Modules

node_modules/event-target-shim/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Toru Nagashima
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

node_modules/event-target-shim/README.md

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+# event-target-shim
+
+[![npm version](https://img.shields.io/npm/v/event-target-shim.svg)](https://www.npmjs.com/package/event-target-shim)
+[![Downloads/month](https://img.shields.io/npm/dm/event-target-shim.svg)](http://www.npmtrends.com/event-target-shim)
+[![Build Status](https://travis-ci.org/mysticatea/event-target-shim.svg?branch=master)](https://travis-ci.org/mysticatea/event-target-shim)
+[![Coverage Status](https://codecov.io/gh/mysticatea/event-target-shim/branch/master/graph/badge.svg)](https://codecov.io/gh/mysticatea/event-target-shim)
+[![Dependency Status](https://david-dm.org/mysticatea/event-target-shim.svg)](https://david-dm.org/mysticatea/event-target-shim)
+
+An implementation of [WHATWG EventTarget interface](https://dom.spec.whatwg.org/#interface-eventtarget), plus few extensions.
+
+- This provides `EventTarget` constructor that can inherit for your custom object.
+- This provides an utility that defines properties of attribute listeners (e.g. `obj.onclick`).
+
+```js
+import {EventTarget, defineEventAttribute} from "event-target-shim"
+
+class Foo extends EventTarget {
+    // ...
+}
+
+// Define `foo.onhello` property.
+defineEventAttribute(Foo.prototype, "hello")
+
+// Use
+const foo = new Foo()
+foo.addEventListener("hello", e => console.log("hello", e))
+foo.onhello = e => console.log("onhello:", e)
+foo.dispatchEvent(new CustomEvent("hello"))
+```
+
+## 💿 Installation
+
+Use [npm](https://www.npmjs.com/) to install then use a bundler.
+
+```
+npm install event-target-shim
+```
+
+Or download from [`dist` directory](./dist).
+
+- [dist/event-target-shim.mjs](dist/event-target-shim.mjs) ... ES modules version.
+- [dist/event-target-shim.js](dist/event-target-shim.js) ... Common JS version.
+- [dist/event-target-shim.umd.js](dist/event-target-shim.umd.js) ... UMD (Universal Module Definition) version. This is transpiled by [Babel](https://babeljs.io/) for IE 11.
+
+## 📖 Usage
+
+```js
+import {EventTarget, defineEventAttribute} from "event-target-shim"
+// or
+const {EventTarget, defineEventAttribute} = require("event-target-shim")
+
+// or UMD version defines a global variable:
+const {EventTarget, defineEventAttribute} = window.EventTargetShim
+```
+
+### EventTarget
+
+> https://dom.spec.whatwg.org/#interface-eventtarget
+
+#### eventTarget.addEventListener(type, callback, options)
+
+Register an event listener.
+
+- `type` is a string. This is the event name to register.
+- `callback` is a function. This is the event listener to register.
+- `options` is a boolean or an object `{ capture?: boolean, passive?: boolean, once?: boolean }`. If this is a boolean, it's same meaning as `{ capture: options }`.
+    - `capture` is the flag to register the event listener for capture phase.
+    - `passive` is the flag to ignore `event.preventDefault()` method in the event listener.
+    - `once` is the flag to remove the event listener automatically after the first call.
+
+#### eventTarget.removeEventListener(type, callback, options)
+
+Unregister an event listener.
+
+- `type` is a string. This is the event name to unregister.
+- `callback` is a function. This is the event listener to unregister.
+- `options` is a boolean or an object `{ capture?: boolean }`. If this is a boolean, it's same meaning as `{ capture: options }`.
+    - `capture` is the flag to register the event listener for capture phase.
+
+#### eventTarget.dispatchEvent(event)
+
+Dispatch an event.
+
+- `event` is a [Event](https://dom.spec.whatwg.org/#event) object or an object `{ type: string, [key: string]: any }`. The latter is non-standard but useful. In both cases, listeners receive the event as implementing [Event](https://dom.spec.whatwg.org/#event) interface.
+
+### defineEventAttribute(proto, type)
+
+Define an event attribute (e.g. `onclick`) to `proto`. This is non-standard.
+
+- `proto` is an object (assuming it's a prototype object). This function defines a getter/setter pair for the event attribute.
+- `type` is a string. This is the event name to define.
+
+For example:
+
+```js
+class AbortSignal extends EventTarget {
+    constructor() {
+        this.aborted = false
+    }
+}
+// Define `onabort` property.
+defineEventAttribute(AbortSignal.prototype, "abort")
+```
+
+### EventTarget(types)
+
+Define a custom `EventTarget` class with event attributes. This is non-standard.
+
+- `types` is a string or an array of strings. This is the event name to define.
+
+For example:
+
+```js
+// This has `onabort` property.
+class AbortSignal extends EventTarget("abort") {
+    constructor() {
+        this.aborted = false
+    }
+}
+```
+
+## 📚 Examples
+
+### ES2015 and later
+
+> https://jsfiddle.net/636vea92/
+
+```js
+const {EventTarget, defineEventAttribute} = EventTargetShim
+
+// Define a derived class.
+class Foo extends EventTarget {
+    // ...
+}
+
+// Define `foo.onhello` property.
+defineEventAttribute(Foo.prototype, "hello")
+
+// Register event listeners.
+const foo = new Foo()
+foo.addEventListener("hello", (e) => {
+    console.log("hello", e)
+})
+foo.onhello = (e) => {
+    console.log("onhello", e)
+}
+
+// Dispatching events
+foo.dispatchEvent(new CustomEvent("hello", { detail: "detail" }))
+```
+
+### Typescript
+
+```ts
+import { EventTarget, defineEventAttribute } from "event-target-shim";
+
+// Define events
+type FooEvents = {
+    hello: CustomEvent
+}
+type FooEventAttributes = {
+    onhello: CustomEvent
+}
+
+// Define a derived class.
+class Foo extends EventTarget<FooEvents, FooEventAttributes> {
+    // ...
+}
+// Define `foo.onhello` property's implementation.
+defineEventAttribute(Foo.prototype, "hello")
+
+// Register event listeners.
+const foo = new Foo()
+foo.addEventListener("hello", (e) => {
+    console.log("hello", e.detail)
+})
+foo.onhello = (e) => {
+    console.log("onhello", e.detail)
+}
+
+// Dispatching events
+foo.dispatchEvent(new CustomEvent("hello", { detail: "detail" }))
+```
+
+Unfortunately, both `FooEvents` and `FooEventAttributes` are needed because TypeScript doesn't allow the mutation of string literal types. If TypeScript allowed us to compute `"onhello"` from `"hello"` in types, `FooEventAttributes` will be optional.
+
+This `EventTarget` type is compatible with `EventTarget` interface of `lib.dom.d.ts`.
+
+#### To disallow unknown events
+
+By default, methods such as `addEventListener` accept unknown events. You can disallow unknown events by the third type parameter `"strict"`.
+
+```ts
+type FooEvents = {
+    hello: CustomEvent
+}
+class Foo extends EventTarget<FooEvents, {}, "strict"> {
+    // ...
+}
+
+// OK because `hello` is defined in FooEvents.
+foo.addEventListener("hello", (e) => {
+})
+// Error because `unknown` is not defined in FooEvents.
+foo.addEventListener("unknown", (e) => {
+})
+```
+
+However, if you use `"strict"` parameter, it loses compatibility with `EventTarget` interface of `lib.dom.d.ts`.
+
+#### To infer the type of `dispatchEvent()` method
+
+TypeScript cannot infer the event type of `dispatchEvent()` method properly from the argument in most cases. You can improve this behavior with the following steps:
+
+1. Use the third type parameter `"strict"`. This prevents inferring to `dispatchEvent<string>()`.
+2. Make the `type` property of event definitions stricter.
+
+```ts
+type FooEvents = {
+    hello: CustomEvent & { type: "hello" }
+    hey: Event & { type: "hey" }
+}
+class Foo extends EventTarget<FooEvents, {}, "strict"> {
+    // ...
+}
+
+// Error because `detail` property is lacking.
+foo.dispatchEvent({ type: "hello" })
+```
+
+### ES5
+
+> https://jsfiddle.net/522zc9de/
+
+```js
+// Define a derived class.
+function Foo() {
+    EventTarget.call(this)
+}
+Foo.prototype = Object.create(EventTarget.prototype, {
+    constructor: { value: Foo, configurable: true, writable: true }
+    // ...
+})
+
+// Define `foo.onhello` property.
+defineEventAttribute(Foo.prototype, "hello")
+
+// Register event listeners.
+var foo = new Foo()
+foo.addEventListener("hello", function(e) {
+    console.log("hello", e)
+})
+foo.onhello = function(e) {
+    console.log("onhello", e)
+}
+
+// Dispatching events
+function isSupportEventConstrucor() { // IE does not support.
