use configuration package as middleware

src/config/carpool.config.ts

@@ -1,5 +1,13 @@
 import { registerAs } from '@nestjs/config';
 
+export interface CarpoolConfig {
+  departureTimeMargin: number;
+  role: string;
+  seatsProposed: number;
+  seatsRequested: number;
+  strictFrequency: boolean;
+}
+
 export default registerAs('carpool', () => ({
   departureTimeMargin: process.env.DEPARTURE_TIME_MARGIN
     ? parseInt(process.env.DEPARTURE_TIME_MARGIN, 10)

src/config/pagination.config.ts

@@ -1,5 +1,9 @@
 import { registerAs } from '@nestjs/config';
 
+export interface PaginationConfig {
+  perPage: number;
+}
+
 export default registerAs('pagination', () => ({
   perPage: process.env.PER_PAGE ? parseInt(process.env.PER_PAGE, 10) : 10,
 }));