Method fetch

scripts/sync/cache.ts:26–34

(url: string)

  constructor(private cacheDir: string) {}

  async fetch(url: string): Promise<string> {
    return this.cached(url, async () => {
      const response = await fetch(url);
      if (!response.ok) {
        throw new Error(`HTTP ${response.status} ${response.statusText}`);
      }
      return response.text();
    });
  }

  async cached(key: string, fresh: () => Promise<string>): Promise<string> {
    this.usedKeys.add(this.cacheKey(key));