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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.

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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.

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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

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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.
*/
/**
* @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

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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

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{
"name": "event-target-shim",
"version": "5.0.1",
"description": "An implementation of WHATWG EventTarget interface.",
"main": "dist/event-target-shim",
"types": "index.d.ts",
"files": [
"dist",
"index.d.ts"
],
"engines": {
"node": ">=6"
},
"scripts": {
"preversion": "npm test",
"version": "npm run build && git add dist/*",
"postversion": "git push && git push --tags",
"clean": "rimraf .nyc_output coverage",
"coverage": "nyc report --reporter lcov && opener coverage/lcov-report/index.html",
"lint": "eslint src test scripts --ext .js,.mjs",
"build": "rollup -c scripts/rollup.config.js",
"pretest": "npm run lint",
"test": "run-s test:*",
"test:mocha": "nyc --require ./scripts/babel-register mocha test/*.mjs",
"test:karma": "karma start scripts/karma.conf.js --single-run",
"watch": "run-p watch:*",
"watch:mocha": "mocha test/*.mjs --require ./scripts/babel-register --watch --watch-extensions js,mjs --growl",
"watch:karma": "karma start scripts/karma.conf.js --watch",
"codecov": "codecov"
},
"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"
},
"repository": {
"type": "git",
"url": "https://github.com/mysticatea/event-target-shim.git"
},
"keywords": [
"w3c",
"whatwg",
"eventtarget",
"event",
"events",
"shim"
],
"author": "Toru Nagashima",
"license": "MIT",
"bugs": {
"url": "https://github.com/mysticatea/event-target-shim/issues"
},
"homepage": "https://github.com/mysticatea/event-target-shim"
}