maestro/src/main.ts

import { NestFactory } from '@nestjs/core';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
import { writeFileSync } from 'fs';
import helmet from 'helmet';

import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule, {
    cors: {
      origin: '*',
      methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
      preflightContinue: false,
      optionsSuccessStatus: 204,
    },
  });

  app.use(helmet());

  const config = new DocumentBuilder()
    .setTitle('Maestro Grpc Documentation')
    .setDescription('Documentation for Maestro gateway')
    .setVersion('1.0')
    .addBearerAuth()
    .build();

  const document = SwaggerModule.createDocument(app, config);
  writeFileSync('./swagger.json', JSON.stringify(document));
  SwaggerModule.setup('api', app, document);

  await app.listen(3333);
}
bootstrap();