const app = await NestFactory.create(ApplicationModule);
const options = new DocumentBuilder()
    .setTitle("Title")
    .setDescription("description")
    .setVersion("1.0")
    .build();
const document = SwaggerModule.createDocument(app, options);

fs.writeFileSync("./swagger-spec.json", JSON.stringify(document));
SwaggerModule.setup("/api", app, document);

await app.listen(80);