diff --git a/dist/event-target-shim.js b/dist/event-target-shim.js
index 735b3c4..53ce220 100644
--- a/dist/event-target-shim.js
+++ b/dist/event-target-shim.js
@@ -46,7 +46,7 @@ function pd(event) {
     console.assert(
         retv != null,
         "'this' is expected an Event object, but got",
-        event,
+        event
     );
     return retv
 }
@@ -63,7 +63,7 @@ function setCancelFlag(data) {
         ) {
             console.error(
                 "Unable to preventDefault inside passive event listener invocation.",
-                data.passiveListener,
+                data.passiveListener
             );
         }
         return
@@ -405,7 +405,7 @@ function defineWrapper(BaseEvent, proto) {
                 key,
                 isFunc
                     ? defineCallDescriptor(key)
-                    : defineRedirectDescriptor(key),
+                    : defineRedirectDescriptor(key)
             );
         }
     }
@@ -527,7 +527,7 @@ function getListeners(eventTarget) {
     const listeners = listenersMap.get(eventTarget);
     if (listeners == null) {
         throw new TypeError(
-            "'this' is expected an EventTarget object, but got another value.",
+            "'this' is expected an EventTarget object, but got another value."
         )
     }
     return listeners
@@ -610,7 +610,7 @@ function defineEventAttribute(eventTargetPrototype, eventName) {
     Object.defineProperty(
         eventTargetPrototype,
         `on${eventName}`,
-        defineEventAttributeDescriptor(eventName),
+        defineEventAttributeDescriptor(eventName)
     );
 }
 
@@ -811,7 +811,7 @@ EventTarget.prototype = {
             // Call this listener
             setPassiveListener(
                 wrappedEvent,
-                node.passive ? node.listener : null,
+                node.passive ? node.listener : null
             );
             if (typeof node.listener === "function") {
                 try {
diff --git a/dist/event-target-shim.js.map b/dist/event-target-shim.js.map
index 24cb99c..76c67e7 100644
--- a/dist/event-target-shim.js.map
+++ b/dist/event-target-shim.js.map
@@ -1 +1 @@
-{"version":3,"file":"event-target-shim.js.map","sources":["../src/event.mjs","../src/event-target.mjs"],"sourcesContent":["/**\n * @typedef {object} PrivateData\n * @property {EventTarget} eventTarget The event target.\n * @property {{type:string}} event The original event object.\n * @property {number} eventPhase The current event phase.\n * @property {EventTarget|null} currentTarget The current event target.\n * @property {boolean} canceled The flag to prevent default.\n * @property {boolean} stopped The flag to stop propagation.\n * @property {boolean} immediateStopped The flag to stop propagation immediately.\n * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.\n * @property {number} timeStamp The unix time.\n * @private\n */\n\n/**\n * Private data for event wrappers.\n * @type {WeakMap<Event, PrivateData>}\n * @private\n */\nconst privateData = new WeakMap()\n\n/**\n * Cache for wrapper classes.\n * @type {WeakMap<Object, Function>}\n * @private\n */\nconst wrappers = new WeakMap()\n\n/**\n * Get private data.\n * @param {Event} event The event object to get private data.\n * @returns {PrivateData} The private data of the event.\n * @private\n */\nfunction pd(event) {\n    const retv = privateData.get(event)\n    console.assert(\n        retv != null,\n        \"'this' is expected an Event object, but got\",\n        event,\n    )\n    return retv\n}\n\n/**\n * https://dom.spec.whatwg.org/#set-the-canceled-flag\n * @param data {PrivateData} private data.\n */\nfunction setCancelFlag(data) {\n    if (data.passiveListener != null) {\n        if (\n            typeof console !== \"undefined\" &&\n            typeof console.error === \"function\"\n        ) {\n            console.error(\n                \"Unable to preventDefault inside passive event listener invocation.\",\n                data.passiveListener,\n            )\n        }\n        return\n    }\n    if (!data.event.cancelable) {\n        return\n    }\n\n    data.canceled = true\n    if (typeof data.event.preventDefault === \"function\") {\n        data.event.preventDefault()\n    }\n}\n\n/**\n * @see https://dom.spec.whatwg.org/#interface-event\n * @private\n */\n/**\n * The event wrapper.\n * @constructor\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Event|{type:string}} event The original event to wrap.\n */\nfunction Event(eventTarget, event) {\n    privateData.set(this, {\n        eventTarget,\n        event,\n        eventPhase: 2,\n        currentTarget: eventTarget,\n        canceled: false,\n        stopped: false,\n        immediateStopped: false,\n        passiveListener: null,\n        timeStamp: event.timeStamp || Date.now(),\n    })\n\n    // https://heycam.github.io/webidl/#Unforgeable\n    Object.defineProperty(this, \"isTrusted\", { value: false, enumerable: true })\n\n    // Define accessors\n    const keys = Object.keys(event)\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in this)) {\n            Object.defineProperty(this, key, defineRedirectDescriptor(key))\n        }\n    }\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEvent.prototype = {\n    /**\n     * The type of this event.\n     * @type {string}\n     */\n    get type() {\n        return pd(this).event.type\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get target() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get currentTarget() {\n        return pd(this).currentTarget\n    },\n\n    /**\n     * @returns {EventTarget[]} The composed path of this event.\n     */\n    composedPath() {\n        const currentTarget = pd(this).currentTarget\n        if (currentTarget == null) {\n            return []\n        }\n        return [currentTarget]\n    },\n\n    /**\n     * Constant of NONE.\n     * @type {number}\n     */\n    get NONE() {\n        return 0\n    },\n\n    /**\n     * Constant of CAPTURING_PHASE.\n     * @type {number}\n     */\n    get CAPTURING_PHASE() {\n        return 1\n    },\n\n    /**\n     * Constant of AT_TARGET.\n     * @type {number}\n     */\n    get AT_TARGET() {\n        return 2\n    },\n\n    /**\n     * Constant of BUBBLING_PHASE.\n     * @type {number}\n     */\n    get BUBBLING_PHASE() {\n        return 3\n    },\n\n    /**\n     * The target of this event.\n     * @type {number}\n     */\n    get eventPhase() {\n        return pd(this).eventPhase\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopPropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.stopPropagation === \"function\") {\n            data.event.stopPropagation()\n        }\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopImmediatePropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        data.immediateStopped = true\n        if (typeof data.event.stopImmediatePropagation === \"function\") {\n            data.event.stopImmediatePropagation()\n        }\n    },\n\n    /**\n     * The flag to be bubbling.\n     * @type {boolean}\n     */\n    get bubbles() {\n        return Boolean(pd(this).event.bubbles)\n    },\n\n    /**\n     * The flag to be cancelable.\n     * @type {boolean}\n     */\n    get cancelable() {\n        return Boolean(pd(this).event.cancelable)\n    },\n\n    /**\n     * Cancel this event.\n     * @returns {void}\n     */\n    preventDefault() {\n        setCancelFlag(pd(this))\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     */\n    get defaultPrevented() {\n        return pd(this).canceled\n    },\n\n    /**\n     * The flag to be composed.\n     * @type {boolean}\n     */\n    get composed() {\n        return Boolean(pd(this).event.composed)\n    },\n\n    /**\n     * The unix time of this event.\n     * @type {number}\n     */\n    get timeStamp() {\n        return pd(this).timeStamp\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     * @deprecated\n     */\n    get srcElement() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The flag to stop event bubbling.\n     * @type {boolean}\n     * @deprecated\n     */\n    get cancelBubble() {\n        return pd(this).stopped\n    },\n    set cancelBubble(value) {\n        if (!value) {\n            return\n        }\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.cancelBubble === \"boolean\") {\n            data.event.cancelBubble = true\n        }\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     * @deprecated\n     */\n    get returnValue() {\n        return !pd(this).canceled\n    },\n    set returnValue(value) {\n        if (!value) {\n            setCancelFlag(pd(this))\n        }\n    },\n\n    /**\n     * Initialize this event object. But do nothing under event dispatching.\n     * @param {string} type The event type.\n     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.\n     * @param {boolean} [cancelable=false] The flag to be possible to cancel.\n     * @deprecated\n     */\n    initEvent() {\n        // Do nothing.\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(Event.prototype, \"constructor\", {\n    value: Event,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `event instanceof window.Event` is `true`.\nif (typeof window !== \"undefined\" && typeof window.Event !== \"undefined\") {\n    Object.setPrototypeOf(Event.prototype, window.Event.prototype)\n\n    // Make association for wrappers.\n    wrappers.set(window.Event.prototype, Event)\n}\n\n/**\n * Get the property descriptor to redirect a given property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to redirect the property.\n * @private\n */\nfunction defineRedirectDescriptor(key) {\n    return {\n        get() {\n            return pd(this).event[key]\n        },\n        set(value) {\n            pd(this).event[key] = value\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Get the property descriptor to call a given method property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to call the method property.\n * @private\n */\nfunction defineCallDescriptor(key) {\n    return {\n        value() {\n            const event = pd(this).event\n            return event[key].apply(event, arguments)\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define new wrapper class.\n * @param {Function} BaseEvent The base wrapper class.\n * @param {Object} proto The prototype of the original event.\n * @returns {Function} The defined wrapper class.\n * @private\n */\nfunction defineWrapper(BaseEvent, proto) {\n    const keys = Object.keys(proto)\n    if (keys.length === 0) {\n        return BaseEvent\n    }\n\n    /** CustomEvent */\n    function CustomEvent(eventTarget, event) {\n        BaseEvent.call(this, eventTarget, event)\n    }\n\n    CustomEvent.prototype = Object.create(BaseEvent.prototype, {\n        constructor: { value: CustomEvent, configurable: true, writable: true },\n    })\n\n    // Define accessors.\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in BaseEvent.prototype)) {\n            const descriptor = Object.getOwnPropertyDescriptor(proto, key)\n            const isFunc = typeof descriptor.value === \"function\"\n            Object.defineProperty(\n                CustomEvent.prototype,\n                key,\n                isFunc\n                    ? defineCallDescriptor(key)\n                    : defineRedirectDescriptor(key),\n            )\n        }\n    }\n\n    return CustomEvent\n}\n\n/**\n * Get the wrapper class of a given prototype.\n * @param {Object} proto The prototype of the original event to get its wrapper.\n * @returns {Function} The wrapper class.\n * @private\n */\nfunction getWrapper(proto) {\n    if (proto == null || proto === Object.prototype) {\n        return Event\n    }\n\n    let wrapper = wrappers.get(proto)\n    if (wrapper == null) {\n        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto)\n        wrappers.set(proto, wrapper)\n    }\n    return wrapper\n}\n\n/**\n * Wrap a given event to management a dispatching.\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Object} event The event to wrap.\n * @returns {Event} The wrapper instance.\n * @private\n */\nexport function wrapEvent(eventTarget, event) {\n    const Wrapper = getWrapper(Object.getPrototypeOf(event))\n    return new Wrapper(eventTarget, event)\n}\n\n/**\n * Get the immediateStopped flag of a given event.\n * @param {Event} event The event to get.\n * @returns {boolean} The flag to stop propagation immediately.\n * @private\n */\nexport function isStopped(event) {\n    return pd(event).immediateStopped\n}\n\n/**\n * Set the current event phase of a given event.\n * @param {Event} event The event to set current target.\n * @param {number} eventPhase New event phase.\n * @returns {void}\n * @private\n */\nexport function setEventPhase(event, eventPhase) {\n    pd(event).eventPhase = eventPhase\n}\n\n/**\n * Set the current target of a given event.\n * @param {Event} event The event to set current target.\n * @param {EventTarget|null} currentTarget New current target.\n * @returns {void}\n * @private\n */\nexport function setCurrentTarget(event, currentTarget) {\n    pd(event).currentTarget = currentTarget\n}\n\n/**\n * Set a passive listener of a given event.\n * @param {Event} event The event to set current target.\n * @param {Function|null} passiveListener New passive listener.\n * @returns {void}\n * @private\n */\nexport function setPassiveListener(event, passiveListener) {\n    pd(event).passiveListener = passiveListener\n}\n","import {\n    isStopped,\n    setCurrentTarget,\n    setEventPhase,\n    setPassiveListener,\n    wrapEvent,\n} from \"./event.mjs\"\n\n/**\n * @typedef {object} ListenerNode\n * @property {Function} listener\n * @property {1|2|3} listenerType\n * @property {boolean} passive\n * @property {boolean} once\n * @property {ListenerNode|null} next\n * @private\n */\n\n/**\n * @type {WeakMap<object, Map<string, ListenerNode>>}\n * @private\n */\nconst listenersMap = new WeakMap()\n\n// Listener types\nconst CAPTURE = 1\nconst BUBBLE = 2\nconst ATTRIBUTE = 3\n\n/**\n * Check whether a given value is an object or not.\n * @param {any} x The value to check.\n * @returns {boolean} `true` if the value is an object.\n */\nfunction isObject(x) {\n    return x !== null && typeof x === \"object\" //eslint-disable-line no-restricted-syntax\n}\n\n/**\n * Get listeners.\n * @param {EventTarget} eventTarget The event target to get.\n * @returns {Map<string, ListenerNode>} The listeners.\n * @private\n */\nfunction getListeners(eventTarget) {\n    const listeners = listenersMap.get(eventTarget)\n    if (listeners == null) {\n        throw new TypeError(\n            \"'this' is expected an EventTarget object, but got another value.\",\n        )\n    }\n    return listeners\n}\n\n/**\n * Get the property descriptor for the event attribute of a given event.\n * @param {string} eventName The event name to get property descriptor.\n * @returns {PropertyDescriptor} The property descriptor.\n * @private\n */\nfunction defineEventAttributeDescriptor(eventName) {\n    return {\n        get() {\n            const listeners = getListeners(this)\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    return node.listener\n                }\n                node = node.next\n            }\n            return null\n        },\n\n        set(listener) {\n            if (typeof listener !== \"function\" && !isObject(listener)) {\n                listener = null // eslint-disable-line no-param-reassign\n            }\n            const listeners = getListeners(this)\n\n            // Traverse to the tail while removing old value.\n            let prev = null\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    // Remove old value.