create-expo-cljs-app/template/.shadow-cljs/builds/app/dev/goog-js/goog.events.events.js

Create a react native application with Expo and Shadow-CLJS!

["^ ","~:resource-id",["~:shadow.build.classpath/resource","goog/events/events.js"],"~:js","goog.provide(\"goog.events\");\ngoog.provide(\"goog.events.CaptureSimulationMode\");\ngoog.provide(\"goog.events.Key\");\ngoog.provide(\"goog.events.ListenableType\");\ngoog.forwardDeclare(\"goog.debug.ErrorHandler\");\ngoog.forwardDeclare(\"goog.events.EventWrapper\");\ngoog.require(\"goog.asserts\");\ngoog.require(\"goog.debug.entryPointRegistry\");\ngoog.require(\"goog.events.BrowserEvent\");\ngoog.require(\"goog.events.BrowserFeature\");\ngoog.require(\"goog.events.Listenable\");\ngoog.require(\"goog.events.ListenerMap\");\ngoog.events.Key;\ngoog.events.ListenableType;\ngoog.events.LISTENER_MAP_PROP_ = \"closure_lm_\" + (Math.random() * 1e6 | 0);\ngoog.events.onString_ = \"on\";\ngoog.events.onStringMap_ = {};\ngoog.events.CaptureSimulationMode = {OFF_AND_FAIL:0, OFF_AND_SILENT:1, ON:2};\ngoog.events.CAPTURE_SIMULATION_MODE = goog.define(\"goog.events.CAPTURE_SIMULATION_MODE\", 2);\ngoog.events.listenerCountEstimate_ = 0;\ngoog.events.listen = function(src, type, listener, opt_options, opt_handler) {\n  if (opt_options && opt_options.once) {\n    return goog.events.listenOnce(src, type, listener, opt_options, opt_handler);\n  }\n  if (goog.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.listen(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    var capture = goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    return src.listen(type, listener, capture, opt_handler);\n  } else {\n    return goog.events.listen_(src, type, listener, false, opt_options, opt_handler);\n  }\n};\ngoog.events.listen_ = function(src, type, listener, callOnce, opt_options, opt_handler) {\n  if (!type) {\n    throw new Error(\"Invalid event type\");\n  }\n  var capture = goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n  if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\n    if (goog.events.CAPTURE_SIMULATION_MODE == goog.events.CaptureSimulationMode.OFF_AND_FAIL) {\n      goog.asserts.fail(\"Can not register capture listener in IE8-.\");\n      return null;\n    } else {\n      if (goog.events.CAPTURE_SIMULATION_MODE == goog.events.CaptureSimulationMode.OFF_AND_SILENT) {\n        return null;\n      }\n    }\n  }\n  var listenerMap = goog.events.getListenerMap_(src);\n  if (!listenerMap) {\n    src[goog.events.LISTENER_MAP_PROP_] = listenerMap = new goog.events.ListenerMap(src);\n  }\n  var listenerObj = listenerMap.add(type, listener, callOnce, capture, opt_handler);\n  if (listenerObj.proxy) {\n    return listenerObj;\n  }\n  var proxy = goog.events.getProxy();\n  listenerObj.proxy = proxy;\n  proxy.src = src;\n  proxy.listener = listenerObj;\n  if (src.addEventListener) {\n    if (!goog.events.BrowserFeature.PASSIVE_EVENTS) {\n      opt_options = capture;\n    }\n    if (opt_options === undefined) {\n      opt_options = false;\n    }\n    src.addEventListener(type.toString(), proxy, opt_options);\n  } else {\n    if (src.attachEvent) {\n      src.attachEvent(goog.events.getOnString_(type.toString()), proxy);\n    } else {\n      if (src.addListener && src.removeListener) {\n        goog.asserts.assert(type === \"change\", \"MediaQueryList only has a change event\");\n        src.addListener(proxy);\n      } else {\n        throw new Error(\"addEventListener and attachEvent are unavailable.\");\n      }\n    }\n  }\n  goog.events.listenerCountEstimate_++;\n  return listenerObj;\n};\ngoog.events.getProxy = function() {\n  var proxyCallbackFunction = goog.events.handleBrowserEvent_;\n  var f = goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ? function(eventObject) {\n    return proxyCallbackFunction.call(f.src, f.listener, eventObject);\n  } : function(eventObject) {\n    var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);\n    if (!v) {\n      return v;\n    }\n  };\n  return f;\n};\ngoog.events.listenOnce = function(src, type, listener, opt_options, opt_handler) {\n  if (goog.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.listenOnce(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    var capture = goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    return src.listenOnce(type, listener, capture, opt_handler);\n  } else {\n    return goog.events.listen_(src, type, listener, true, opt_options, opt_handler);\n  }\n};\ngoog.events.listenWithWrapper = function(src, wrapper, listener, opt_capt, opt_handler) {\n  wrapper.listen(src, listener, opt_capt, opt_handler);\n};\ngoog.events.unlisten = function(src, type, listener, opt_options, opt_handler) {\n  if (goog.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.unlisten(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n  var capture = goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.unlisten(type, listener, capture, opt_handler);\n  }\n  if (!src) {\n    return false;\n  }\n  var listenerMap = goog.events.getListenerMap_(src);\n  if (listenerMap) {\n    var listenerObj = listenerMap.getListener(type, listener, capture, opt_handler);\n    if (listenerObj) {\n      return goog.events.unlistenByKey(listenerObj);\n    }\n  }\n  return false;\n};\ngoog.events.unlistenByKey = function(key) {\n  if (typeof key === \"number\") {\n    return false;\n  }\n  var listener = key;\n  if (!listener || listener.removed) {\n    return false;\n  }\n  var src = listener.src;\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.unlistenByKey(listener);\n  }\n  var type = listener.type;\n  var proxy = listener.proxy;\n  if (src.removeEventListener) {\n    src.removeEventListener(type, proxy, listener.capture);\n  } else {\n    if (src.detachEvent) {\n      src.detachEvent(goog.events.getOnString_(type), proxy);\n    } else {\n      if (src.addListener && src.removeListener) {\n        