.babelrc

{
  "plugins": [
    "@babel/plugin-transform-runtime",
    ["@babel/plugin-proposal-class-properties", { "loose": true }],
    ["@babel/plugin-proposal-private-property-in-object", { "loose": true }],
    ["@babel/plugin-proposal-private-methods", { "loose": true }]
  ],
  "presets": ["@babel/preset-env", "@babel/preset-react"],
  "env": {
    "lib": {
      "plugins": [
        "@babel/plugin-transform-runtime",
        ["@babel/plugin-proposal-class-properties", { "loose": true }],
        [
          "@babel/plugin-proposal-private-property-in-object",
          { "loose": true }
        ],
        ["@babel/plugin-proposal-private-methods", { "loose": true }],
        ["babel-plugin-transform-remove-imports", { "test": "\\.(scss)$" }]
      ],
      "presets": ["@babel/preset-env", "@babel/preset-react"]
    }
  }
}