"typescript": "~2.4.0",
"ts-loader": "^2.2.1",

// webpack.config.js
// path: module.rules

      {
        test: /\.(ts|tsx)$/,
        include: paths.appSrc,
        loader: require.resolve('ts-loader'),
        options: {
          transpileOnly: true,
          getCustomTransformers: () => ({
            before: [ content => node => node ] // Issue caused by here!!!!!!!!!!
          }),
        },
      }

error TS6059: File 'index.tsx' is not under 'rootDir' '/Users/Zheeeng/Workspace/project/src'. 'rootDir' is expected to contain all source files.

"compilerOptions": {
    "rootDir": "src"
}