Method startRecursive

src/sync/watcher.ts:438–454

* macOS/Windows: one recursive watcher for the whole tree. O(1) descriptors. * `filename` arrives relative to the project root (with subdirectories), so * it maps straight to a project-relative path.

()

   * it maps straight to a project-relative path.
   */
  private startRecursive(): void {
    this.recursiveWatcher = watchImpl(
      this.projectRoot,
      { recursive: true, persistent: true },
      (_event, filename) => {
        if (this.stopped || filename == null) return;
        this.handleChange(normalizePath(String(filename)));
      }
    );
    this.recursiveWatcher.on('error', (err: unknown) => {
      if (isWatchResourceExhaustion(err)) {
        this.degrade(EXHAUSTION_REASON, { error: String(err) });
        return;
      }
      logWarn('File watcher error', { error: String(err) });
    });
  }

  /**
   * Linux: walk the (non-ignored) tree and watch each directory. One inotify