having one solution for different components of app

serverless/functions/.eslintrc.js

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+module.exports = {
+  root: true,
+  env: {
+    es6: true,
+    node: true,
+  },
+  extends: [
+    // "eslint:recommended",
+    // "plugin:import/errors",
+    // "plugin:import/warnings",
+    // "plugin:import/typescript",
+    // "google",
+    // "plugin:@typescript-eslint/recommended",
+
+    "eslint:recommended",
+    "plugin:import/errors",
+    "plugin:import/warnings",
+    "plugin:import/typescript",
+  ],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    project: ["tsconfig.json", "tsconfig.dev.json"],
+    sourceType: "module",
+    tsconfigRootDir: __dirname,
+  },
+  ignorePatterns: [
+    "/lib/**/*", // Ignore built files.
+  ],
+  plugins: ["@typescript-eslint", "import"],
+  rules: {
+    quotes: ["error", "double"],
+    // "import/no-unresolved": 0,
+  },
+};

serverless/functions/.gitignore

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+# Compiled JavaScript files
+lib/**/*.js
+lib/**/*.js.map
+
+# TypeScript v1 declaration files
+typings/
+
+# Node.js dependency directory
+node_modules/

serverless/functions/package.json

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+{
+  "name": "functions",
+  "scripts": {
+    "lint": "eslint --ext .js,.ts .",
+    "build": "npm run lint && tsc",
+    "serve": "npm run build && firebase emulators:start --only functions & tsc --watch",
+    "shell": "npm run build && firebase functions:shell",
+    "start": "npm run shell",
+    "deploy": "firebase deploy --only functions",
+    "logs": "firebase functions:log",
+    "hotReload": "tsc --watch"
+  },
+  "engines": {
+    "node": "16"
+  },
+  "main": "lib/index.js",
+  "dependencies": {
+    "agora-access-token": "^2.0.4",
+    "firebase-admin": "^9.8.0",
+    "firebase-functions": "^3.14.1"
+  },
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^3.9.1",
+    "@typescript-eslint/parser": "^3.8.0",
+    "eslint": "^7.6.0",
+    "eslint-config-google": "^0.14.0",
+    "eslint-plugin-import": "^2.22.0",
+    "firebase-functions-test": "^0.2.0",
+    "typescript": "^3.8.0"
+  },
+  "private": true
+}

serverless/functions/src/agora.ts

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+import * as functions from "firebase-functions";
+import * as admin from "firebase-admin";
+admin.initializeApp();
+
+// exports.agoraToken = functions.https.onCall((data, context) => {
+//   console.log(data);
+
+//   console.log("user's id: " + context.auth?.uid);
+//   const channelName = data.channelName;
+
+//   const token = agora.getAgoraToken(channelName);
+
+//   return {token};
+// });
+
+export const agoraToken = functions.https.onCall((data, context) => {
+  console.log(data);
+
+  console.log("user's id: " + context.auth?.uid);
+  const channelName: string = data.channelName;
+
+  let token = getAgoraToken(channelName);
+
+  return { token };
+});
+
+import { RtcTokenBuilder, RtcRole } from "agora-access-token";
+
+function getAgoraToken(channelName: string) {
+  // Rtc Examples
+  const appID = "c8dfd65deb5c4741bd564085627139d0";
+  const appCertificate = "aa57b809934b4efcb407cf30089d9f25";
+  const uid = 0; // no need to use this as we have authenticated this user
+  const role = RtcRole.PUBLISHER;
+
+  const expirationTimeInSeconds = 3600;
+
+  const currentTimestamp = Math.floor(Date.now() / 1000);
+
+  const privilegeExpiredTs = currentTimestamp + expirationTimeInSeconds;
+
+  // IMPORTANT! Build token with either the uid or with the user account. Comment out the option you do not want to use below.
+
+  // Build token with uid
+  const tokenA = RtcTokenBuilder.buildTokenWithUid(
+    appID,
+    appCertificate,
+    channelName,
+    uid,
+    role,
+    privilegeExpiredTs
+  );
+  console.log("Token With Integer Number Uid: " + tokenA);
+
+  return tokenA;
+}

serverless/functions/src/index.ts

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+import * as functions from "firebase-functions";
+import * as admin from "firebase-admin";
+
+admin.initializeApp();
+
+// // Start writing Firebase Functions
+// // https://firebase.google.com/docs/functions/typescript
+//
+export const helloWorld = functions.https.onRequest((request, response) => {
+  functions.logger.info("Hello no!", { structuredData: true });
+  response.send("Hello from woahhhhhh!");
+});
+
+import { agoraToken } from "./agora";
+exports.agoraToken = agoraToken;

serverless/functions/src/notifications.ts

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+// import * as functions from "firebase-functions";
+
+// exports.inviteUserToTeam = functions.firestore
+//     .document('teamMembers/{userId}')
+//     .onCreate((snap, context) => {
+//       // Get an object representing the document
+//       // e.g. {'name': 'Marie', 'age': 66}
+//       const newValue = snap.data();
+
+//       // access a particular field as you would any JS property
+//       const name = newValue.name;
+
+//       // perform desired operations ...
+//     });

serverless/functions/tsconfig.dev.json

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+{
+  "include": [".eslintrc.js"]
+}

serverless/functions/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "noImplicitReturns": true,
+    "noUnusedLocals": true,
+    "outDir": "lib",
+    "sourceMap": true,
+    "strict": true,
+    "target": "es2017",
+    "strictNullChecks": true
+  },
+  "compileOnSave": true,
+  "include": ["src"]
+}