TypeScript with APIs

APIs return data. Type it to avoid bugs.

      ## Define response type
      ```ts
      type User = {
        id: number;
        name: string;
      };
      
      type ApiResponse<T> = {
        data: T;
        status: number;
      };
      ```
      
      ## Fetch example
      ```ts
      async function fetchUser(): Promise<ApiResponse<User>> {
        return {
          data: { id: 1, name: "Tom" },
          status: 200
        };
      }
      ```
      
      ## Use it
      ```ts
      async function main() {
        const res = await fetchUser();
        console.log(res.data.name);
      }
      ```
      
      ## Graph
      ```mermaid
      flowchart LR
        A[API] --> B[Response JSON]
        B --> C[Typed Object]
      ```
      
      ## Remember
      - Always type API contracts
      - Generics help reuse responses