Copy demo code over to auth-compat-layer, fix our build scripts

packages-exp/auth-compat-exp/demo/.eslintrc.js

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+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * 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.
+ */
+
+module.exports = {
+  extends: '../../../config/.eslintrc.js',
+  parserOptions: {
+    project: 'tsconfig.json',
+    // to make vscode-eslint work with monorepo
+    // https://github.com/typescript-eslint/typescript-eslint/issues/251#issuecomment-463943250
+    tsconfigRootDir: __dirname
+  },
+  rules: {
+    'import/no-extraneous-dependencies': ['error', { 'devDependencies': true }]
+  }
+};

packages-exp/auth-compat-exp/demo/.firebaserc

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+{
+  "projects": {
+    "avolkovi-auth": "avolkovi-auth"
+  }
+}

packages-exp/auth-compat-exp/demo/.gitignore

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+src/config.js
+.firebaserc
+public/config.js
+public/service-worker.*
+public/web-worker.*
+public/index.*

packages-exp/auth-compat-exp/demo/README.md

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+# Firebase-Auth for web - Auth Demo (Auth Compatibility Layer)
+
+## Prerequisite
+
+You need to have created a Firebase Project in the
+[Firebase Console](https://firebase.google.com/console/) as well as configured a web app.
+
+## Installation
+Make sure you run `yarn` to install all dependencies in the root directory.
+
+Enable the Auth providers you would like to offer your users in the console, under
+Auth > Sign-in methods.
+
+Run:
+
+```bash
+git clone https://github.com/firebase/firebase-js-sdk.git
+cd firebase-js-sdk/packages-exp/auth-compat-exp/demo
+```
+
+This will clone the repository in the current directory.
+
+If you want to be able to deploy the demo app to one of your own Firebase Hosting instance,
+configure it using the following command:
+
+```bash
+firebase use --add
+```
+
+Select the project you have created in the prerequisite, and type in `default` or
+any other name as the alias to use for this project.
+
+Copy `public/sample-config.js` to `public/config.js`:
+
+```bash
+cp public/sample-config.js public/config.js
+```
+
+Then copy and paste the Web snippet config found in the console (either by clicking "Add Firebase to
+your web app" button in your Project overview, or clicking the "Web setup" button in the Auth page)
+in the `config.js` file.
+
+In the `functions` folder you'll need to install the admin SDK:
+
+```bash
+cd functions
+yarn install
+```
+
+## Deploy
+
+Before deploying, you may need to build the auth-exp package:
+```bash
+yarn build:deps
+```
+
+You'll also need to build a fully resolved firebase-app.js and firebase-auth.js from auth-compat-exp:
+
+```bash
+yarn build
+```
+
+This can take some time, and you only need to do it if you've modified the auth-exp or auth-compta-exp packages.
+
+To run the app locally, simply issue the following command in the `auth-compat-exp/demo` directory:
+
+```bash
+yarn run demo
+```
+
+This will compile all the files needed to run Firebase Auth, and start a Firebase server locally at
+[http://localhost:5000](http://localhost:5000).
+

packages-exp/auth-compat-exp/demo/database.rules.json

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+{
+  "rules": {
+    ".read": "auth != null",
+    ".write": "auth != null",
+    "users": {
+      "$user_id": {
+        ".read": "$user_id === auth.uid",
+        ".write": "$user_id === auth.uid"
+      }
+    }
+  }
+}
+

packages-exp/auth-compat-exp/demo/firebase.json

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+{
+  "database": {
+    "rules": "database.rules.json"
+  },
+  "hosting": {
+    "public": "public",
+    "rewrites": [
+      {
+        "source": "/checkIfAuthenticated",
+        "function": "checkIfAuthenticated"
+      }
+    ]
+  }
+}

packages-exp/auth-compat-exp/demo/functions/index.js

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+/**
+ * @license
+ * Copyright 2018 Google LLC
+ *
+ * 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.
+ */
+
+/**
+ * @fileoverview Defines the HTTP endpoints hosted via firebase functions which
+ * are used to test service worker functionality for Firebase Auth via demo
+ * app.
+ */
+
+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+
+admin.initializeApp(functions.config().firebase);
+
+exports.checkIfAuthenticated = functions.https.onRequest((req, res) => {
+  const idToken = req.get('x-id-token');
+  res.setHeader('Content-Type', 'application/json');
+  if (idToken) {
+    admin
+      .auth()
+      .verifyIdToken(idToken)
+      .then(decodedIdToken => {
+        res.status(200).send(JSON.stringify({ uid: decodedIdToken.sub }));
+      })
+      .catch(error => {
+        res.status(400).send(JSON.stringify({ error: error.code }));
+      });
+  } else {
+    res.status(403).send(JSON.stringify({ error: 'Unauthorized access' }));
+  }
+});

packages-exp/auth-compat-exp/demo/functions/package.json

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+{
+  "name": "functions",
+  "description": "Cloud Functions for Firebase",
+  "scripts": {
+    "serve": "firebase serve --only functions",
+    "shell": "firebase experimental:functions:shell",
+    "start": "yarn shell",
+    "deploy": "firebase deploy --only functions",
+    "logs": "firebase functions:log"
+  },
+  "dependencies": {
+    "firebase-admin": "8.11.0",
+    "firebase-functions": "3.6.1"
+  },
+  "private": true
+}