+    try {
+        new CusomEvent("hello")
+        return true
+    } catch (_err) {
+        return false
+    }
+}
+if (isSupportEventConstrucor()) {
+    foo.dispatchEvent(new CustomEvent("hello", { detail: "detail" }))
+} else {
+    var e = document.createEvent("CustomEvent")
+    e.initCustomEvent("hello", false, false, "detail")
+    foo.dispatchEvent(e)
+}
+```
+
+## 📰 Changelog
+
+- See [GitHub releases](https://github.com/mysticatea/event-target-shim/releases).
+
+## 🍻 Contributing
+
+Contributing is welcome ❤️
+
+Please use GitHub issues/PRs.
+
+### Development tools
+
+- `npm install` installs dependencies for development.
+- `npm test` runs tests and measures code coverage.
+- `npm run clean` removes temporary files of tests.
+- `npm run coverage` opens code coverage of the previous test with your default browser.
+- `npm run lint` runs ESLint.
+- `npm run build` generates `dist` codes.
+- `npm run watch` runs tests on each file change.

node_modules/event-target-shim/dist/event-target-shim.js

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+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ * @copyright 2015 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+/**
+ * @typedef {object} PrivateData
+ * @property {EventTarget} eventTarget The event target.
+ * @property {{type:string}} event The original event object.
+ * @property {number} eventPhase The current event phase.
+ * @property {EventTarget|null} currentTarget The current event target.
+ * @property {boolean} canceled The flag to prevent default.
+ * @property {boolean} stopped The flag to stop propagation.
+ * @property {boolean} immediateStopped The flag to stop propagation immediately.
+ * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.
+ * @property {number} timeStamp The unix time.
+ * @private
+ */
+
+/**
+ * Private data for event wrappers.
+ * @type {WeakMap<Event, PrivateData>}
+ * @private
+ */
+const privateData = new WeakMap();
+
+/**
+ * Cache for wrapper classes.
+ * @type {WeakMap<Object, Function>}
+ * @private
+ */
+const wrappers = new WeakMap();
+
+/**
+ * Get private data.
+ * @param {Event} event The event object to get private data.
+ * @returns {PrivateData} The private data of the event.
+ * @private
+ */
+function pd(event) {
+    const retv = privateData.get(event);
+    console.assert(
+        retv != null,
+        "'this' is expected an Event object, but got",
+        event
+    );
+    return retv
+}
+
+/**
+ * https://dom.spec.whatwg.org/#set-the-canceled-flag
+ * @param data {PrivateData} private data.
+ */
+function setCancelFlag(data) {
+    if (data.passiveListener != null) {
+        if (
+            typeof console !== "undefined" &&
+            typeof console.error === "function"
+        ) {
+            console.error(
+                "Unable to preventDefault inside passive event listener invocation.",
+                data.passiveListener
+            );
+        }
+        return
+    }
+    if (!data.event.cancelable) {
+        return
+    }
+
+    data.canceled = true;
+    if (typeof data.event.preventDefault === "function") {
+        data.event.preventDefault();
+    }
+}
+
+/**
+ * @see https://dom.spec.whatwg.org/#interface-event
+ * @private
+ */
+/**
+ * The event wrapper.
+ * @constructor
+ * @param {EventTarget} eventTarget The event target of this dispatching.
+ * @param {Event|{type:string}} event The original event to wrap.
+ */
+function Event(eventTarget, event) {
+    privateData.set(this, {
+        eventTarget,
+        event,
+        eventPhase: 2,
+        currentTarget: eventTarget,
+        canceled: false,
+        stopped: false,
+        immediateStopped: false,
+        passiveListener: null,
+        timeStamp: event.timeStamp || Date.now(),
+    });
+
+    // https://heycam.github.io/webidl/#Unforgeable
+    Object.defineProperty(this, "isTrusted", { value: false, enumerable: true });
+
+    // Define accessors
+    const keys = Object.keys(event);
+    for (let i = 0; i < keys.length; ++i) {
+        const key = keys[i];
+        if (!(key in this)) {
+            Object.defineProperty(this, key, defineRedirectDescriptor(key));
+        }
+    }
+}
+
+// Should be enumerable, but class methods are not enumerable.
+Event.prototype = {
+    /**
+     * The type of this event.
+     * @type {string}
+     */
+    get type() {
+        return pd(this).event.type
+    },
+
+    /**
+     * The target of this event.
+     * @type {EventTarget}
+     */
+    get target() {
+        return pd(this).eventTarget
+    },
+
+    /**
+     * The target of this event.
+     * @type {EventTarget}
+     */
+    get currentTarget() {
+        return pd(this).currentTarget
+    },
+
+    /**
+     * @returns {EventTarget[]} The composed path of this event.
+     */
+    composedPath() {
+        const currentTarget = pd(this).currentTarget;
+        if (currentTarget == null) {
+            return []
+        }
+        return [currentTarget]
+    },
+
+    /**
+     * Constant of NONE.
+     * @type {number}
+     */
+    get NONE() {
+        return 0
+    },
+
+    /**
+     * Constant of CAPTURING_PHASE.
+     * @type {number}
+     */
+    get CAPTURING_PHASE() {
+        return 1
+    },
+
+    /**
+     * Constant of AT_TARGET.
+     * @type {number}
+     */
+    get AT_TARGET() {
+        return 2
+    },
+
+    /**
+     * Constant of BUBBLING_PHASE.
+     * @type {number}
+     */
+    get BUBBLING_PHASE() {
+        return 3
+    },
+
+    /**
+     * The target of this event.
+     * @type {number}
+     */
+    get eventPhase() {
+        return pd(this).eventPhase
+    },
+
+    /**
+     * Stop event bubbling.
+     * @returns {void}
+     */
+    stopPropagation() {
+        const data = pd(this);
+
+        data.stopped = true;
+        if (typeof data.event.stopPropagation === "function") {
+            data.event.stopPropagation();
+        }
+    },
+
+    /**
+     * Stop event bubbling.
+     * @returns {void}
+     */
+    stopImmediatePropagation() {
+        const data = pd(this);
+
+        data.stopped = true;
+        data.immediateStopped = true;
+        if (typeof data.event.stopImmediatePropagation === "function") {
+            data.event.stopImmediatePropagation();
+        }
+    },
+
+    /**
+     * The flag to be bubbling.
+     * @type {boolean}
+     */
+    get bubbles() {
+        return Boolean(pd(this).event.bubbles)
+    },
+
+    /**
+     * The flag to be cancelable.
+     * @type {boolean}
+     */
+    get cancelable() {
+        return Boolean(pd(this).event.cancelable)
+    },
+
+    /**
+     * Cancel this event.
+     * @returns {void}
+     */
+    preventDefault() {
+        setCancelFlag(pd(this));
+    },
+
+    /**
+     * The flag to indicate cancellation state.
+     * @type {boolean}
+     */
+    get defaultPrevented() {
+        return pd(this).canceled
+    },
+
+    /**
+     * The flag to be composed.
+     * @type {boolean}
+     */
+    get composed() {
+        return Boolean(pd(this).event.composed)
+    },
+
+    /**
+     * The unix time of this event.
+     * @type {number}
+     */
+    get timeStamp() {
+        return pd(this).timeStamp
+    },
+
+    /**
+     * The target of this event.
+     * @type {EventTarget}
+     * @deprecated
+     */
+    get srcElement() {
+        return pd(this).eventTarget
+    },
+
+    /**
+     * The flag to stop event bubbling.
+     * @type {boolean}
+     * @deprecated
+     */
+    get cancelBubble() {
+        return pd(this).stopped
+    },
+    set cancelBubble(value) {
+        if (!value) {
+            return
+        }
+        const data = pd(this);
+
+        data.stopped = true;
+        if (typeof data.event.cancelBubble === "boolean") {
+            data.event.cancelBubble = true;
+        }
+    },
+
+    /**
+     * The flag to indicate cancellation state.
+     * @type {boolean}
+     * @deprecated
+     */
+    get returnValue() {
+        return !pd(this).canceled
+    },
+    set returnValue(value) {
+        if (!value) {
+            setCancelFlag(pd(this));
+        }
+    },
+
+    /**
+     * Initialize this event object. But do nothing under event dispatching.
+     * @param {string} type The event type.
+     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.
+     * @param {boolean} [cancelable=false] The flag to be possible to cancel.
+     * @deprecated
+     */
+    initEvent() {
+        // Do nothing.
+    },
+};
+
+// `constructor` is not enumerable.
+Object.defineProperty(Event.prototype, "constructor", {
+    value: Event,
+    configurable: true,
+    writable: true,
+});
+
+// Ensure `event instanceof window.Event` is `true`.
+if (typeof window !== "undefined" && typeof window.Event !== "undefined") {
+    Object.setPrototypeOf(Event.prototype, window.Event.prototype);
+
+    // Make association for wrappers.
