nestjs-serverless-swagger

gistfile1.txt

import 'reflect-metadata';
import { Handler, Context } from 'aws-lambda';
import { createServer, proxy } from 'aws-serverless-express';
import { eventContext } from 'aws-serverless-express/middleware';
import * as express from 'express';
import { Server } from 'http';
import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
import { INestApplication, INestExpressApplication } from '@nestjs/common';

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

// NOTE: If you get ERR_CONTENT_DECODING_FAILED in your browser, this is likely
// due to a compressed response (e.g. gzip) which has not been handled correctly
// by aws-serverless-express and/or API Gateway. Add the necessary MIME types to
// binaryMimeTypes below
const binaryMimeTypes: string[] = [];

let cachedServer: Server;

process.on('unhandledRejection', console.error);

process.on('uncaughtException', console.error);

async function setupSwagger(app: INestApplication & INestExpressApplication) {
  const options = new DocumentBuilder()
    .setTitle('Cats example')
    .setDescription('The cats API description')
    .setVersion('1.0')
    .addTag('cats')
    .build();
  const document = SwaggerModule.createDocument(app, options);
  SwaggerModule.setup('swagger', app, document);
}

async function bootstrap(): Promise<Server> {
  if (!cachedServer) {
    try {
      const expressApp = express();
      const nestApp = await NestFactory.create(AppModule, expressApp);
      nestApp.use(eventContext());
      nestApp.enableCors();
      await nestApp.init();
      setupSwagger(nestApp);
      cachedServer = createServer(expressApp, undefined, binaryMimeTypes);
    } catch (error) {
      return Promise.reject(error);
    }
  }
  return Promise.resolve(cachedServer);
}

export const handler: Handler = async (event: any, context: Context) =>
  proxy(await bootstrap(), event, context, 'PROMISE').promise;