Simple example of a JavaScript based Terraform pre-processor using tagged template literal

jtf.js

function resource (literals, func) {
    console.log(`resource ${literals[0]} ${func()} ${literals[1]}`);
}

function ip_set_descriptors (literals, func) {
    return `ip_set_descriptors ${literals[0]} ${func()} ${literals[1]}`;
}

const ips = ['209.171.43.251', '54.55.73.82'];

resource `"aws_waf_ipset" "crc_office" {
  name = "dev-crc-office-waf-ipset"

 ${() => ips.map(ip => (
  ip_set_descriptors `{
     type  = "IPV4"
     value = ${() => ip}/32
  }`
 ))}
}`