Exclude in Babel

I build complicated application by webpack+babel. Obviously, it uses some well-known libraries as dependencies. Usually, those libraries are already packed, so we don’t need to process them, just import/require and use.

That’s why it’s handy to exclude such a dependency from processing by babel. See a rule below. We just exclude all files from node_modules.

      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loaders: [
          'babel-loader'
        ]
      }

There would be more complicated configuration. E.g., we use our own common library as dependency. In this case we need to include files from such a source into loader. One of approaches is to add exception for the module into regexp.

  {
    test: /\.jsx?$/,
    exclude: /node_modules[\\\/](?!common[\\\/])/,
    loaders: [
      'babel-loader',
    ]
  }

It looks too messy and weired. Regexp becomes unreadable. There is better approach below.

  exclude: {
    test: path.resolve(__dirname, "node_modules"),
    exclude: path.resolve(__dirname, "node_modules/common")
  },

Happy building!