CopyWebpackPlugin-webpack plug-in, syntax is as follows

new CopyWebpackPlugin([{ from: '**/*', to: 'relative/path/to/dest/' }
    { from: '**/*', to: '/absolute/path/to/dest/' }
  ], options)

// copy custom static assets
new CopyWebpackPlugin([
  {
    from: path.resolve(__dirname, '../static'),
    to: config.dev.assetsSubDirectory,
    ignore: ['.*']
  },
  // dist
  {
    from: path.join(__dirname, '../*.txt'),
    to: path.join(__dirname, '../dist/')
  }
])

can be deleted by direct verification. There is no need to keep it in the root directory

if it is 3.0, configure it in config.js.