How to use the @firebase/logger.LogLevel.SILENT function in @firebase/logger

setLogLevel(logLevel: RemoteConfigLogLevel): void {
    switch (logLevel) {
      case 'debug':
        this._logger.logLevel = FirebaseLogLevel.DEBUG;
        break;
      case 'silent':
        this._logger.logLevel = FirebaseLogLevel.SILENT;
        break;
      default:
        this._logger.logLevel = FirebaseLogLevel.ERROR;
    }
  }

export function getLogLevel(): LogLevel {
  if (logClient.logLevel === FirebaseLogLevel.DEBUG) {
    return LogLevel.DEBUG;
  } else if (logClient.logLevel === FirebaseLogLevel.SILENT) {
    return LogLevel.SILENT;
  } else {
    return LogLevel.ERROR;
  }
}
export function setLogLevel(newLevel: LogLevel): void {

setLogLevel(logLevel) {
        switch (logLevel) {
            case 'debug':
                this._logger.logLevel = LogLevel.DEBUG;
                break;
            case 'silent':
                this._logger.logLevel = LogLevel.SILENT;
                break;
            default:
                this._logger.logLevel = LogLevel.ERROR;
        }
    }
    get fetchTimeMillis() {

RemoteConfig.prototype.setLogLevel = function (logLevel) {
        switch (logLevel) {
            case 'debug':
                this._logger.logLevel = LogLevel.DEBUG;
                break;
            case 'silent':
                this._logger.logLevel = LogLevel.SILENT;
                break;
            default:
                this._logger.logLevel = LogLevel.ERROR;
        }
    };
    Object.defineProperty(RemoteConfig.prototype, "fetchTimeMillis", {

export function setLogLevel(newLevel: LogLevel): void {
  /**
   * Map the new log level to the associated Firebase Log Level
   */
  switch (newLevel) {
    case LogLevel.DEBUG:
      logClient.logLevel = FirebaseLogLevel.DEBUG;
      break;
    case LogLevel.ERROR:
      logClient.logLevel = FirebaseLogLevel.ERROR;
      break;
    case LogLevel.SILENT:
      logClient.logLevel = FirebaseLogLevel.SILENT;
      break;
    default:
      logClient.error(
        `Firestore (${SDK_VERSION}): Invalid value passed to \`setLogLevel\``
      );
  }
}