * interval will be increased to 120 seconds after 5 minutes of mouse and keyboard
  			 * inactivity.
  			 */
  			if ( typeof document.hidden !== 'undefined' ) {
  				hidden           = 'hidden';
  				visibilitychange = 'visibilitychange';
  				visibilityState  = 'visibilityState';
  			} else if ( typeof document.msHidden !== 'undefined' ) { // IE10
  				hidden           = 'msHidden';
  				visibilitychange = 'msvisibilitychange';
  				visibilityState  = 'msVisibilityState';
  			} else if ( typeof document.webkitHidden !== 'undefined' ) { // Android
  				hidden           = 'webkitHidden';
  				visibilitychange = 'webkitvisibilitychange';
  				visibilityState  = 'webkitVisibilityState';
  			}
  
  			if ( hidden ) {
  				if ( document[ hidden ] ) {
  					settings.hasFocus = false;
  				}
  
  				$document.on( visibilitychange + '.imagifybeat', function() {
  					if ( 'hidden' === document[ visibilityState ] ) {
  						blurred();
  						w.clearInterval( settings.checkFocusTimer );
  					} else {
  						focused();
  						if ( document.hasFocus ) {
  							settings.checkFocusTimer = w.setInterval( checkFocus, 10000 );
  						}
  					}
  				});
  			}
  
  			// Use document.hasFocus() if available.
  			if ( document.hasFocus ) {
  				settings.checkFocusTimer = w.setInterval( checkFocus, 10000 );
  			}
  
  			$( w ).on( 'unload.imagifybeat', function() {
  				// Don't connect anymore.
  				settings.suspend = true;
  
  				// Abort the last request if not completed.
  				if ( settings.xhr && 4 !== settings.xhr.readyState ) {
  					settings.xhr.abort();
  				}
  			} );
  
  			// Check for user activity every 30 seconds.
  			w.setInterval( checkUserActivity, 30000 );
  
  			// Start one tick after DOM ready.
  			$document.ready( function() {
  				settings.lastTick = time();
  				scheduleNextTick();
  			} );
  		}
  
  		/**
  		 * Returns the current time according to the browser.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {int} Returns the current time.
  		 */
  		function time() {
  			return (new Date()).getTime();
  		}
  
  		/**
  		 * Checks if the iframe is from the same origin.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {bool} Returns whether or not the iframe is from the same origin.
  		 */
  		function isLocalFrame( frame ) {
  			var origin, src = frame.src; // eslint-disable-line no-shadow
  
  			/*
  			 * Need to compare strings as WebKit doesn't throw JS errors when iframes have different origin. It throws uncatchable exceptions.
  			 */
  			if ( src && /^https?:\/\//.test( src ) ) {
  				origin = w.location.origin ? w.location.origin : w.location.protocol + '//' + w.location.host;
  
  				if ( src.indexOf( origin ) !== 0 ) {
  					return false;
  				}
  			}
  
  			try {
  				if ( frame.contentWindow.document ) {
  					return true;
  				}
  			} catch ( e ) {} // eslint-disable-line no-empty
  
  			return false;
  		}
  
  		/**
  		 * Checks if the document's focus has changed.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function checkFocus() {
  			if ( settings.hasFocus && ! document.hasFocus() ) {
  				blurred();
  			} else if ( ! settings.hasFocus && document.hasFocus() ) {
  				focused();
  			}
  		}
  
  		/**
  		 * Sets error state and fires an event on XHR errors or timeout.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @param  {string} error      The error type passed from the XHR.
  		 * @param  {int}    httpStatus The HTTP status code passed from jqXHR (200, 404, 500, etc.).
  		 * @return {void}
  		 */
  		function setErrorState( error, httpStatus ) {
  			var trigger;
  
  			if ( error ) {
  				switch ( error ) {
  					case 'abort':
  						// Do nothing.
  						break;
  					case 'timeout':
  						// No response for 30 sec.
  						trigger = true;
  						break;
  					case 'error':
  						if ( 503 === httpStatus && settings.hasConnected ) {
  							trigger = true;
  							break;
  						}
  						/* falls through */
  					case 'parsererror':
  					case 'empty':
  					case 'unknown':
  						settings.errorcount++;
  
  						if ( settings.errorcount > 2 && settings.hasConnected ) {
  							trigger = true;
  						}
  
  						break;
  				}
  
  				if ( trigger && ! hasConnectionError() ) {
  					settings.connectionError = true;
  					$document.trigger( 'imagifybeat-connection-lost', [ error, httpStatus ] );
  
  					if ( w.wp.hooks ) {
  						w.wp.hooks.doAction( 'imagifybeat.connection-lost', error, httpStatus );
  					}
  				}
  			}
  		}
  
