将文件标记为 side-effect-free(无副作用)

const path = require('path');
module.exports = {  entry: './src/index.js',  output: {    filename: 'bundle.js',    path: path.resolve(__dirname, 'dist'),  }, mode: 'development', optimization: {   usedExports: true, },};

document.title = "改标题";export function getTitle() {  console.log("getTitle");}

import './title.js'console.log('hello world')

(()=>{"use strict";document.title="改标题",console.log("hello world")})();

(()=>{"use strict";console.log("hello world")})();

html,body {  background: red;}

import './index.css'
console.log('hello world')

(()=>{"use strict";console.log("hello world")})();

sideEffects:["*.css"]