let subscribers={};function subscribe(eventName,callback){return subscribers[eventName]===void 0&&(subscribers[eventName]=[]),subscribers[eventName]=[...subscribers[eventName],callback],function(){subscribers[eventName]=subscribers[eventName].filter(cb=>cb!==callback)}}function publish(eventName,data){if(subscribers[eventName]){const promises=subscribers[eventName].map(callback=>callback(data));return Promise.all(promises)}else return Promise.resolve()}
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