A custom WebPack 4 plugin for removing generated JS files that aren't needed.

nojs.webpack.js

function() {
  // Custom webpack plugin - remove generated JS files that aren't needed
  this.hooks.done.tap( 'webpack', function( stats ) {
    stats.compilation.chunks.forEach( chunk => {
      if (!chunk.entryModule._identifier.includes( '.js' )) {
        chunk.files.forEach( file => {
          if (file.includes( '.js' )) {
            fs.unlinkSync( path.join( __dirname, `/${file}` ) );
          }
        } );
      }
    } );
  } );
}