+    wrappers.set(window.Event.prototype, Event);
+}
+
+/**
+ * Get the property descriptor to redirect a given property.
+ * @param {string} key Property name to define property descriptor.
+ * @returns {PropertyDescriptor} The property descriptor to redirect the property.
+ * @private
+ */
+function defineRedirectDescriptor(key) {
+    return {
+        get() {
+            return pd(this).event[key]
+        },
+        set(value) {
+            pd(this).event[key] = value;
+        },
+        configurable: true,
+        enumerable: true,
+    }
+}
+
+/**
+ * Get the property descriptor to call a given method property.
+ * @param {string} key Property name to define property descriptor.
+ * @returns {PropertyDescriptor} The property descriptor to call the method property.
+ * @private
+ */
+function defineCallDescriptor(key) {
+    return {
+        value() {
+            const event = pd(this).event;
+            return event[key].apply(event, arguments)
+        },
+        configurable: true,
+        enumerable: true,
+    }
+}
+
+/**
+ * Define new wrapper class.
+ * @param {Function} BaseEvent The base wrapper class.
+ * @param {Object} proto The prototype of the original event.
+ * @returns {Function} The defined wrapper class.
+ * @private
+ */
+function defineWrapper(BaseEvent, proto) {
+    const keys = Object.keys(proto);
+    if (keys.length === 0) {
+        return BaseEvent
+    }
+
+    /** CustomEvent */
+    function CustomEvent(eventTarget, event) {
+        BaseEvent.call(this, eventTarget, event);
+    }
+
+    CustomEvent.prototype = Object.create(BaseEvent.prototype, {
+        constructor: { value: CustomEvent, configurable: true, writable: true },
+    });
+
+    // Define accessors.
+    for (let i = 0; i < keys.length; ++i) {
+        const key = keys[i];
+        if (!(key in BaseEvent.prototype)) {
+            const descriptor = Object.getOwnPropertyDescriptor(proto, key);
+            const isFunc = typeof descriptor.value === "function";
+            Object.defineProperty(
+                CustomEvent.prototype,
+                key,
+                isFunc
+                    ? defineCallDescriptor(key)
+                    : defineRedirectDescriptor(key)
+            );
+        }
+    }
+
+    return CustomEvent
+}
+
+/**
+ * Get the wrapper class of a given prototype.
+ * @param {Object} proto The prototype of the original event to get its wrapper.
+ * @returns {Function} The wrapper class.
+ * @private
+ */
+function getWrapper(proto) {
+    if (proto == null || proto === Object.prototype) {
+        return Event
+    }
+
+    let wrapper = wrappers.get(proto);
+    if (wrapper == null) {
+        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto);
+        wrappers.set(proto, wrapper);
+    }
+    return wrapper
+}
+
+/**
+ * Wrap a given event to management a dispatching.
+ * @param {EventTarget} eventTarget The event target of this dispatching.
+ * @param {Object} event The event to wrap.
+ * @returns {Event} The wrapper instance.
+ * @private
+ */
+function wrapEvent(eventTarget, event) {
+    const Wrapper = getWrapper(Object.getPrototypeOf(event));
+    return new Wrapper(eventTarget, event)
+}
+
+/**
+ * Get the immediateStopped flag of a given event.
+ * @param {Event} event The event to get.
+ * @returns {boolean} The flag to stop propagation immediately.
+ * @private
+ */
+function isStopped(event) {
+    return pd(event).immediateStopped
+}
+
+/**
+ * Set the current event phase of a given event.
+ * @param {Event} event The event to set current target.
+ * @param {number} eventPhase New event phase.
+ * @returns {void}
+ * @private
+ */
+function setEventPhase(event, eventPhase) {
+    pd(event).eventPhase = eventPhase;
+}
+
+/**
+ * Set the current target of a given event.
+ * @param {Event} event The event to set current target.
+ * @param {EventTarget|null} currentTarget New current target.
+ * @returns {void}
+ * @private
+ */
+function setCurrentTarget(event, currentTarget) {
+    pd(event).currentTarget = currentTarget;
+}
+
+/**
+ * Set a passive listener of a given event.
+ * @param {Event} event The event to set current target.
+ * @param {Function|null} passiveListener New passive listener.
+ * @returns {void}
+ * @private
+ */
+function setPassiveListener(event, passiveListener) {
+    pd(event).passiveListener = passiveListener;
+}
+
+/**
+ * @typedef {object} ListenerNode
+ * @property {Function} listener
+ * @property {1|2|3} listenerType
+ * @property {boolean} passive
+ * @property {boolean} once
+ * @property {ListenerNode|null} next
+ * @private
+ */
+
+/**
+ * @type {WeakMap<object, Map<string, ListenerNode>>}
+ * @private
+ */
+const listenersMap = new WeakMap();
+
+// Listener types
+const CAPTURE = 1;
+const BUBBLE = 2;
+const ATTRIBUTE = 3;
+
+/**
+ * Check whether a given value is an object or not.
+ * @param {any} x The value to check.
+ * @returns {boolean} `true` if the value is an object.
+ */
+function isObject(x) {
+    return x !== null && typeof x === "object" //eslint-disable-line no-restricted-syntax
+}
+
+/**
+ * Get listeners.
+ * @param {EventTarget} eventTarget The event target to get.
+ * @returns {Map<string, ListenerNode>} The listeners.
+ * @private
+ */
+function getListeners(eventTarget) {
+    const listeners = listenersMap.get(eventTarget);
+    if (listeners == null) {
+        throw new TypeError(
+            "'this' is expected an EventTarget object, but got another value."
+        )
+    }
+    return listeners
+}
+
+/**
+ * Get the property descriptor for the event attribute of a given event.
+ * @param {string} eventName The event name to get property descriptor.
+ * @returns {PropertyDescriptor} The property descriptor.
+ * @private
+ */
+function defineEventAttributeDescriptor(eventName) {
+    return {
+        get() {
+            const listeners = getListeners(this);
+            let node = listeners.get(eventName);
+            while (node != null) {
+                if (node.listenerType === ATTRIBUTE) {
+                    return node.listener
+                }
+                node = node.next;
+            }
+            return null
+        },
+
+        set(listener) {
+            if (typeof listener !== "function" && !isObject(listener)) {
+                listener = null; // eslint-disable-line no-param-reassign
+            }
+            const listeners = getListeners(this);
+
+            // Traverse to the tail while removing old value.
+            let prev = null;
+            let node = listeners.get(eventName);
+            while (node != null) {
+                if (node.listenerType === ATTRIBUTE) {
+                    // Remove old value.
+                    if (prev !== null) {
+                        prev.next = node.next;
+                    } else if (node.next !== null) {
+                        listeners.set(eventName, node.next);
+                    } else {
+                        listeners.delete(eventName);
+                    }
+                } else {
+                    prev = node;
+                }
+
+                node = node.next;
+            }
+
+            // Add new value.
+            if (listener !== null) {
+                const newNode = {
+                    listener,
+                    listenerType: ATTRIBUTE,
+                    passive: false,
+                    once: false,
+                    next: null,
+                };
+                if (prev === null) {
+                    listeners.set(eventName, newNode);
+                } else {
+                    prev.next = newNode;
+                }
+            }
+        },
+        configurable: true,
+        enumerable: true,
+    }
+}
+
+/**
+ * Define an event attribute (e.g. `eventTarget.onclick`).
+ * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.
+ * @param {string} eventName The event name to define.
+ * @returns {void}
+ */
+function defineEventAttribute(eventTargetPrototype, eventName) {
+    Object.defineProperty(
+        eventTargetPrototype,
+        `on${eventName}`,
+        defineEventAttributeDescriptor(eventName)
+    );
+}
+
+/**
+ * Define a custom EventTarget with event attributes.
+ * @param {string[]} eventNames Event names for event attributes.
+ * @returns {EventTarget} The custom EventTarget.
+ * @private
+ */
+function defineCustomEventTarget(eventNames) {
+    /** CustomEventTarget */
+    function CustomEventTarget() {
+        EventTarget.call(this);
+    }
+
+    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {
+        constructor: {
+            value: CustomEventTarget,
+            configurable: true,
+            writable: true,
+        },
+    });
+
+    for (let i = 0; i < eventNames.length; ++i) {
+        defineEventAttribute(CustomEventTarget.prototype, eventNames[i]);
+    }
+
+    return CustomEventTarget
+}
+
+/**
+ * EventTarget.
+ *
+ * - This is constructor if no arguments.
+ * - This is a function which returns a CustomEventTarget constructor if there are arguments.