src.removeListener(proxy);\n      }\n    }\n  }\n  goog.events.listenerCountEstimate_--;\n  var listenerMap = goog.events.getListenerMap_(src);\n  if (listenerMap) {\n    listenerMap.removeByKey(listener);\n    if (listenerMap.getTypeCount() == 0) {\n      listenerMap.src = null;\n      src[goog.events.LISTENER_MAP_PROP_] = null;\n    }\n  } else {\n    listener.markAsRemoved();\n  }\n  return true;\n};\ngoog.events.unlistenWithWrapper = function(src, wrapper, listener, opt_capt, opt_handler) {\n  wrapper.unlisten(src, listener, opt_capt, opt_handler);\n};\ngoog.events.removeAll = function(obj, opt_type) {\n  if (!obj) {\n    return 0;\n  }\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return obj.removeAllListeners(opt_type);\n  }\n  var listenerMap = goog.events.getListenerMap_(obj);\n  if (!listenerMap) {\n    return 0;\n  }\n  var count = 0;\n  var typeStr = opt_type && opt_type.toString();\n  for (var type in listenerMap.listeners) {\n    if (!typeStr || type == typeStr) {\n      var listeners = listenerMap.listeners[type].concat();\n      for (var i = 0; i < listeners.length; ++i) {\n        if (goog.events.unlistenByKey(listeners[i])) {\n          ++count;\n        }\n      }\n    }\n  }\n  return count;\n};\ngoog.events.getListeners = function(obj, type, capture) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return obj.getListeners(type, capture);\n  } else {\n    if (!obj) {\n      return [];\n    }\n    var listenerMap = goog.events.getListenerMap_(obj);\n    return listenerMap ? listenerMap.getListeners(type, capture) : [];\n  }\n};\ngoog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {\n  type = type;\n  listener = goog.events.wrapListener(listener);\n  var capture = !!opt_capt;\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.getListener(type, listener, capture, opt_handler);\n  }\n  if (!src) {\n    return null;\n  }\n  var listenerMap = goog.events.getListenerMap_(src);\n  if (listenerMap) {\n    return listenerMap.getListener(type, listener, capture, opt_handler);\n  }\n  return null;\n};\ngoog.events.hasListener = function(obj, opt_type, opt_capture) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return obj.hasListener(opt_type, opt_capture);\n  }\n  var listenerMap = goog.events.getListenerMap_(obj);\n  return !!listenerMap && listenerMap.hasListener(opt_type, opt_capture);\n};\ngoog.events.expose = function(e) {\n  var str = [];\n  for (var key in e) {\n    if (e[key] && e[key].id) {\n      str.push(key + \" \\x3d \" + e[key] + \" (\" + e[key].id + \")\");\n    } else {\n      str.push(key + \" \\x3d \" + e[key]);\n    }\n  }\n  return str.join(\"\\n\");\n};\ngoog.events.getOnString_ = function(type) {\n  if (type in goog.events.onStringMap_) {\n    return goog.events.onStringMap_[type];\n  }\n  return goog.events.onStringMap_[type] = goog.events.onString_ + type;\n};\ngoog.events.fireListeners = function(obj, type, capture, eventObject) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return obj.fireListeners(type, capture, eventObject);\n  }\n  return goog.events.fireListeners_(obj, type, capture, eventObject);\n};\ngoog.events.fireListeners_ = function(obj, type, capture, eventObject) {\n  var retval = true;\n  var listenerMap = goog.events.getListenerMap_(obj);\n  if (listenerMap) {\n    var listenerArray = listenerMap.listeners[type.toString()];\n    if (listenerArray) {\n      listenerArray = listenerArray.concat();\n      for (var i = 0; i < listenerArray.length; i++) {\n        var listener = listenerArray[i];\n        if (listener && listener.capture == capture && !listener.removed) {\n          var result = goog.events.fireListener(listener, eventObject);\n          retval = retval && result !== false;\n        }\n      }\n    }\n  }\n  return retval;\n};\ngoog.events.fireListener = function(listener, eventObject) {\n  var listenerFn = listener.listener;\n  var listenerHandler = listener.handler || listener.src;\n  if (listener.callOnce) {\n    goog.events.unlistenByKey(listener);\n  }\n  return listenerFn.call(listenerHandler, eventObject);\n};\ngoog.events.getTotalListenerCount = function() {\n  return goog.events.listenerCountEstimate_;\n};\ngoog.events.dispatchEvent = function(src, e) {\n  goog.asserts.assert(goog.events.Listenable.isImplementedBy(src), \"Can not use goog.events.dispatchEvent with \" + \"non-goog.events.Listenable instance.\");\n  return src.dispatchEvent(e);\n};\ngoog.events.protectBrowserEventEntryPoint = function(errorHandler) {\n  goog.events.handleBrowserEvent_ = errorHandler.protectEntryPoint(goog.events.handleBrowserEvent_);\n};\ngoog.events.handleBrowserEvent_ = function(listener, opt_evt) {\n  if (listener.removed) {\n    return true;\n  }\n  if (!goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\n    var ieEvent = opt_evt || goog.getObjectByName(\"window.event\");\n    var evt = new goog.events.BrowserEvent(ieEvent, this);\n    var retval = true;\n    if (goog.events.CAPTURE_SIMULATION_MODE == goog.events.CaptureSimulationMode.ON) {\n      if (!goog.events.isMarkedIeEvent_(ieEvent)) {\n        goog.events.markIeEvent_(ieEvent);\n        var ancestors = [];\n        for (var parent = evt.currentTarget; parent; parent = parent.parentNode) {\n          ancestors.push(parent);\n        }\n        var type = listener.type;\n        for (var i = ancestors.length - 1; !evt.propagationStopped_ && i >= 0; i--) {\n          evt.currentTarget = ancestors[i];\n          var result = goog.events.fireListeners_(ancestors[i], type, true, evt);\n          retval = retval && result;\n        }\n        for (var i = 0; !evt.propagationStopped_ && i < ancestors.length; i++) {\n          evt.currentTarget = ancestors[i];\n          var result = goog.events.fireListeners_(ancestors[i], type, false, evt);\n          retval = retval && result;\n        }\n      }\n    } else {\n      retval = goog.events.fireListener(listener, evt);\n    }\n    return retval;\n  }\n  return goog.events.fireListener(listener, new goog.events.BrowserEvent(opt_evt, this));\n};\ngoog.events.markIeEvent_ = function(e) {\n  var useReturnValue = false;\n  if (e.keyCode == 0) {\n    try {\n      e.keyCode = -1;\n      return;\n    } catch (ex) {\n      useReturnValue = true;\n    }\n  }\n  if (useReturnValue || e.returnValue == undefined) {\n    e.returnValue = true;\n  }\n};\ngoog.events.isMarkedIeEvent_ = function(e) {\n  return e.keyCode < 0 || e.returnValue != undefined;\n};\ngoog.events.uniqueIdCounter_ = 0;\ngoog.events.getUniqueId = function(identifier) {\n  return identifier + \"_\" + goog.events.uniqueIdCounter_++;\n};\ngoog.events.getListenerMap_ = function(src) {\n  var listenerMap = src[goog.events.LISTENER_MAP_PROP_];\n  return listenerMap instanceof goog.events.ListenerMap ? listenerMap : null;\n};\ngoog.events.LISTENER_WRAPPER_PROP_ = \"__closure_events_fn_\" + (Math.random() * 1e9 >>> 0);\ngoog.events.wrapListener = function(listener) {\n  goog.asserts.assert(listener, \"Listener can not be null.\");\n  if (goog.isFunction(listener)) {\n    return listener;\n  }\n  goog.asserts.assert(listener.handleEvent, \"An object listener must have handleEvent method.\");\n  if (!listener[goog.events.LISTENER_WRAPPER_PROP_]) {\n    listener[goog.events.LISTENER_WRAPPER_PROP_] = function(e) {\n      return listener.handleEvent(e);\n    };\n  }\n  return listener[goog.events.LISTENER_WRAPPER_PROP_];\n};\ngoog.debug.entryPointRegistry.register(function(transformer) {\n  goog.events.handleBrowserEvent_ = transformer(goog.events.handleBrowserEvent_);\n});\n","~:source","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\n//\n// Licensed under the Apache License, Version 2.0 (the \"License\");\n// you may not use this file except in compliance with the License.\n// You may obtain a copy of the License at\n//\n//      http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing, software\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n// See the License for the specific language governing permissions and\n// limitations under the License.\n\n/**\n * @fileoverview An event manager for both native browser event\n * targets and custom JavaScript event targets\n * (`goog.events.Listenable`). This provides an abstraction\n * over browsers' event systems.\n *\n * It also provides a simulation of W3C event model's capture phase in\n * Internet Explorer (IE 8 and below). Caveat: the simulation does not\n * interact well with listeners registered directly on the elements\n * (bypassing goog.events) or even with listeners registered via\n * goog.events in a separate JS binary. In these cases, we provide\n * no ordering guarantees.\n *\n * The listeners will receive a \"patched\" event object. Such event object\n * contains normalized values for certain event properties that differs in\n * different browsers.\n *\n * Example usage:\n * <pre>\n * goog.events.listen(myNode, 'click', function(e) { alert('woo') });\n * goog.events.listen(myNode, 'mouseover', mouseHandler, true);\n * goog.events.unlisten(myNode, 'mouseover', mouseHandler, true);\n * goog.events.removeAll(myNode);\n * </pre>\n *\n *                                            in IE and event object patching]\n * @author arv@google.com (Erik Arvidsson)\n *\n * @see ../demos/events.html\n * @see ../demos/event-propagation.html\n * @see ../demos/stopevent.html\n */\n\n// IMPLEMENTATION NOTES:\n// goog.events stores an auxiliary data structure on each EventTarget\n// source being listened on. This allows us to take advantage of GC,\n// having the data structure GC'd when the EventTarget is GC'd. This\n// GC behavior is equivalent to using W3C DOM Events directly.\n\ngoog.provide('goog.events');\ngoog.provide('goog.events.CaptureSimulationMode');\ngoog.provide('goog.events.Key');\ngoog.provide('goog.events.ListenableType');\n\ngoog.forwardDeclare('goog.debug.ErrorHandler');\ngoog.forwardDeclare('goog.events.EventWrapper');\ngoog.require('goog.asserts');\ngoog.require('goog.debug.entryPointRegistry');\ngoog.require('goog.events.BrowserEvent');\ngoog.require('goog.events.BrowserFeature');\ngoog.require('goog.events.Listenable');\ngoog.require('goog.events.ListenerMap');\n\n\n/**\n * @typedef {number|goog.events.ListenableKey}\n */\ngoog.events.Key;\n\n\n/**\n * @typedef {EventTarget|goog.events.Listenable}\n */\ngoog.events.ListenableType;\n\n\n/**\n * Property name on a native event target for the listener map\n * associated with the event target.\n * @private @const {string}\n */\ngoog.events.LISTENER_MAP_PROP_ = 'closure_lm_' + ((Math.random() * 1e6) | 0);\n\n\n/**\n * String used to prepend to IE event types.\n * @const\n * @private\n */\ngoog.events.onString_ = 'on';\n\n\n/**\n * Map of computed \"on<eventname>\" strings for IE event types. Caching\n * this removes an extra object allocation in goog.events.listen which\n * improves IE6 performance.\n * @const\n * @dict\n * @private\n */\ngoog.events.onStringMap_ = {};\n\n\n/**\n * @enum {number} Different capture simulation mode for IE8-.\n */\ngoog.events.CaptureSimulationMode = {\n  /**\n   * Does not perform capture simulation. Will asserts in IE8- when you\n   * add capture listeners.\n   */\n  OFF_AND_FAIL: 0,\n\n  /**\n   * Does not perform capture simulation, silently ignore capture\n   * listeners.\n   */\n  OFF_AND_SILENT: 1,\n\n  /**\n   * Performs capture simulation.\n   */\n  ON: 2\n};\n\n\n/**\n * @define {number} The capture simulation mode for IE8-. By default,\n *     this is ON.\n */\ngoog.events.CAPTURE_SIMULATION_MODE =\n    goog.define('goog.events.CAPTURE_SIMULATION_MODE', 2);\n\n\n/**\n * Estimated count of total native listeners.