.babelrc

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "modules": false
      }
    ],
    "@babel/preset-react"
  ],
  "env": {
    "production": {
      "only": ["app"],
      "plugins": [
        ["emotion", { "hoist": true }],
        "transform-react-remove-prop-types",
        "@babel/plugin-transform-react-constant-elements",
        "@babel/plugin-transform-react-inline-elements"
      ]
    },
    "development": {
      "plugins": [
        ["emotion", { "sourceMap": true, "autoLabel": true }]
      ]
    },
    "test": {
      "plugins": [
        "emotion",
        "@babel/plugin-transform-modules-commonjs",
        "dynamic-import-node"
      ]
    }
  },
  "plugins": [
    "react-hot-loader/babel",
    "emotion",
    ["@babel/plugin-proposal-decorators", { "legacy": true}],
    ["@babel/plugin-proposal-class-properties", { "loose": true }],
    ["@babel/plugin-proposal-private-methods", { "loose": true }],
    ["@babel/plugin-proposal-private-property-in-object", { "loose": true }],
    "@babel/plugin-syntax-dynamic-import",
    ["@babel/plugin-proposal-optional-chaining", { "loose": false }]
  ]
}