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Chapter 21/Beginning of Chapter/sportsstore/src/data/index.ts

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+import { CatalogRepository } from "./catalog_repository";
+import { CatalogRepoImpl} from "./orm";
+import { OrderRepository } from "./order_repository";
+import { CustomerRepository } from "./customer_repository";
+
+const repo = new CatalogRepoImpl();
+
+export const catalog_repository: CatalogRepository = repo;
+export const order_repository: OrderRepository = repo;
+export const customer_repository: CustomerRepository = repo;