+ *
+ * For example:
+ *
+ *     class A extends EventTarget {}
+ *     class B extends EventTarget("message") {}
+ *     class C extends EventTarget("message", "error") {}
+ *     class D extends EventTarget(["message", "error"]) {}
+ */
+function EventTarget() {
+    /*eslint-disable consistent-return */
+    if (this instanceof EventTarget) {
+        listenersMap.set(this, new Map());
+        return
+    }
+    if (arguments.length === 1 && Array.isArray(arguments[0])) {
+        return defineCustomEventTarget(arguments[0])
+    }
+    if (arguments.length > 0) {
+        const types = new Array(arguments.length);
+        for (let i = 0; i < arguments.length; ++i) {
+            types[i] = arguments[i];
+        }
+        return defineCustomEventTarget(types)
+    }
+    throw new TypeError("Cannot call a class as a function")
+    /*eslint-enable consistent-return */
+}
+
+// Should be enumerable, but class methods are not enumerable.
+EventTarget.prototype = {
+    /**
+     * Add a given listener to this event target.
+     * @param {string} eventName The event name to add.
+     * @param {Function} listener The listener to add.
+     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.
+     * @returns {void}
+     */
+    addEventListener(eventName, listener, options) {
+        if (listener == null) {
+            return
+        }
+        if (typeof listener !== "function" && !isObject(listener)) {
+            throw new TypeError("'listener' should be a function or an object.")
+        }
+
+        const listeners = getListeners(this);
+        const optionsIsObj = isObject(options);
+        const capture = optionsIsObj
+            ? Boolean(options.capture)
+            : Boolean(options);
+        const listenerType = capture ? CAPTURE : BUBBLE;
+        const newNode = {
+            listener,
+            listenerType,
+            passive: optionsIsObj && Boolean(options.passive),
+            once: optionsIsObj && Boolean(options.once),
+            next: null,
+        };
+
+        // Set it as the first node if the first node is null.
+        let node = listeners.get(eventName);
+        if (node === undefined) {
+            listeners.set(eventName, newNode);
+            return
+        }
+
+        // Traverse to the tail while checking duplication..
+        let prev = null;
+        while (node != null) {
+            if (
+                node.listener === listener &&
+                node.listenerType === listenerType
+            ) {
+                // Should ignore duplication.
+                return
+            }
+            prev = node;
+            node = node.next;
+        }
+
+        // Add it.
+        prev.next = newNode;
+    },
+
+    /**
+     * Remove a given listener from this event target.
+     * @param {string} eventName The event name to remove.
+     * @param {Function} listener The listener to remove.
+     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.
+     * @returns {void}
+     */
+    removeEventListener(eventName, listener, options) {
+        if (listener == null) {
+            return
+        }
+
+        const listeners = getListeners(this);
+        const capture = isObject(options)
+            ? Boolean(options.capture)
+            : Boolean(options);
+        const listenerType = capture ? CAPTURE : BUBBLE;
+
+        let prev = null;
+        let node = listeners.get(eventName);
+        while (node != null) {
+            if (
+                node.listener === listener &&
+                node.listenerType === listenerType
+            ) {
+                if (prev !== null) {
+                    prev.next = node.next;
+                } else if (node.next !== null) {
+                    listeners.set(eventName, node.next);
+                } else {
+                    listeners.delete(eventName);
+                }
+                return
+            }
+
+            prev = node;
+            node = node.next;
+        }
+    },
+
+    /**
+     * Dispatch a given event.
+     * @param {Event|{type:string}} event The event to dispatch.
+     * @returns {boolean} `false` if canceled.
+     */
+    dispatchEvent(event) {
+        if (event == null || typeof event.type !== "string") {
+            throw new TypeError('"event.type" should be a string.')
+        }
+
+        // If listeners aren't registered, terminate.
+        const listeners = getListeners(this);
+        const eventName = event.type;
+        let node = listeners.get(eventName);
+        if (node == null) {
+            return true
+        }
+
+        // Since we cannot rewrite several properties, so wrap object.
+        const wrappedEvent = wrapEvent(this, event);
+
+        // This doesn't process capturing phase and bubbling phase.
+        // This isn't participating in a tree.
+        let prev = null;
+        while (node != null) {
+            // Remove this listener if it's once
+            if (node.once) {
+                if (prev !== null) {
+                    prev.next = node.next;
+                } else if (node.next !== null) {
+                    listeners.set(eventName, node.next);
+                } else {
+                    listeners.delete(eventName);
+                }
+            } else {
+                prev = node;
+            }
+
+            // Call this listener
+            setPassiveListener(
+                wrappedEvent,
+                node.passive ? node.listener : null
+            );
+            if (typeof node.listener === "function") {
+                try {
+                    node.listener.call(this, wrappedEvent);
+                } catch (err) {
+                    if (
+                        typeof console !== "undefined" &&
+                        typeof console.error === "function"
+                    ) {
+                        console.error(err);
+                    }
+                }
+            } else if (
+                node.listenerType !== ATTRIBUTE &&
+                typeof node.listener.handleEvent === "function"
+            ) {
+                node.listener.handleEvent(wrappedEvent);
+            }
+
+            // Break if `event.stopImmediatePropagation` was called.
+            if (isStopped(wrappedEvent)) {
+                break
+            }
+
+            node = node.next;
+        }
+        setPassiveListener(wrappedEvent, null);
+        setEventPhase(wrappedEvent, 0);
+        setCurrentTarget(wrappedEvent, null);
+
+        return !wrappedEvent.defaultPrevented
+    },
+};
+
+// `constructor` is not enumerable.
+Object.defineProperty(EventTarget.prototype, "constructor", {
+    value: EventTarget,
+    configurable: true,
+    writable: true,
+});
+
+// Ensure `eventTarget instanceof window.EventTarget` is `true`.
+if (
+    typeof window !== "undefined" &&
+    typeof window.EventTarget !== "undefined"
+) {
+    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype);
+}
+
+exports.defineEventAttribute = defineEventAttribute;
+exports.EventTarget = EventTarget;
+exports.default = EventTarget;
+
+module.exports = EventTarget
+module.exports.EventTarget = module.exports["default"] = EventTarget
+module.exports.defineEventAttribute = defineEventAttribute
+//# sourceMappingURL=event-target-shim.js.map

node_modules/event-target-shim/dist/event-target-shim.mjs

@@ -0,0 +1,862 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ * @copyright 2015 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+/**
+ * @typedef {object} PrivateData
+ * @property {EventTarget} eventTarget The event target.
+ * @property {{type:string}} event The original event object.
+ * @property {number} eventPhase The current event phase.
+ * @property {EventTarget|null} currentTarget The current event target.
+ * @property {boolean} canceled The flag to prevent default.
+ * @property {boolean} stopped The flag to stop propagation.
+ * @property {boolean} immediateStopped The flag to stop propagation immediately.
+ * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.
+ * @property {number} timeStamp The unix time.
+ * @private
+ */
+
+/**
+ * Private data for event wrappers.
+ * @type {WeakMap<Event, PrivateData>}
+ * @private
+ */
+const privateData = new WeakMap();
+
+/**
+ * Cache for wrapper classes.
+ * @type {WeakMap<Object, Function>}
+ * @private
+ */
+const wrappers = new WeakMap();
+
+/**
+ * Get private data.
+ * @param {Event} event The event object to get private data.
+ * @returns {PrivateData} The private data of the event.
+ * @private
+ */
+function pd(event) {
+    const retv = privateData.get(event);
+    console.assert(
+        retv != null,
+        "'this' is expected an Event object, but got",
+        event
+    );
+    return retv
+}
+
+/**
+ * https://dom.spec.whatwg.org/#set-the-canceled-flag
+ * @param data {PrivateData} private data.
+ */
+function setCancelFlag(data) {
+    if (data.passiveListener != null) {
+        if (
+            typeof console !== "undefined" &&
+            typeof console.error === "function"
+        ) {
+            console.error(
+                "Unable to preventDefault inside passive event listener invocation.",
+                data.passiveListener
+            );
+        }
+        return
+    }
+    if (!data.event.cancelable) {
+        return
+    }
+
+    data.canceled = true;
+    if (typeof data.event.preventDefault === "function") {
+        data.event.preventDefault();
+    }
+}
+
+/**
+ * @see https://dom.spec.whatwg.org/#interface-event
+ * @private
+ */
+/**
+ * The event wrapper.
+ * @constructor
+ * @param {EventTarget} eventTarget The event target of this dispatching.
+ * @param {Event|{type:string}} event The original event to wrap.
+ */
+function Event(eventTarget, event) {
+    privateData.set(this, {
+        eventTarget,
+        event,
+        eventPhase: 2,
+        currentTarget: eventTarget,
+        canceled: false,
+        stopped: false,
+        immediateStopped: false,
+        passiveListener: null,
+        timeStamp: event.timeStamp || Date.now(),
+    });
+
+    // https://heycam.github.io/webidl/#Unforgeable
+    Object.defineProperty(this, "isTrusted", { value: false, enumerable: true });
+
+    // Define accessors
+    const keys = Object.keys(event);
+    for (let i = 0; i < keys.length; ++i) {
+        const key = keys[i];
+        if (!(key in this)) {
+            Object.defineProperty(this, key, defineRedirectDescriptor(key));
+        }
+    }
+}
+
+// Should be enumerable, but class methods are not enumerable.
