kuailelunwen_new_houtai/babel.config.js

module.exports = {
  presets: [
    ['@vue/cli-plugin-babel/preset', { 
      useBuiltIns: 'usage',
      corejs: 3,
      targets: {
        ie: '10',
        chrome: '58',
        firefox: '60',
        safari: '11',
        edge: '16'
      }
    }]
  ],
  plugins: [
    '@babel/plugin-proposal-class-properties',
    '@babel/plugin-proposal-optional-chaining',
    '@babel/plugin-transform-runtime'
  ]
}