index.js

import path from "node:path"
import { fileURLToPath } from "node:url"

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

const templateList = [
  {
    templateId: "example",
    templateSubject: "example",
  },
]

templateList.reduce((acc, templateInfo) => {
  const { templateId } = templateInfo
  if (acc[templateId] === 1) {
    throw new Error(
      `Error: Duplicate SES template id "${templateId}", they should be unique`,
    )
  }
  acc[templateId] = 1
  return acc
}, {})

/**
 * @param {Object} serverless - Serverless instance
 * @param {Object} _options - runtime options
 * @returns {Promise<{name: string, subject: string, html: string, text: string}[]>}
 */
const templateConfiguration = async (serverless, _options) => {
  // You can load template configuration from filesystem using serverless object + runtime options
  // or from any other source like database or API

  const sesEmailTemplates = templateList.map((templateInfo) => {
    const { templateId, templateSubject } = templateInfo
    const templatePathHtml = path.join(
      __dirname,
      `templates/${templateId}.html`,
    )
    const templatePathTxt = path.join(__dirname, `templates/${templateId}.txt`)

    return {
      name: templateId,
      subject: templateSubject,
      html: serverless.utils.readFileSync(templatePathHtml),
      text: serverless.utils.readFileSync(templatePathTxt),
    }
  })
  return sesEmailTemplates
}

export default templateConfiguration