解决懒加载的副作用

index.js

document.addEventListener('click', () => {
  import(/* webpackPrefetch: true */ 'lodash').then(({ default: { join } }) => {
    console.log(join([1, 2, 3], '-'))
  })
    
  import(/* webpackPreload: true */ 'lodash').then(({ default: { join } }) => {
    console.log(join([1, 2, 3], '-'))
  })
})