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A feature-rich Node.js event emitter implementation with namespaces, wildcards, TTL, async listeners and browser/worker support.
huangzhang修改源码，只导出 cjs 格式。
因为系统中如果额外使用了 systemjs 来加载 umd 模块，systemjs 会往 window 上挂 define 方法，[email protected] 版本源码会先判断存在 define 方法就执行 amd 导出方式，就导致项目中使用 import e from 'eventemitter2' 拿到一个空对象。
