I see this error "Module not found: Error: Can't resolve 'fs' in ....." and is solution is

// webpack 4
node: {
    fs: "empty"
}


//webpack5
   resolve: {
    extensions: [".ts", ".tsx", ".js", ".css"],
    fallback: {
      fs: false,
    },
  },

However I have no idea what does "fs:false" or "empty" mean?