generator-nest-js-boilerplate/generators/mailer/templates/mongodb/passportLocal/src/modules/app/app.module.ts

This generator will help you to build your own Nest.js Mongodb API using TypeScript 4

import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { MailerModule } from '@nestjs-modules/mailer';
import { HandlebarsAdapter } from '@nestjs-modules/mailer/dist/adapters/handlebars.adapter';

import V1Module from '@v1/v1.module';

import { MongooseModule } from '@nestjs/mongoose';
import AppController from './app.controller';
import AppService from './app.service';

@Module({
  imports: [
    ConfigModule.forRoot({
      isGlobal: true,
    }),
    MongooseModule.forRoot(process.env.MONGODB_URL as string, {
      // automatically try to reconnect when it loses connection
      autoReconnect: true,
      useCreateIndex: true,
      // reconnect every reconnectInterval milliseconds
      // for reconnectTries times
      reconnectTries: Number.MAX_VALUE,
      reconnectInterval: 1000,
      // flag to allow users to fall back to the old
      // parser if they find a bug in the new parse
      useNewUrlParser: true,
      useUnifiedTopology: true,
    }),
    MailerModule.forRootAsync({
      useFactory: (cfg: ConfigService) => ({
        transport: {
          host: cfg.get('MAILER_HOST'),
          port: Number(cfg.get('MAILER_PORT')),
          secure: false,
          auth: {
            user: cfg.get('MAILER_USERNAME'),
            pass: cfg.get('MAILER_PASSWORD'),
          },
        },
        defaults: {
          from: cfg.get('MAILER_FROM_EMAIL'),
        },
        template: {
          adapter: new HandlebarsAdapter(),
          options: {
            strict: true,
          },
        },
      }),
      inject: [ConfigService],
    }),
    V1Module,
  ],
  controllers: [AppController],
  providers: [AppService],
})
export default class AppModule {}