\n * @private {number}\n */\ngoog.events.listenerCountEstimate_ = 0;\n\n\n/**\n * Adds an event listener for a specific event on a native event\n * target (such as a DOM element) or an object that has implemented\n * {@link goog.events.Listenable}. A listener can only be added once\n * to an object and if it is added again the key for the listener is\n * returned. Note that if the existing listener is a one-off listener\n * (registered via listenOnce), it will no longer be a one-off\n * listener after a call to listen().\n *\n * @param {EventTarget|goog.events.Listenable} src The node to listen\n *     to events on.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types.\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}\n *     listener Callback method, or an object with a handleEvent function.\n *     WARNING: passing an Object is now softly deprecated.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {T=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.Key} Unique key for the listener.\n * @template T,EVENTOBJ\n */\ngoog.events.listen = function(src, type, listener, opt_options, opt_handler) {\n  if (opt_options && opt_options.once) {\n    return goog.events.listenOnce(\n        src, type, listener, opt_options, opt_handler);\n  }\n  if (goog.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.listen(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    var capture =\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    return src.listen(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n  } else {\n    return goog.events.listen_(\n        /** @type {!EventTarget} */ (src), type, listener,\n        /* callOnce */ false, opt_options, opt_handler);\n  }\n};\n\n\n/**\n * Adds an event listener for a specific event on a native event\n * target. A listener can only be added once to an object and if it\n * is added again the key for the listener is returned.\n *\n * Note that a one-off listener will not change an existing listener,\n * if any. On the other hand a normal listener will change existing\n * one-off listener to become a normal listener.\n *\n * @param {EventTarget} src The node to listen to events on.\n * @param {string|?goog.events.EventId<EVENTOBJ>} type Event type.\n * @param {!Function} listener Callback function.\n * @param {boolean} callOnce Whether the listener is a one-off\n *     listener or otherwise.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.ListenableKey} Unique key for the listener.\n * @template EVENTOBJ\n * @private\n */\ngoog.events.listen_ = function(\n    src, type, listener, callOnce, opt_options, opt_handler) {\n  if (!type) {\n    throw new Error('Invalid event type');\n  }\n\n  var capture =\n      goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n  if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\n    if (goog.events.CAPTURE_SIMULATION_MODE ==\n        goog.events.CaptureSimulationMode.OFF_AND_FAIL) {\n      goog.asserts.fail('Can not register capture listener in IE8-.');\n      return null;\n    } else if (\n        goog.events.CAPTURE_SIMULATION_MODE ==\n        goog.events.CaptureSimulationMode.OFF_AND_SILENT) {\n      return null;\n    }\n  }\n\n  var listenerMap = goog.events.getListenerMap_(src);\n  if (!listenerMap) {\n    src[goog.events.LISTENER_MAP_PROP_] = listenerMap =\n        new goog.events.ListenerMap(src);\n  }\n\n  var listenerObj = /** @type {goog.events.Listener} */ (\n      listenerMap.add(type, listener, callOnce, capture, opt_handler));\n\n  // If the listenerObj already has a proxy, it has been set up\n  // previously. We simply return.\n  if (listenerObj.proxy) {\n    return listenerObj;\n  }\n\n  var proxy = goog.events.getProxy();\n  listenerObj.proxy = proxy;\n\n  proxy.src = src;\n  proxy.listener = listenerObj;\n\n  // Attach the proxy through the browser's API\n  if (src.addEventListener) {\n    // Don't pass an object as `capture` if the browser doesn't support that.\n    if (!goog.events.BrowserFeature.PASSIVE_EVENTS) {\n      opt_options = capture;\n    }\n    // Don't break tests that expect a boolean.\n    if (opt_options === undefined) opt_options = false;\n    src.addEventListener(type.toString(), proxy, opt_options);\n  } else if (src.attachEvent) {\n    // The else if above used to be an unconditional else. It would call\n    // exception on IE11, spoiling the day of some callers. The previous\n    // incarnation of this code, from 2007, indicates that it replaced an\n    // earlier still version that caused excess allocations on IE6.\n    src.attachEvent(goog.events.getOnString_(type.toString()), proxy);\n  } else if (src.addListener && src.removeListener) {\n    // In IE, MediaQueryList uses addListener() insteadd of addEventListener. In\n    // Safari, there is no global for the MediaQueryList constructor, so we just\n    // check whether the object \"looks like\" MediaQueryList.\n    goog.asserts.assert(\n        type === 'change', 'MediaQueryList only has a change event');\n    src.addListener(proxy);\n  } else {\n    throw new Error('addEventListener and attachEvent are unavailable.');\n  }\n\n  goog.events.listenerCountEstimate_++;\n  return listenerObj;\n};\n\n\n/**\n * Helper function for returning a proxy function.\n * @return {!Function} A new or reused function object.\n */\ngoog.events.getProxy = function() {\n  var proxyCallbackFunction = goog.events.handleBrowserEvent_;\n  // Use a local var f to prevent one allocation.\n  var f =\n      goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ? function(eventObject) {\n        return proxyCallbackFunction.call(f.src, f.listener, eventObject);\n      } : function(eventObject) {\n        var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);\n        // NOTE(chrishenry): In IE, we hack in a capture phase. However, if\n        // there is inline event handler which tries to prevent default (for\n        // example <a href=\"...\" onclick=\"return false\">...</a>) in a\n        // descendant element, the prevent default will be overridden\n        // by this listener if this listener were to return true. Hence, we\n        // return undefined.