composa/examples/advanced/04_retry_logic.js

Compose beautiful multilingual emails with XHTML templates and Nodemailer

import { EmailClient, defaultSubjects } from "composa";

const mockMailer = new EmailClient({
	defaultLang: "en",
	subjects: defaultSubjects,
	defaults: { APP_NAME: "TestApp", APP_URL: "https://test.com" },
	transporter: {
		sendMail: async (mailOptions) => {
			if (Math.random() < 0.3) throw new Error("Mock failure");
			return { messageId: `mock-${Date.now()}`, response: "Mock OK" };
		},
		verify: async () => true,
	},
});

async function run() {
	const { html, subject } = mockMailer.compileMail("suspicious-login", {
		lang: "en",
		variables: {
			USER_NAME: "Tester",
			LOGIN_TIME: new Date().toISOString(),
		},
	});
	const result = await mockMailer.sendWithRetry(
		{ to: "retry-test@example.com", html, subject },
		3,
	);
	console.log("Retry result:", result);
}

run();