Features

• Provide a way to send emails
• Provide easy to use options by default

Installation

$ npm i --save nest-mailer

Example Usage with sendgrid

Create mailer module in you application:

import { Global, Module } from '@nestjs/common';
import { MailerModule, SendgridMailer } from 'nest-mailer-module';
import { MailerEventEmitter } from './mailer.emitter';

@Global()
@Module({
  imports: [MailerModule.forRoot({ mailer: new SendgridMailer(/* sendgrid api key*/) })],
  providers: [MailerEventEmitter],
  exports: [MailerEventEmitter],
})
export class AppMailerModule {}

Then create our MailerEventEmitter

import { Injectable } from '@nestjs/common';
import { EventEmitter2 } from '@nestjs/event-emitter';
import { SendEmailEvent, SEND_EMAIL_EVENT } from 'nest-mailer-module';

@Injectable()
export class MailerEventEmitter {
  constructor(private eventEmitter: EventEmitter2) {}

  emit(event: SendEmailEvent) {
    this.eventEmitter.emit(SEND_EMAIL_EVENT, new SendEmailEvent({
      from: 'from@mydomain.com',
      ...event.message,
    }));
  }
}

After that we should import our newly created module in app.module and we can inject it in any service since it was configured as global module with private mailerEventEmitter: MailerEventEmitter.

Now we can send plain emails with:

this.mailerEventEmitter.emit({
  subject: 'Reset Password',
  to: [{ email: 'someone@example.com', type: 'to' }],
  text: `Reset password`,
});

Adding own mailer client

We can write our custom mailer by implementing interface Mailer and using it in mailer.module as mailer property for configuration. Here we have an example of mandrill client:

import { Logger } from '@nestjs/common';
import { Mandrill } from 'mandrill-api';

import { Mailer, Message } from 'nest-mailer-module';

export class MandrillMailer implements Mailer {
  private logger = new Logger(MandrillMailer.name);
  mandrillClient: any;

  constructor(mandrillApiKey: string) {
    this.mandrillClient = new Mandrill(mandrillApiKey);
    this.mandrillClient.users.ping(
      {},
      result => this.logger.log('ping "mandrill" success'),
      e => this.logger.error('ping "mandrill" failed'),
    );
  }

  send(message: Message) {
    const loggerContext = { subject: message.subject, to: message.to };
    this.logger.log(loggerContext, 'Sending email');
    return this.mandrillClient.messages.send(
      {
        message: {
          auto_text: true,
          from_email: message.from?.email,
          from_name: message.from?.name,
          html: message.html,
          important: true,
          subject: message.subject,
          to: message.to,
          text: message.text,
        },
        async: true,
      },
      () => {
        this.logger.log(loggerContext, `Mail sent`);
      },
      error => {
        this.logger.error(error, error.message);
      },
    );
  }
}

Example usage with react templated emails

Let's start with creating mailer module in you application like in first example

Now we can create ReactMailerEventEmitter

import { Injectable } from '@nestjs/common';
import { EventEmitter2 } from '@nestjs/event-emitter';
import { SendTemplatedEmailEvent, SEND_TEMPLATED_EMAIL_EVENT } from 'nest-mailer-module';

@Injectable()
export class ReactMailerEventEmitter {
  constructor(private eventEmitter: EventEmitter2) {}

  emit(event: SendTemplatedEmailEvent) {
    this.eventEmitter.emit(SEND_TEMPLATED_EMAIL_EVENT,
      new SendTemplatedEmailEvent(event.template, {
        from: 'from@mydomain.com',
        ...event.message,
      }, event.mergeVars),
    );
  }
}