+Event.prototype = {
+    /**
+     * The type of this event.
+     * @type {string}
+     */
+    get type() {
+        return pd(this).event.type
+    },
+
+    /**
+     * The target of this event.
+     * @type {EventTarget}
+     */
+    get target() {
+        return pd(this).eventTarget
+    },
+
+    /**
+     * The target of this event.
+     * @type {EventTarget}
+     */
+    get currentTarget() {
+        return pd(this).currentTarget
+    },
+
+    /**
+     * @returns {EventTarget[]} The composed path of this event.
+     */
+    composedPath() {
+        const currentTarget = pd(this).currentTarget;
+        if (currentTarget == null) {
+            return []
+        }
+        return [currentTarget]
+    },
+
+    /**
+     * Constant of NONE.
+     * @type {number}
+     */
+    get NONE() {
+        return 0
+    },
+
+    /**
+     * Constant of CAPTURING_PHASE.
+     * @type {number}
+     */
+    get CAPTURING_PHASE() {
+        return 1
+    },
+
+    /**
+     * Constant of AT_TARGET.
+     * @type {number}
+     */
+    get AT_TARGET() {
+        return 2
+    },
+
+    /**
+     * Constant of BUBBLING_PHASE.
+     * @type {number}
+     */
+    get BUBBLING_PHASE() {
+        return 3
+    },
+
+    /**
+     * The target of this event.
+     * @type {number}
+     */
+    get eventPhase() {
+        return pd(this).eventPhase
+    },
+
+    /**
+     * Stop event bubbling.
+     * @returns {void}
+     */
+    stopPropagation() {
+        const data = pd(this);
+
+        data.stopped = true;
+        if (typeof data.event.stopPropagation === "function") {
+            data.event.stopPropagation();
+        }
+    },
+
+    /**
+     * Stop event bubbling.
+     * @returns {void}
+     */
+    stopImmediatePropagation() {
+        const data = pd(this);
+
+        data.stopped = true;
+        data.immediateStopped = true;
+        if (typeof data.event.stopImmediatePropagation === "function") {
+            data.event.stopImmediatePropagation();
+        }
+    },
+
+    /**
+     * The flag to be bubbling.
+     * @type {boolean}
+     */
+    get bubbles() {
+        return Boolean(pd(this).event.bubbles)
+    },
+
+    /**
+     * The flag to be cancelable.
+     * @type {boolean}
+     */
+    get cancelable() {
+        return Boolean(pd(this).event.cancelable)
+    },
+
+    /**
+     * Cancel this event.
+     * @returns {void}
+     */
+    preventDefault() {
+        setCancelFlag(pd(this));
+    },
+
+    /**
+     * The flag to indicate cancellation state.
+     * @type {boolean}
+     */
+    get defaultPrevented() {
+        return pd(this).canceled
+    },
+
+    /**
+     * The flag to be composed.
+     * @type {boolean}
+     */
+    get composed() {
+        return Boolean(pd(this).event.composed)
+    },
+
+    /**
+     * The unix time of this event.
+     * @type {number}
+     */
+    get timeStamp() {
+        return pd(this).timeStamp
+    },
+
+    /**
+     * The target of this event.
+     * @type {EventTarget}
+     * @deprecated
+     */
+    get srcElement() {
+        return pd(this).eventTarget
+    },
+
+    /**
+     * The flag to stop event bubbling.
+     * @type {boolean}
+     * @deprecated
+     */
+    get cancelBubble() {
+        return pd(this).stopped
+    },
+    set cancelBubble(value) {
+        if (!value) {
+            return
+        }
+        const data = pd(this);
+
+        data.stopped = true;
+        if (typeof data.event.cancelBubble === "boolean") {
+            data.event.cancelBubble = true;
+        }
+    },
+
+    /**
+     * The flag to indicate cancellation state.
+     * @type {boolean}
+     * @deprecated
+     */
+    get returnValue() {
+        return !pd(this).canceled
+    },
+    set returnValue(value) {
+        if (!value) {
+            setCancelFlag(pd(this));
+        }
+    },
+
+    /**
+     * Initialize this event object. But do nothing under event dispatching.
+     * @param {string} type The event type.
+     * @param {boolean} [bubbles=false] The flag to be possible to bubble up.
+     * @param {boolean} [cancelable=false] The flag to be possible to cancel.
+     * @deprecated
+     */
+    initEvent() {
+        // Do nothing.
+    },
+};
+
+// `constructor` is not enumerable.
+Object.defineProperty(Event.prototype, "constructor", {
+    value: Event,
+    configurable: true,
+    writable: true,
+});
+
+// Ensure `event instanceof window.Event` is `true`.
+if (typeof window !== "undefined" && typeof window.Event !== "undefined") {
+    Object.setPrototypeOf(Event.prototype, window.Event.prototype);
+
+    // Make association for wrappers.
+    wrappers.set(window.Event.prototype, Event);
+}
+
+/**
+ * Get the property descriptor to redirect a given property.
+ * @param {string} key Property name to define property descriptor.
+ * @returns {PropertyDescriptor} The property descriptor to redirect the property.
+ * @private
+ */
+function defineRedirectDescriptor(key) {
+    return {
+        get() {
+            return pd(this).event[key]
+        },
+        set(value) {
+            pd(this).event[key] = value;
+        },
+        configurable: true,
+        enumerable: true,
+    }
+}
+
+/**
+ * Get the property descriptor to call a given method property.
+ * @param {string} key Property name to define property descriptor.
+ * @returns {PropertyDescriptor} The property descriptor to call the method property.
+ * @private
+ */
+function defineCallDescriptor(key) {
+    return {
+        value() {
+            const event = pd(this).event;
+            return event[key].apply(event, arguments)
+        },
+        configurable: true,
+        enumerable: true,
+    }
+}
+
+/**
+ * Define new wrapper class.
+ * @param {Function} BaseEvent The base wrapper class.
+ * @param {Object} proto The prototype of the original event.
+ * @returns {Function} The defined wrapper class.
+ * @private
+ */
+function defineWrapper(BaseEvent, proto) {
+    const keys = Object.keys(proto);
+    if (keys.length === 0) {
+        return BaseEvent
+    }
+
+    /** CustomEvent */
+    function CustomEvent(eventTarget, event) {
+        BaseEvent.call(this, eventTarget, event);
+    }
+
+    CustomEvent.prototype = Object.create(BaseEvent.prototype, {
+        constructor: { value: CustomEvent, configurable: true, writable: true },
+    });
+
+    // Define accessors.
+    for (let i = 0; i < keys.length; ++i) {
+        const key = keys[i];
+        if (!(key in BaseEvent.prototype)) {
+            const descriptor = Object.getOwnPropertyDescriptor(proto, key);
+            const isFunc = typeof descriptor.value === "function";
+            Object.defineProperty(
+                CustomEvent.prototype,
+                key,
+                isFunc
+                    ? defineCallDescriptor(key)
+                    : defineRedirectDescriptor(key)
+            );
+        }
+    }
+
+    return CustomEvent
+}
+
+/**
+ * Get the wrapper class of a given prototype.
+ * @param {Object} proto The prototype of the original event to get its wrapper.
+ * @returns {Function} The wrapper class.
+ * @private
+ */
+function getWrapper(proto) {
+    if (proto == null || proto === Object.prototype) {
+        return Event
+    }
+
+    let wrapper = wrappers.get(proto);
+    if (wrapper == null) {
+        wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto);
+        wrappers.set(proto, wrapper);
+    }
+    return wrapper
+}
+
+/**
+ * Wrap a given event to management a dispatching.
+ * @param {EventTarget} eventTarget The event target of this dispatching.
+ * @param {Object} event The event to wrap.
+ * @returns {Event} The wrapper instance.
+ * @private
+ */
+function wrapEvent(eventTarget, event) {
+    const Wrapper = getWrapper(Object.getPrototypeOf(event));
+    return new Wrapper(eventTarget, event)
+}
+
+/**
+ * Get the immediateStopped flag of a given event.
+ * @param {Event} event The event to get.
+ * @returns {boolean} The flag to stop propagation immediately.
+ * @private
+ */
+function isStopped(event) {
+    return pd(event).immediateStopped
+}
+
+/**
+ * Set the current event phase of a given event.
+ * @param {Event} event The event to set current target.
+ * @param {number} eventPhase New event phase.
+ * @returns {void}
+ * @private
+ */
+function setEventPhase(event, eventPhase) {
+    pd(event).eventPhase = eventPhase;
+}
+
+/**
+ * Set the current target of a given event.
