Add missing scripts & update linter for TS sample

Author: inlined

typescript-getting-started/functions/package.json

@@ -11,7 +11,8 @@
     "typescript": "^2.6.1"
   },
   "scripts": {
-    "build": "./node_modules/.bin/tslint --project tsconfig.json && ./node_modules/.bin/tsc",
+    "lint": "./node_modules/.bin/tslint -p tsconfig.json",
+    "build": "./node_modules/.bin/tsc",
     "serve": "npm run build && firebase serve --only functions",
     "shell": "npm run build && firebase experimental:functions:shell",
     "start": "npm run shell",

typescript-getting-started/functions/tslint.json

@@ -71,9 +71,6 @@
     // Expressions must always return a value. Avoids common errors like const myValue = functionReturningVoid();
     "no-void-expression": [true, "ignore-arrow-function-shorthand"],
 
-    // Makes sure result of typeof is compared to correct string values.
-    "typeof-compare": true,
-
     // Disallow duplicate imports in the same file.
     "no-duplicate-imports": true,