diff --git a/app/src/index.ts b/app/src/index.ts
index 345f083..67eca67 100644
--- a/app/src/index.ts
+++ b/app/src/index.ts
@@ -3,7 +3,7 @@ import * as Ads from './ads';
 import server from './server';
 dotenv.config();
 
-const PORT = process.env.PORT || 1228;
+const { PORT = 1228 } = process.env;
 
 Ads.startup();
 
diff --git a/app/src/server/index.ts b/app/src/server/index.ts
index e6b60e8..5d0bde0 100644
--- a/app/src/server/index.ts
+++ b/app/src/server/index.ts
@@ -5,13 +5,15 @@ import { Server } from 'socket.io';
 import { logger } from '../logger';
 import setRoutes from './routes';
 
+const { CORS = 'http://localhost:1227' } = process.env;
+
 const app = express();
 const http = createServer(app);
 export const io = new Server(http, {
-  cors: { origin: process.env.CORS || 'http://localhost:1227' }
+  cors: { origin: CORS }
 });
 
-app.use(cors({ origin: process.env.CORS || 'http://localhost:1227' }));
+app.use(cors({ origin: CORS }));
 
 setRoutes(app);
 
diff --git a/app/src/steam/currency.ts b/app/src/steam/currency.ts
index 5db91ba..4a507de 100644
--- a/app/src/steam/currency.ts
+++ b/app/src/steam/currency.ts
@@ -23,7 +23,7 @@ function replaceInvalid(str: string) {
 function currency(
   name: string,
   currencyId: number,
-  /* [index at pos 0, index at last pos] */ [a, b]: number[]
+  [a, b]: [number, number]
 ): ICurrency {
   return {
     name,
@@ -33,7 +33,7 @@ function currency(
 }
 
 export function getCurrency(id: number): ICurrency {
-  for (let obj of Object.keys(CURRENCIES)) {
+  for (let obj of Object.keys(CURRENCIES) as (keyof typeof CURRENCIES)[]) {
     const currency: ICurrency = CURRENCIES[obj];
     if (currency.currencyId === id) {
       return currency;