@babel/plugin-proposal-export-default-from/lib/index.js

Compile export default to ES2015

import { declare } from '@babel/helper-plugin-utils';
import { types } from '@babel/core';

const index = declare(api => {
  api.assertVersion("^7.0.0-0 || ^8.0.0");
  return {
    name: "proposal-export-default-from",
    manipulateOptions: (_, parser) => parser.plugins.push("exportDefaultFrom"),
    visitor: {
      ExportNamedDeclaration(path) {
        const {
          node
        } = path;
        const {
          specifiers,
          source
        } = node;
        if (!types.isExportDefaultSpecifier(specifiers[0])) return;
        const {
          exported
        } = specifiers.shift();
        if (specifiers.every(s => types.isExportSpecifier(s))) {
          specifiers.unshift(types.exportSpecifier(types.identifier("default"), exported));
          return;
        }
        path.insertBefore(types.exportNamedDeclaration(null, [types.exportSpecifier(types.identifier("default"), exported)], types.cloneNode(source)));
      }
    }
  };
});

export { index as default };
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