\n                    if (prev !== null) {\n                        prev.next = node.next\n                    } else if (node.next !== null) {\n                        listeners.set(eventName, node.next)\n                    } else {\n                        listeners.delete(eventName)\n                    }\n                } else {\n                    prev = node\n                }\n\n                node = node.next\n            }\n\n            // Add new value.\n            if (listener !== null) {\n                const newNode = {\n                    listener,\n                    listenerType: ATTRIBUTE,\n                    passive: false,\n                    once: false,\n                    next: null,\n                }\n                if (prev === null) {\n                    listeners.set(eventName, newNode)\n                } else {\n                    prev.next = newNode\n                }\n            }\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define an event attribute (e.g. `eventTarget.onclick`).\n * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.\n * @param {string} eventName The event name to define.\n * @returns {void}\n */\nfunction defineEventAttribute(eventTargetPrototype, eventName) {\n    Object.defineProperty(\n        eventTargetPrototype,\n        `on${eventName}`,\n        defineEventAttributeDescriptor(eventName),\n    )\n}\n\n/**\n * Define a custom EventTarget with event attributes.\n * @param {string[]} eventNames Event names for event attributes.\n * @returns {EventTarget} The custom EventTarget.\n * @private\n */\nfunction defineCustomEventTarget(eventNames) {\n    /** CustomEventTarget */\n    function CustomEventTarget() {\n        EventTarget.call(this)\n    }\n\n    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {\n        constructor: {\n            value: CustomEventTarget,\n            configurable: true,\n            writable: true,\n        },\n    })\n\n    for (let i = 0; i < eventNames.length; ++i) {\n        defineEventAttribute(CustomEventTarget.prototype, eventNames[i])\n    }\n\n    return CustomEventTarget\n}\n\n/**\n * EventTarget.\n *\n * - This is constructor if no arguments.\n * - This is a function which returns a CustomEventTarget constructor if there are arguments.\n *\n * For example:\n *\n *     class A extends EventTarget {}\n *     class B extends EventTarget(\"message\") {}\n *     class C extends EventTarget(\"message\", \"error\") {}\n *     class D extends EventTarget([\"message\", \"error\"]) {}\n */\nfunction EventTarget() {\n    /*eslint-disable consistent-return */\n    if (this instanceof EventTarget) {\n        listenersMap.set(this, new Map())\n        return\n    }\n    if (arguments.length === 1 && Array.isArray(arguments[0])) {\n        return defineCustomEventTarget(arguments[0])\n    }\n    if (arguments.length > 0) {\n        const types = new Array(arguments.length)\n        for (let i = 0; i < arguments.length; ++i) {\n            types[i] = arguments[i]\n        }\n        return defineCustomEventTarget(types)\n    }\n    throw new TypeError(\"Cannot call a class as a function\")\n    /*eslint-enable consistent-return */\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEventTarget.prototype = {\n    /**\n     * Add a given listener to this event target.\n     * @param {string} eventName The event name to add.\n     * @param {Function} listener The listener to add.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    addEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n        if (typeof listener !== \"function\" && !isObject(listener)) {\n            throw new TypeError(\"'listener' should be a function or an object.\")\n        }\n\n        const listeners = getListeners(this)\n        const optionsIsObj = isObject(options)\n        const capture = optionsIsObj\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n        const newNode = {\n            listener,\n            listenerType,\n            passive: optionsIsObj && Boolean(options.passive),\n            once: optionsIsObj && Boolean(options.once),\n            next: null,\n        }\n\n        // Set it as the first node if the first node is null.\n        let node = listeners.get(eventName)\n        if (node === undefined) {\n            listeners.set(eventName, newNode)\n            return\n        }\n\n        // Traverse to the tail while checking duplication..\n        let prev = null\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                // Should ignore duplication.\n                return\n            }\n            prev = node\n            node = node.next\n        }\n\n        // Add it.\n        prev.next = newNode\n    },\n\n    /**\n     * Remove a given listener from this event target.\n     * @param {string} eventName The event name to remove.\n     * @param {Function} listener The listener to remove.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    removeEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n\n        const listeners = getListeners(this)\n        const capture = isObject(options)\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n\n        let prev = null\n        let node = listeners.get(eventName)\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n                return\n            }\n\n            prev = node\n            node = node.next\n        }\n    },\n\n    /**\n     * Dispatch a given event.\n     * @param {Event|{type:string}} event The event to dispatch.\n     * @returns {boolean} `false` if canceled.\n     */\n    dispatchEvent(event) {\n        if (event == null || typeof event.type !== \"string\") {\n            throw new TypeError('\"event.type\" should be a string.')\n        }\n\n        // If listeners aren't registered, terminate.\n        const listeners = getListeners(this)\n        const eventName = event.type\n        let node = listeners.get(eventName)\n        if (node == null) {\n            return true\n        }\n\n        // Since we cannot rewrite several properties, so wrap object.\n        const wrappedEvent = wrapEvent(this, event)\n\n        // This doesn't process capturing phase and bubbling phase.\n        // This isn't participating in a tree.\n        let prev = null\n        while (node != null) {\n            // Remove this listener if it's once\n            if (node.once) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n            } else {\n                prev = node\n            }\n\n            // Call this listener\n            setPassiveListener(\n                wrappedEvent,\n                node.passive ? node.listener : null,\n            )\n            if (typeof node.listener === \"function\") {\n                try {\n                    node.listener.call(this, wrappedEvent)\n                } catch (err) {\n                    if (\n                        typeof console !== \"undefined\" &&\n                        typeof console.error === \"function\"\n                    ) {\n                        console.error(err)\n                    }\n                }\n            } else if (\n                node.listenerType !== ATTRIBUTE &&\n                typeof node.listener.handleEvent === \"function\"\n            ) {\n                node.listener.handleEvent(wrappedEvent)\n            }\n\n            // Break if `event.stopImmediatePropagation` was called.\n            if (isStopped(wrappedEvent)) {\n                break\n            }\n\n            node = node.next\n        }\n        setPassiveListener(wrappedEvent, null)\n        setEventPhase(wrappedEvent, 0)\n        setCurrentTarget(wrappedEvent, null)\n\n        return !wrappedEvent.defaultPrevented\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(EventTarget.prototype, \"constructor\", {\n    value: EventTarget,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `eventTarget instanceof window.EventTarget` is `true`.\nif (\n    typeof window !== \"undefined\" &&\n    typeof window.EventTarget !== \"undefined\"\n) {\n    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype)\n}\n\nexport { defineEventAttribute, EventTarget }\nexport default 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+{"version":3,"file":"event-target-shim.js.map","sources":["../src/event.mjs","../src/event-target.mjs"],"sourcesContent":["/**\n * @typedef {object} PrivateData\n * @property {EventTarget} eventTarget The event target.\n * @property {{type:string}} event The original event object.\n * @property {number} eventPhase The current event phase.\n * @property {EventTarget|null} currentTarget The current event target.\n * @property {boolean} canceled The flag to prevent default.\n * @property {boolean} stopped The flag to stop propagation.\n * @property {boolean} immediateStopped The flag to stop propagation immediately.\n * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.\n * @property {number} timeStamp The unix time.\n * @private\n */\n\n/**\n * Private data for event wrappers.\n * @type {WeakMap<Event, PrivateData>}\n * @private\n */\nconst privateData = new WeakMap()\n\n/**\n * Cache for wrapper classes.\n * @type {WeakMap<Object, Function>}\n * @private\n */\nconst wrappers = new WeakMap()\n\n/**\n * Get private data.\n * @param {Event} event The event object to get private data.\n * @returns {PrivateData} The private data of the event.\n * @private\n */\nfunction pd(event) {\n    const retv = privateData.get(event)\n    console.assert(\n        retv != null,\n        \"'this' is expected an Event object, but got\",\n        event\n    )\n    return retv\n}\n\n/**\n * https://dom.spec.whatwg.org/#set-the-canceled-flag\n * @param data {PrivateData} private data.\n */\nfunction setCancelFlag(data) {\n    if (data.passiveListener != null) {\n        if (\n            typeof console !== \"undefined\" &&\n            typeof console.error === \"function\"\n        ) {\n            console.error(\n                \"Unable to preventDefault inside passive event listener invocation.\",\n                data.passiveListener\n            )\n        }\n        return\n    }\n    if (!data.event.cancelable) {\n        return\n    }\n\n    data.canceled = true\n    if (typeof data.event.preventDefault === \"function\") {\n        data.event.preventDefault()\n    }\n}\n\n/**\n * @see https://dom.spec.whatwg.org/#interface-event\n * @private\n */\n/**\n * The event wrapper.\n * @constructor\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Event|{type:string}} event The original event to wrap.\n */\nfunction Event(eventTarget, event) {\n    privateData.set(this, {\n        eventTarget,\n        event,\n        eventPhase: 2,\n        currentTarget: eventTarget,\n        canceled: false,\n        stopped: false,\n        immediateStopped: false,\n        passiveListener: null,\n        timeStamp: event.timeStamp || Date.now(),\n    })\n\n    // https://heycam.github.io/webidl/#Unforgeable\n    Object.defineProperty(this, \"isTrusted\", { value: false, enumerable: true })\n\n    // Define accessors\n    const keys = Object.keys(event)\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in this)) {\n            Object.defineProperty(this, key, defineRedirectDescriptor(key))\n        }\n    }\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEvent.prototype = {\n    /**\n     * The type of this event.\n     * @type {string}\n     */\n    get type() {\n        return pd(this).event.type\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get target() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get currentTarget() {\n        return pd(this).currentTarget\n    },\n\n    /**\n     * @returns {EventTarget[]} The composed path of this event.\n     */\n    composedPath() {\n        const currentTarget = pd(this).currentTarget\n        if (currentTarget == null) {\n            return []\n        }\n        return [currentTarget]\n    },\n\n    /**\n     * Constant of NONE.\n     * @type {number}\n     */\n    get NONE() {\n        return 0\n    },\n\n    /**\n     * Constant of CAPTURING_PHASE.\n     * @type {number}\n     */\n    get CAPTURING_PHASE() {\n        return 1\n    },\n\n    /**\n     * Constant of AT_TARGET.\n     * @type {number}\n     */\n    get AT_TARGET() {\n        return 2\n    },\n\n    /**\n     * Constant of BUBBLING_PHASE.\n     * @type {number}\n     */\n    get BUBBLING_PHASE() {\n        return 3\n    },\n\n    /**\n     * The target of this event.\n     * @type {number}\n     */\n    get eventPhase() {\n        return pd(this).eventPhase\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopPropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.stopPropagation === \"function\") {\n            data.event.stopPropagation()\n        }\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopImmediatePropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        data.immediateStopped = true\n        if (typeof data.event.stopImmediatePropagation === \"function\") {\n            data.event.stopImmediatePropagation()\n        }\n    },\n\n    /**\n     * The flag to be bubbling.\n     * @type {boolean}\n     */\n    get bubbles() {\n        return Boolean(pd(this).event.bubbles)\n    },\n\n    /**\n     * The flag to be cancelable.\n     * @type {boolean}\n     */\n    get cancelable() {\n        return Boolean(pd(this).event.cancelable)\n    },\n\n    /**\n     * Cancel this event.\n     * @returns {void}\n     */\n    preventDefault() {\n        setCancelFlag(pd(this))\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     */\n    get defaultPrevented() {\n        return pd(this).canceled\n    },\n\n    /**\n     * The flag to be composed.\n     * @type {boolean}\n     */\n    get composed() {\n        return Boolean(pd(this).event.composed)\n    },\n\n    /**\n     * The unix time of this event.\n     * @type {number}\n     */\n    get timeStamp() {\n        return pd(this).timeStamp\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     * @deprecated\n     */\n    get srcElement() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The flag to stop event bubbling.\n     * @type {boolean}\n     * @deprecated\n     */\n    get cancelBubble() {\n        return pd(this).stopped\n    },\n    set cancelBubble(value) {\n        if (!value) {\n            return\n        }\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.cancelBubble === \"boolean\") {\n            data.event.cancelBubble = true\n        }\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     * @deprecated\n     */\n    get returnValue() {\n        return !pd(this).canceled\n    },\n    set returnValue(value) {\n        if (!value) {\n            setCancelFlag(pd(this))\n        }\n    },\n\n    /**\n     * Initialize this event object. But do nothing under event dispatching.\n     * @param {string} type The event type.\n     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.\n     * @param {boolean} [cancelable=false] The flag to be possible to cancel.\n     * @deprecated\n     */\n    initEvent() {\n        // Do nothing.\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(Event.prototype, \"constructor\", {\n    value: Event,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `event instanceof window.Event` is `true`.\nif (typeof window !== \"undefined\" && typeof window.Event !== \"undefined\") {\n    Object.setPrototypeOf(Event.prototype, window.Event.prototype)\n\n    // Make association for wrappers.\n    wrappers.set(window.Event.prototype, Event)\n}\n\n/**\n * Get the property descriptor to redirect a given property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to redirect the property.