simplest way to use event emitter in ES6

This is my current implementation of an event emitter.

class Table {

  set onDiscard(cb) {
    this._onDiscard = cb;
  }

  notifyDiscard(s) {
    if (this._onDiscard) {
      this._onDiscard(s);
    }
  }
}

In the case of having multiple events this gets a burden.

What library/feature/implementation can I use so I can simplify this to a single line.