.babelrc

{
  "presets": [
    ["@babel/preset-env", { "modules": false }],
    "@babel/preset-react"
  ],
  "plugins": [
    ["@babel/plugin-proposal-decorators", { "legacy": true }],
    ["@babel/plugin-proposal-class-properties", { "loose": true }],
    ["react-hot-loader/babel"],
    [
      "styled-components",
      {
        "ssr": false,
        "displayName": true,
        "preprocess": false
      }
    ]
  ],
  "env": {
    "test": {
      "presets": [
        ["@babel/preset-env", {
          "modules": "commonjs",
          "targets": {
            "browsers": ["last 2 Chrome versions"]
          }
        }],
        "@babel/preset-react"
      ],
      "plugins": [
        ["@babel/plugin-proposal-decorators", { "legacy": true }],
        ["@babel/plugin-proposal-class-properties", { "loose": true }],
        [
          "styled-components",
          {
            "ssr": false,
            "displayName": true,
            "preprocess": false
          }
        ]
      ]
    }
  }
}