+ * @param {Event} event The event to set current target.
+ * @param {EventTarget|null} currentTarget New current target.
+ * @returns {void}
+ * @private
+ */
+function setCurrentTarget(event, currentTarget) {
+    pd(event).currentTarget = currentTarget;
+}
+
+/**
+ * Set a passive listener of a given event.
+ * @param {Event} event The event to set current target.
+ * @param {Function|null} passiveListener New passive listener.
+ * @returns {void}
+ * @private
+ */
+function setPassiveListener(event, passiveListener) {
+    pd(event).passiveListener = passiveListener;
+}
+
+/**
+ * @typedef {object} ListenerNode
+ * @property {Function} listener
+ * @property {1|2|3} listenerType
+ * @property {boolean} passive
+ * @property {boolean} once
+ * @property {ListenerNode|null} next
+ * @private
+ */
+
+/**
+ * @type {WeakMap<object, Map<string, ListenerNode>>}
+ * @private
+ */
+const listenersMap = new WeakMap();
+
+// Listener types
+const CAPTURE = 1;
+const BUBBLE = 2;
+const ATTRIBUTE = 3;
+
+/**
+ * Check whether a given value is an object or not.
+ * @param {any} x The value to check.
+ * @returns {boolean} `true` if the value is an object.
+ */
+function isObject(x) {
+    return x !== null && typeof x === "object" //eslint-disable-line no-restricted-syntax
+}
+
+/**
+ * Get listeners.
+ * @param {EventTarget} eventTarget The event target to get.
+ * @returns {Map<string, ListenerNode>} The listeners.
+ * @private
+ */
+function getListeners(eventTarget) {
+    const listeners = listenersMap.get(eventTarget);
+    if (listeners == null) {
+        throw new TypeError(
+            "'this' is expected an EventTarget object, but got another value."
+        )
+    }
+    return listeners
+}
+
+/**
+ * Get the property descriptor for the event attribute of a given event.
+ * @param {string} eventName The event name to get property descriptor.
+ * @returns {PropertyDescriptor} The property descriptor.
+ * @private
+ */
+function defineEventAttributeDescriptor(eventName) {
+    return {
+        get() {
+            const listeners = getListeners(this);
+            let node = listeners.get(eventName);
+            while (node != null) {
+                if (node.listenerType === ATTRIBUTE) {
+                    return node.listener
+                }
+                node = node.next;
+            }
+            return null
+        },
+
+        set(listener) {
+            if (typeof listener !== "function" && !isObject(listener)) {
+                listener = null; // eslint-disable-line no-param-reassign
+            }
+            const listeners = getListeners(this);
+
+            // Traverse to the tail while removing old value.
+            let prev = null;
+            let node = listeners.get(eventName);
+            while (node != null) {
+                if (node.listenerType === ATTRIBUTE) {
+                    // Remove old value.
+                    if (prev !== null) {
+                        prev.next = node.next;
+                    } else if (node.next !== null) {
+                        listeners.set(eventName, node.next);
+                    } else {
+                        listeners.delete(eventName);
+                    }
+                } else {
+                    prev = node;
+                }
+
+                node = node.next;
+            }
+
+            // Add new value.
+            if (listener !== null) {
+                const newNode = {
+                    listener,
+                    listenerType: ATTRIBUTE,
+                    passive: false,
+                    once: false,
+                    next: null,
+                };
+                if (prev === null) {
+                    listeners.set(eventName, newNode);
+                } else {
+                    prev.next = newNode;
+                }
+            }
+        },
+        configurable: true,
+        enumerable: true,
+    }
+}
+
+/**
+ * Define an event attribute (e.g. `eventTarget.onclick`).
+ * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.
+ * @param {string} eventName The event name to define.
+ * @returns {void}
+ */
+function defineEventAttribute(eventTargetPrototype, eventName) {
+    Object.defineProperty(
+        eventTargetPrototype,
+        `on${eventName}`,
+        defineEventAttributeDescriptor(eventName)
+    );
+}
+
+/**
+ * Define a custom EventTarget with event attributes.
+ * @param {string[]} eventNames Event names for event attributes.
+ * @returns {EventTarget} The custom EventTarget.
+ * @private
+ */
+function defineCustomEventTarget(eventNames) {
+    /** CustomEventTarget */
+    function CustomEventTarget() {
+        EventTarget.call(this);
+    }
+
+    CustomEventTarget.prototype = Object.create(EventTarget.prototype, {
+        constructor: {
+            value: CustomEventTarget,
+            configurable: true,
+            writable: true,
+        },
+    });
+
+    for (let i = 0; i < eventNames.length; ++i) {
+        defineEventAttribute(CustomEventTarget.prototype, eventNames[i]);
+    }
+
+    return CustomEventTarget
+}
+
+/**
+ * EventTarget.
+ *
+ * - This is constructor if no arguments.
+ * - This is a function which returns a CustomEventTarget constructor if there are arguments.
+ *
+ * For example:
+ *
+ *     class A extends EventTarget {}
+ *     class B extends EventTarget("message") {}
+ *     class C extends EventTarget("message", "error") {}
+ *     class D extends EventTarget(["message", "error"]) {}
+ */
+function EventTarget() {
+    /*eslint-disable consistent-return */
+    if (this instanceof EventTarget) {
+        listenersMap.set(this, new Map());
+        return
+    }
+    if (arguments.length === 1 && Array.isArray(arguments[0])) {
+        return defineCustomEventTarget(arguments[0])
+    }
+    if (arguments.length > 0) {
+        const types = new Array(arguments.length);
+        for (let i = 0; i < arguments.length; ++i) {
+            types[i] = arguments[i];
+        }
+        return defineCustomEventTarget(types)
+    }
+    throw new TypeError("Cannot call a class as a function")
+    /*eslint-enable consistent-return */
+}
+
+// Should be enumerable, but class methods are not enumerable.
+EventTarget.prototype = {
+    /**
+     * Add a given listener to this event target.
+     * @param {string} eventName The event name to add.
+     * @param {Function} listener The listener to add.
+     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.
+     * @returns {void}
+     */
+    addEventListener(eventName, listener, options) {
+        if (listener == null) {
+            return
+        }
+        if (typeof listener !== "function" && !isObject(listener)) {
+            throw new TypeError("'listener' should be a function or an object.")
+        }
+
+        const listeners = getListeners(this);
+        const optionsIsObj = isObject(options);
+        const capture = optionsIsObj
+            ? Boolean(options.capture)
+            : Boolean(options);
+        const listenerType = capture ? CAPTURE : BUBBLE;
+        const newNode = {
+            listener,
+            listenerType,
+            passive: optionsIsObj && Boolean(options.passive),
+            once: optionsIsObj && Boolean(options.once),
+            next: null,
+        };
+
+        // Set it as the first node if the first node is null.
+        let node = listeners.get(eventName);
+        if (node === undefined) {
+            listeners.set(eventName, newNode);
+            return
+        }
+
+        // Traverse to the tail while checking duplication..
+        let prev = null;
+        while (node != null) {
+            if (
+                node.listener === listener &&
+                node.listenerType === listenerType
+            ) {
+                // Should ignore duplication.
+                return
+            }
+            prev = node;
+            node = node.next;
+        }
+
+        // Add it.
+        prev.next = newNode;
+    },
+
+    /**
+     * Remove a given listener from this event target.
+     * @param {string} eventName The event name to remove.
+     * @param {Function} listener The listener to remove.
+     * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.
+     * @returns {void}
+     */
+    removeEventListener(eventName, listener, options) {
+        if (listener == null) {
+            return
+        }
+
+        const listeners = getListeners(this);
+        const capture = isObject(options)
+            ? Boolean(options.capture)
+            : Boolean(options);
+        const listenerType = capture ? CAPTURE : BUBBLE;
+
+        let prev = null;
+        let node = listeners.get(eventName);
+        while (node != null) {
+            if (
+                node.listener === listener &&
+                node.listenerType === listenerType
+            ) {
+                if (prev !== null) {
+                    prev.next = node.next;
+                } else if (node.next !== null) {
+                    listeners.set(eventName, node.next);
+                } else {
+                    listeners.delete(eventName);
+                }
+                return
+            }
+
+            prev = node;
+            node = node.next;
+        }
+    },
+
+    /**
+     * Dispatch a given event.
+     * @param {Event|{type:string}} event The event to dispatch.
+     * @returns {boolean} `false` if canceled.
+     */
+    dispatchEvent(event) {
+        if (event == null || typeof event.type !== "string") {
+            throw new TypeError('"event.type" should be a string.')
+        }
+
+        // If listeners aren't registered, terminate.
+        const listeners = getListeners(this);
+        const eventName = event.type;
+        let node = listeners.get(eventName);
+        if (node == null) {
+            return true
+        }
+
+        // Since we cannot rewrite several properties, so wrap object.
