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node-ponyfill.js
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/
node-ponyfill.js
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module.exports.Event = globalThis.Event;
if (!module.exports.Event) {
module.exports.Event = class Event {
constructor(type, options) {
this.bubbles = !!options && !!options.bubbles;
this.cancelable = !!options && !!options.cancelable;
this.composed = !!options && !!options.composed;
this.type = type;
}
}
}
module.exports.EventTarget = globalThis.EventTarget;
if (!module.exports.EventTarget) {
module.exports.EventTarget = class EventTarget {
constructor() {
this.__listeners = new Map();
}
addEventListener(type, listener, options) { if (arguments.length < 2) {
throw new TypeError(
`TypeError: Failed to execute 'addEventListener' on 'EventTarget': 2 arguments required, but only ${arguments.length} present.`
);
}
const __listeners = this.__listeners;
const actualType = type.toString();
if (!__listeners.has(actualType)) {
__listeners.set(actualType, new Map());
}
const listenersForType = __listeners.get(actualType);
if (!listenersForType.has(listener)) {
// Any given listener is only registered once
listenersForType.set(listener, options);
}
}
removeEventListener(type, listener, _options) {
if (arguments.length < 2) {
throw new TypeError(
`TypeError: Failed to execute 'addEventListener' on 'EventTarget': 2 arguments required, but only ${arguments.length} present.`
);
}
const __listeners = this.__listeners;
const actualType = type.toString();
if (__listeners.has(actualType)) {
const listenersForType = __listeners.get(actualType);
if (listenersForType.has(listener)) {
listenersForType.delete(listener);
}
}
}
dispatchEvent(event) {
if (!(event instanceof Event)) {
throw new TypeError(
`Failed to execute 'dispatchEvent' on 'EventTarget': parameter 1 is not of type 'Event'.`
);
}
const type = event.type;
const __listeners = this.__listeners;
const listenersForType = __listeners.get(type);
if (listenersForType) {
for (const [listener, options] of listenersForType.entries()) {
try {
if (typeof listener === "function") {
// Listener functions must be executed with the EventTarget as the `this` context.
listener.call(this, event);
} else if (listener && typeof listener.handleEvent === "function") {
// Listener objects have their handleEvent method called, if they have one
listener.handleEvent(event);
}
} catch (err) {
// We need to report the error to the global error handling event,
// but we do not want to break the loop that is executing the events.
// Unfortunately, this is the best we can do, which isn't great, because the
// native EventTarget will actually do this synchronously before moving to the next
// event in the loop.
setTimeout(() => {
throw err;
});
}
if (options && options.once) {
// If this was registered with { once: true }, we need
// to remove it now.
listenersForType.delete(listener);
}
}
}
// Since there are no cancellable events on a base EventTarget,
// this should always return true.
return true;
}
}
}
module.exports.CustomEvent = globalThis.CustomEvent;
if (!module.exports.CustomEvent) {
module.exports.CustomEvent = class CustomEvent extends module.exports.Event {
constructor(type, options) {
super(type, options);
this.detail = options && options.detail;
}
}
}