```typescript

/** An append-only log of timestamped events. */
export class EventLog {
  #events: Array<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): Array<Event> {
    return this.#events.filter((event) => event.timestamp >= timestamp);
  }
}

export interface Event { name: string; timestamp: number }
```