Migrate auth to component

Author: Feiyang1

packages/auth-interop-types/README.md

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+# @firebase/auth-interop-types
+
+**This package is not intended for direct usage, and should only be used via the officially supported [firebase](https://www.npmjs.com/package/firebase) package.**

packages/auth-interop-types/index.d.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.
+ */
+
+export interface FirebaseAuthTokenData {
+  accessToken: string;
+}
+
+export interface FirebaseAuthInternal {
+  getToken(refreshToken?: boolean): Promise<FirebaseAuthTokenData | null>;
+  getUid(): string | null;
+  addAuthTokenListener(fn: (token: string | null) => void): void;
+  removeAuthTokenListener(fn: (token: string | null) => void): void;
+}
+
+declare module '@firebase/component' {
+  interface ComponentContainer {
+    getProvider(name: 'auth-interop'): Provider<FirebaseAuthInternal>;
+  }
+
+  interface Provider<T> {
+
+  }
+}

packages/auth-interop-types/package.json

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+{
+  "name": "@firebase/auth-interop-types",
+  "version": "0.1.0",
+  "description": "@firebase/auth interop Types",
+  "author": "Firebase <[email protected]> (https://firebase.google.com/)",
+  "license": "Apache-2.0",
+  "scripts": {
+    "test": "tsc"
+  },
+  "files": [
+    "index.d.ts"
+  ],
+  "peerDependencies": {
+    "@firebase/app-types": "0.x",
+    "@firebase/util": "0.x"
+  },
+  "repository": {
+    "directory": "packages/auth-types",
+    "type": "git",
+    "url": "https://github.com/firebase/firebase-js-sdk.git"
+  },
+  "bugs": {
+    "url": "https://github.com/firebase/firebase-js-sdk/issues"
+  },
+  "devDependencies": {
+    "typescript": "3.6.4"
+  }
+}

packages/auth-interop-types/tsconfig.json

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+{
+  "extends": "../../config/tsconfig.base.json",
+  "compilerOptions": {
+    "noEmit": true
+  },
+  "exclude": [
+    "dist/**/*"
+  ]
+}