Method saveFile

packages/varlock/src/lib/cache/cache-store.ts:403–415

Throws on failure — callers decide whether a failed write is fatal.

(data: CacheData)

  /** Throws on failure — callers decide whether a failed write is fatal. */
  private saveFile(data: CacheData): void {
    // atomic write: exclusively create a temp file then rename over the target
    const tmpPath = `${this.filePath}.tmp.${process.pid}.${randomBytes(4).toString('hex')}`;
    fs.writeFileSync(tmpPath, JSON.stringify(data, null, 2), { encoding: 'utf-8', mode: 0o600, flag: 'wx' });
    try {
      fs.renameSync(tmpPath, this.filePath);
    } catch (err) {
      fs.rmSync(tmpPath, { force: true });
      throw err;
    }
    // explicit chmod in case rename preserved an existing file's mode
    fs.chmodSync(this.filePath, 0o600);
  }

  private pruneExpired(data: CacheData): CacheData {
    const now = Date.now();