\n        if (!v) return v;\n      };\n  return f;\n};\n\n\n/**\n * Adds an event listener for a specific event on a native event\n * target (such as a DOM element) or an object that has implemented\n * {@link goog.events.Listenable}. After the event has fired the event\n * listener is removed from the target.\n *\n * If an existing listener already exists, listenOnce will do\n * nothing. In particular, if the listener was previously registered\n * via listen(), listenOnce() will not turn the listener into a\n * one-off listener. Similarly, if there is already an existing\n * one-off listener, listenOnce does not modify the listeners (it is\n * still a once listener).\n *\n * @param {EventTarget|goog.events.Listenable} src The node to listen\n *     to events on.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types.\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}\n *     listener Callback method.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {T=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.Key} Unique key for the listener.\n * @template T,EVENTOBJ\n */\ngoog.events.listenOnce = function(\n    src, type, listener, opt_options, opt_handler) {\n  if (goog.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.listenOnce(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    var capture =\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    return src.listenOnce(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n  } else {\n    return goog.events.listen_(\n        /** @type {!EventTarget} */ (src), type, listener,\n        /* callOnce */ true, opt_options, opt_handler);\n  }\n};\n\n\n/**\n * Adds an event listener with a specific event wrapper on a DOM Node or an\n * object that has implemented {@link goog.events.Listenable}. A listener can\n * only be added once to an object.\n *\n * @param {EventTarget|goog.events.Listenable} src The target to\n *     listen to events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(this:T, ?):?|{handleEvent:function(?):?}|null} listener\n *     Callback method, or an object with a handleEvent function.\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\n *     false).\n * @param {T=} opt_handler Element in whose scope to call the listener.\n * @template T\n */\ngoog.events.listenWithWrapper = function(\n    src, wrapper, listener, opt_capt, opt_handler) {\n  wrapper.listen(src, listener, opt_capt, opt_handler);\n};\n\n\n/**\n * Removes an event listener which was added with listen().\n *\n * @param {EventTarget|goog.events.Listenable} src The target to stop\n *     listening to events on.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types to unlisten to.\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to remove.\n * @param {(boolean|!EventListenerOptions)=} opt_options\n *     whether the listener is fired during the capture or bubble phase of the\n *     event.\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n * @return {?boolean} indicating whether the listener was there to remove.\n * @template EVENTOBJ\n */\ngoog.events.unlisten = function(src, type, listener, opt_options, opt_handler) {\n  if (goog.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.unlisten(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n  var capture =\n      goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.unlisten(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n  }\n\n  if (!src) {\n    // TODO(chrishenry): We should tighten the API to only accept\n    // non-null objects, or add an assertion here.\n    return false;\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (src));\n  if (listenerMap) {\n    var listenerObj = listenerMap.getListener(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n    if (listenerObj) {\n      return goog.events.unlistenByKey(listenerObj);\n    }\n  }\n\n  return false;\n};\n\n\n/**\n * Removes an event listener which was added with listen() by the key\n * returned by listen().\n *\n * @param {goog.events.Key} key The key returned by listen() for this\n *     event listener.\n * @return {boolean} indicating whether the listener was there to remove.\n */\ngoog.events.unlistenByKey = function(key) {\n  // TODO(chrishenry): Remove this check when tests that rely on this\n  // are fixed.\n  if (typeof key === 'number') {\n    return false;\n  }\n\n  var listener = key;\n  if (!listener || listener.removed) {\n    return false;\n  }\n\n  var src = listener.src;\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return /** @type {!goog.events.Listenable} */ (src).unlistenByKey(listener);\n  }\n\n  var type = listener.type;\n  var proxy = listener.proxy;\n  if (src.removeEventListener) {\n    src.removeEventListener(type, proxy, listener.capture);\n  } else if (src.detachEvent) {\n    src.detachEvent(goog.events.getOnString_(type), proxy);\n  } else if (src.addListener && src.removeListener) {\n    src.removeListener(proxy);\n  }\n  goog.events.listenerCountEstimate_--;\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (src));\n  // TODO(chrishenry): Try to remove this conditional and execute the\n  // first branch always. This should be safe.\n  if (listenerMap) {\n    listenerMap.removeByKey(listener);\n    if (listenerMap.getTypeCount() == 0) {\n      // Null the src, just because this is simple to do (and useful\n      // for IE <= 7).\n      listenerMap.src = null;\n      // We don't use delete here because IE does not allow delete\n      // on a window object.\n      src[goog.events.LISTENER_MAP_PROP_] = null;\n    }\n  } else {\n    /** @type {!goog.events.Listener} */ (listener).markAsRemoved();\n  }\n\n  return true;\n};\n\n\n/**\n * Removes an event listener which was added with listenWithWrapper().\n *\n * @param {EventTarget|goog.events.Listenable} src The target to stop\n *     listening to events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to remove.