Method persistSync

src/telemetry/index.ts:387–396

* Synchronous, tiny, exit-safe: drain in-memory deltas to the JSONL queue. * Runs on `process.on('exit')`, so it must never be async or slow.

()

   * Runs on `process.on('exit')`, so it must never be async or slow.
   */
  persistSync(): void {
    if (this.counts.size === 0 && this.events.length === 0) return;
    const lines: BufferLine[] = [...this.counts.values(), ...this.events];
    this.counts.clear();
    this.events = [];
    // Re-check at persist time: `codegraph telemetry off` mid-process must not
    // have its own invocation resurrect the queue file at exit.
    if (!this.isEnabled()) return;
    this.appendLines(lines);
  }

  private appendLines(lines: BufferLine[]): void {
    try {