Since some applications will apparently need to support IE until the end of time, here's an easy way to do so while continuing to write modern Javascript.

Babel 7.8.0 easy setup

{
  "scripts": {
    "transpile": "./node_modules/.bin/babel src/ --out-dir public/"
  },
  "babel": {
    "presets": [
      "@babel/preset-env"
    ]
  },
  "devDependencies": {
    "@babel/cli": "^7.22.15",
    "@babel/core": "^7.22.20",
    "@babel/preset-env": "^7.22.20"
  }
}