$RefreshReg$ is not defined code example

Example: $RefreshReg$ is not defined

hey this worked for me to handle this issue, follow this step by step

1.install cross-env
2.add cross-env NODE_ENV=production and cross-env NODE_ENV=development
3. follow this config 
```
const isDevPlugin = ['react-refresh/babel']

const isProdPlugin = [
  '@babel/plugin-transform-block-scoping',
  'transform-remove-console',
  'babel-plugin-transform-remove-undefined',
  ['transform-react-remove-prop-types', { mode: 'wrap', ignoreFilenames: ['node_modules'] }]
]

const isProdDevPlugin = [
  '@babel/plugin-transform-async-to-generator',
  '@babel/plugin-syntax-dynamic-import',
  ['@babel/plugin-proposal-class-properties', { loose: true }],
  ['@babel/plugin-transform-runtime', { corejs: 3, useESModules: true }],
  ['styled-jsx/babel', { optimizeForSpeed: true }]
]

const isPlugins = process.env.NODE_ENV !== 'production' ? isDevPlugin : isProdPlugin

 {
    test: /\.(js|jsx)$/,
    use: [
          {
            loader: 'babel-loader',
            options: {
              cacheDirectory: true,
              presets: [
                [
                  '@babel/preset-env',
                  {
                    useBuiltIns: 'usage',
                    corejs: 3,
                    loose: true,
                    bugfixes: true,
                    modules: false
                  }
                ],
                ['@babel/preset-react', { useBuiltIns: true }]
              ],
              plugins: [...isProdDevPlugin, ...isPlugins]
            }
          }
        ],
        include: resolve(process.cwd(), 'src'),
        exclude: /node_modules/
  }
```

  4. enjoy working