ydd_front/mer_plat_admin/babel.config.js

module.exports = {
  presets: [
    [
      '@vue/app',
      {
        useBuiltIns: 'entry',
        polyfills: ['es6.promise', 'es6.symbol'],
      },
    ],
  ],
  plugins: ['@babel/plugin-proposal-optional-chaining'],
};