for Elm

main.js

try {
  main()
} catch (e) {
  document.body.textContent = ""
  create(document.body, "h1", "m-3").textContent = "😔"
  create(document.body, "pre", "m-3").textContent = e
  throw e
}

function main() {
  const node = create(document.body, "div")
  const app = Elm.Main.init({ node: node, flags: {} })
}

function create(parent, type, className) {
  const el = document.createElement(type)
  if (parent) parent.appendChild(el)
  if (className) el.className = className
  return el
}