+        const wrappedEvent = wrapEvent(this, event);
+
+        // This doesn't process capturing phase and bubbling phase.
+        // This isn't participating in a tree.
+        let prev = null;
+        while (node != null) {
+            // Remove this listener if it's once
+            if (node.once) {
+                if (prev !== null) {
+                    prev.next = node.next;
+                } else if (node.next !== null) {
+                    listeners.set(eventName, node.next);
+                } else {
+                    listeners.delete(eventName);
+                }
+            } else {
+                prev = node;
+            }
+
+            // Call this listener
+            setPassiveListener(
+                wrappedEvent,
+                node.passive ? node.listener : null
+            );
+            if (typeof node.listener === "function") {
+                try {
+                    node.listener.call(this, wrappedEvent);
+                } catch (err) {
+                    if (
+                        typeof console !== "undefined" &&
+                        typeof console.error === "function"
+                    ) {
+                        console.error(err);
+                    }
+                }
+            } else if (
+                node.listenerType !== ATTRIBUTE &&
+                typeof node.listener.handleEvent === "function"
+            ) {
+                node.listener.handleEvent(wrappedEvent);
+            }
+
+            // Break if `event.stopImmediatePropagation` was called.
+            if (isStopped(wrappedEvent)) {
+                break
+            }
+
+            node = node.next;
+        }
+        setPassiveListener(wrappedEvent, null);
+        setEventPhase(wrappedEvent, 0);
+        setCurrentTarget(wrappedEvent, null);
+
+        return !wrappedEvent.defaultPrevented
+    },
+};
+
+// `constructor` is not enumerable.
+Object.defineProperty(EventTarget.prototype, "constructor", {
+    value: EventTarget,
+    configurable: true,
+    writable: true,
+});
+
+// Ensure `eventTarget instanceof window.EventTarget` is `true`.
+if (
+    typeof window !== "undefined" &&
+    typeof window.EventTarget !== "undefined"
+) {
+    Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype);
+}
+
+export default EventTarget;
+export { defineEventAttribute, EventTarget };
+//# sourceMappingURL=event-target-shim.mjs.map

node_modules/event-target-shim/index.d.ts

@@ -0,0 +1,399 @@
+export as namespace EventTargetShim
+
+/**
+ * `Event` interface.
+ * @see https://dom.spec.whatwg.org/#event
+ */
+export interface Event {
+    /**
+     * The type of this event.
+     */
+    readonly type: string
+
+    /**
+     * The target of this event.
+     */
+    readonly target: EventTarget<{}, {}, "standard"> | null
+
+    /**
+     * The current target of this event.
+     */
+    readonly currentTarget: EventTarget<{}, {}, "standard"> | null
+
+    /**
+     * The target of this event.
+     * @deprecated
+     */
+    readonly srcElement: any | null
+
+    /**
+     * The composed path of this event.
+     */
+    composedPath(): EventTarget<{}, {}, "standard">[]
+
+    /**
+     * Constant of NONE.
+     */
+    readonly NONE: number
+
+    /**
+     * Constant of CAPTURING_PHASE.
+     */
+    readonly CAPTURING_PHASE: number
+
+    /**
+     * Constant of BUBBLING_PHASE.
+     */
+    readonly BUBBLING_PHASE: number
+
+    /**
+     * Constant of AT_TARGET.
+     */
+    readonly AT_TARGET: number
+
+    /**
+     * Indicates which phase of the event flow is currently being evaluated.
+     */
+    readonly eventPhase: number
+
+    /**
+     * Stop event bubbling.
+     */
+    stopPropagation(): void
+
+    /**
+     * Stop event bubbling.
+     */
+    stopImmediatePropagation(): void
+
+    /**
+     * Initialize event.
+     * @deprecated
+     */
+    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void
+
+    /**
+     * The flag indicating bubbling.
+     */
+    readonly bubbles: boolean
+
+    /**
+     * Stop event bubbling.
+     * @deprecated
+     */
+    cancelBubble: boolean
+
+    /**
+     * Set or get cancellation flag.
+     * @deprecated
+     */
+    returnValue: boolean
+
+    /**
+     * The flag indicating whether the event can be canceled.
+     */
+    readonly cancelable: boolean
+
+    /**
+     * Cancel this event.
+     */
+    preventDefault(): void
+
+    /**
+     * The flag to indicating whether the event was canceled.
+     */
+    readonly defaultPrevented: boolean
+
+    /**
+     * The flag to indicating if event is composed.
+     */
+    readonly composed: boolean
+
+    /**
+     * Indicates whether the event was dispatched by the user agent.
+     */
+    readonly isTrusted: boolean
+
+    /**
+     * The unix time of this event.
+     */
+    readonly timeStamp: number
+}
+
+/**
+ * The constructor of `EventTarget` interface.
+ */
+export type EventTargetConstructor<
+    TEvents extends EventTarget.EventDefinition = {},
+    TEventAttributes extends EventTarget.EventDefinition = {},
+    TMode extends EventTarget.Mode = "loose"
+> = {
+    prototype: EventTarget<TEvents, TEventAttributes, TMode>
+    new(): EventTarget<TEvents, TEventAttributes, TMode>
+}
+
+/**
+ * `EventTarget` interface.
+ * @see https://dom.spec.whatwg.org/#interface-eventtarget
+ */
+export type EventTarget<
+    TEvents extends EventTarget.EventDefinition = {},
+    TEventAttributes extends EventTarget.EventDefinition = {},
+    TMode extends EventTarget.Mode = "loose"
+> = EventTarget.EventAttributes<TEventAttributes> & {
+    /**
+     * Add a given listener to this event target.
+     * @param eventName The event name to add.
+     * @param listener The listener to add.
+     * @param options The options for this listener.
+     */
+    addEventListener<TEventType extends EventTarget.EventType<TEvents, TMode>>(
+        type: TEventType,
+        listener:
+            | EventTarget.Listener<EventTarget.PickEvent<TEvents, TEventType>>
+            | null,
+        options?: boolean | EventTarget.AddOptions
+    ): void
+
+    /**
+     * Remove a given listener from this event target.
+     * @param eventName The event name to remove.
+     * @param listener The listener to remove.
+     * @param options The options for this listener.
+     */
+    removeEventListener<TEventType extends EventTarget.EventType<TEvents, TMode>>(
+        type: TEventType,
+        listener:
+            | EventTarget.Listener<EventTarget.PickEvent<TEvents, TEventType>>
+            | null,
+        options?: boolean | EventTarget.RemoveOptions
+    ): void
+
+    /**
+     * Dispatch a given event.
+     * @param event The event to dispatch.
+     * @returns `false` if canceled.
+     */
+    dispatchEvent<TEventType extends EventTarget.EventType<TEvents, TMode>>(
+        event: EventTarget.EventData<TEvents, TEventType, TMode>
+    ): boolean
+}
+
+export const EventTarget: EventTargetConstructor & {
+    /**
+     * Create an `EventTarget` instance with detailed event definition.
+     *
+     * The detailed event definition requires to use `defineEventAttribute()`
+     * function later.
+     *
+     * Unfortunately, the second type parameter `TEventAttributes` was needed
+     * because we cannot compute string literal types.
+     *
+     * @example
+     * const signal = new EventTarget<{ abort: Event }, { onabort: Event }>()
+     * defineEventAttribute(signal, "abort")
+     */
+    new <
+        TEvents extends EventTarget.EventDefinition,
+        TEventAttributes extends EventTarget.EventDefinition,
+        TMode extends EventTarget.Mode = "loose"
+    >(): EventTarget<TEvents, TEventAttributes, TMode>
+
+    /**
+     * Define an `EventTarget` constructor with attribute events and detailed event definition.
+     *
+     * Unfortunately, the second type parameter `TEventAttributes` was needed
+     * because we cannot compute string literal types.
+     *
+     * @example
+     * class AbortSignal extends EventTarget<{ abort: Event }, { onabort: Event }>("abort") {
+     *      abort(): void {}
+     * }
+     *
+     * @param events Optional event attributes (e.g. passing in `"click"` adds `onclick` to prototype).
+     */
+    <
+        TEvents extends EventTarget.EventDefinition = {},
+        TEventAttributes extends EventTarget.EventDefinition = {},
+        TMode extends EventTarget.Mode = "loose"
+    >(events: string[]): EventTargetConstructor<
+        TEvents,
+        TEventAttributes,
+        TMode
+    >
+
+    /**
+     * Define an `EventTarget` constructor with attribute events and detailed event definition.
+     *
+     * Unfortunately, the second type parameter `TEventAttributes` was needed
+     * because we cannot compute string literal types.
