transform.core.ts

import { INestApplication, ValidationPipe, BadRequestException } from '@nestjs/common';

export function setupTransform(app: INestApplication) {
  app.useGlobalPipes(
    new ValidationPipe({
      transform: true,
      transformOptions: {
        enableImplicitConversion: true,
      },
      whitelist: true,
      forbidNonWhitelisted: true,
      exceptionFactory: (errors) => {
        const messages = errors.flatMap((error) => {
          if (error.constraints) {
            return Object.values(error.constraints);
          }
          return [];
        });
        return new BadRequestException(messages);
      },
    }),
  );
}