  		/**
  		 * Clears the error state and fires an event if there is a connection error.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function clearErrorState() {
  			// Has connected successfully.
  			settings.hasConnected = true;
  
  			if ( hasConnectionError() ) {
  				settings.errorcount = 0;
  				settings.connectionError = false;
  				$document.trigger( 'imagifybeat-connection-restored' );
  
  				if ( w.wp.hooks ) {
  					w.wp.hooks.doAction( 'imagifybeat.connection-restored' );
  				}
  			}
  		}
  
  		/**
  		 * Gathers the data and connects to the server.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function connect() {
  			var ajaxData, imagifybeatData;
  
  			// If the connection to the server is slower than the interval,
  			// imagifybeat connects as soon as the previous connection's response is received.
  			if ( settings.connecting || settings.suspend ) {
  				return;
  			}
  
  			settings.lastTick = time();
  
  			imagifybeatData = $.extend( {}, settings.queue );
  			// Clear the data queue. Anything added after this point will be sent on the next tick.
  			settings.queue = {};
  
  			$document.trigger( 'imagifybeat-send', [ imagifybeatData ] );
  
  			if ( w.wp.hooks ) {
  				w.wp.hooks.doAction( 'imagifybeat.send', imagifybeatData );
  			}
  
  			ajaxData = {
  				data:      imagifybeatData,
  				interval:  settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000,
  				_nonce:    typeof w.imagifybeatSettings === 'object' ? w.imagifybeatSettings.nonce : '',
  				action:    'imagifybeat',
  				screen_id: settings.screenId,
  				has_focus: settings.hasFocus
  			};
  
  			if ( 'customize' === settings.screenId  ) {
  				ajaxData.wp_customize = 'on';
  			}
  
  			settings.connecting = true;
  			settings.xhr        = $.ajax( {
  				url:      settings.url,
  				type:     'post',
  				timeout:  60000, // Throw an error if not completed after 60 sec.
  				data:     ajaxData,
  				dataType: 'json'
  			} ).always( function() {
  				settings.connecting = false;
  				scheduleNextTick();
  			} ).done( function( response, textStatus, jqXHR ) {
  				var newInterval;
  
  				if ( ! response ) {
  					setErrorState( 'empty' );
  					return;
  				}
  
  				clearErrorState();
  
  				if ( response.nonces_expired ) {
  					$document.trigger( 'imagifybeat-nonces-expired' );
  
  					if ( w.wp.hooks ) {
  						w.wp.hooks.doAction( 'imagifybeat.nonces-expired' );
  					}
  				}
  
  				// Change the interval from PHP
  				if ( response.imagifybeat_interval ) {
  					newInterval = response.imagifybeat_interval;
  					delete response.imagifybeat_interval;
  				}
  
  				// Update the imagifybeat nonce if set.
  				if ( response.imagifybeat_nonce && typeof w.imagifybeatSettings === 'object' ) {
  					w.imagifybeatSettings.nonce = response.imagifybeat_nonce;
  					delete response.imagifybeat_nonce;
  				}
  
  				$document.trigger( 'imagifybeat-tick', [ response, textStatus, jqXHR ] );
  
  				if ( w.wp.hooks ) {
  					w.wp.hooks.doAction( 'imagifybeat.tick', response, textStatus, jqXHR );
  				}
  
  				// Do this last. Can trigger the next XHR if connection time > 5 sec. and newInterval == 'fast'.
  				if ( newInterval ) {
  					interval( newInterval );
  				}
  			} ).fail( function( jqXHR, textStatus, error ) {
  				setErrorState( textStatus || 'unknown', jqXHR.status );
  				$document.trigger( 'imagifybeat-error', [ jqXHR, textStatus, error ] );
  
  				if ( w.wp.hooks ) {
  					w.wp.hooks.doAction( 'imagifybeat.error', jqXHR, textStatus, error );
  				}
  			} );
  		}
  
  		/**
  		 * Schedules the next connection.
  		 *
  		 * Fires immediately if the connection time is longer than the interval.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function scheduleNextTick() {
  			var delta  = time() - settings.lastTick,
  				interv = settings.mainInterval;
  
  			if ( settings.suspend ) {
  				return;
  			}
  
  			if ( ! settings.hasFocus && settings.suspendEnabled ) {
  				// When no user activity or the window lost focus, increase polling interval to 120 seconds, but only if suspend is enabled.
  				interv = 120000; // 120 sec.
  			} else if ( settings.countdown > 0 && settings.tempInterval ) {
  				interv = settings.tempInterval;
  				settings.countdown--;
  
  				if ( settings.countdown < 1 ) {
  					settings.tempInterval = 0;
  				}
  			}
  
  			if ( settings.minimalInterval && interv < settings.minimalInterval ) {
  				interv = settings.minimalInterval;
  			}
  
  			w.clearTimeout( settings.beatTimer );
  
  			if ( delta < interv ) {
  				settings.beatTimer = w.setTimeout(
  					function() {
  						connect();
  					},
  					interv - delta
  				);
  			} else {
  				connect();
  			}
  		}
  
