How to Send Email with Vercel

import { AhaSendClient, isAhaSendError } from "@ahasend/sdk";

const ahasend = AhaSendClient.fromEnv();

export type WelcomeInput = {
  signupId: string;
  email: string;
  name?: string;
};

async function welcomeKey(signupId: string, sandbox: boolean): Promise<string> {
  const digest = await crypto.subtle.digest(
    "SHA-256",
    new TextEncoder().encode(signupId),
  );
  const hex = Array.from(new Uint8Array(digest), (byte) =>
    byte.toString(16).padStart(2, "0"),
  ).join("");
  return `welcome-${sandbox ? "sandbox" : "live"}-${hex}`;
}

export async function sendWelcomeEmail(input: WelcomeInput) {
  const sandbox = process.env.AHASEND_SANDBOX === "true";

  try {
    const result = await ahasend.messages.send(
      {
        from: { email: "hello@yourdomain.com", name: "Your App" },
        recipients: [{ email: input.email, name: input.name }],
        subject: "Welcome to Your App!",
        html_content: "<h1>Welcome aboard</h1>",
        text_content: "Welcome aboard",
        sandbox,
      },
      { idempotencyKey: await welcomeKey(input.signupId, sandbox) },
    );

    const rejectedCount = result.data.filter(
      (entry) => entry.status === "error",
    ).length;
    if (rejectedCount > 0) {
      console.error("AhaSend rejected recipients", { rejectedCount });
      throw new Error("Email could not be queued");
    }

    return { queued: result.data.length };
  } catch (error) {
    if (isAhaSendError(error)) {
      const { code, status, requestId } = error.toJSON();
      console.error("AhaSend request failed", { code, status, requestId });
    }
    throw new Error("Email could not be queued");
  }
}