[JavaScript知识库]babel7 + corejs2升级

webpack.config.js中
entry:
babel-polyfill
改为
@babel/polyfill

app: ['@babel/polyfill', path.join(process.cwd(), 'src/main.js')],

module.rules中，对js的处理

function resolve(dir) {
  return path.join(process.cwd(), dir);
}

const initBabelInclude = [
  resolve('src'),
  resolve('test'),
  resolve('node_modules/pl-table'),
  resolve('node_modules/vue-awesome'),
  resolve('node_modules/element-ui/src/'),
  resolve('node_modules/bpmn-js-properties-panel'),
];
// module.rules中对js处理内容
      {
        test: /\.js$/,
        loader: 'babel-loader',
        include: babelInclude,
      },

移除.babelrc文件，新增babel.config.js文件 // 使用js来配置，这是重点??！！！

module.exports = {
  presets: [
    ['@babel/preset-env',
      {
        useBuiltIns: 'usage',
        corejs: 2,
      },
    ],
    '@vue/babel-preset-jsx',
  ],
  plugins: [
    ['import', {
      libraryName: 'antd',
      libraryDirectory: 'lib',
    }],
  ],
};