refactor: migrate /auth endpoint handling to Typescript, Domain Drive…

…n Design (#215)

* refactor: introduces nested routing in TS
* doc: add better documentation for functions
* chore: add eslint for all "*.spec.ts" files
* test(jestExpress): enhance mockResponse creation - mockResponse now allows injection of other response-related keys used to setup all the middlewares that helps in testing
* test(AuthRoutes): add /checkuser integration tests
* fix: update tsconfig.build.json to exclude spec files and public
* test: add CookieStore helper class to store cookies for auth'd routes
* Introduces ApplicationError as an abstract class for extension - this prevents developers from using ApplicationError directly and are forced to extend from the class (in Typescript).

.eslintrc

@@ -52,7 +52,8 @@
         "import/newline-after-import": "error",
         "import/no-duplicates": "error"
       }
-    }
+    },
+    { "files": ["*.spec.ts"], "extends": ["plugin:jest/recommended"] }
   ],
   "rules": {
     "no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],

package.json

@@ -186,6 +186,7 @@
     "@types/nodemailer-direct-transport": "^1.0.31",
     "@types/promise-retry": "^1.1.3",
     "@types/puppeteer-core": "^2.0.0",
+    "@types/supertest": "^2.0.10",
     "@types/triple-beam": "^1.3.2",
     "@types/uid-generator": "^2.0.2",
     "@types/uuid": "^8.0.0",