@microsoft/teams.common/dist/events/event-emitter.mjs

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class EventEmitter {
  index = -1;
  subscriptions = /* @__PURE__ */ new Map();
  on(event, handler) {
    const id = ++this.index;
    const subs = this.subscriptions.get(event) || [];
    subs.push({ id, handler });
    this.subscriptions.set(event, subs);
    return id;
  }
  once(event, handler) {
    const id = this.on(event, (value) => {
      this.off(id);
      handler(value);
    });
    return id;
  }
  off(id) {
    for (const [_, subs] of this.subscriptions.entries()) {
      const i = subs.findIndex((s) => s.id === id);
      if (i === -1) continue;
      subs.splice(i, 1);
      return;
    }
  }
  emit(event, value) {
    const subs = this.subscriptions.get(event) || [];
    for (const sub of subs) {
      sub.handler(value);
    }
  }
}

export { EventEmitter };
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