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apps/api/src/common/interceptors/response.interceptor.ts

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+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+export interface ResponseFormat<T> {
+  success: boolean;
+  data: T;
+  meta?: any;
+}
+
+@Injectable()
+export class ResponseInterceptor<T> implements NestInterceptor<T, any> {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    return next.handle().pipe(
+      map((data) => {
+        // If data is already formatted or is a file buffer/stream, pass through
+        if (data && typeof data === 'object' && ('success' in data || 'data' in data)) {
+          return data;
+        }
+        return {
+          success: true,
+          data,
+        };
+      }),
+    );
+  }
+}