.babelrc

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": [
          "last 2 versions",
          "not dead",
          "not < 2%",
          "not ie 11"
        ],
        "useBuiltIns": "entry"
      }
    ],
    "@babel/preset-react"
  ],
  "plugins": [
    "react-hot-loader/babel",
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-syntax-dynamic-import"
  ],
  "env": {
    "test": { "plugins": ["babel-plugin-dynamic-import-node"] }
  }
}