Fetch-based email sending using SES - perfect for Cloudflare and other non-Node.js runtimes

makeEmailSender.ts

import { AwsClient } from "aws4fetch";

const sesEndpoint = "email.us-east-1.amazonaws.com";

export function makeEmailSender({
  accessKeyId,
  secretAccessKey,
  defaultFromAddress,
}: {
  accessKeyId: string;
  secretAccessKey: string;
  defaultFromAddress: string;
}) {
  const awsClient =
    accessKeyId && secretAccessKey
      ? new AwsClient({
          accessKeyId,
          secretAccessKey,
        })
      : null;
  return async function sendEmail({
    to,
    subject,
    html,
    text,
    from,
  }: {
    to: string | string[];
    subject: string;
    html?: string;
    text: string;
    from?: string;
  }) {
    if (!awsClient) {
      console.log({ to, subject, text, html, from });
      return;
    }
    await awsClient.fetch(`https://${sesEndpoint}/v2/email/outbound-emails`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        Content: {
          Simple: {
            Subject: { Data: subject },
            Body: {
              ...(html
                ? {
                    Html: {
                      Data: html,
                    },
                  }
                : null),
              Text: {
                Data: text,
              },
            },
          },
        },
        Destination: {
          ToAddresses: Array.isArray(to) ? to : [to],
        },
        FromEmailAddress: from || defaultFromAddress,
      }),
    });
  };
}