.babelrc

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