diff --git a/src/repositories/ApiBasedRepository.ts b/src/repositories/ApiBasedRepository.ts
index 00b1353..4c9a1c0 100644
--- a/src/repositories/ApiBasedRepository.ts
+++ b/src/repositories/ApiBasedRepository.ts
@@ -1,8 +1,18 @@
 import { GetterRepository } from "./GetterRepository";
-import { IEta } from "../entities/entities";
+import { IEta, IOrderedStop, IRoute } from "../entities/entities";
 
 // TODO: implement
 
+interface ApiBasedRepositoryCache {
+  etasForShuttleId: {
+    [shuttleId: string]: IEta[],
+  },
+  etasForStopId: {
+    [stopId: string]: IEta[],
+  },
+  // To speed things up, implement caches for other data later
+}
+
 export class ApiBasedRepository implements GetterRepository {
   public async getEtaForShuttleAndStopId(shuttleId: string, stopId: string): Promise<IEta | null> {
     return null;