+     *
+     * @example
+     * class AbortSignal extends EventTarget<{ abort: Event }, { onabort: Event }>("abort") {
+     *      abort(): void {}
+     * }
+     *
+     * @param events Optional event attributes (e.g. passing in `"click"` adds `onclick` to prototype).
+     */
+    <
+        TEvents extends EventTarget.EventDefinition = {},
+        TEventAttributes extends EventTarget.EventDefinition = {},
+        TMode extends EventTarget.Mode = "loose"
+    >(event0: string, ...events: string[]): EventTargetConstructor<
+        TEvents,
+        TEventAttributes,
+        TMode
+    >
+}
+
+export namespace EventTarget {
+    /**
+     * Options of `removeEventListener()` method.
+     */
+    export interface RemoveOptions {
+        /**
+         * The flag to indicate that the listener is for the capturing phase.
+         */
+        capture?: boolean
+    }
+
+    /**
+     * Options of `addEventListener()` method.
+     */
+    export interface AddOptions extends RemoveOptions {
+        /**
+         * The flag to indicate that the listener doesn't support
+         * `event.preventDefault()` operation.
+         */
+        passive?: boolean
+        /**
+         * The flag to indicate that the listener will be removed on the first
+         * event.
+         */
+        once?: boolean
+    }
+
+    /**
+     * The type of regular listeners.
+     */
+    export interface FunctionListener<TEvent> {
+        (event: TEvent): void
+    }
+
+    /**
+     * The type of object listeners.
+     */
+    export interface ObjectListener<TEvent> {
+        handleEvent(event: TEvent): void
+    }
+
+    /**
+     * The type of listeners.
+     */
+    export type Listener<TEvent> =
+        | FunctionListener<TEvent>
+        | ObjectListener<TEvent>
+
+    /**
+     * Event definition.
+     */
+    export type EventDefinition = {
+        readonly [key: string]: Event
+    }
+
+    /**
+     * Mapped type for event attributes.
+     */
+    export type EventAttributes<TEventAttributes extends EventDefinition> = {
+        [P in keyof TEventAttributes]:
+            | FunctionListener<TEventAttributes[P]>
+            | null
+    }
+
+    /**
+     * The type of event data for `dispatchEvent()` method.
+     */
+    export type EventData<
+        TEvents extends EventDefinition,
+        TEventType extends keyof TEvents | string,
+        TMode extends Mode
+    > =
+        TEventType extends keyof TEvents
+            ? (
+                // Require properties which are not generated automatically.
+                & Pick<
+                    TEvents[TEventType],
+                    Exclude<keyof TEvents[TEventType], OmittableEventKeys>
+                >
+                // Properties which are generated automatically are optional.
+                & Partial<Pick<Event, OmittableEventKeys>>
+            )
+            : (
+                TMode extends "standard"
+                    ? Event
+                    : Event | NonStandardEvent
+            )
+
+    /**
+     * The string literal types of the properties which are generated
+     * automatically in `dispatchEvent()` method.
+     */
+    export type OmittableEventKeys = Exclude<keyof Event, "type">
+
+    /**
+     * The type of event data.
+     */
+    export type NonStandardEvent = {
+        [key: string]: any
+        type: string
+    }
+
+    /**
+     * The type of listeners.
+     */
+    export type PickEvent<
+        TEvents extends EventDefinition,
+        TEventType extends keyof TEvents | string,
+    > =
+        TEventType extends keyof TEvents
+            ? TEvents[TEventType]
+            : Event
+
+    /**
+     * Event type candidates.
+     */
+    export type EventType<
+        TEvents extends EventDefinition,
+        TMode extends Mode
+    > =
+        TMode extends "strict"
+            ? keyof TEvents
+            : keyof TEvents | string
+
+    /**
+     * - `"strict"` ..... Methods don't accept unknown events.
+     *                    `dispatchEvent()` accepts partial objects.
+     * - `"loose"` ...... Methods accept unknown events.
+     *                    `dispatchEvent()` accepts partial objects.
+     * - `"standard"` ... Methods accept unknown events.
+     *                    `dispatchEvent()` doesn't accept partial objects.
+     */
+    export type Mode = "strict" | "standard" | "loose"
+}
+
+/**
+ * Specialized `type` property.
+ */
+export type Type<T extends string> = { type: T }
+
+/**
+ * Define an event attribute (e.g. `eventTarget.onclick`).
+ * @param prototype The event target prototype to define an event attribute.
+ * @param eventName The event name to define.
+ */
+export function defineEventAttribute(
+    prototype: EventTarget,
+    eventName: string
+): void
+
+export default EventTarget

node_modules/event-target-shim/package.json

@@ -0,0 +1,113 @@
+{
+  "_args": [
+    [
+      "event-target-shim@5.0.1",
+      "C:\\Users\\matia\\Musix"
+    ]
+  ],
+  "_from": "event-target-shim@5.0.1",
+  "_id": "event-target-shim@5.0.1",
+  "_inBundle": false,
+  "_integrity": "sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ==",
+  "_location": "/event-target-shim",
+  "_optional": true,
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "version",
+    "registry": true,
+    "raw": "event-target-shim@5.0.1",
+    "name": "event-target-shim",
+    "escapedName": "event-target-shim",
+    "rawSpec": "5.0.1",
+    "saveSpec": null,
+    "fetchSpec": "5.0.1"
+  },
+  "_requiredBy": [
+    "/abort-controller"
+  ],
+  "_resolved": "https://registry.npmjs.org/event-target-shim/-/event-target-shim-5.0.1.tgz",
+  "_spec": "5.0.1",
+  "_where": "C:\\Users\\matia\\Musix",
+  "author": {
+    "name": "Toru Nagashima"
+  },
+  "bugs": {
+    "url": "https://github.com/mysticatea/event-target-shim/issues"
+  },
+  "description": "An implementation of WHATWG EventTarget interface.",
+  "devDependencies": {
+    "@babel/core": "^7.2.2",
+    "@babel/plugin-transform-modules-commonjs": "^7.2.0",
+    "@babel/preset-env": "^7.2.3",
+    "@babel/register": "^7.0.0",
+    "@mysticatea/eslint-plugin": "^8.0.1",
+    "@mysticatea/spy": "^0.1.2",
+    "assert": "^1.4.1",
+    "codecov": "^3.1.0",
+    "eslint": "^5.12.1",
+    "karma": "^3.1.4",
+    "karma-chrome-launcher": "^2.2.0",
+    "karma-coverage": "^1.1.2",
+    "karma-firefox-launcher": "^1.0.0",
+    "karma-growl-reporter": "^1.0.0",
+    "karma-ie-launcher": "^1.0.0",
+    "karma-mocha": "^1.3.0",
+    "karma-rollup-preprocessor": "^7.0.0-rc.2",
+    "mocha": "^5.2.0",
+    "npm-run-all": "^4.1.5",
+    "nyc": "^13.1.0",
+    "opener": "^1.5.1",
+    "rimraf": "^2.6.3",
+    "rollup": "^1.1.1",
+    "rollup-plugin-babel": "^4.3.2",
+    "rollup-plugin-babel-minify": "^7.0.0",
+    "rollup-plugin-commonjs": "^9.2.0",
+    "rollup-plugin-json": "^3.1.0",
+    "rollup-plugin-node-resolve": "^4.0.0",
+    "rollup-watch": "^4.3.1",
+    "type-tester": "^1.0.0",
+    "typescript": "^3.2.4"
+  },
+  "engines": {
+    "node": ">=6"
+  },
+  "files": [
+    "dist",
+    "index.d.ts"
+  ],
+  "homepage": "https://github.com/mysticatea/event-target-shim",
+  "keywords": [
+    "w3c",
+    "whatwg",
+    "eventtarget",
+    "event",
+    "events",
+    "shim"
+  ],
+  "license": "MIT",
+  "main": "dist/event-target-shim",
+  "name": "event-target-shim",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mysticatea/event-target-shim.git"
+  },
+  "scripts": {
+    "build": "rollup -c scripts/rollup.config.js",
+    "clean": "rimraf .nyc_output coverage",
+    "codecov": "codecov",
+    "coverage": "nyc report --reporter lcov && opener coverage/lcov-report/index.html",
+    "lint": "eslint src test scripts --ext .js,.mjs",
+    "postversion": "git push && git push --tags",
+    "pretest": "npm run lint",
+    "preversion": "npm test",
+    "test": "run-s test:*",
+    "test:karma": "karma start scripts/karma.conf.js --single-run",
+    "test:mocha": "nyc --require ./scripts/babel-register mocha test/*.mjs",
+    "version": "npm run build && git add dist/*",
+    "watch": "run-p watch:*",
+    "watch:karma": "karma start scripts/karma.conf.js --watch",
+    "watch:mocha": "mocha test/*.mjs --require ./scripts/babel-register --watch --watch-extensions js,mjs --growl"
+  },
+  "types": "index.d.ts",
+  "version": "5.0.1"
+}