Module not found: Can't resolve 'fs' code example

Example 1: Error: Can't resolve 'fs' webpack

node: {
  fs: 'empty'
}

Example 2: Module not found: Can't resolve 'react'

npm install react
npm install react-dom

Example 3: node require fs not found

module.exports = {
  webpack: (config, { isServer }) => {
    // Fixes npm packages that depend on `fs` module
    if (!isServer) {
      config.node = {
        fs: 'empty'
      }
    }

    return config
  }
}