\n * @private\n */\nfunction defineRedirectDescriptor(key) {\n    return {\n        get() {\n            return pd(this).event[key]\n        },\n        set(value) {\n            pd(this).event[key] = value\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Get the property descriptor to call a given method property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to call the method property.\n * @private\n */\nfunction defineCallDescriptor(key) {\n    return {\n        value() {\n            const event = pd(this).event\n            return event[key].apply(event, arguments)\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define new wrapper class.\n * @param {Function} BaseEvent The base wrapper class.\n * @param {Object} proto The prototype of the original event.\n * @returns {Function} The defined wrapper class.\n * @private\n */\nfunction defineWrapper(BaseEvent, proto) {\n    const keys = Object.keys(proto)\n    if (keys.length === 0) {\n        return BaseEvent\n    }\n\n    /** CustomEvent */\n    function CustomEvent(eventTarget, event) {\n        BaseEvent.call(this, eventTarget, event)\n    }\n\n    CustomEvent.prototype = Object.create(BaseEvent.prototype, {\n        constructor: { value: CustomEvent, configurable: true, writable: true },\n    })\n\n    // Define accessors.\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in BaseEvent.prototype)) {\n            const descriptor = Object.getOwnPropertyDescriptor(proto, key)\n            const isFunc = typeof descriptor.value === \"function\"\n            Object.defineProperty(\n                CustomEvent.prototype,\n                key,\n                isFunc\n                    ? defineCallDescriptor(key)\n                    : defineRedirectDescriptor(key)\n            )\n        }\n    }\n\n    return CustomEvent\n}\n\n/**\n * Get the wrapper class of a given prototype.\n * @param {Object} proto The prototype of the original event to get its wrapper.\n * @returns {Function} The wrapper class.\n * @private\n */\nfunction getWrapper(proto) {\n    if (proto == null || proto === Object.prototype) {\n        return Event\n    }\n\n    let wrapper = wrappers.get(proto)\n    if (wrapper == null) {\n        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto)\n        wrappers.set(proto, wrapper)\n    }\n    return wrapper\n}\n\n/**\n * Wrap a given event to management a dispatching.\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Object} event The event to wrap.\n * @returns {Event} The wrapper instance.\n * @private\n */\nexport function wrapEvent(eventTarget, event) {\n    const Wrapper = getWrapper(Object.getPrototypeOf(event))\n    return new Wrapper(eventTarget, event)\n}\n\n/**\n * Get the immediateStopped flag of a given event.\n * @param {Event} event The event to get.\n * @returns {boolean} The flag to stop propagation immediately.\n * @private\n */\nexport function isStopped(event) {\n    return pd(event).immediateStopped\n}\n\n/**\n * Set the current event phase of a given event.\n * @param {Event} event The event to set current target.\n * @param {number} eventPhase New event phase.\n * @returns {void}\n * @private\n */\nexport function setEventPhase(event, eventPhase) {\n    pd(event).eventPhase = eventPhase\n}\n\n/**\n * Set the current target of a given event.\n * @param {Event} event The event to set current target.\n * @param {EventTarget|null} currentTarget New current target.\n * @returns {void}\n * @private\n */\nexport function setCurrentTarget(event, currentTarget) {\n    pd(event).currentTarget = currentTarget\n}\n\n/**\n * Set a passive listener of a given event.\n * @param {Event} event The event to set current target.\n * @param {Function|null} passiveListener New passive listener.\n * @returns {void}\n * @private\n */\nexport function setPassiveListener(event, passiveListener) {\n    pd(event).passiveListener = passiveListener\n}\n","import {\n    isStopped,\n    setCurrentTarget,\n    setEventPhase,\n    setPassiveListener,\n    wrapEvent,\n} from \"./event.mjs\"\n\n/**\n * @typedef {object} ListenerNode\n * @property {Function} listener\n * @property {1|2|3} listenerType\n * @property {boolean} passive\n * @property {boolean} once\n * @property {ListenerNode|null} next\n * @private\n */\n\n/**\n * @type {WeakMap<object, Map<string, ListenerNode>>}\n * @private\n */\nconst listenersMap = new WeakMap()\n\n// Listener types\nconst CAPTURE = 1\nconst BUBBLE = 2\nconst ATTRIBUTE = 3\n\n/**\n * Check whether a given value is an object or not.\n * @param {any} x The value to check.\n * @returns {boolean} `true` if the value is an object.\n */\nfunction isObject(x) {\n    return x !== null && typeof x === \"object\" //eslint-disable-line no-restricted-syntax\n}\n\n/**\n * Get listeners.\n * @param {EventTarget} eventTarget The event target to get.\n * @returns {Map<string, ListenerNode>} The listeners.\n * @private\n */\nfunction getListeners(eventTarget) {\n    const listeners = listenersMap.get(eventTarget)\n    if (listeners == null) {\n        throw new TypeError(\n            \"'this' is expected an EventTarget object, but got another value.\"\n        )\n    }\n    return listeners\n}\n\n/**\n * Get the property descriptor for the event attribute of a given event.\n * @param {string} eventName The event name to get property descriptor.\n * @returns {PropertyDescriptor} The property descriptor.\n * @private\n */\nfunction defineEventAttributeDescriptor(eventName) {\n    return {\n        get() {\n            const listeners = getListeners(this)\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    return node.listener\n                }\n                node = node.next\n            }\n            return null\n        },\n\n        set(listener) {\n            if (typeof listener !== \"function\" && !isObject(listener)) {\n                listener = null // eslint-disable-line no-param-reassign\n            }\n            const listeners = getListeners(this)\n\n            // Traverse to the tail while removing old value.\n            let prev = null\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    // Remove old value.\n                    if (prev !== null) {\n                        prev.next = node.next\n                    } else if (node.next !== null) {\n                        listeners.set(eventName, node.next)\n                    } else {\n                        listeners.delete(eventName)\n                    }\n                } else {\n                    prev = node\n                }\n\n                node = node.next\n            }\n\n            // Add new value.\n            if (listener !== null) {\n                const newNode = {\n                    listener,\n                    listenerType: ATTRIBUTE,\n                    passive: false,\n                    once: false,\n                    next: null,\n                }\n                if (prev === null) {\n                    listeners.set(eventName, newNode)\n                } else {\n                    prev.next = newNode\n                }\n            }\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define an event attribute (e.g. `eventTarget.onclick`).\n * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.\n * @param {string} eventName The event name to define.\n * @returns {void}\n */\nfunction defineEventAttribute(eventTargetPrototype, eventName) {\n    Object.defineProperty(\n        eventTargetPrototype,\n        `on${eventName}`,\n        defineEventAttributeDescriptor(eventName)\n    )\n}\n\n/**\n * Define a custom EventTarget with event attributes.\n * @param {string[]} eventNames Event names for event attributes.\n * @returns {EventTarget} The custom EventTarget.\n * @private\n */\nfunction defineCustomEventTarget(eventNames) {\n    /** CustomEventTarget */\n    function CustomEventTarget() {\n        EventTarget.call(this)\n    }\n\n    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {\n        constructor: {\n            value: CustomEventTarget,\n            configurable: true,\n            writable: true,\n        },\n    })\n\n    for (let i = 0; i < eventNames.length; ++i) {\n        defineEventAttribute(CustomEventTarget.prototype, eventNames[i])\n    }\n\n    return CustomEventTarget\n}\n\n/**\n * EventTarget.\n *\n * - This is constructor if no arguments.\n * - This is a function which returns a CustomEventTarget constructor if there are arguments.\n *\n * For example:\n *\n *     class A extends EventTarget {}\n *     class B extends EventTarget(\"message\") {}\n *     class C extends EventTarget(\"message\", \"error\") {}\n *     class D extends EventTarget([\"message\", \"error\"]) {}\n */\nfunction EventTarget() {\n    /*eslint-disable consistent-return */\n    if (this instanceof EventTarget) {\n        listenersMap.set(this, new Map())\n        return\n    }\n    if (arguments.length === 1 && Array.isArray(arguments[0])) {\n        return defineCustomEventTarget(arguments[0])\n    }\n    if (arguments.length > 0) {\n        const types = new Array(arguments.length)\n        for (let i = 0; i < arguments.length; ++i) {\n            types[i] = arguments[i]\n        }\n        return defineCustomEventTarget(types)\n    }\n    throw new TypeError(\"Cannot call a class as a function\")\n    /*eslint-enable consistent-return */\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEventTarget.prototype = {\n    /**\n     * Add a given listener to this event target.\n     * @param {string} eventName The event name to add.\n     * @param {Function} listener The listener to add.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    addEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n        if (typeof listener !== \"function\" && !isObject(listener)) {\n            throw new TypeError(\"'listener' should be a function or an object.\")\n        }\n\n        const listeners = getListeners(this)\n        const optionsIsObj = isObject(options)\n        const capture = optionsIsObj\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n        const newNode = {\n            listener,\n            listenerType,\n            passive: optionsIsObj && Boolean(options.passive),\n            once: optionsIsObj && Boolean(options.once),\n            next: null,\n        }\n\n        // Set it as the first node if the first node is null.\n        let node = listeners.get(eventName)\n        if (node === undefined) {\n            listeners.set(eventName, newNode)\n            return\n        }\n\n        // Traverse to the tail while checking duplication..\n        let prev = null\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                // Should ignore duplication.\n                return\n            }\n            prev = node\n            node = node.next\n        }\n\n        // Add it.\n        prev.next = newNode\n    },\n\n    /**\n     * Remove a given listener from this event target.\n     * @param {string} eventName The event name to remove.\n     * @param {Function} listener The listener to remove.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    removeEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n\n        const listeners = getListeners(this)\n        const capture = isObject(options)\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n\n        let prev = null\n        let node = listeners.get(eventName)\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n                return\n            }\n\n            prev = node\n            node = node.next\n        }\n    },\n\n    /**\n     * Dispatch a given event.\n     * @param {Event|{type:string}} event The event to dispatch.\n     * @returns {boolean} `false` if canceled.\n     */\n    dispatchEvent(event) {\n        if (event == null || typeof event.type !== \"string\") {\n            throw new TypeError('\"event.type\" should be a string.')\n        }\n\n        // If listeners aren't registered, terminate.\n        const listeners = getListeners(this)\n        const eventName = event.type\n        let node = listeners.get(eventName)\n        if (node == null) {\n            return true\n        }\n\n        // Since we cannot rewrite several properties, so wrap object.\n        const wrappedEvent = wrapEvent(this, event)\n\n        // This doesn't process capturing phase and bubbling phase.\n        // This isn't participating in a tree.\n        let prev = null\n        while (node != null) {\n            // Remove this listener if it's once\n            if (node.once) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n            } else {\n                prev = node\n            }\n\n            // Call this listener\n            setPassiveListener(\n                wrappedEvent,\n                node.passive ? node.listener : null\n            )\n            if (typeof node.listener === \"function\") {\n                try {\n                    node.listener.call(this, wrappedEvent)\n                } catch (err) {\n                    if (\n                        typeof console !== \"undefined\" &&\n                        typeof console.error === \"function\"\n                    ) {\n                        console.error(err)\n                    }\n                }\n            } else if (\n                node.listenerType !== ATTRIBUTE &&\n                typeof node.listener.handleEvent === \"function\"\n            ) {\n                node.listener.handleEvent(wrappedEvent)\n            }\n\n            // Break if `event.stopImmediatePropagation` was called.\n            if (isStopped(wrappedEvent)) {\n                break\n            }\n\n            node = node.next\n        }\n        setPassiveListener(wrappedEvent, null)\n        setEventPhase(wrappedEvent, 0)\n        setCurrentTarget(wrappedEvent, null)\n\n        return !wrappedEvent.defaultPrevented\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(EventTarget.prototype, \"constructor\", {\n    value: EventTarget,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `eventTarget instanceof window.EventTarget` is `true`.\nif (\n    typeof window !== \"undefined\" &&\n    typeof window.EventTarget !== \"undefined\"\n) {\n    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype)\n}\n\nexport { defineEventAttribute, EventTarget }\nexport default 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\ No newline at end of file
diff --git a/dist/event-target-shim.mjs b/dist/event-target-shim.mjs
index 99d189d..114f3a1 100644
--- a/dist/event-target-shim.mjs
+++ b/dist/event-target-shim.mjs
@@ -42,7 +42,7 @@ function pd(event) {
     console.assert(
         retv != null,
         "'this' is expected an Event object, but got",
-        event,
+        event
     );
     return retv
 }
@@ -59,7 +59,7 @@ function setCancelFlag(data) {
         ) {
             console.error(
                 "Unable to preventDefault inside passive event listener invocation.",
-                data.passiveListener,
+                data.passiveListener
             );
         }
         return
@@ -401,7 +401,7 @@ function defineWrapper(BaseEvent, proto) {
                 key,
                 isFunc
                     ? defineCallDescriptor(key)
-                    : defineRedirectDescriptor(key),
+                    : defineRedirectDescriptor(key)
             );
         }
     }
@@ -523,7 +523,7 @@ function getListeners(eventTarget) {
     const listeners = listenersMap.get(eventTarget);
     if (listeners == null) {
         throw new TypeError(
-            "'this' is expected an EventTarget object, but got another value.",
+            "'this' is expected an EventTarget object, but got another value."
