emaui/node_modules/@rspack/core/hot/emitter.js

function EventEmitter() {
	this.events = {};
}

EventEmitter.prototype.on = function (eventName, callback) {
	if (!this.events[eventName]) {
		this.events[eventName] = [];
	}
	this.events[eventName].push(callback);
};

EventEmitter.prototype.emit = function (eventName) {
	var args = Array.prototype.slice.call(arguments, 1);
	if (this.events[eventName]) {
		this.events[eventName].forEach(function (callback) {
			callback.apply(null, args);
		});
	}
};

module.exports = new EventEmitter();