webpack-ready-plugin.js

function WebpackReadyPlugin(options) {
  this.filepath = options.filepath;
}

WebpackReadyPlugin.prototype.apply = function(compiler) {
  const filepath = this.filepath;
  compiler.plugin('done', function() {
    console.log('touching ' + filepath + ' at ' + new Date());
    fs.closeSync(fs.openSync(filepath, 'w'));
  });
};