3.ts

class Account {
  constructor(protected accountId: string) {}

  public async addEvent(event: Event) {
    return firestore()
      .collection("accounts")
      .doc(this.accountId)
      .collection("events")
      .add({
        name: event.getName(),
        payload: event.getPayload(),
        isCritical: event.isCritical(),
        createdAt: firestore.FieldValue.serverTimestamp(),
      });
  }
}