         )
     }
     return listeners
@@ -606,7 +606,7 @@ function defineEventAttribute(eventTargetPrototype, eventName) {
     Object.defineProperty(
         eventTargetPrototype,
         `on${eventName}`,
-        defineEventAttributeDescriptor(eventName),
+        defineEventAttributeDescriptor(eventName)
     );
 }
 
@@ -807,7 +807,7 @@ EventTarget.prototype = {
             // Call this listener
             setPassiveListener(
                 wrappedEvent,
-                node.passive ? node.listener : null,
+                node.passive ? node.listener : null
             );
             if (typeof node.listener === "function") {
                 try {
diff --git a/dist/event-target-shim.mjs.map b/dist/event-target-shim.mjs.map
index c46943f..7d3b9fb 100644
--- a/dist/event-target-shim.mjs.map
+++ b/dist/event-target-shim.mjs.map
@@ -1 +1 @@
-{"version":3,"file":"event-target-shim.mjs.map","sources":["../src/event.mjs","../src/event-target.mjs"],"sourcesContent":["/**\n * @typedef {object} PrivateData\n * @property {EventTarget} eventTarget The event target.\n * @property {{type:string}} event The original event object.\n * @property {number} eventPhase The current event phase.\n * @property {EventTarget|null} currentTarget The current event target.\n * @property {boolean} canceled The flag to prevent default.\n * @property {boolean} stopped The flag to stop propagation.\n * @property {boolean} immediateStopped The flag to stop propagation immediately.\n * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.\n * @property {number} timeStamp The unix time.\n * @private\n */\n\n/**\n * Private data for event wrappers.\n * @type {WeakMap<Event, PrivateData>}\n * @private\n */\nconst privateData = new WeakMap()\n\n/**\n * Cache for wrapper classes.\n * @type {WeakMap<Object, Function>}\n * @private\n */\nconst wrappers = new WeakMap()\n\n/**\n * Get private data.\n * @param {Event} event The event object to get private data.\n * @returns {PrivateData} The private data of the event.\n * @private\n */\nfunction pd(event) {\n    const retv = privateData.get(event)\n    console.assert(\n        retv != null,\n        \"'this' is expected an Event object, but got\",\n        event,\n    )\n    return retv\n}\n\n/**\n * https://dom.spec.whatwg.org/#set-the-canceled-flag\n * @param data {PrivateData} private data.\n */\nfunction setCancelFlag(data) {\n    if (data.passiveListener != null) {\n        if (\n            typeof console !== \"undefined\" &&\n            typeof console.error === \"function\"\n        ) {\n            console.error(\n                \"Unable to preventDefault inside passive event listener invocation.\",\n                data.passiveListener,\n            )\n        }\n        return\n    }\n    if (!data.event.cancelable) {\n        return\n    }\n\n    data.canceled = true\n    if (typeof data.event.preventDefault === \"function\") {\n        data.event.preventDefault()\n    }\n}\n\n/**\n * @see https://dom.spec.whatwg.org/#interface-event\n * @private\n */\n/**\n * The event wrapper.\n * @constructor\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Event|{type:string}} event The original event to wrap.\n */\nfunction Event(eventTarget, event) {\n    privateData.set(this, {\n        eventTarget,\n        event,\n        eventPhase: 2,\n        currentTarget: eventTarget,\n        canceled: false,\n        stopped: false,\n        immediateStopped: false,\n        passiveListener: null,\n        timeStamp: event.timeStamp || Date.now(),\n    })\n\n    // https://heycam.github.io/webidl/#Unforgeable\n    Object.defineProperty(this, \"isTrusted\", { value: false, enumerable: true })\n\n    // Define accessors\n    const keys = Object.keys(event)\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in this)) {\n            Object.defineProperty(this, key, defineRedirectDescriptor(key))\n        }\n    }\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEvent.prototype = {\n    /**\n     * The type of this event.\n     * @type {string}\n     */\n    get type() {\n        return pd(this).event.type\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get target() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get currentTarget() {\n        return pd(this).currentTarget\n    },\n\n    /**\n     * @returns {EventTarget[]} The composed path of this event.\n     */\n    composedPath() {\n        const currentTarget = pd(this).currentTarget\n        if (currentTarget == null) {\n            return []\n        }\n        return [currentTarget]\n    },\n\n    /**\n     * Constant of NONE.\n     * @type {number}\n     */\n    get NONE() {\n        return 0\n    },\n\n    /**\n     * Constant of CAPTURING_PHASE.\n     * @type {number}\n     */\n    get CAPTURING_PHASE() {\n        return 1\n    },\n\n    /**\n     * Constant of AT_TARGET.\n     * @type {number}\n     */\n    get AT_TARGET() {\n        return 2\n    },\n\n    /**\n     * Constant of BUBBLING_PHASE.\n     * @type {number}\n     */\n    get BUBBLING_PHASE() {\n        return 3\n    },\n\n    /**\n     * The target of this event.\n     * @type {number}\n     */\n    get eventPhase() {\n        return pd(this).eventPhase\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopPropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.stopPropagation === \"function\") {\n            data.event.stopPropagation()\n        }\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopImmediatePropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        data.immediateStopped = true\n        if (typeof data.event.stopImmediatePropagation === \"function\") {\n            data.event.stopImmediatePropagation()\n        }\n    },\n\n    /**\n     * The flag to be bubbling.\n     * @type {boolean}\n     */\n    get bubbles() {\n        return Boolean(pd(this).event.bubbles)\n    },\n\n    /**\n     * The flag to be cancelable.\n     * @type {boolean}\n     */\n    get cancelable() {\n        return Boolean(pd(this).event.cancelable)\n    },\n\n    /**\n     * Cancel this event.\n     * @returns {void}\n     */\n    preventDefault() {\n        setCancelFlag(pd(this))\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     */\n    get defaultPrevented() {\n        return pd(this).canceled\n    },\n\n    /**\n     * The flag to be composed.\n     * @type {boolean}\n     */\n    get composed() {\n        return Boolean(pd(this).event.composed)\n    },\n\n    /**\n     * The unix time of this event.\n     * @type {number}\n     */\n    get timeStamp() {\n        return pd(this).timeStamp\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     * @deprecated\n     */\n    get srcElement() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The flag to stop event bubbling.\n     * @type {boolean}\n     * @deprecated\n     */\n    get cancelBubble() {\n        return pd(this).stopped\n    },\n    set cancelBubble(value) {\n        if (!value) {\n            return\n        }\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.cancelBubble === \"boolean\") {\n            data.event.cancelBubble = true\n        }\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     * @deprecated\n     */\n    get returnValue() {\n        return !pd(this).canceled\n    },\n    set returnValue(value) {\n        if (!value) {\n            setCancelFlag(pd(this))\n        }\n    },\n\n    /**\n     * Initialize this event object. But do nothing under event dispatching.\n     * @param {string} type The event type.\n     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.\n     * @param {boolean} [cancelable=false] The flag to be possible to cancel.\n     * @deprecated\n     */\n    initEvent() {\n        // Do nothing.\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(Event.prototype, \"constructor\", {\n    value: Event,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `event instanceof window.Event` is `true`.\nif (typeof window !== \"undefined\" && typeof window.Event !== \"undefined\") {\n    Object.setPrototypeOf(Event.prototype, window.Event.prototype)\n\n    // Make association for wrappers.\n    wrappers.set(window.Event.prototype, Event)\n}\n\n/**\n * Get the property descriptor to redirect a given property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to redirect the property.\n * @private\n */\nfunction defineRedirectDescriptor(key) {\n    return {\n        get() {\n            return pd(this).event[key]\n        },\n        set(value) {\n            pd(this).event[key] = value\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Get the property descriptor to call a given method property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to call the method property.\n * @private\n */\nfunction defineCallDescriptor(key) {\n    return {\n        value() {\n            const event = pd(this).event\n            return event[key].apply(event, arguments)\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define new wrapper class.\n * @param {Function} BaseEvent The base wrapper class.\n * @param {Object} proto The prototype of the original event.\n * @returns {Function} The defined wrapper class.\n * @private\n */\nfunction defineWrapper(BaseEvent, proto) {\n    const keys = Object.keys(proto)\n    if (keys.length === 0) {\n        return BaseEvent\n    }\n\n    /** CustomEvent */\n    function CustomEvent(eventTarget, event) {\n        BaseEvent.call(this, eventTarget, event)\n    }\n\n    CustomEvent.prototype = Object.create(BaseEvent.prototype, {\n        constructor: { value: CustomEvent, configurable: true, writable: true },\n    })\n\n    // Define accessors.\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in BaseEvent.prototype)) {\n            const descriptor = Object.getOwnPropertyDescriptor(proto, key)\n            const isFunc = typeof descriptor.value === \"function\"\n            Object.defineProperty(\n                CustomEvent.prototype,\n                key,\n                isFunc\n                    ? defineCallDescriptor(key)\n                    : defineRedirectDescriptor(key),\n            )\n        }\n    }\n\n    return CustomEvent\n}\n\n/**\n * Get the wrapper class of a given prototype.\n * @param {Object} proto The prototype of the original event to get its wrapper.\n * @returns {Function} The wrapper class.\n * @private\n */\nfunction getWrapper(proto) {\n    if (proto == null || proto === Object.prototype) {\n        return Event\n    }\n\n    let wrapper = wrappers.get(proto)\n    if (wrapper == null) {\n        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto)\n        wrappers.set(proto, wrapper)\n    }\n    return wrapper\n}\n\n/**\n * Wrap a given event to management a dispatching.\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Object} event The event to wrap.\n * @returns {Event} The wrapper instance.\n * @private\n */\nexport function wrapEvent(eventTarget, event) {\n    const Wrapper = getWrapper(Object.getPrototypeOf(event))\n    return new Wrapper(eventTarget, event)\n}\n\n/**\n * Get the immediateStopped flag of a given event.\n * @param {Event} event The event to get.\n * @returns {boolean} The flag to stop propagation immediately.\n * @private\n */\nexport function isStopped(event) {\n    return pd(event).immediateStopped\n}\n\n/**\n * Set the current event phase of a given event.\n * @param {Event} event The event to set current target.\n * @param {number} eventPhase New event phase.\n * @returns {void}\n * @private\n */\nexport function setEventPhase(event, eventPhase) {\n    pd(event).eventPhase = eventPhase\n}\n\n/**\n * Set the current target of a given event.\n * @param {Event} event The event to set current target.\n * @param {EventTarget|null} currentTarget New current target.\n * @returns {void}\n * @private\n */\nexport function setCurrentTarget(event, currentTarget) {\n    pd(event).currentTarget = currentTarget\n}\n\n/**\n * Set a passive listener of a given event.\n * @param {Event} event The event to set current target.\n * @param {Function|null} passiveListener New passive listener.\n * @returns {void}\n * @private\n */\nexport function setPassiveListener(event, passiveListener) {\n    pd(event).passiveListener = passiveListener\n}\n","import {\n    isStopped,\n    setCurrentTarget,\n    setEventPhase,\n    setPassiveListener,\n    wrapEvent,\n} from \"./event.mjs\"\n\n/**\n * @typedef {object} ListenerNode\n * @property {Function} listener\n * @property {1|2|3} listenerType\n * @property {boolean} passive\n * @property {boolean} once\n * @property {ListenerNode|null} next\n * @private\n */\n\n/**\n * @type {WeakMap<object, Map<string, ListenerNode>>}\n * @private\n */\nconst listenersMap = new WeakMap()\n\n// Listener types\nconst CAPTURE = 1\nconst BUBBLE = 2\nconst ATTRIBUTE = 3\n\n/**\n * Check whether a given value is an object or not.\n * @param {any} x The value to check.\n * @returns {boolean} `true` if the value is an object.\n */\nfunction isObject(x) {\n    return x !== null && typeof x === \"object\" //eslint-disable-line no-restricted-syntax\n}\n\n/**\n * Get listeners.\n * @param {EventTarget} eventTarget The event target to get.\n * @returns {Map<string, ListenerNode>} The listeners.\n * @private\n */\nfunction getListeners(eventTarget) {\n    const listeners = listenersMap.get(eventTarget)\n    if (listeners == null) {\n        throw new TypeError(\n            \"'this' is expected an EventTarget object, but got another value.\",\n        )\n    }\n    return listeners\n}\n\n/**\n * Get the property descriptor for the event attribute of a given event.\n * @param {string} eventName The event name to get property descriptor.\n * @returns {PropertyDescriptor} The property descriptor.\n * @private\n */\nfunction defineEventAttributeDescriptor(eventName) {\n    return {\n        get() {\n            const listeners = getListeners(this)\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    return node.listener\n                }\n                node = node.next\n            }\n            return null\n        },\n\n        set(listener) {\n            if (typeof listener !== \"function\" && !isObject(listener)) {\n                listener = null // eslint-disable-line no-param-reassign\n            }\n            const listeners = getListeners(this)\n\n            // Traverse to the tail while removing old value.\n            let prev = null\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    // Remove old value.\n                    if (prev !== null) {\n                        prev.next = node.next\n                    } else if (node.next !== null) {\n                        listeners.set(eventName, node.next)\n                    } else {\n                        listeners.delete(eventName)\n                    }\n                } else {\n                    prev = node\n                }\n\n                node = node.next\n            }\n\n            // Add new value.\n            if (listener !== null) {\n                const newNode = {\n                    listener,\n                    listenerType: ATTRIBUTE,\n                    passive: false,\n                    once: false,\n                    next: null,\n                }\n                if (prev === null) {\n                    listeners.set(eventName, newNode)\n                } else {\n                    prev.next = newNode\n                }\n            }\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define an event attribute (e.g. `eventTarget.onclick`).\n * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.\n * @param {string} eventName The event name to define.\n * @returns {void}\n */\nfunction defineEventAttribute(eventTargetPrototype, eventName) {\n    Object.defineProperty(\n        eventTargetPrototype,\n        `on${eventName}`,\n        defineEventAttributeDescriptor(eventName),\n    )\n}\n\n/**\n * Define a custom EventTarget with event attributes.\n * @param {string[]} eventNames Event names for event attributes.\n * @returns {EventTarget} The custom EventTarget.\n * @private\n */\nfunction defineCustomEventTarget(eventNames) {\n    /** CustomEventTarget */\n    function CustomEventTarget() {\n        EventTarget.call(this)\n    }\n\n    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {\n        constructor: {\n            value: CustomEventTarget,\n            configurable: true,\n            writable: true,\n        },\n    })\n\n    for (let i = 0; i < eventNames.length; ++i) {\n        defineEventAttribute(CustomEventTarget.prototype, eventNames[i])\n    }\n\n    return CustomEventTarget\n}\n\n/**\n * EventTarget.\n *\n * - This is constructor if no arguments.\n * - This is a function which returns a CustomEventTarget constructor if there are arguments.\n *\n * For example:\n *\n *     class A extends EventTarget {}\n *     class B extends EventTarget(\"message\") {}\n *     class C extends EventTarget(\"message\", \"error\") {}\n *     class D extends EventTarget([\"message\", \"error\"]) {}\n */\nfunction EventTarget() {\n    /*eslint-disable consistent-return */\n    if (this instanceof EventTarget) {\n        listenersMap.set(this, new Map())\n        return\n    }\n    if (arguments.length === 1 && Array.isArray(arguments[0])) {\n        return defineCustomEventTarget(arguments[0])\n    }\n    if (arguments.length > 0) {\n        const types = new Array(arguments.length)\n        for (let i = 0; i < arguments.length; ++i) {\n            types[i] = arguments[i]\n        }\n        return defineCustomEventTarget(types)\n    }\n    throw new TypeError(\"Cannot call a class as a function\")\n    /*eslint-enable consistent-return */\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEventTarget.prototype = {\n    /**\n     * Add a given listener to this event target.