\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\n *     whether the listener is fired during the capture or bubble phase of the\n *     event.\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n */\ngoog.events.unlistenWithWrapper = function(\n    src, wrapper, listener, opt_capt, opt_handler) {\n  wrapper.unlisten(src, listener, opt_capt, opt_handler);\n};\n\n\n/**\n * Removes all listeners from an object. You can also optionally\n * remove listeners of a particular type.\n *\n * @param {Object|undefined} obj Object to remove listeners from. Must be an\n *     EventTarget or a goog.events.Listenable.\n * @param {string|!goog.events.EventId=} opt_type Type of event to remove.\n *     Default is all types.\n * @return {number} Number of listeners removed.\n */\ngoog.events.removeAll = function(obj, opt_type) {\n  // TODO(chrishenry): Change the type of obj to\n  // (!EventTarget|!goog.events.Listenable).\n\n  if (!obj) {\n    return 0;\n  }\n\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return /** @type {?} */ (obj).removeAllListeners(opt_type);\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (obj));\n  if (!listenerMap) {\n    return 0;\n  }\n\n  var count = 0;\n  var typeStr = opt_type && opt_type.toString();\n  for (var type in listenerMap.listeners) {\n    if (!typeStr || type == typeStr) {\n      // Clone so that we don't need to worry about unlistenByKey\n      // changing the content of the ListenerMap.\n      var listeners = listenerMap.listeners[type].concat();\n      for (var i = 0; i < listeners.length; ++i) {\n        if (goog.events.unlistenByKey(listeners[i])) {\n          ++count;\n        }\n      }\n    }\n  }\n  return count;\n};\n\n\n/**\n * Gets the listeners for a given object, type and capture phase.\n *\n * @param {Object} obj Object to get listeners for.\n * @param {string|!goog.events.EventId} type Event type.\n * @param {boolean} capture Capture phase?.\n * @return {Array<!goog.events.Listener>} Array of listener objects.\n */\ngoog.events.getListeners = function(obj, type, capture) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return /** @type {!goog.events.Listenable} */ (obj).getListeners(\n        type, capture);\n  } else {\n    if (!obj) {\n      // TODO(chrishenry): We should tighten the API to accept\n      // !EventTarget|goog.events.Listenable, and add an assertion here.\n      return [];\n    }\n\n    var listenerMap = goog.events.getListenerMap_(\n        /** @type {!EventTarget} */ (obj));\n    return listenerMap ? listenerMap.getListeners(type, capture) : [];\n  }\n};\n\n\n/**\n * Gets the goog.events.Listener for the event or null if no such listener is\n * in use.\n *\n * @param {EventTarget|goog.events.Listenable} src The target from\n *     which to get listeners.\n * @param {?string|!goog.events.EventId<EVENTOBJ>} type The type of the event.\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to get.\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\n *                            whether the listener is fired during the\n *                            capture or bubble phase of the event.\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.ListenableKey} the found listener or null if not found.\n * @template EVENTOBJ\n */\ngoog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {\n  // TODO(chrishenry): Change type from ?string to string, or add assertion.\n  type = /** @type {string} */ (type);\n  listener = goog.events.wrapListener(listener);\n  var capture = !!opt_capt;\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.getListener(type, listener, capture, opt_handler);\n  }\n\n  if (!src) {\n    // TODO(chrishenry): We should tighten the API to only accept\n    // non-null objects, or add an assertion here.\n    return null;\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (src));\n  if (listenerMap) {\n    return listenerMap.getListener(type, listener, capture, opt_handler);\n  }\n  return null;\n};\n\n\n/**\n * Returns whether an event target has any active listeners matching the\n * specified signature. If either the type or capture parameters are\n * unspecified, the function will match on the remaining criteria.\n *\n * @param {EventTarget|goog.events.Listenable} obj Target to get\n *     listeners for.\n * @param {string|!goog.events.EventId=} opt_type Event type.\n * @param {boolean=} opt_capture Whether to check for capture or bubble-phase\n *     listeners.\n * @return {boolean} Whether an event target has one or more listeners matching\n *     the requested type and/or capture phase.\n */\ngoog.events.hasListener = function(obj, opt_type, opt_capture) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return obj.hasListener(opt_type, opt_capture);\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (obj));\n  return !!listenerMap && listenerMap.hasListener(opt_type, opt_capture);\n};\n\n\n/**\n * Provides a nice string showing the normalized event objects public members\n * @param {Object} e Event Object.\n * @return {string} String of the public members of the normalized event object.\n */\ngoog.events.expose = function(e) {\n  var str = [];\n  for (var key in e) {\n    if (e[key] && e[key].id) {\n      str.push(key + ' = ' + e[key] + ' (' + e[key].id + ')');\n    } else {\n      str.push(key + ' = ' + e[key]);\n    }\n  }\n  return str.join('\\n');\n};\n\n\n/**\n * Returns a string with on prepended to the specified type. This is used for IE\n * which expects \"on\" to be prepended. This function caches the string in order\n * to avoid extra allocations in steady state.\n * @param {string} type Event type.\n * @return {string} The type string with 'on' prepended.\n * @private\n */\ngoog.events.getOnString_ = function(type) {\n  if (type in goog.events.onStringMap_) {\n    return goog.events.onStringMap_[type];\n  }\n  return goog.events.onStringMap_[type] = goog.events.onString_ + type;\n};\n\n\n/**\n * Fires an object's listeners of a particular type and phase\n *\n * @param {Object} obj Object whose listeners to call.