diff --git a/.eslintrc.js b/.eslintrc.js
index eaa1a24..640023c 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -7,6 +7,12 @@ module.exports = {
   },
   'extends': 'eslint:recommended',
   'overrides': [
+    {
+      files: ['**/*.ts','**/*.js'],
+      parser: '@typescript-eslint/parser',
+      plugins: ['@typescript-eslint'],
+      extends: ['plugin:@typescript-eslint/eslint-recommended', 'plugin:@typescript-eslint/recommended']
+  }
   ],
   'parserOptions': {
     'ecmaVersion': 'latest'
diff --git a/src/utils/auth.utils.js b/src/utils/auth.utils.ts
similarity index 91%
rename from src/utils/auth.utils.js
rename to src/utils/auth.utils.ts
index c32c417..72fdd2b 100644
--- a/src/utils/auth.utils.js
+++ b/src/utils/auth.utils.ts
@@ -5,7 +5,7 @@ const fs     = require('fs/promises');
 const minify = require('../utils/minify.utils');
 
 // Checks users registration key against issued keys
-async function isAuthed(uuid) {  // Needs testing
+async function isAuthed(uuid: string) {  // Needs testing
   const q = {uuid: uuid};
   const res = await db.query('users', q);
   log.out('authUtils.checkUser: DB Query answer: ' + 
@@ -16,7 +16,7 @@ async function isAuthed(uuid) {  // Needs testing
 }
 
 // Checks whether a registration request key is valid
-async function checkRequest(key) {
+async function checkRequest(key: string) {
   const collection = 'registrations';
   const query = {uuid: key};
   const res = await db.query(collection, query);
@@ -33,7 +33,7 @@ async function generateKey() {  // Needs testing & moving to 'register.utils'
   return crypto.randomUUID();
 }
 
-async function generateConfirmationEmail(eml, uuid) {
+async function generateConfirmationEmail(eml: string, uuid: string) {
   try {
     const htmlTpl = await fs.readFile('mail-templates/register.html', 'utf-8');
     const htmlStr = htmlTpl.replace(/>>ACCESSCODE<</g, uuid);
diff --git a/tsconfig.json b/tsconfig.json
index 82caffb..17ed355 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -105,5 +105,11 @@
     /* Completeness */
     // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
     "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
-  }
+  },
+  "include": [
+    "./src",
+    "./test",
+    "./*",
+    "./config" 
+  ]
 }