TODO REMIND PLUGIN

基本的 Plugin 架構

實現 Hello-World-Plugin

function HelloWorldPlugin(options) {
  this.options = options
}

HelloWorldPlugin.prototype.apply = function(compiler) {
  compiler.plugin('done', function() {
    console.log('Hello World!');
  })
  
  compiler.plugin("compilation", function(compilation) {
    console.log(compilation.assets)
    compilation.plugin("optimize", function() {
      console.log("Assets are being optimized.");
    });
 });
}