\n * @param {string|!goog.events.EventId} type Event type.\n * @param {boolean} capture Which event phase.\n * @param {Object} eventObject Event object to be passed to listener.\n * @return {boolean} True if all listeners returned true else false.\n */\ngoog.events.fireListeners = function(obj, type, capture, eventObject) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return /** @type {!goog.events.Listenable} */ (obj).fireListeners(\n        type, capture, eventObject);\n  }\n\n  return goog.events.fireListeners_(obj, type, capture, eventObject);\n};\n\n\n/**\n * Fires an object's listeners of a particular type and phase.\n * @param {Object} obj Object whose listeners to call.\n * @param {string|!goog.events.EventId} type Event type.\n * @param {boolean} capture Which event phase.\n * @param {Object} eventObject Event object to be passed to listener.\n * @return {boolean} True if all listeners returned true else false.\n * @private\n */\ngoog.events.fireListeners_ = function(obj, type, capture, eventObject) {\n  /** @type {boolean} */\n  var retval = true;\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {EventTarget} */ (obj));\n  if (listenerMap) {\n    // TODO(chrishenry): Original code avoids array creation when there\n    // is no listener, so we do the same. If this optimization turns\n    // out to be not required, we can replace this with\n    // listenerMap.getListeners(type, capture) instead, which is simpler.\n    var listenerArray = listenerMap.listeners[type.toString()];\n    if (listenerArray) {\n      listenerArray = listenerArray.concat();\n      for (var i = 0; i < listenerArray.length; i++) {\n        var listener = listenerArray[i];\n        // We might not have a listener if the listener was removed.\n        if (listener && listener.capture == capture && !listener.removed) {\n          var result = goog.events.fireListener(listener, eventObject);\n          retval = retval && (result !== false);\n        }\n      }\n    }\n  }\n  return retval;\n};\n\n\n/**\n * Fires a listener with a set of arguments\n *\n * @param {goog.events.Listener} listener The listener object to call.\n * @param {Object} eventObject The event object to pass to the listener.\n * @return {*} Result of listener.\n */\ngoog.events.fireListener = function(listener, eventObject) {\n  var listenerFn = listener.listener;\n  var listenerHandler = listener.handler || listener.src;\n\n  if (listener.callOnce) {\n    goog.events.unlistenByKey(listener);\n  }\n  return listenerFn.call(listenerHandler, eventObject);\n};\n\n\n/**\n * Gets the total number of listeners currently in the system.\n * @return {number} Number of listeners.\n * @deprecated This returns estimated count, now that Closure no longer\n * stores a central listener registry. We still return an estimation\n * to keep existing listener-related tests passing. In the near future,\n * this function will be removed.\n */\ngoog.events.getTotalListenerCount = function() {\n  return goog.events.listenerCountEstimate_;\n};\n\n\n/**\n * Dispatches an event (or event like object) and calls all listeners\n * listening for events of this type. The type of the event is decided by the\n * type property on the event object.\n *\n * If any of the listeners returns false OR calls preventDefault then this\n * function will return false.  If one of the capture listeners calls\n * stopPropagation, then the bubble listeners won't fire.\n *\n * @param {goog.events.Listenable} src The event target.\n * @param {goog.events.EventLike} e Event object.\n * @return {boolean} If anyone called preventDefault on the event object (or\n *     if any of the handlers returns false) this will also return false.\n *     If there are no handlers, or if all handlers return true, this returns\n *     true.\n */\ngoog.events.dispatchEvent = function(src, e) {\n  goog.asserts.assert(\n      goog.events.Listenable.isImplementedBy(src),\n      'Can not use goog.events.dispatchEvent with ' +\n          'non-goog.events.Listenable instance.');\n  return src.dispatchEvent(e);\n};\n\n\n/**\n * Installs exception protection for the browser event entry point using the\n * given error handler.\n *\n * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to\n *     protect the entry point.\n */\ngoog.events.protectBrowserEventEntryPoint = function(errorHandler) {\n  goog.events.handleBrowserEvent_ =\n      errorHandler.protectEntryPoint(goog.events.handleBrowserEvent_);\n};\n\n\n/**\n * Handles an event and dispatches it to the correct listeners. This\n * function is a proxy for the real listener the user specified.\n *\n * @param {goog.events.Listener} listener The listener object.\n * @param {Event=} opt_evt Optional event object that gets passed in via the\n *     native event handlers.\n * @return {*} Result of the event handler.\n * @this {EventTarget} The object or Element that fired the event.\n * @private\n */\ngoog.events.handleBrowserEvent_ = function(listener, opt_evt) {\n  if (listener.removed) {\n    return true;\n  }\n\n  // Synthesize event propagation if the browser does not support W3C\n  // event model.\n  if (!goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\n    var ieEvent = opt_evt ||\n        /** @type {Event} */ (goog.getObjectByName('window.event'));\n    var evt = new goog.events.BrowserEvent(ieEvent, this);\n    /** @type {*} */\n    var retval = true;\n\n    if (goog.events.CAPTURE_SIMULATION_MODE ==\n        goog.events.CaptureSimulationMode.ON) {\n      // If we have not marked this event yet, we should perform capture\n      // simulation.\n      if (!goog.events.isMarkedIeEvent_(ieEvent)) {\n        goog.events.markIeEvent_(ieEvent);\n\n        var ancestors = [];\n        for (var parent = evt.currentTarget; parent;\n             parent = parent.parentNode) {\n          ancestors.push(parent);\n        }\n\n        // Fire capture listeners.