\n     * @param {string} eventName The event name to add.\n     * @param {Function} listener The listener to add.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    addEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n        if (typeof listener !== \"function\" && !isObject(listener)) {\n            throw new TypeError(\"'listener' should be a function or an object.\")\n        }\n\n        const listeners = getListeners(this)\n        const optionsIsObj = isObject(options)\n        const capture = optionsIsObj\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n        const newNode = {\n            listener,\n            listenerType,\n            passive: optionsIsObj && Boolean(options.passive),\n            once: optionsIsObj && Boolean(options.once),\n            next: null,\n        }\n\n        // Set it as the first node if the first node is null.\n        let node = listeners.get(eventName)\n        if (node === undefined) {\n            listeners.set(eventName, newNode)\n            return\n        }\n\n        // Traverse to the tail while checking duplication..\n        let prev = null\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                // Should ignore duplication.\n                return\n            }\n            prev = node\n            node = node.next\n        }\n\n        // Add it.\n        prev.next = newNode\n    },\n\n    /**\n     * Remove a given listener from this event target.\n     * @param {string} eventName The event name to remove.\n     * @param {Function} listener The listener to remove.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    removeEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n\n        const listeners = getListeners(this)\n        const capture = isObject(options)\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n\n        let prev = null\n        let node = listeners.get(eventName)\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n                return\n            }\n\n            prev = node\n            node = node.next\n        }\n    },\n\n    /**\n     * Dispatch a given event.\n     * @param {Event|{type:string}} event The event to dispatch.\n     * @returns {boolean} `false` if canceled.\n     */\n    dispatchEvent(event) {\n        if (event == null || typeof event.type !== \"string\") {\n            throw new TypeError('\"event.type\" should be a string.')\n        }\n\n        // If listeners aren't registered, terminate.\n        const listeners = getListeners(this)\n        const eventName = event.type\n        let node = listeners.get(eventName)\n        if (node == null) {\n            return true\n        }\n\n        // Since we cannot rewrite several properties, so wrap object.\n        const wrappedEvent = wrapEvent(this, event)\n\n        // This doesn't process capturing phase and bubbling phase.\n        // This isn't participating in a tree.\n        let prev = null\n        while (node != null) {\n            // Remove this listener if it's once\n            if (node.once) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n            } else {\n                prev = node\n            }\n\n            // Call this listener\n            setPassiveListener(\n                wrappedEvent,\n                node.passive ? node.listener : null,\n            )\n            if (typeof node.listener === \"function\") {\n                try {\n                    node.listener.call(this, wrappedEvent)\n                } catch (err) {\n                    if (\n                        typeof console !== \"undefined\" &&\n                        typeof console.error === \"function\"\n                    ) {\n                        console.error(err)\n                    }\n                }\n            } else if (\n                node.listenerType !== ATTRIBUTE &&\n                typeof node.listener.handleEvent === \"function\"\n            ) {\n                node.listener.handleEvent(wrappedEvent)\n            }\n\n            // Break if `event.stopImmediatePropagation` was called.\n            if (isStopped(wrappedEvent)) {\n                break\n            }\n\n            node = node.next\n        }\n        setPassiveListener(wrappedEvent, null)\n        setEventPhase(wrappedEvent, 0)\n        setCurrentTarget(wrappedEvent, null)\n\n        return !wrappedEvent.defaultPrevented\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(EventTarget.prototype, \"constructor\", {\n    value: EventTarget,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `eventTarget instanceof window.EventTarget` is `true`.\nif (\n    typeof window !== \"undefined\" &&\n    typeof window.EventTarget !== \"undefined\"\n) {\n    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype)\n}\n\nexport { defineEventAttribute, EventTarget }\nexport default 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+{"version":3,"file":"event-target-shim.mjs.map","sources":["../src/event.mjs","../src/event-target.mjs"],"sourcesContent":["/**\n * @typedef {object} PrivateData\n * @property {EventTarget} eventTarget The event target.\n * @property {{type:string}} event The original event object.\n * @property {number} eventPhase The current event phase.\n * @property {EventTarget|null} currentTarget The current event target.\n * @property {boolean} canceled The flag to prevent default.\n * @property {boolean} stopped The flag to stop propagation.\n * @property {boolean} immediateStopped The flag to stop propagation immediately.\n * @property {Function|null} passiveListener The listener if the current listener is passive. 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i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in this)) {\n            Object.defineProperty(this, key, defineRedirectDescriptor(key))\n        }\n    }\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEvent.prototype = {\n    /**\n     * The type of this event.\n     * @type {string}\n     */\n    get type() {\n        return pd(this).event.type\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get target() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get currentTarget() {\n        return pd(this).currentTarget\n    },\n\n    /**\n     * @returns {EventTarget[]} The composed path of this event.\n     */\n    composedPath() {\n        const currentTarget = pd(this).currentTarget\n        if (currentTarget == null) {\n            return []\n        }\n        return [currentTarget]\n    },\n\n    /**\n     * Constant of NONE.\n     * @type {number}\n     */\n    get NONE() {\n        return 0\n    },\n\n    /**\n     * Constant of CAPTURING_PHASE.\n     * @type {number}\n     */\n    get CAPTURING_PHASE() {\n        return 1\n    },\n\n    /**\n     * Constant of AT_TARGET.\n     * @type {number}\n     */\n    get AT_TARGET() {\n        return 2\n    },\n\n    /**\n     * Constant of BUBBLING_PHASE.\n     * @type {number}\n     */\n    get BUBBLING_PHASE() {\n        return 3\n    },\n\n    /**\n     * The target of this event.\n     * @type {number}\n     */\n    get eventPhase() {\n        return pd(this).eventPhase\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopPropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.stopPropagation === \"function\") {\n            data.event.stopPropagation()\n        }\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopImmediatePropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        data.immediateStopped = true\n        if (typeof data.event.stopImmediatePropagation === \"function\") {\n            data.event.stopImmediatePropagation()\n        }\n    },\n\n    /**\n     * The flag to be bubbling.\n     * @type {boolean}\n     */\n    get bubbles() {\n        return Boolean(pd(this).event.bubbles)\n    },\n\n    /**\n     * The flag to be cancelable.\n     * @type {boolean}\n     */\n    get cancelable() {\n        return Boolean(pd(this).event.cancelable)\n    },\n\n    /**\n     * Cancel this event.\n     * @returns {void}\n     */\n    preventDefault() {\n        setCancelFlag(pd(this))\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     */\n    get defaultPrevented() {\n        return pd(this).canceled\n    },\n\n    /**\n     * The flag to be composed.\n     * @type {boolean}\n     */\n    get composed() {\n        return Boolean(pd(this).event.composed)\n    },\n\n    /**\n     * The unix time of this event.\n     * @type {number}\n     */\n    get timeStamp() {\n        return pd(this).timeStamp\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     * @deprecated\n     */\n    get srcElement() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The flag to stop event bubbling.\n     * @type {boolean}\n     * @deprecated\n     */\n    get cancelBubble() {\n        return pd(this).stopped\n    },\n    set cancelBubble(value) {\n        if (!value) {\n            return\n        }\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.cancelBubble === \"boolean\") {\n            data.event.cancelBubble = true\n        }\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     * @deprecated\n     */\n    get returnValue() {\n        return !pd(this).canceled\n    },\n    set returnValue(value) {\n        if (!value) {\n            setCancelFlag(pd(this))\n        }\n    },\n\n    /**\n     * Initialize this event object. But do nothing under event dispatching.\n     * @param {string} type The event type.\n     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.\n     * @param {boolean} [cancelable=false] The flag to be possible to cancel.\n     * @deprecated\n     */\n    initEvent() {\n        // Do nothing.\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(Event.prototype, \"constructor\", {\n    value: Event,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `event instanceof window.Event` is `true`.\nif (typeof window !== \"undefined\" && typeof window.Event !== \"undefined\") {\n    Object.setPrototypeOf(Event.prototype, window.Event.prototype)\n\n    // Make association for wrappers.\n    wrappers.set(window.Event.prototype, Event)\n}\n\n/**\n * Get the property descriptor to redirect a given property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to redirect the property.\n * @private\n */\nfunction defineRedirectDescriptor(key) {\n    return {\n        get() {\n            return pd(this).event[key]\n        },\n        set(value) {\n            pd(this).event[key] = value\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Get the property descriptor to call a given method property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to call the method property.\n * @private\n */\nfunction defineCallDescriptor(key) {\n    return {\n        value() {\n            const event = pd(this).event\n            return event[key].apply(event, arguments)\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define new wrapper class.\n * @param {Function} BaseEvent The base wrapper class.\n * @param {Object} proto The prototype of the original event.\n * @returns {Function} The defined wrapper class.\n * @private\n */\nfunction defineWrapper(BaseEvent, proto) {\n    const keys = Object.keys(proto)\n    if (keys.length === 0) {\n        return BaseEvent\n    }\n\n    /** CustomEvent */\n    function CustomEvent(eventTarget, event) {\n        BaseEvent.call(this, eventTarget, event)\n    }\n\n    CustomEvent.prototype = Object.create(BaseEvent.prototype, {\n        constructor: { value: CustomEvent, configurable: true, writable: true },\n    })\n\n    // Define accessors.\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in BaseEvent.prototype)) {\n            const descriptor = Object.getOwnPropertyDescriptor(proto, key)\n            const isFunc = typeof descriptor.value === \"function\"\n            Object.defineProperty(\n                CustomEvent.prototype,\n                key,\n                isFunc\n                    ? defineCallDescriptor(key)\n                    : defineRedirectDescriptor(key)\n            )\n        }\n    }\n\n    return CustomEvent\n}\n\n/**\n * Get the wrapper class of a given prototype.\n * @param {Object} proto The prototype of the original event to get its wrapper.\n * @returns {Function} The wrapper class.\n * @private\n */\nfunction getWrapper(proto) {\n    if (proto == null || proto === Object.prototype) {\n        return Event\n    }\n\n    let wrapper = wrappers.get(proto)\n    if (wrapper == null) {\n        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto)\n        wrappers.set(proto, wrapper)\n    }\n    return wrapper\n}\n\n/**\n * Wrap a given event to management a dispatching.\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Object} event The event to wrap.\n * @returns {Event} The wrapper instance.\n * @private\n */\nexport function wrapEvent(eventTarget, event) {\n    const Wrapper = getWrapper(Object.getPrototypeOf(event))\n    return new Wrapper(eventTarget, event)\n}\n\n/**\n * Get the immediateStopped flag of a given event.\n * @param {Event} event The event to get.\n * @returns {boolean} The flag to stop propagation immediately.\n * @private\n */\nexport function isStopped(event) {\n    return pd(event).immediateStopped\n}\n\n/**\n * Set the current event phase of a given event.\n * @param {Event} event The event to set current target.\n * @param {number} eventPhase New event phase.\n * @returns {void}\n * @private\n */\nexport function setEventPhase(event, eventPhase) {\n    pd(event).eventPhase = eventPhase\n}\n\n/**\n * Set the current target of a given event.\n * @param {Event} event The event to set current target.\n * @param {EventTarget|null} currentTarget New current target.\n * @returns {void}\n * @private\n */\nexport function setCurrentTarget(event, currentTarget) {\n    pd(event).currentTarget = currentTarget\n}\n\n/**\n * Set a passive listener of a given event.\n * @param {Event} event The event to set current target.\n * @param {Function|null} passiveListener New passive listener.\n * @returns {void}\n * @private\n */\nexport function setPassiveListener(event, passiveListener) {\n    pd(event).passiveListener = passiveListener\n}\n","import {\n    isStopped,\n    setCurrentTarget,\n    setEventPhase,\n    setPassiveListener,\n    wrapEvent,\n} from \"./event.mjs\"\n\n/**\n * @typedef {object} ListenerNode\n * @property {Function} listener\n * @property {1|2|3} listenerType\n * @property {boolean} passive\n * @property {boolean} once\n * @property {ListenerNode|null} next\n * @private\n */\n\n/**\n * @type {WeakMap<object, Map<string, ListenerNode>>}\n * @private\n */\nconst listenersMap = new WeakMap()\n\n// Listener types\nconst CAPTURE = 1\nconst BUBBLE = 2\nconst ATTRIBUTE = 3\n\n/**\n * Check whether a given value is an object or not.\n * @param {any} x The value to check.\n * @returns {boolean} `true` if the value is an object.\n */\nfunction isObject(x) {\n    return x !== null && typeof x === \"object\" //eslint-disable-line no-restricted-syntax\n}\n\n/**\n * Get listeners.\n * @param {EventTarget} eventTarget The event target to get.\n * @returns {Map<string, ListenerNode>} The listeners.\n * @private\n */\nfunction getListeners(eventTarget) {\n    const listeners = listenersMap.get(eventTarget)\n    if (listeners == null) {\n        throw new TypeError(\n            \"'this' is expected an EventTarget object, but got another value.\"\n        )\n    }\n    return listeners\n}\n\n/**\n * Get the property descriptor for the event attribute of a given event.\n * @param {string} eventName The event name to get property descriptor.\n * @returns {PropertyDescriptor} The property descriptor.\n * @private\n */\nfunction defineEventAttributeDescriptor(eventName) {\n    return {\n        get() {\n            const listeners = getListeners(this)\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    return node.listener\n                }\n                node = node.next\n            }\n            return null\n        },\n\n        set(listener) {\n            if (typeof listener !== \"function\" && !isObject(listener)) {\n                listener = null // eslint-disable-line no-param-reassign\n            }\n            const listeners = getListeners(this)\n\n            // Traverse to the tail while removing old value.\n            let prev = null\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    // Remove old value.\n                    if (prev !== null) {\n                        prev.next = node.next\n                    } else if (node.next !== null) {\n                        listeners.set(eventName, node.next)\n                    } else {\n                        listeners.delete(eventName)\n                    }\n                } else {\n                    prev = node\n                }\n\n                node = node.next\n            }\n\n            // Add new value.\n            if (listener !== null) {\n                const newNode = {\n                    listener,\n                    listenerType: ATTRIBUTE,\n                    passive: false,\n                    once: false,\n                    next: null,\n                }\n                if (prev === null) {\n                    listeners.set(eventName, newNode)\n                } else {\n                    prev.next = newNode\n                }\n            }\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define an event attribute (e.g. `eventTarget.onclick`).