Update Firebase functions to gen2

firebase.json

@@ -31,13 +31,23 @@
       }
     ]
   },
-  "functions": {
-    "predeploy": [
-      "npm --prefix \"$RESOURCE_DIR\" install",
-      "npm --prefix \"$RESOURCE_DIR\" run build"
-    ],
-    "source": "functions"
-  },
+  "functions": [
+    {
+      "predeploy": [
+        "npm --prefix \"$RESOURCE_DIR\" run lint",
+        "npm --prefix \"$RESOURCE_DIR\" run build"
+      ],
+      "source": "functions",
+      "codebase": "default",
+      "ignore": [
+        "node_modules",
+        ".git",
+        "firebase-debug.log",
+        "firebase-debug.*.log",
+        "*.local"
+      ]
+    }
+  ],
   "storage": {
     "rules": "firebase/storage.rules"
   }

functions/.eslintrc.js

@@ -0,0 +1,34 @@
+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",
+    ],
+    parser: "@typescript-eslint/parser",
+    parserOptions: {
+        project: ["tsconfig.json", "tsconfig.dev.json"],
+        sourceType: "module",
+    },
+    ignorePatterns: [
+        "/lib/**/*", // Ignore built files.
+        "/generated/**/*", // Ignore generated files.
+    ],
+    plugins: [
+        "@typescript-eslint",
+        "import",
+    ],
+    rules: {
+        "quotes": ["error", "double"],
+        "import/no-unresolved": 0,
+        "indent": ["error", 4],
+        "max-len": ["error", {"code": 100}],
+    },
+};

functions/.gitignore

@@ -1,8 +1,10 @@
-## Compiled JavaScript files
-**/*.js
-**/*.js.map
+# Compiled JavaScript files
+lib/**/*.js
+lib/**/*.js.map
 
-# Typescript v1 declaration files
+# TypeScript v1 declaration files
 typings/
 
-node_modules/
+# Node.js dependency directory
+node_modules/
+*.local