\n        var type = listener.type;\n        for (var i = ancestors.length - 1; !evt.propagationStopped_ && i >= 0;\n             i--) {\n          evt.currentTarget = ancestors[i];\n          var result =\n              goog.events.fireListeners_(ancestors[i], type, true, evt);\n          retval = retval && result;\n        }\n\n        // Fire bubble listeners.\n        //\n        // We can technically rely on IE to perform bubble event\n        // propagation. However, it turns out that IE fires events in\n        // opposite order of attachEvent registration, which broke\n        // some code and tests that rely on the order. (While W3C DOM\n        // Level 2 Events TR leaves the event ordering unspecified,\n        // modern browsers and W3C DOM Level 3 Events Working Draft\n        // actually specify the order as the registration order.)\n        for (var i = 0; !evt.propagationStopped_ && i < ancestors.length; i++) {\n          evt.currentTarget = ancestors[i];\n          var result =\n              goog.events.fireListeners_(ancestors[i], type, false, evt);\n          retval = retval && result;\n        }\n      }\n    } else {\n      retval = goog.events.fireListener(listener, evt);\n    }\n    return retval;\n  }\n\n  // Otherwise, simply fire the listener.\n  return goog.events.fireListener(\n      listener, new goog.events.BrowserEvent(opt_evt, this));\n};\n\n\n/**\n * This is used to mark the IE event object so we do not do the Closure pass\n * twice for a bubbling event.\n * @param {Event} e The IE browser event.\n * @private\n */\ngoog.events.markIeEvent_ = function(e) {\n  // Only the keyCode and the returnValue can be changed. We use keyCode for\n  // non keyboard events.\n  // event.returnValue is a bit more tricky. It is undefined by default. A\n  // boolean false prevents the default action. In a window.onbeforeunload and\n  // the returnValue is non undefined it will be alerted. However, we will only\n  // modify the returnValue for keyboard events. We can get a problem if non\n  // closure events sets the keyCode or the returnValue\n\n  var useReturnValue = false;\n\n  if (e.keyCode == 0) {\n    // We cannot change the keyCode in case that srcElement is input[type=file].\n    // We could test that that is the case but that would allocate 3 objects.\n    // If we use try/catch we will only allocate extra objects in the case of a\n    // failure.\n\n    try {\n      e.keyCode = -1;\n      return;\n    } catch (ex) {\n      useReturnValue = true;\n    }\n  }\n\n  if (useReturnValue ||\n      /** @type {boolean|undefined} */ (e.returnValue) == undefined) {\n    e.returnValue = true;\n  }\n};\n\n\n/**\n * This is used to check if an IE event has already been handled by the Closure\n * system so we do not do the Closure pass twice for a bubbling event.\n * @param {Event} e  The IE browser event.\n * @return {boolean} True if the event object has been marked.\n * @private\n */\ngoog.events.isMarkedIeEvent_ = function(e) {\n  return e.keyCode < 0 || e.returnValue != undefined;\n};\n\n\n/**\n * Counter to create unique event ids.\n * @private {number}\n */\ngoog.events.uniqueIdCounter_ = 0;\n\n\n/**\n * Creates a unique event id.\n *\n * @param {string} identifier The identifier.\n * @return {string} A unique identifier.\n * @idGenerator {unique}\n */\ngoog.events.getUniqueId = function(identifier) {\n  return identifier + '_' + goog.events.uniqueIdCounter_++;\n};\n\n\n/**\n * @param {EventTarget} src The source object.\n * @return {goog.events.ListenerMap} A listener map for the given\n *     source object, or null if none exists.\n * @private\n */\ngoog.events.getListenerMap_ = function(src) {\n  var listenerMap = src[goog.events.LISTENER_MAP_PROP_];\n  // IE serializes the property as well (e.g. when serializing outer\n  // HTML). So we must check that the value is of the correct type.\n  return listenerMap instanceof goog.events.ListenerMap ? listenerMap : null;\n};\n\n\n/**\n * Expando property for listener function wrapper for Object with\n * handleEvent.\n * @private @const {string}\n */\ngoog.events.LISTENER_WRAPPER_PROP_ =\n    '__closure_events_fn_' + ((Math.random() * 1e9) >>> 0);\n\n\n/**\n * @param {Object|Function} listener The listener function or an\n *     object that contains handleEvent method.\n * @return {!Function} Either the original function or a function that\n *     calls obj.handleEvent. If the same listener is passed to this\n *     function more than once, the same function is guaranteed to be\n *     returned.\n */\ngoog.events.wrapListener = function(listener) {\n  goog.asserts.assert(listener, 'Listener can not be null.');\n\n  if (goog.isFunction(listener)) {\n    return listener;\n  }\n\n  goog.asserts.assert(\n      listener.handleEvent, 'An object listener must have handleEvent method.');\n  if (!listener[goog.events.LISTENER_WRAPPER_PROP_]) {\n    listener[goog.events.LISTENER_WRAPPER_PROP_] = function(e) {\n      return /** @type {?} */ (listener).handleEvent(e);\n    };\n  }\n  return listener[goog.events.LISTENER_WRAPPER_PROP_];\n};\n\n\n// Register the browser event handler as an entry point, so that\n// it can be monitored for exception handling, etc.\ngoog.debug.entryPointRegistry.register(\n    /**\n     * @param {function(!Function): !Function} transformer The transforming\n     *     function.\n     */\n    function(transformer) {\n      goog.events.handleBrowserEvent_ =\n          transformer(goog.events.handleBrowserEvent_);\n    });\n","~:compiled-at",1613924115874,"~:source-map-json","{\n\"version\":3,\n\"file\":\"goog.events.events.js\",\n\"lineCount\":378,\n\"mappings\":\"AAqDAA,IAAA,CAAKC,OAAL,CAAa,aAAb,CAAA;AACAD,IAAA,CAAKC,OAAL,CAAa,mCAAb,CAAA;AACAD,IAAA,CAAKC,OAAL,CAAa,iBAAb,CAAA;AACAD,IA