\n * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.\n * @param {string} eventName The event name to define.\n * @returns {void}\n */\nfunction defineEventAttribute(eventTargetPrototype, eventName) {\n    Object.defineProperty(\n        eventTargetPrototype,\n        `on${eventName}`,\n        defineEventAttributeDescriptor(eventName)\n    )\n}\n\n/**\n * Define a custom EventTarget with event attributes.\n * @param {string[]} eventNames Event names for event attributes.\n * @returns {EventTarget} The custom EventTarget.\n * @private\n */\nfunction defineCustomEventTarget(eventNames) {\n    /** CustomEventTarget */\n    function CustomEventTarget() {\n        EventTarget.call(this)\n    }\n\n    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {\n        constructor: {\n            value: CustomEventTarget,\n            configurable: true,\n            writable: true,\n        },\n    })\n\n    for (let i = 0; i < eventNames.length; ++i) {\n        defineEventAttribute(CustomEventTarget.prototype, eventNames[i])\n    }\n\n    return CustomEventTarget\n}\n\n/**\n * EventTarget.\n *\n * - This is constructor if no arguments.\n * - This is a function which returns a CustomEventTarget constructor if there are arguments.\n *\n * For example:\n *\n *     class A extends EventTarget {}\n *     class B extends EventTarget(\"message\") {}\n *     class C extends EventTarget(\"message\", \"error\") {}\n *     class D extends EventTarget([\"message\", \"error\"]) {}\n */\nfunction EventTarget() {\n    /*eslint-disable consistent-return */\n    if (this instanceof EventTarget) {\n        listenersMap.set(this, new Map())\n        return\n    }\n    if (arguments.length === 1 && Array.isArray(arguments[0])) {\n        return defineCustomEventTarget(arguments[0])\n    }\n    if (arguments.length > 0) {\n        const types = new Array(arguments.length)\n        for (let i = 0; i < arguments.length; ++i) {\n            types[i] = arguments[i]\n        }\n        return defineCustomEventTarget(types)\n    }\n    throw new TypeError(\"Cannot call a class as a function\")\n    /*eslint-enable consistent-return */\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEventTarget.prototype = {\n    /**\n     * Add a given listener to this event target.\n     * @param {string} eventName The event name to add.\n     * @param {Function} listener The listener to add.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    addEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n        if (typeof listener !== \"function\" && !isObject(listener)) {\n            throw new TypeError(\"'listener' should be a function or an object.\")\n        }\n\n        const listeners = getListeners(this)\n        const optionsIsObj = isObject(options)\n        const capture = optionsIsObj\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n        const newNode = {\n            listener,\n            listenerType,\n            passive: optionsIsObj && Boolean(options.passive),\n            once: optionsIsObj && Boolean(options.once),\n            next: null,\n        }\n\n        // Set it as the first node if the first node is null.\n        let node = listeners.get(eventName)\n        if (node === undefined) {\n            listeners.set(eventName, newNode)\n            return\n        }\n\n        // Traverse to the tail while checking duplication..\n        let prev = null\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                // Should ignore duplication.\n                return\n            }\n            prev = node\n            node = node.next\n        }\n\n        // Add it.\n        prev.next = newNode\n    },\n\n    /**\n     * Remove a given listener from this event target.\n     * @param {string} eventName The event name to remove.\n     * @param {Function} listener The listener to remove.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    removeEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n\n        const listeners = getListeners(this)\n        const capture = isObject(options)\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n\n        let prev = null\n        let node = listeners.get(eventName)\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n                return\n            }\n\n            prev = node\n            node = node.next\n        }\n    },\n\n    /**\n     * Dispatch a given event.\n     * @param {Event|{type:string}} event The event to dispatch.\n     * @returns {boolean} `false` if canceled.\n     */\n    dispatchEvent(event) {\n        if (event == null || typeof event.type !== \"string\") {\n            throw new TypeError('\"event.type\" should be a string.')\n        }\n\n        // If listeners aren't registered, terminate.\n        const listeners = getListeners(this)\n        const eventName = event.type\n        let node = listeners.get(eventName)\n        if (node == null) {\n            return true\n        }\n\n        // Since we cannot rewrite several properties, so wrap object.\n        const wrappedEvent = wrapEvent(this, event)\n\n        // This doesn't process capturing phase and bubbling phase.\n        // This isn't participating in a tree.\n        let prev = null\n        while (node != null) {\n            // Remove this listener if it's once\n            if (node.once) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n            } else {\n                prev = node\n            }\n\n            // Call this listener\n            setPassiveListener(\n                wrappedEvent,\n                node.passive ? node.listener : null\n            )\n            if (typeof node.listener === \"function\") {\n                try {\n                    node.listener.call(this, wrappedEvent)\n                } catch (err) {\n                    if (\n                        typeof console !== \"undefined\" &&\n                        typeof console.error === \"function\"\n                    ) {\n                        console.error(err)\n                    }\n                }\n            } else if (\n                node.listenerType !== ATTRIBUTE &&\n                typeof node.listener.handleEvent === \"function\"\n            ) {\n                node.listener.handleEvent(wrappedEvent)\n            }\n\n            // Break if `event.stopImmediatePropagation` was called.\n            if (isStopped(wrappedEvent)) {\n                break\n            }\n\n            node = node.next\n        }\n        setPassiveListener(wrappedEvent, null)\n        setEventPhase(wrappedEvent, 0)\n        setCurrentTarget(wrappedEvent, null)\n\n        return !wrappedEvent.defaultPrevented\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(EventTarget.prototype, \"constructor\", {\n    value: EventTarget,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `eventTarget instanceof window.EventTarget` is `true`.\nif (\n    typeof window !== \"undefined\" &&\n    typeof window.EventTarget !== \"undefined\"\n) {\n    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype)\n}\n\nexport { defineEventAttribute, EventTarget }\nexport default 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\ No newline at end of file
diff --git a/dist/event-target-shim.umd.js.map b/dist/event-target-shim.umd.js.map
index c46b086..0f6f1be 100644
--- a/dist/event-target-shim.umd.js.map
+++ b/dist/event-target-shim.umd.js.map
@@ -1 +1 @@
-{"version":3,"file":"event-target-shim.umd.js.map","sources":["../src/event.mjs","../src/event-target.mjs"],"sourcesContent":["/**\n * @typedef {object} PrivateData\n * @property {EventTarget} eventTarget The event target.\n * @property {{type:string}} event The original event object.\n * @property {number} eventPhase The current event phase.\n * @property {EventTarget|null} currentTarget The current event target.\n * @property {boolean} canceled The flag to prevent default.\n * @property {boolean} stopped The flag to stop propagation.\n * @property {boolean} immediateStopped The flag to stop propagation immediately.\n * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.\n * @property {number} timeStamp The unix time.\n * @private\n */\n\n/**\n * Private data for event wrappers.\n * @type {WeakMap<Event, PrivateData>}\n * @private\n */\nconst privateData = new WeakMap()\n\n/**\n * Cache for wrapper classes.\n * @type {WeakMap<Object, Function>}\n * @private\n */\nconst wrappers = new WeakMap()\n\n/**\n * Get private data.\n * @param {Event} event The event object to get private data.\n * @returns {PrivateData} The private data of the event.\n * @private\n */\nfunction pd(event) {\n    const retv = privateData.get(event)\n    console.assert(\n        retv != null,\n        \"'this' is expected an Event object, but got\",\n        event,\n    )\n    return retv\n}\n\n/**\n * https://dom.spec.whatwg.org/#set-the-canceled-flag\n * @param data {PrivateData} private data.\n */\nfunction setCancelFlag(data) {\n    if (data.passiveListener != null) {\n        if (\n            typeof console !== \"undefined\" &&\n            typeof console.error === \"function\"\n        ) {\n            console.error(\n                \"Unable to preventDefault inside passive event listener invocation.\",\n                data.passiveListener,\n            )\n        }\n        return\n    }\n    if (!data.event.cancelable) {\n        return\n    }\n\n    data.canceled = true\n    if (typeof data.event.preventDefault === \"function\") {\n        data.event.preventDefault()\n    }\n}\n\n/**\n * @see https://dom.spec.whatwg.org/#interface-event\n * @private\n */\n/**\n * The event wrapper.\n * @constructor\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Event|{type:string}} event The original event to wrap.\n */\nfunction Event(eventTarget, event) {\n    privateData.set(this, {\n        eventTarget,\n        event,\n        eventPhase: 2,\n        currentTarget: eventTarget,\n        canceled: false,\n        stopped: false,\n        immediateStopped: false,\n        passiveListener: null,\n        timeStamp: event.timeStamp || Date.now(),\n    })\n\n    // https://heycam.github.io/webidl/#Unforgeable\n    Object.defineProperty(this, \"isTrusted\", { value: false, enumerable: true })\n\n    // Define accessors\n    const keys = Object.keys(event)\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in this)) {\n            Object.defineProperty(this, key, defineRedirectDescriptor(key))\n        }\n    }\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEvent.prototype = {\n    /**\n     * The type of this event.\n     * @type {string}\n     */\n    get type() {\n        return pd(this).event.type\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get target() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get currentTarget() {\n        return pd(this).currentTarget\n    },\n\n    /**\n     * @returns {EventTarget[]} The composed path of this event.\n     */\n    composedPath() {\n        const currentTarget = pd(this).currentTarget\n        if (currentTarget == null) {\n            return []\n        }\n        return [currentTarget]\n    },\n\n    /**\n     * Constant of NONE.\n     * @type {number}\n     */\n    get NONE() {\n        return 0\n    },\n\n    /**\n     * Constant of CAPTURING_PHASE.\n     * @type {number}\n     */\n    get CAPTURING_PHASE() {\n        return 1\n    },\n\n    /**\n     * Constant of AT_TARGET.\n     * @type {number}\n     */\n    get AT_TARGET() {\n        return 2\n    },\n\n    /**\n     * Constant of BUBBLING_PHASE.\n     * @type {number}\n     */\n    get BUBBLING_PHASE() {\n        return 3\n    },\n\n    /**\n     * The target of this event.\n     * @type {number}\n     */\n    get eventPhase() {\n        return pd(this).eventPhase\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopPropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.stopPropagation === \"function\") {\n            data.event.stopPropagation()\n        }\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopImmediatePropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        data.immediateStopped = true\n        if (typeof data.event.stopImmediatePropagation === \"function\") {\n            data.event.stopImmediatePropagation()\n        }\n    },\n\n    /**\n     * The flag to be bubbling.\n     * @type {boolean}\n     */\n    get bubbles() {\n        return Boolean(pd(this).event.bubbles)\n    },\n\n    /**\n     * The flag to be cancelable.\n     * @type {boolean}\n     */\n    get cancelable() {\n        return Boolean(pd(this).event.cancelable)\n    },\n\n    /**\n     * Cancel this event.\n     * @returns {void}\n     */\n    preventDefault() {\n        setCancelFlag(pd(this))\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     */\n    get defaultPrevented() {\n        return pd(this).canceled\n    },\n\n    /**\n     * The flag to be composed.\n     * @type {boolean}\n     */\n    get composed() {\n        return Boolean(pd(this).event.composed)\n    },\n\n    /**\n     * The unix time of this event.\n     * @type {number}\n     */\n    get timeStamp() {\n        return pd(this).timeStamp\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     * @deprecated\n     */\n    get srcElement() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The flag to stop event bubbling.\n     * @type {boolean}\n     * @deprecated\n     */\n    get cancelBubble() {\n        return pd(this).stopped\n    },\n    set cancelBubble(value) {\n        if (!value) {\n            return\n        }\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.cancelBubble === \"boolean\") {\n            data.event.cancelBubble = true\n        }\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     * @deprecated\n     */\n    get returnValue() {\n        return !pd(this).canceled\n    },\n    set returnValue(value) {\n        if (!value) {\n            setCancelFlag(pd(this))\n        }\n    },\n\n    /**\n     * Initialize this event object. But do nothing under event dispatching.\n     * @param {string} type The event type.\n     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.\n     * @param {boolean} [cancelable=false] The flag to be possible to cancel.\n     * @deprecated\n     */\n    initEvent() {\n        // Do nothing.\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(Event.prototype, \"constructor\", {\n    value: Event,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `event instanceof window.Event` is `true`.\nif (typeof window !== \"undefined\" && typeof window.Event !== \"undefined\") {\n    Object.setPrototypeOf(Event.prototype, window.Event.prototype)\n\n    // Make association for wrappers.\n    wrappers.set(window.Event.prototype, Event)\n}\n\n/**\n * Get the property descriptor to redirect a given property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to redirect the property.\n * @private\n */\nfunction defineRedirectDescriptor(key) {\n    return {\n        get() {\n            return pd(this).event[key]\n        },\n        set(value) {\n            pd(this).event[key] = value\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Get the property descriptor to call a given method property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to call the method property.\n * @private\n */\nfunction defineCallDescriptor(key) {\n    return {\n        value() {\n            const event = pd(this).event\n            return event[key].apply(event, arguments)\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define new wrapper class.\n * @param {Function} BaseEvent The base wrapper class.\n * @param {Object} proto The prototype of the original event.\n * @returns {Function} The defined wrapper class.\n * @private\n */\nfunction defineWrapper(BaseEvent, proto) {\n    const keys = Object.keys(proto)\n    if (keys.length === 0) {\n        return BaseEvent\n    }\n\n    /** CustomEvent */\n    function CustomEvent(eventTarget, event) {\n        BaseEvent.call(this, eventTarget, event)\n    }\n\n    CustomEvent.prototype = Object.create(BaseEvent.prototype, {\n        constructor: { value: CustomEvent, configurable: true, writable: true },\n    })\n\n    // Define accessors.\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in BaseEvent.prototype)) {\n            const descriptor = Object.getOwnPropertyDescriptor(proto, key)\n            const isFunc = typeof descriptor.value === \"function\"\n            Object.defineProperty(\n                CustomEvent.prototype,\n                key,\n                isFunc\n                    ? defineCallDescriptor(key)\n                    : defineRedirectDescriptor(key),\n            )\n        }\n    }\n\n    return CustomEvent\n}\n\n/**\n * Get the wrapper class of a given prototype.\n * @param {Object} proto The prototype of the original event to get its wrapper.\n * @returns {Function} The wrapper class.\n * @private\n */\nfunction getWrapper(proto) {\n    if (proto == null || proto === Object.prototype) {\n        return Event\n    }\n\n    let wrapper = wrappers.get(proto)\n    if (wrapper == null) {\n        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto)\n        wrappers.set(proto, wrapper)\n    }\n    return wrapper\n}\n\n/**\n * Wrap a given event to management a dispatching.\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Object} event The event to wrap.\n * @returns {Event} The wrapper instance.