Compass/backend/email/emails/functions/send-email.ts

import {IS_LOCAL} from 'common/hosting/constants'
import {debug} from 'common/logger'
import {sleep} from 'common/util/time'
import {type CreateEmailOptions, CreateEmailRequestOptions, Resend} from 'resend'
import {log} from 'shared/utils'

/*
 * typically: { subject: string, to: string | string[] } & ({ text: string } | { react: ReactNode })
 */
export const sendEmail = async (
  payload: CreateEmailOptions,
  options?: CreateEmailRequestOptions,
) => {
  const resend = getResend()
  debug(resend, payload, options)

  const skip = IS_LOCAL && process.env.SEND_EMAIL_LOCALLY !== 'true'
  if (skip) {
    console.warn('Skipping email send')
    return null
  }

  if (!resend) return null

  const {data, error} = await resend.emails.send(
    {
      replyTo: 'Compass <hello@compassmeet.com>',
      ...payload,
    },
    options,
  )
  debug('resend.emails.send', data, error)

  if (error) {
    log.error(`Failed to send email to ${payload.to} with subject ${payload.subject}`)
    log.error(error)
    return null
  }

  log(`Sent email to ${payload.to} with subject ${payload.subject}`)

  await sleep(1000) // to avoid rate limits (2 / second in resend free plan)

  return data
}

let resend: Resend | null = null
const getResend = () => {
  if (resend) return resend

  if (!process.env.RESEND_KEY) {
    debug('No RESEND_KEY, skipping email send')
    return
  }

  const apiKey = process.env.RESEND_KEY as string
  // console.debug(`RESEND_KEY: ${apiKey}`)
  resend = new Resend(apiKey)
  return resend
}