```typescript
/** An append-only log of timestamped events. */
export interface Event { 
  name: string; 
  timestamp: number; 
}

export class EventLog {
  
  #events: Event[] = [];

  /** Append one event. */
  record(event: Event): void { 
    this.#events.push(event); 
  }

  /** Every event at or after the given timestamp, in insertion order. */
  since(timestamp: number): Event[] { 
    return [...this.#events.filter((event) => event.timestamp >= timestamp)]; 
  }
}
```