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eventEmitter.js
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45 lines (45 loc) · 1.33 KB
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wrap(() => {
function eventEmitter() {
const events = {
// eventName: [events]
};
return {
on: function (event, fn) {
if (typeof fn !== "function") return eventManager;
event.split(' ').forEach((e) => {
if (!events.hasOwnProperty(e)) {
events[e] = [];
}
events[e].push(fn);
});
return eventManager;
},
emit: function (event, data, cancelable = false) {
const lEvents = events[event];
let ran = false;
let canceled = false;
if (Array.isArray(lEvents) && lEvents.length) {
ran = true;
lEvents.forEach(function call(ev) {
// Should we stop processing on cancel? Probably.
try {
const meta = { event, cancelable, canceled };
ev.call(meta, data);
canceled = !!meta.canceled;
} catch (e) {
console.error(`Error occurred while parsing event: ${ev.displayName || ev.name || 'unnamed'}(${event})`, e, data);
}
});
}
return {
ran,
canceled: cancelable && canceled
};
},
emitJSON: function (event, data, cancelable) {
return this.emit(event, JSON.parse(data), cancelable);
},
};
}
fn.eventEmitter = eventEmitter;
});