Added firebase functions

firebase.json

@@ -12,5 +12,8 @@
         "destination": "/index.html"
       }
     ]
+  },
+  "functions": {
+    "predeploy": "npm --prefix \"$RESOURCE_DIR\" run build"
   }
 }

functions/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "functions",
+  "scripts": {
+    "build": "tsc",
+    "serve": "npm run build && firebase serve --only functions",
+    "shell": "npm run build && firebase functions:shell",
+    "start": "npm run shell",
+    "deploy": "firebase deploy --only functions",
+    "logs": "firebase functions:log"
+  },
+  "main": "lib/index.js",
+  "dependencies": {
+    "firebase-admin": "~5.12.1",
+    "firebase-functions": "^1.0.3"
+  },
+  "devDependencies": {
+    "typescript": "^2.5.3"
+  },
+  "private": true
+}

functions/src/index.ts

@@ -0,0 +1,5 @@
+import * as functions from 'firebase-functions';
+
+export const helloWorld = functions.https.onRequest((request, response) => {
+  response.send('Hello from Firebase!');
+});

functions/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "lib": ["es6"],
+    "module": "commonjs",
+    "noImplicitReturns": true,
+    "outDir": "lib",
+    "sourceMap": true,
+    "target": "es6"
+  },
+  "compileOnSave": true,
+  "include": [
+    "src"
+  ]
+}