file nestjs openapi yaml
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);
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