third_party/devtools/scripts/migration/package.json

{
  "devDependencies": {
    "@types/node": "^12.7.1",
    "recast": "^0.18.2",
    "typescript": "^3.6.3"
  },
  "scripts": {
    "build": "tsc",
    "migrate": "node refactor-to-es-module.js",
    "remove-unused": "npm run build && node remove-unused-global-exports.js"
  }
}