How to use the react-scripts/config/paths.appPackageJson function in react-scripts

// and thus babel-runtime might not be resolvable from the source.
      'babel-runtime': path.dirname(
        require.resolve('babel-runtime/package.json')
      ),
      // @remove-on-eject-end
      // Support React Native Web
      // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
      'react-native': 'react-native-web',
    },
    plugins: [
      // Prevents users from importing files from outside of src/ (or node_modules/).
      // This often causes confusion because we only process files within src/ with babel.
      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
      // please link the files into your node_modules/ and let module-resolution kick in.
      // Make sure your source files are compiled, as they will not be processed in any way.
      new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
    ],
  },
  module: {
    strictExportPresence: true,
    rules: [
      // TODO: Disable require.ensure as it's not a standard language feature.
      // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
      // { parser: { requireEnsure: false } },

      {
        // "oneOf" will traverse all following loaders until one will
        // match the requirements. When no loader matches it will fall
        // back to the "file" loader at the end of the loader list.
        oneOf: [
          // "url" loader works just like "file" loader but it also embeds
          // assets smaller than specified size as data URLs to avoid requests.

else if(!hasSlash && needsSlash) return `${inputPath}/`
  else return inputPath
}

function getServedPath(publicUrl) {
  const servedUrl = publicUrl ? url.parse(publicUrl).pathname : '/'

  return ensureSlash(servedUrl, true)
}

paths.dotenv = existsSync(appDotEnv) ? appDotEnv : paths.dotenv
paths.appPath = appRootPath + '/'
paths.appPublic = appPublic
paths.appHtml = appPublic + '/index.html'
paths.appBuild = appBuild
paths.appPackageJson = appPackage
paths.yarnLockFile = appRootPath + '/yarn.lock'
paths.appSrc = appSrc
paths.appIndexJs = appSrc + '/index.js'
paths.proxySetup = appSrc + '/setupProxy.js'
paths.testsSetup = appSrc + '/setupTests'
paths.appNodeModules = appNodeModules
paths.servedPath = homepage ? getServedPath(homepage) : '/'
paths.publicUrl = homepage || ''

module.exports = paths