  		/**
  		 * Sets the internal state when the browser w becomes hidden or loses focus.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function blurred() {
  			settings.hasFocus = false;
  		}
  
  		/**
  		 * Sets the internal state when the browser w becomes visible or is in focus.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function focused() {
  			settings.userActivity = time();
  
  			// Resume if suspended
  			settings.suspend = false;
  
  			if ( ! settings.hasFocus ) {
  				settings.hasFocus = true;
  				scheduleNextTick();
  			}
  		}
  
  		/**
  		 * Runs when the user becomes active after a period of inactivity.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function userIsActive() {
  			settings.userActivityEvents = false;
  			$document.off( '.imagifybeat-active' );
  
  			$( 'iframe' ).each( function( i, frame ) {
  				if ( isLocalFrame( frame ) ) {
  					$( frame.contentWindow ).off( '.imagifybeat-active' );
  				}
  			} );
  
  			focused();
  		}
  
  		/**
  		 * Checks for user activity.
  		 *
  		 * Runs every 30 sec. Sets 'hasFocus = true' if user is active and the w is
  		 * in the background. Sets 'hasFocus = false' if the user has been inactive
  		 * (no mouse or keyboard activity) for 5 min. even when the w has focus.
  		 *
  		 * @since  1.9.3
  		 * @access private
  		 *
  		 * @return {void}
  		 */
  		function checkUserActivity() {
  			var lastActive = settings.userActivity ? time() - settings.userActivity : 0;
  
  			// Set hasFocus to false when no mouse or keyboard activity for 5 min.
  			if ( lastActive > 300000 && settings.hasFocus ) {
  				blurred();
  			}
  
  			// Suspend after 10 min. of inactivity.
  			if ( settings.suspendEnabled && lastActive > 600000 ) {
  				settings.suspend = true;
  			}
  
  			if ( ! settings.userActivityEvents ) {
  				$document.on( 'mouseover.imagifybeat-active keyup.imagifybeat-active touchend.imagifybeat-active', function() {
  					userIsActive();
  				} );
  
  				$( 'iframe' ).each( function( i, frame ) {
  					if ( isLocalFrame( frame ) ) {
  						$( frame.contentWindow ).on( 'mouseover.imagifybeat-active keyup.imagifybeat-active touchend.imagifybeat-active', function() {
  							userIsActive();
  						} );
  					}
  				} );
  
  				settings.userActivityEvents = true;
  			}
  		}
  
  		// Public methods.
  
  		/**
  		 * Checks whether the w (or any local iframe in it) has focus, or the user
  		 * is active.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @return {bool} True if the w or the user is active.
  		 */
  		function hasFocus() {
  			return settings.hasFocus;
  		}
  
  		/**
  		 * Checks whether there is a connection error.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @return {bool} True if a connection error was found.
  		 */
  		function hasConnectionError() {
  			return settings.connectionError;
  		}
  
  		/**
  		 * Connects as soon as possible regardless of 'hasFocus' state.
  		 *
  		 * Will not open two concurrent connections. If a connection is in progress,
  		 * will connect again immediately after the current connection completes.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @return {void}
  		 */
  		function connectNow() {
  			settings.lastTick = 0;
  			scheduleNextTick();
  		}
  
  		/**
  		 * Disables suspending.
  		 *
  		 * Should be used only when Imagifybeat is performing critical tasks like
  		 * autosave, post-locking, etc. Using this on many screens may overload the
  		 * user's hosting account if several browser ws/tabs are left open for a
  		 * long time.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @return {void}
  		 */
  		function disableSuspend() {
  			settings.suspendEnabled = false;
  		}
  
  		/**
  		 * Enables suspending.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @return {void}
  		 */
  		function enableSuspend() {
  			settings.suspendEnabled = true;
  		}
  