\n * @private\n */\nexport function wrapEvent(eventTarget, event) {\n    const Wrapper = getWrapper(Object.getPrototypeOf(event))\n    return new Wrapper(eventTarget, event)\n}\n\n/**\n * Get the immediateStopped flag of a given event.\n * @param {Event} event The event to get.\n * @returns {boolean} The flag to stop propagation immediately.\n * @private\n */\nexport function isStopped(event) {\n    return pd(event).immediateStopped\n}\n\n/**\n * Set the current event phase of a given event.\n * @param {Event} event The event to set current target.\n * @param {number} eventPhase New event phase.\n * @returns {void}\n * @private\n */\nexport function setEventPhase(event, eventPhase) {\n    pd(event).eventPhase = eventPhase\n}\n\n/**\n * Set the current target of a given event.\n * @param {Event} event The event to set current target.\n * @param {EventTarget|null} currentTarget New current target.\n * @returns {void}\n * @private\n */\nexport function setCurrentTarget(event, currentTarget) {\n    pd(event).currentTarget = currentTarget\n}\n\n/**\n * Set a passive listener of a given event.\n * @param {Event} event The event to set current target.\n * @param {Function|null} passiveListener New passive listener.\n * @returns {void}\n * @private\n */\nexport function setPassiveListener(event, passiveListener) {\n    pd(event).passiveListener = passiveListener\n}\n","import {\n    isStopped,\n    setCurrentTarget,\n    setEventPhase,\n    setPassiveListener,\n    wrapEvent,\n} from \"./event.mjs\"\n\n/**\n * @typedef {object} ListenerNode\n * @property {Function} listener\n * @property {1|2|3} listenerType\n * @property {boolean} passive\n * @property {boolean} once\n * @property {ListenerNode|null} next\n * @private\n */\n\n/**\n * @type {WeakMap<object, Map<string, ListenerNode>>}\n * @private\n */\nconst listenersMap = new WeakMap()\n\n// Listener types\nconst CAPTURE = 1\nconst BUBBLE = 2\nconst ATTRIBUTE = 3\n\n/**\n * Check whether a given value is an object or not.\n * @param {any} x The value to check.\n * @returns {boolean} `true` if the value is an object.\n */\nfunction isObject(x) {\n    return x !== null && typeof x === \"object\" //eslint-disable-line no-restricted-syntax\n}\n\n/**\n * Get listeners.\n * @param {EventTarget} eventTarget The event target to get.\n * @returns {Map<string, ListenerNode>} The listeners.\n * @private\n */\nfunction getListeners(eventTarget) {\n    const listeners = listenersMap.get(eventTarget)\n    if (listeners == null) {\n        throw new TypeError(\n            \"'this' is expected an EventTarget object, but got another value.\",\n        )\n    }\n    return listeners\n}\n\n/**\n * Get the property descriptor for the event attribute of a given event.\n * @param {string} eventName The event name to get property descriptor.\n * @returns {PropertyDescriptor} The property descriptor.\n * @private\n */\nfunction defineEventAttributeDescriptor(eventName) {\n    return {\n        get() {\n            const listeners = getListeners(this)\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    return node.listener\n                }\n                node = node.next\n            }\n            return null\n        },\n\n        set(listener) {\n            if (typeof listener !== \"function\" && !isObject(listener)) {\n                listener = null // eslint-disable-line no-param-reassign\n            }\n            const listeners = getListeners(this)\n\n            // Traverse to the tail while removing old value.\n            let prev = null\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    // Remove old value.\n                    if (prev !== null) {\n                        prev.next = node.next\n                    } else if (node.next !== null) {\n                        listeners.set(eventName, node.next)\n                    } else {\n                        listeners.delete(eventName)\n                    }\n                } else {\n                    prev = node\n                }\n\n                node = node.next\n            }\n\n            // Add new value.\n            if (listener !== null) {\n                const newNode = {\n                    listener,\n                    listenerType: ATTRIBUTE,\n                    passive: false,\n                    once: false,\n                    next: null,\n                }\n                if (prev === null) {\n                    listeners.set(eventName, newNode)\n                } else {\n                    prev.next = newNode\n                }\n            }\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define an event attribute (e.g. `eventTarget.onclick`).\n * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.\n * @param {string} eventName The event name to define.\n * @returns {void}\n */\nfunction defineEventAttribute(eventTargetPrototype, eventName) {\n    Object.defineProperty(\n        eventTargetPrototype,\n        `on${eventName}`,\n        defineEventAttributeDescriptor(eventName),\n    )\n}\n\n/**\n * Define a custom EventTarget with event attributes.\n * @param {string[]} eventNames Event names for event attributes.\n * @returns {EventTarget} The custom EventTarget.\n * @private\n */\nfunction defineCustomEventTarget(eventNames) {\n    /** CustomEventTarget */\n    function CustomEventTarget() {\n        EventTarget.call(this)\n    }\n\n    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {\n        constructor: {\n            value: CustomEventTarget,\n            configurable: true,\n            writable: true,\n        },\n    })\n\n    for (let i = 0; i < eventNames.length; ++i) {\n        defineEventAttribute(CustomEventTarget.prototype, eventNames[i])\n    }\n\n    return CustomEventTarget\n}\n\n/**\n * EventTarget.\n *\n * - This is constructor if no arguments.\n * - This is a function which returns a CustomEventTarget constructor if there are arguments.\n *\n * For example:\n *\n *     class A extends EventTarget {}\n *     class B extends EventTarget(\"message\") {}\n *     class C extends EventTarget(\"message\", \"error\") {}\n *     class D extends EventTarget([\"message\", \"error\"]) {}\n */\nfunction EventTarget() {\n    /*eslint-disable consistent-return */\n    if (this instanceof EventTarget) {\n        listenersMap.set(this, new Map())\n        return\n    }\n    if (arguments.length === 1 && Array.isArray(arguments[0])) {\n        return defineCustomEventTarget(arguments[0])\n    }\n    if (arguments.length > 0) {\n        const types = new Array(arguments.length)\n        for (let i = 0; i < arguments.length; ++i) {\n            types[i] = arguments[i]\n        }\n        return defineCustomEventTarget(types)\n    }\n    throw new TypeError(\"Cannot call a class as a function\")\n    /*eslint-enable consistent-return */\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEventTarget.prototype = {\n    /**\n     * Add a given listener to this event target.\n     * @param {string} eventName The event name to add.\n     * @param {Function} listener The listener to add.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    addEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n        if (typeof listener !== \"function\" && !isObject(listener)) {\n            throw new TypeError(\"'listener' should be a function or an object.\")\n        }\n\n        const listeners = getListeners(this)\n        const optionsIsObj = isObject(options)\n        const capture = optionsIsObj\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n        const newNode = {\n            listener,\n            listenerType,\n            passive: optionsIsObj && Boolean(options.passive),\n            once: optionsIsObj && Boolean(options.once),\n            next: null,\n        }\n\n        // Set it as the first node if the first node is null.\n        let node = listeners.get(eventName)\n        if (node === undefined) {\n            listeners.set(eventName, newNode)\n            return\n        }\n\n        // Traverse to the tail while checking duplication..\n        let prev = null\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                // Should ignore duplication.\n                return\n            }\n            prev = node\n            node = node.next\n        }\n\n        // Add it.\n        prev.next = newNode\n    },\n\n    /**\n     * Remove a given listener from this event target.\n     * @param {string} eventName The event name to remove.\n     * @param {Function} listener The listener to remove.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    removeEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n\n        const listeners = getListeners(this)\n        const capture = isObject(options)\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n\n        let prev = null\n        let node = listeners.get(eventName)\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n                return\n            }\n\n            prev = node\n            node = node.next\n        }\n    },\n\n    /**\n     * Dispatch a given event.\n     * @param {Event|{type:string}} event The event to dispatch.\n     * @returns {boolean} `false` if canceled.\n     */\n    dispatchEvent(event) {\n        if (event == null || typeof event.type !== \"string\") {\n            throw new TypeError('\"event.type\" should be a string.')\n        }\n\n        // If listeners aren't registered, terminate.\n        const listeners = getListeners(this)\n        const eventName = event.type\n        let node = listeners.get(eventName)\n        if (node == null) {\n            return true\n        }\n\n        // Since we cannot rewrite several properties, so wrap object.\n        const wrappedEvent = wrapEvent(this, event)\n\n        // This doesn't process capturing phase and bubbling phase.\n        // This isn't participating in a tree.\n        let prev = null\n        while (node != null) {\n            // Remove this listener if it's once\n            if (node.once) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n            } else {\n                prev = node\n            }\n\n            // Call this listener\n            setPassiveListener(\n                wrappedEvent,\n                node.passive ? node.listener : null,\n            )\n            if (typeof node.listener === \"function\") {\n                try {\n                    node.listener.call(this, wrappedEvent)\n                } catch (err) {\n                    if (\n                        typeof console !== \"undefined\" &&\n                        typeof console.error === \"function\"\n                    ) {\n                        console.error(err)\n                    }\n                }\n            } else if (\n                node.listenerType !== ATTRIBUTE &&\n                typeof node.listener.handleEvent === \"function\"\n            ) {\n                node.listener.handleEvent(wrappedEvent)\n            }\n\n            // Break if `event.stopImmediatePropagation` was called.\n            if (isStopped(wrappedEvent)) {\n                break\n            }\n\n            node = node.next\n        }\n        setPassiveListener(wrappedEvent, null)\n        setEventPhase(wrappedEvent, 0)\n        setCurrentTarget(wrappedEvent, null)\n\n        return !wrappedEvent.defaultPrevented\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(EventTarget.prototype, \"constructor\", {\n    value: EventTarget,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `eventTarget instanceof window.EventTarget` is `true`.\nif (\n    typeof window !== \"undefined\" &&\n    typeof window.EventTarget !== \"undefined\"\n) {\n    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype)\n}\n\nexport { defineEventAttribute, EventTarget }\nexport default 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+{"version":3,"file":"event-target-shim.umd.js.map","sources":["../src/event.mjs","../src/event-target.mjs"],"sourcesContent":["/**\n * @typedef {object} PrivateData\n * @property {EventTarget} eventTarget The event target.\n * @property {{type:string}} event The original event object.\n * @property {number} eventPhase The current event phase.\n * @property {EventTarget|null} currentTarget The current event target.\n * @property {boolean} canceled The flag to prevent default.\n * @property {boolean} stopped The flag to stop propagation.\n * @property {boolean} immediateStopped The flag to stop propagation immediately.\n * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.\n * @property {number} timeStamp The unix time.\n * @private\n */\n\n/**\n * Private data for event wrappers.\n * @type {WeakMap<Event, PrivateData>}\n * @private\n */\nconst privateData = new WeakMap()\n\n/**\n * Cache for wrapper classes.\n * @type {WeakMap<Object, Function>}\n * @private\n */\nconst wrappers = new WeakMap()\n\n/**\n * Get private data.\n * @param {Event} event The event object to get private data.\n * @returns {PrivateData} The private data of the event.\n * @private\n */\nfunction pd(event) {\n    const retv = privateData.get(event)\n    console.assert(\n        retv != null,\n        \"'this' is expected an Event object, but got\",\n        event\n    )\n    return retv\n}\n\n/**\n * https://dom.spec.whatwg.org/#set-the-canceled-flag\n * @param data {PrivateData} private data.\n */\nfunction setCancelFlag(data) {\n    if (data.passiveListener != null) {\n        if (\n            typeof console !== \"undefined\" &&\n            typeof console.error === \"function\"\n        ) {\n            console.error(\n                \"Unable to preventDefault inside passive event listener invocation.\",\n                data.passiveListener\n            )\n        }\n        return\n    }\n    if (!data.event.cancelable) {\n        return\n    }\n\n    data.canceled = true\n    if (typeof data.event.preventDefault === \"function\") {\n        data.event.preventDefault()\n    }\n}\n\n/**\n * @see https://dom.spec.whatwg.org/#interface-event\n * @private\n */\n/**\n * The event wrapper.\n * @constructor\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Event|{type:string}} event The original event to wrap.\n */\nfunction Event(eventTarget, event) {\n    privateData.set(this, {\n        eventTarget,\n        event,\n        eventPhase: 2,\n        currentTarget: eventTarget,\n        canceled: false,\n        stopped: false,\n        immediateStopped: false,\n        passiveListener: null,\n        timeStamp: event.timeStamp || Date.now(),\n    })\n\n    // https://heycam.github.io/webidl/#Unforgeable\n    Object.defineProperty(this, \"isTrusted\", { value: false, enumerable: true })\n\n    // Define accessors\n    const keys = Object.keys(event)\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in this)) {\n            Object.defineProperty(this, key, defineRedirectDescriptor(key))\n        }\n    }\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEvent.prototype = {\n    /**\n     * The type of this event.\n     * @type {string}\n     */\n    get type() {\n        return pd(this).event.type\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get target() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     */\n    get currentTarget() {\n        return pd(this).currentTarget\n    },\n\n    /**\n     * @returns {EventTarget[]} The composed path of this event.\n     */\n    composedPath() {\n        const currentTarget = pd(this).currentTarget\n        if (currentTarget == null) {\n            return []\n        }\n        return [currentTarget]\n    },\n\n    /**\n     * Constant of NONE.\n     * @type {number}\n     */\n    get NONE() {\n        return 0\n    },\n\n    /**\n     * Constant of CAPTURING_PHASE.\n     * @type {number}\n     */\n    get CAPTURING_PHASE() {\n        return 1\n    },\n\n    /**\n     * Constant of AT_TARGET.\n     * @type {number}\n     */\n    get AT_TARGET() {\n        return 2\n    },\n\n    /**\n     * Constant of BUBBLING_PHASE.\n     * @type {number}\n     */\n    get BUBBLING_PHASE() {\n        return 3\n    },\n\n    /**\n     * The target of this event.\n     * @type {number}\n     */\n    get eventPhase() {\n        return pd(this).eventPhase\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopPropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.stopPropagation === \"function\") {\n            data.event.stopPropagation()\n        }\n    },\n\n    /**\n     * Stop event bubbling.\n     * @returns {void}\n     */\n    stopImmediatePropagation() {\n        const data = pd(this)\n\n        data.stopped = true\n        data.immediateStopped = true\n        if (typeof data.event.stopImmediatePropagation === \"function\") {\n            data.event.stopImmediatePropagation()\n        }\n    },\n\n    /**\n     * The flag to be bubbling.\n     * @type {boolean}\n     */\n    get bubbles() {\n        return Boolean(pd(this).event.bubbles)\n    },\n\n    /**\n     * The flag to be cancelable.\n     * @type {boolean}\n     */\n    get cancelable() {\n        return Boolean(pd(this).event.cancelable)\n    },\n\n    /**\n     * Cancel this event.\n     * @returns {void}\n     */\n    preventDefault() {\n        setCancelFlag(pd(this))\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     */\n    get defaultPrevented() {\n        return pd(this).canceled\n    },\n\n    /**\n     * The flag to be composed.\n     * @type {boolean}\n     */\n    get composed() {\n        return Boolean(pd(this).event.composed)\n    },\n\n    /**\n     * The unix time of this event.