Export AWS Route53 domain records to Cloudflare as a terraform module

aws-to-cloudflare-records.mjs

#!/usr/bin/env zx

# npm install -g zx
# ./aws-to-cloudflare-records.mjs my-amazing-zone.com

const domain = process.argv[3]
const recordName = (n) => n.replace("\\052","*").replace(`.${process.argv[3]}.`, "")
const resourceName = (n) => recordName(n).replace(/-/g,"_")

const toString = ({name, type, ttl, value}) => `resource "cloudflare_record" ${JSON.stringify(resourceName(name))} {
  name    = ${JSON.stringify(recordName(name))}
  type    = ${JSON.stringify(type)}
  ttl     = ${JSON.stringify(ttl)}
  value   = ${JSON.stringify(value)}
  zone_id = cloudflare_zone.this.id
}`

const convertAliasTarget = (r) => toString({
  name: r.Name,
  type: "CNAME",
  ttl: 60,
  value: r.AliasTarget.DNSName,
})

const convertResourceRecords = (r) => (v) => toString({
  name: r.Name,
  type: r.Type,
  ttl: r.TTL,
  value: v.Value
})

const convertRecordSet = (r) => r.AliasTarget
  ? convertAliasTarget(r)
  : r.ResourceRecords.map(convertResourceRecords(r))

const newLine = "\n\n"
const isNotExcluded = (r) => !["NS", "SOA"].includes(r.Type)

const result = (r) => JSON.parse(r.stdout)
  .filter(isNotExcluded)
  .flatMap(convertRecordSet)
  .join(newLine)

const zone = await $`aws route53 list-hosted-zones-by-name --dns-name ${domain} | jq -r '.HostedZones[0] | .Id | sub("/hostedzone/"; "")'`
const recordSets = await $`aws route53 list-resource-record-sets --hosted-zone-id ${zone} --output json | jq '.ResourceRecordSets'`
await fs.outputFile("main.tf", result(recordSets))