module.exports = {
  presets: [
    // https://github.com/vuejs/vue-cli/tree/master/packages/@vue/babel-preset-app
    '@vue/cli-plugin-babel/preset', '@babel/preset-env'
  ],
  'env': {
    'development': {
      // babel-plugin-dynamic-import-node plugin only does one thing by converting all import() to require().
      // This plugin can significantly increase the speed of hot updates, when you have a large number of pages.
      'plugins': ['dynamic-import-node',]
    }
  },
  plugins: [
    [
      'import',
      {
        libraryName: 'vant',
        libraryDirectory: 'es',
        style: true,
      },
      'vant',
    ],
    '@babel/plugin-proposal-optional-chaining',
    '@babel/plugin-proposal-nullish-coalescing-operator'
  ],
}

// module.exports = {
//   presets: [
//     '@vue/babel-preset-jsx',
//     [
//       '@babel/preset-env',
//       {
//         'useBuiltIns': 'entry',
//         'corejs': 3
//       }
//     ]
//   ],
//   'env': {
//     'development': {
//       'plugins': ['dynamic-import-node']
//     }
//   }
// }