Method _get

src/pkg/config/config.ts:147–168

(
    key: SystemConfigKey,
    defaultValue: WithAsyncValue<Exclude<T, undefined>>
  )

  }

  private _get<T extends string | number | boolean | object>(
    key: SystemConfigKey,
    defaultValue: WithAsyncValue<Exclude<T, undefined>>
  ): Promise<T> {
    if (this.cache.has(key)) {
      const val = this.cache.get(key);
      return Promise.resolve(val === undefined ? this.resolveDefault<T>(defaultValue) : (val as T));
    }
    const storage = this.getStorage(key);
    return storage.get(key).then((val) => {
      if (val !== undefined) {
        this.cache.set(key, val);
        return val as T;
      }
      // 对 local key，回退读取 sync storage（兼容旧版本数据迁移）
      if (this.isLocalKey(key)) {
        return this.transferSyncToLocal<T>(key, defaultValue);
      }
      this.cache.set(key, val);
      return this.resolveDefault<T>(defaultValue);
    });
  }

  public get<T extends SystemConfigKey>(key: T): Promise<SystemConfigValueType<T>> {
    const funcName = `get${toCamelCase(key)}`;