md с api, подправил запросы

front/src/features/catalog/categoriesSlice.ts

@@ -5,7 +5,7 @@ import axios from "axios";
 export const fetchCategories = createAsyncThunk<Category[]>(
   "categories/fetchCategories",
   async () => {
-    const res = await axios.get("/api/categories");
+    const res = await axios.get<Category[]>("/api/categories");
     return res.data;
   }
 );

front/src/features/catalog/productsSlice.ts

@@ -11,6 +11,13 @@ interface FetchParams {
   filters?: Record<string, string | number | (string | number)[]>;
 }
 
+interface FetchResponce{
+  items: Product[],
+  total: number,
+  page: number,
+  limit: number,
+}
+
 export const fetchProductsByCategory = createAsyncThunk(
   "products/fetchByCategory",
   async (params: FetchParams) => {
@@ -26,7 +33,7 @@ export const fetchProductsByCategory = createAsyncThunk(
         else qp.append(k, String(v));
       });
     }
-    const res = await client.get(`/products?${qp.toString()}`);
+    const res = await client.get<FetchResponce>(`/products?${qp.toString()}`);
     // ожидаем { items: Product[], total: number, page: number, limit: number }
     return res.data;
   }