babel 配置

module.exports = function (api) {
  api.cache(true);
  return {
    presets: [
      [
        "@babel/preset-env",
        {
          modules: false,
          useBuiltIns: "entry", //entry  usage
          corejs: 3,
          loose: true, //宽松模式  https://babeljs.io/docs/en/babel-preset-env#loose
          targets: {
            browsers: ["ie >= 8"],
          },
        },
      ],
    ],
    plugins: [
      /**
       * @babel/plugin-transform-runtime
       * 暂时不能使用 与@babel/plugin-transform-proto-to-assign组件不兼容   详情https://github.com/babel/babel/issues/11997
       * @babel/plugin-transform-runtime 会自动引入regenerator   若使用当前插件需要把common.js里的 import 'regenerator-runtime/runtime'; 注释掉
       */
      // ["@babel/plugin-transform-runtime", { helpers: false }],
      "@babel/plugin-proposal-class-properties",
      "@babel/plugin-transform-modules-commonjs", // Cannot assign to read only property 'exports' of object '#<Object>'
      "@babel/plugin-syntax-export-default-from",
      "@babel/plugin-proposal-export-default-from",
      "@babel/plugin-transform-proto-to-assign", //https://babeljs.io/docs/en/caveats#classes-10-and-below fix IE<=10 静态属性不支持继承的bug     有问题的页面地址 http://localhost:8057/activity/intra
    ],
  };
};