  		/**
  		 * Gets/Sets the interval.
  		 *
  		 * When setting to 'fast' or 5, the interval is 5 seconds for the next 30 ticks
  		 * (for 2 minutes and 30 seconds) by default. In this case the number of 'ticks'
  		 * can be passed as second argument. If the window doesn't have focus, the
  		 * interval slows down to 2 min.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @param  {string|int} speed Interval: 'fast' or 5, 15, 30, 60, 120. Fast equals 5.
  		 * @param  {string}     ticks Tells how many ticks before the interval reverts back. Used with speed = 'fast' or 5.
  		 * @return {int}              Current interval in seconds.
  		 */
  		function interval( speed, ticks ) {
  			var newInterval,
  				oldInterval = settings.tempInterval ? settings.tempInterval : settings.mainInterval;
  
  			if ( speed ) {
  				switch ( speed ) {
  					case 'fast':
  					case 5:
  						newInterval = 5000;
  						break;
  					case 15:
  						newInterval = 15000;
  						break;
  					case 30:
  						newInterval = 30000;
  						break;
  					case 60:
  						newInterval = 60000;
  						break;
  					case 120:
  						newInterval = 120000;
  						break;
  					case 'long-polling':
  						// Allow long polling, (experimental)
  						settings.mainInterval = 0;
  						return 0;
  					default:
  						newInterval = settings.originalInterval;
  				}
  
  				if ( settings.minimalInterval && newInterval < settings.minimalInterval ) {
  					newInterval = settings.minimalInterval;
  				}
  
  				if ( 5000 === newInterval ) {
  					ticks = parseInt( ticks, 10 ) || 30;
  					ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
  
  					settings.countdown    = ticks;
  					settings.tempInterval = newInterval;
  				} else {
  					settings.countdown    = 0;
  					settings.tempInterval = 0;
  					settings.mainInterval = newInterval;
  				}
  
  				// Change the next connection time if new interval has been set.
  				// Will connect immediately if the time since the last connection
  				// is greater than the new interval.
  				if ( newInterval !== oldInterval ) {
  					scheduleNextTick();
  				}
  			}
  
  			return settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000;
  		}
  
  		/**
  		 * Resets the interval.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @return {int} Current interval in seconds.
  		 */
  		function resetInterval() {
  			return interval( settings.originalInterval );
  		}
  
  		/**
  		 * Enqueues data to send with the next XHR.
  		 *
  		 * As the data is send asynchronously, this function doesn't return the XHR
  		 * response. To see the response, use the custom jQuery event 'imagifybeat-tick'
  		 * on the document, example:
  		 *      $(document).on( 'imagifybeat-tick.myname', function( event, data, textStatus, jqXHR ) {
  		 *          // code
  		 *      });
  		 * If the same 'handle' is used more than once, the data is not overwritten when
  		 * the third argument is 'true'. Use `imagify.beat.isQueued('handle')` to see if
  		 * any data is already queued for that handle.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @param  {string} handle      Unique handle for the data, used in PHP to receive the data.
  		 * @param  {mixed}  data        The data to send.
  		 * @param  {bool}   noOverwrite Whether to overwrite existing data in the queue.
  		 * @return {bool}               True if the data was queued.
  		 */
  		function enqueue( handle, data, noOverwrite ) {
  			if ( handle ) {
  				if ( noOverwrite && this.isQueued( handle ) ) {
  					return false;
  				}
  
  				settings.queue[handle] = data;
  				return true;
  			}
  			return false;
  		}
  
  		/**
  		 * Checks if data with a particular handle is queued.
  		 *
  		 * @since 1.9.3
  		 *
  		 * @param  {string} handle The handle for the data.
  		 * @return {bool}          True if the data is queued with this handle.
  		 */
  		function isQueued( handle ) {
  			if ( handle ) {
  				return settings.queue.hasOwnProperty( handle );
  			}
  		}
  
  		/**
  		 * Removes data with a particular handle from the queue.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @param {string} handle The handle for the data.
  		 */
  		function dequeue( handle ) {
  			if ( handle ) {
  				delete settings.queue[handle];
  			}
  		}
  
  		/**
  		 * Gets data that was enqueued with a particular handle.
  		 *
  		 * @since    1.9.3
  		 * @memberOf imagify.beat.prototype
  		 *
  		 * @param  {string} handle The handle for the data.
  		 * @return {mixed}         The data or undefined.
  		 */
  		function getQueuedItem( handle ) {
  			if ( handle ) {
  				return this.isQueued( handle ) ? settings.queue[ handle ] : undefined;
  			}
  		}
  
  		initialize();
  
  		// Expose public methods.
  		return {
  			hasFocus:           hasFocus,
  			connectNow:         connectNow,
  			disableSuspend:     disableSuspend,
  			enableSuspend:      enableSuspend,
  			interval:           interval,
  			resetInterval:      resetInterval,
  			hasConnectionError: hasConnectionError,
  			enqueue:            enqueue,
  			dequeue:            dequeue,
  			isQueued:           isQueued,
  			getQueuedItem:      getQueuedItem
  		};
  	};
  
  	/**
  	 * Contains the Imagifybeat API.
  	 *
  	 * @namespace imagify.beat
  	 * @type      {Imagifybeat}
  	 */
  	w.imagify.beat = new Imagifybeat();
  
  } )( jQuery, document, window );
  