vue vue-cli3 modify the date-picker Source node_modules introduced in the element-ui error exports is not defined

Error Description:

1. Copy node_modules / element-ui / packages / date-picker in the files to your project in

 ---------》》》》》》》

 

2. Run npm run serve error exports is not defined

 

solution:

1. Modify babel.config.js

module.exports = {
  presets: [
    ['@vue/app', {
      useBuiltIns: 'entry'  //添加
    }]
  ]
}

Add in 2.main.js

import '@babel/polyfill'

Add in 3.babel.config.js

module.exports = {
    
    transpileDependencies:[
        'element-ui'
    ],
    
};

 

 Other refer to the official website: https://cli.vuejs.org/zh/guide/browser-compatibility.html#browserslist