Webpack运行插件脚本

我有一个处理应用程序文件的插件&css。

webpack.config.js文件

const path = require('path');
const glob = require('glob');
const uglify = require("uglify-js");
const cleanCSS = require("clean-css");
const merge = require('webpack-merge-and-include-globally');

const mode = 'dev';
const ext = mode === 'prod' ? '.min' : ''; 

module.exports = (event, arg) => {  

  let config = {

  mode: mode === 'dev' ? 'development' : 'prod' ? 'production' : '',
  entry: {
    bundle : [ "./build/index.js" ] 
  }, 
  output: {
    path: __dirname + '/public',
    filename: "js/[name].js"
  },
  plugins: [
    new merge({
        files: {
          // concatenate angular app
          './app/app.js' : [ 
            './build/app/js/app.js',
            './build/app/js/controllers/*',
            './build/app/js/directives/*', 
            './build/app/js/services/*', 
          ],
          // compile scripts & css 
          './js/scripts.js' : [ './build/js/scripts.js' ],
          './css/style.css' : [ './build/css/*' ]
        },
        transform: { // minify in prod mode
        './app/app.js' : code => mode === 'prod' ? uglify.minify(code).code : code,
        './js/scripts.js' : code => mode === 'prod' ? uglify.minify(code).code : code,
        './css/style.css' : code => mode === 'prod' ? new cleanCSS({}).minify(code).styles : code
      }
  })
]
}
return config; 
}

当我跑的时候 npm run build bundle.js app.js 我的申请,还有 style.css 用我的css。

但是当我跑的时候 npm run watch webpack只监视条目文件

有没有可能表明webpack也会监视插件的入口文件?或者我可以指出构建脚本是在更改某些任意文件时触发的吗?