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

if (!projectId) {
            throw ERROR_FACTORY.create("registration-project-id" /* REGISTRATION_PROJECT_ID */);
        }
        if (!apiKey) {
            throw ERROR_FACTORY.create("registration-api-key" /* REGISTRATION_API_KEY */);
        }
        if (!appId) {
            throw ERROR_FACTORY.create("registration-app-id" /* REGISTRATION_APP_ID */);
        }
        namespace = namespace || 'firebase';
        var storage = new Storage(appId, app.name, namespace);
        var storageCache = new StorageCache(storage);
        var logger$1 = new logger.Logger(name);
        // Sets ERROR as the default log level.
        // See RemoteConfig#setLogLevel for corresponding normalization to ERROR log level.
        logger$1.logLevel = logger.LogLevel.ERROR;
        var restClient = new RestClient(installations, 
        // Uses the JS SDK version, by which the RC package version can be deduced, if necessary.
        firebaseInstance.SDK_VERSION, namespace, projectId, apiKey, appId);
        var retryingClient = new RetryingClient(restClient, storage);
        var cachingClient = new CachingClient(retryingClient, storage, storageCache, logger$1);
        var remoteConfigInstance = new RemoteConfig(app, cachingClient, storageCache, storage, logger$1);
        // Starts warming cache.
        // eslint-disable-next-line @typescript-eslint/no-floating-promises
        remoteConfigInstance.ensureInitialized();
        return remoteConfigInstance;
    }
}

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

* Copyright 2019 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var consoleLogger = new logger$1.Logger(SERVICE_NAME);
consoleLogger.logLevel = logger$1.LogLevel.INFO;

/**
 * @license
 * Copyright 2019 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.

* Copyright 2019 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var consoleLogger = new logger$1.Logger(SERVICE_NAME);
consoleLogger.logLevel = logger$1.LogLevel.INFO;

/**
 * @license
 * Copyright 2019 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.