.babelrc

{
  "env": {
    "test": {
      "presets": [
        ["@babel/env", {
          "targets": {
            "node": "current"
          }
        }], "@babel/preset-typescript"
      ],
      "plugins": [
        ["@babel/plugin-proposal-decorators", {
          "legacy": true
        }]
      ]
    }
  }
}