\n     * @type {number}\n     */\n    get timeStamp() {\n        return pd(this).timeStamp\n    },\n\n    /**\n     * The target of this event.\n     * @type {EventTarget}\n     * @deprecated\n     */\n    get srcElement() {\n        return pd(this).eventTarget\n    },\n\n    /**\n     * The flag to stop event bubbling.\n     * @type {boolean}\n     * @deprecated\n     */\n    get cancelBubble() {\n        return pd(this).stopped\n    },\n    set cancelBubble(value) {\n        if (!value) {\n            return\n        }\n        const data = pd(this)\n\n        data.stopped = true\n        if (typeof data.event.cancelBubble === \"boolean\") {\n            data.event.cancelBubble = true\n        }\n    },\n\n    /**\n     * The flag to indicate cancellation state.\n     * @type {boolean}\n     * @deprecated\n     */\n    get returnValue() {\n        return !pd(this).canceled\n    },\n    set returnValue(value) {\n        if (!value) {\n            setCancelFlag(pd(this))\n        }\n    },\n\n    /**\n     * Initialize this event object. But do nothing under event dispatching.\n     * @param {string} type The event type.\n     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.\n     * @param {boolean} [cancelable=false] The flag to be possible to cancel.\n     * @deprecated\n     */\n    initEvent() {\n        // Do nothing.\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(Event.prototype, \"constructor\", {\n    value: Event,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `event instanceof window.Event` is `true`.\nif (typeof window !== \"undefined\" && typeof window.Event !== \"undefined\") {\n    Object.setPrototypeOf(Event.prototype, window.Event.prototype)\n\n    // Make association for wrappers.\n    wrappers.set(window.Event.prototype, Event)\n}\n\n/**\n * Get the property descriptor to redirect a given property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to redirect the property.\n * @private\n */\nfunction defineRedirectDescriptor(key) {\n    return {\n        get() {\n            return pd(this).event[key]\n        },\n        set(value) {\n            pd(this).event[key] = value\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Get the property descriptor to call a given method property.\n * @param {string} key Property name to define property descriptor.\n * @returns {PropertyDescriptor} The property descriptor to call the method property.\n * @private\n */\nfunction defineCallDescriptor(key) {\n    return {\n        value() {\n            const event = pd(this).event\n            return event[key].apply(event, arguments)\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define new wrapper class.\n * @param {Function} BaseEvent The base wrapper class.\n * @param {Object} proto The prototype of the original event.\n * @returns {Function} The defined wrapper class.\n * @private\n */\nfunction defineWrapper(BaseEvent, proto) {\n    const keys = Object.keys(proto)\n    if (keys.length === 0) {\n        return BaseEvent\n    }\n\n    /** CustomEvent */\n    function CustomEvent(eventTarget, event) {\n        BaseEvent.call(this, eventTarget, event)\n    }\n\n    CustomEvent.prototype = Object.create(BaseEvent.prototype, {\n        constructor: { value: CustomEvent, configurable: true, writable: true },\n    })\n\n    // Define accessors.\n    for (let i = 0; i < keys.length; ++i) {\n        const key = keys[i]\n        if (!(key in BaseEvent.prototype)) {\n            const descriptor = Object.getOwnPropertyDescriptor(proto, key)\n            const isFunc = typeof descriptor.value === \"function\"\n            Object.defineProperty(\n                CustomEvent.prototype,\n                key,\n                isFunc\n                    ? defineCallDescriptor(key)\n                    : defineRedirectDescriptor(key)\n            )\n        }\n    }\n\n    return CustomEvent\n}\n\n/**\n * Get the wrapper class of a given prototype.\n * @param {Object} proto The prototype of the original event to get its wrapper.\n * @returns {Function} The wrapper class.\n * @private\n */\nfunction getWrapper(proto) {\n    if (proto == null || proto === Object.prototype) {\n        return Event\n    }\n\n    let wrapper = wrappers.get(proto)\n    if (wrapper == null) {\n        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto)\n        wrappers.set(proto, wrapper)\n    }\n    return wrapper\n}\n\n/**\n * Wrap a given event to management a dispatching.\n * @param {EventTarget} eventTarget The event target of this dispatching.\n * @param {Object} event The event to wrap.\n * @returns {Event} The wrapper instance.\n * @private\n */\nexport function wrapEvent(eventTarget, event) {\n    const Wrapper = getWrapper(Object.getPrototypeOf(event))\n    return new Wrapper(eventTarget, event)\n}\n\n/**\n * Get the immediateStopped flag of a given event.\n * @param {Event} event The event to get.\n * @returns {boolean} The flag to stop propagation immediately.\n * @private\n */\nexport function isStopped(event) {\n    return pd(event).immediateStopped\n}\n\n/**\n * Set the current event phase of a given event.\n * @param {Event} event The event to set current target.\n * @param {number} eventPhase New event phase.\n * @returns {void}\n * @private\n */\nexport function setEventPhase(event, eventPhase) {\n    pd(event).eventPhase = eventPhase\n}\n\n/**\n * Set the current target of a given event.\n * @param {Event} event The event to set current target.\n * @param {EventTarget|null} currentTarget New current target.\n * @returns {void}\n * @private\n */\nexport function setCurrentTarget(event, currentTarget) {\n    pd(event).currentTarget = currentTarget\n}\n\n/**\n * Set a passive listener of a given event.\n * @param {Event} event The event to set current target.\n * @param {Function|null} passiveListener New passive listener.\n * @returns {void}\n * @private\n */\nexport function setPassiveListener(event, passiveListener) {\n    pd(event).passiveListener = passiveListener\n}\n","import {\n    isStopped,\n    setCurrentTarget,\n    setEventPhase,\n    setPassiveListener,\n    wrapEvent,\n} from \"./event.mjs\"\n\n/**\n * @typedef {object} ListenerNode\n * @property {Function} listener\n * @property {1|2|3} listenerType\n * @property {boolean} passive\n * @property {boolean} once\n * @property {ListenerNode|null} next\n * @private\n */\n\n/**\n * @type {WeakMap<object, Map<string, ListenerNode>>}\n * @private\n */\nconst listenersMap = new WeakMap()\n\n// Listener types\nconst CAPTURE = 1\nconst BUBBLE = 2\nconst ATTRIBUTE = 3\n\n/**\n * Check whether a given value is an object or not.\n * @param {any} x The value to check.\n * @returns {boolean} `true` if the value is an object.\n */\nfunction isObject(x) {\n    return x !== null && typeof x === \"object\" //eslint-disable-line no-restricted-syntax\n}\n\n/**\n * Get listeners.\n * @param {EventTarget} eventTarget The event target to get.\n * @returns {Map<string, ListenerNode>} The listeners.\n * @private\n */\nfunction getListeners(eventTarget) {\n    const listeners = listenersMap.get(eventTarget)\n    if (listeners == null) {\n        throw new TypeError(\n            \"'this' is expected an EventTarget object, but got another value.\"\n        )\n    }\n    return listeners\n}\n\n/**\n * Get the property descriptor for the event attribute of a given event.\n * @param {string} eventName The event name to get property descriptor.\n * @returns {PropertyDescriptor} The property descriptor.\n * @private\n */\nfunction defineEventAttributeDescriptor(eventName) {\n    return {\n        get() {\n            const listeners = getListeners(this)\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    return node.listener\n                }\n                node = node.next\n            }\n            return null\n        },\n\n        set(listener) {\n            if (typeof listener !== \"function\" && !isObject(listener)) {\n                listener = null // eslint-disable-line no-param-reassign\n            }\n            const listeners = getListeners(this)\n\n            // Traverse to the tail while removing old value.\n            let prev = null\n            let node = listeners.get(eventName)\n            while (node != null) {\n                if (node.listenerType === ATTRIBUTE) {\n                    // Remove old value.\n                    if (prev !== null) {\n                        prev.next = node.next\n                    } else if (node.next !== null) {\n                        listeners.set(eventName, node.next)\n                    } else {\n                        listeners.delete(eventName)\n                    }\n                } else {\n                    prev = node\n                }\n\n                node = node.next\n            }\n\n            // Add new value.\n            if (listener !== null) {\n                const newNode = {\n                    listener,\n                    listenerType: ATTRIBUTE,\n                    passive: false,\n                    once: false,\n                    next: null,\n                }\n                if (prev === null) {\n                    listeners.set(eventName, newNode)\n                } else {\n                    prev.next = newNode\n                }\n            }\n        },\n        configurable: true,\n        enumerable: true,\n    }\n}\n\n/**\n * Define an event attribute (e.g. `eventTarget.onclick`).\n * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.\n * @param {string} eventName The event name to define.\n * @returns {void}\n */\nfunction defineEventAttribute(eventTargetPrototype, eventName) {\n    Object.defineProperty(\n        eventTargetPrototype,\n        `on${eventName}`,\n        defineEventAttributeDescriptor(eventName)\n    )\n}\n\n/**\n * Define a custom EventTarget with event attributes.\n * @param {string[]} eventNames Event names for event attributes.\n * @returns {EventTarget} The custom EventTarget.\n * @private\n */\nfunction defineCustomEventTarget(eventNames) {\n    /** CustomEventTarget */\n    function CustomEventTarget() {\n        EventTarget.call(this)\n    }\n\n    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {\n        constructor: {\n            value: CustomEventTarget,\n            configurable: true,\n            writable: true,\n        },\n    })\n\n    for (let i = 0; i < eventNames.length; ++i) {\n        defineEventAttribute(CustomEventTarget.prototype, eventNames[i])\n    }\n\n    return CustomEventTarget\n}\n\n/**\n * EventTarget.\n *\n * - This is constructor if no arguments.\n * - This is a function which returns a CustomEventTarget constructor if there are arguments.\n *\n * For example:\n *\n *     class A extends EventTarget {}\n *     class B extends EventTarget(\"message\") {}\n *     class C extends EventTarget(\"message\", \"error\") {}\n *     class D extends EventTarget([\"message\", \"error\"]) {}\n */\nfunction EventTarget() {\n    /*eslint-disable consistent-return */\n    if (this instanceof EventTarget) {\n        listenersMap.set(this, new Map())\n        return\n    }\n    if (arguments.length === 1 && Array.isArray(arguments[0])) {\n        return defineCustomEventTarget(arguments[0])\n    }\n    if (arguments.length > 0) {\n        const types = new Array(arguments.length)\n        for (let i = 0; i < arguments.length; ++i) {\n            types[i] = arguments[i]\n        }\n        return defineCustomEventTarget(types)\n    }\n    throw new TypeError(\"Cannot call a class as a function\")\n    /*eslint-enable consistent-return */\n}\n\n// Should be enumerable, but class methods are not enumerable.\nEventTarget.prototype = {\n    /**\n     * Add a given listener to this event target.\n     * @param {string} eventName The event name to add.\n     * @param {Function} listener The listener to add.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    addEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n        if (typeof listener !== \"function\" && !isObject(listener)) {\n            throw new TypeError(\"'listener' should be a function or an object.\")\n        }\n\n        const listeners = getListeners(this)\n        const optionsIsObj = isObject(options)\n        const capture = optionsIsObj\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n        const newNode = {\n            listener,\n            listenerType,\n            passive: optionsIsObj && Boolean(options.passive),\n            once: optionsIsObj && Boolean(options.once),\n            next: null,\n        }\n\n        // Set it as the first node if the first node is null.\n        let node = listeners.get(eventName)\n        if (node === undefined) {\n            listeners.set(eventName, newNode)\n            return\n        }\n\n        // Traverse to the tail while checking duplication..\n        let prev = null\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                // Should ignore duplication.\n                return\n            }\n            prev = node\n            node = node.next\n        }\n\n        // Add it.\n        prev.next = newNode\n    },\n\n    /**\n     * Remove a given listener from this event target.\n     * @param {string} eventName The event name to remove.\n     * @param {Function} listener The listener to remove.\n     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.\n     * @returns {void}\n     */\n    removeEventListener(eventName, listener, options) {\n        if (listener == null) {\n            return\n        }\n\n        const listeners = getListeners(this)\n        const capture = isObject(options)\n            ? Boolean(options.capture)\n            : Boolean(options)\n        const listenerType = capture ? CAPTURE : BUBBLE\n\n        let prev = null\n        let node = listeners.get(eventName)\n        while (node != null) {\n            if (\n                node.listener === listener &&\n                node.listenerType === listenerType\n            ) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n                return\n            }\n\n            prev = node\n            node = node.next\n        }\n    },\n\n    /**\n     * Dispatch a given event.\n     * @param {Event|{type:string}} event The event to dispatch.\n     * @returns {boolean} `false` if canceled.\n     */\n    dispatchEvent(event) {\n        if (event == null || typeof event.type !== \"string\") {\n            throw new TypeError('\"event.type\" should be a string.')\n        }\n\n        // If listeners aren't registered, terminate.\n        const listeners = getListeners(this)\n        const eventName = event.type\n        let node = listeners.get(eventName)\n        if (node == null) {\n            return true\n        }\n\n        // Since we cannot rewrite several properties, so wrap object.\n        const wrappedEvent = wrapEvent(this, event)\n\n        // This doesn't process capturing phase and bubbling phase.\n        // This isn't participating in a tree.\n        let prev = null\n        while (node != null) {\n            // Remove this listener if it's once\n            if (node.once) {\n                if (prev !== null) {\n                    prev.next = node.next\n                } else if (node.next !== null) {\n                    listeners.set(eventName, node.next)\n                } else {\n                    listeners.delete(eventName)\n                }\n            } else {\n                prev = node\n            }\n\n            // Call this listener\n            setPassiveListener(\n                wrappedEvent,\n                node.passive ? node.listener : null\n            )\n            if (typeof node.listener === \"function\") {\n                try {\n                    node.listener.call(this, wrappedEvent)\n                } catch (err) {\n                    if (\n                        typeof console !== \"undefined\" &&\n                        typeof console.error === \"function\"\n                    ) {\n                        console.error(err)\n                    }\n                }\n            } else if (\n                node.listenerType !== ATTRIBUTE &&\n                typeof node.listener.handleEvent === \"function\"\n            ) {\n                node.listener.handleEvent(wrappedEvent)\n            }\n\n            // Break if `event.stopImmediatePropagation` was called.\n            if (isStopped(wrappedEvent)) {\n                break\n            }\n\n            node = node.next\n        }\n        setPassiveListener(wrappedEvent, null)\n        setEventPhase(wrappedEvent, 0)\n        setCurrentTarget(wrappedEvent, null)\n\n        return !wrappedEvent.defaultPrevented\n    },\n}\n\n// `constructor` is not enumerable.\nObject.defineProperty(EventTarget.prototype, \"constructor\", {\n    value: EventTarget,\n    configurable: true,\n    writable: true,\n})\n\n// Ensure `eventTarget instanceof window.EventTarget` is `true`.\nif (\n    typeof window !== \"undefined\" &&\n    typeof window.EventTarget !== \"undefined\"\n) {\n    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype)\n}\n\nexport { defineEventAttribute, EventTarget }\nexport default 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\ No newline at end of file
diff --git a/package.json b/package.json
index 03dc705..43ac8c5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "event-target-shim",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "description": "An implementation of WHATWG EventTarget interface.",
   "main": "dist/event-target-shim",
   "types": "index.d.ts",