.babelrc

{
  "presets": ["@babel/preset-env", "@babel/preset-react"],
  "plugins": [
    [
      "@babel/plugin-transform-runtime",
      {
        "helpers": false
      }
    ],
    [
      "transform-class-properties",
      {
        "loose": true
      }
    ],
    "@babel/plugin-transform-classes",
    [
      "transform-es2015-classes",
      {
        "loose": true
      }
    ],
    [
      "@babel/plugin-proposal-object-rest-spread",
      {
        "useBuiltIns": true
      }
    ],
    [
      "module-resolver",
      {
        "root": [
          "."
        ],
        "alias": {
          "react-core": "./packages/core",
          "react-fiber": "./packages/fiber",
          "prop-types": "./lib/ReactPropTypes",
          "create-react-class": "./lib/createClass",
          "react-server-renderer": "./dist/React/server",
          "react-noop-renderer": "./dist/ReactNoop",
          "react": "./dist/React",
          "lib": "./lib",
          "react-dom": "./dist/React",
          "test-utils": "./lib/ReactTestUtils"
        }
      }
    ]
  ]
}