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

/** An append-only log of timestamped events. */
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.
   * @param timestamp - The timestamp to filter events from.
   * @returns An array of events that occurred at or after the given timestamp.
   */
  since(timestamp: number): Event[] {
    return this.#events.filter((event) => event.timestamp >= timestamp);
  }
}
```