zulip/.babelrc

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "corejs": 3,
        "useBuiltIns": "usage"
      }
    ],
    "@babel/typescript"
  ],
  "plugins": [
    "@babel/proposal-class-properties"
  ],
  "sourceType": "unambiguous"
}