# All files / helpers extract-app-config.ts

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     /**
     * @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.
     */

    import { FirebaseApp } from '@firebase/app-types';
    import { AppConfig } from '../interfaces/app-config';
    import { ERROR_FACTORY, ErrorCode } from '../util/errors';

    export function extractAppConfig(app: FirebaseApp): AppConfig {
      if (!app || !app.options) {
        throw ERROR_FACTORY.create(ErrorCode.MISSING_APP_CONFIG_VALUES);
      }

      const appName = app.name;
      const { projectId, apiKey, appId } = app.options;

      if (!appName || !projectId || !apiKey || !appId) {
        throw ERROR_FACTORY.create(ErrorCode.MISSING_APP_CONFIG_VALUES);
      }

      return { appName, projectId, apiKey, appId };
    }