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next.js/lib/EventEmitter.js

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export default class EventEmitter {
listeners = {}
on (event, cb) {
if (!this.listeners[event]) {
this.listeners[event] = new Set()
}
this.listeners[event].add(cb)
}
emit (event, ...data) {
if (!this.listeners[event]) return
this.listeners[event].forEach(cb => cb(...data))
}
off (event, cb) {
if (!this.listeners[event]) return
this.listeners[event].delete(cb)
}
}