.babelrc

{
    "presets": [
        ["env",{ "modules": false }], "react"
    ],
   
    "plugins": [
        [  "transform-class-properties",
            "transform-es2015-classes", {
                "loose": true
            }
        ],
        ["transform-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/ReactDOMServer",
             "react-noop-renderer": "./dist/ReactNoop",
             "react": "./dist/React",
             "lib": "./lib",
             "react-dom": "./dist/React",
             "test-utils": "./lib/ReactTestUtils"
           }
         }]
    ]
}