Spaces:
Sleeping
Sleeping
File size: 973 Bytes
7aec436 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 |
// Browser support for EventTarget constructor is surprisingly poor, so we always polyfill it
// We also need to polyfill CustomEvent for Node.js
class EventTargetShim {
constructor () {
this._events = {};
}
addEventListener (event, handler) {
if (!this._events[event]) {
this._events[event] = [];
}
this._events[event].push(handler);
}
removeEventListener (event, handler) {
const handlers = this._events[event];
if (handlers) {
this._events[event] = handlers.filter(i => i !== handler);
}
}
dispatchEvent (event) {
const handlers = this._events[event.type];
if (handlers) {
for (const fn of handlers) {
fn(event);
}
}
}
}
class CustomEventShim {
constructor (type, options) {
this.type = type;
this.detail = options ? options.detail : {};
}
}
export {
EventTargetShim as EventTarget,
CustomEventShim as CustomEvent
};
|