Method withLock

src/runtime/config.ts:408–415

(fn: (current: string | undefined) => LockResult<T>)

      fs.writeFileSync(this.configPath, JSON.stringify(config, null, 2), "utf-8");
    } catch {
      // If config.json is unreadable, write a minimal file
      const config = { _auth: JSON.parse(authJson) };
      fs.writeFileSync(this.configPath, JSON.stringify(config, null, 2), "utf-8");
    }
  }

  withLock<T>(fn: (current: string | undefined) => LockResult<T>): T {
    const current = this.readAuthJson();
    const { result, next } = fn(current);
    if (next !== undefined) {
      this.writeAuthJson(next);