get(key) {
    if (!this.settingConfigs[key])
      throw new Error(`Invalid runtime setting: ${key}`);
    return this.settings.hasOwnProperty(key)
      ? this.settings[key]
      : this.settingConfigs[key].default;
  }
Get a runtime setting
- Will throw an error if the setting requested is not a supported runtime setting key
- Will return the default value if the setting requested is not set at all
@param {string} key
@returns {any}