@haatlabs-core/mailer

Sends the apps' email (sign-in codes). The apps call a Mailer; how mail leaves is an adapter, a MailTransport, one per provider.

const mailer = mailerFromConfig(config.mail);   // SMTP from config-core's MailConfig, or not configured
if (mailer.configured) await mailer.send({ to, subject, text });

createMailer({ from, transport: smtpTransport({ host, port, secure, user, password }) });
createMailer({ from, transport: memoryTransport() });   // tests: keeps what it is sent

Adding a provider (an email API with a key): write an adapter, and choose it in mailerFromConfig from the configuration. Nothing in the apps changes.

export function exampleApiTransport(options: { apiKey: string }): MailTransport {
  return {
    name: 'example-api',
    send: async ({ from, to, subject, text }) => {
      const response = await fetch('https://api.example.com/send', {
        method: 'POST',
        headers: { authorization: `Bearer ${options.apiKey}`, 'content-type': 'application/json' },
        body: JSON.stringify({ from, to, subject, text }),
      });
      if (!response.ok) throw new Error(`example-api refused the email (HTTP ${response.status})`);
    },
  };
}

An adapter throws when the provider refuses or cannot be reached, and never logs what it sends: a sign-in code is as good as a password. Without a provider, configured is false and send refuses with EMAIL_ERROR.

Install

pnpm add @haatlabs-core/mailer