React应用在Edge 38.14393.0.0中无法运行：Object.defineProperty语法错误求助

Hey there, let's break down why your React app is throwing that syntax error in ancient Edge 38, and how to fix it. That error on Object.defineProperty(webpack_exports, "__esModule", { value: true }); isn't actually about Object.defineProperty itself (Edge 38 supports that ES5 feature) — it's a red flag that your code isn't being fully transpiled to ES5, which is the only language version this old browser understands.

Here's what you can do to resolve this:

• Lock your Babel config to target Edge 38 explicitly
  Since you're using Babel 6 (with babel-polyfill@6.26.0), make sure your .babelrc is set to transpile for this specific Edge version. Add or update your presets to target older browsers:

  {
    "presets": [
      ["es2015", { "targets": { "edge": "38" } }],
      "react"
    ]
  }
  

  This tells Babel to convert all ES6+ syntax (like let, const, arrow functions) that Edge 38 can't handle into ES5 equivalents.

• Double-check the babel-polyfill import order
  Polyfills need to load before any other code that uses the APIs they provide. Make sure your index.js starts with:

  import "babel-polyfill";
  // Only then import React, your components, etc.
  import React from 'react';
  import ReactDOM from 'react-dom';
  import App from './App';
  

  If you're using a CDN for polyfills, add that <script> tag before your bundle's <script> tag in index.html.

• Ensure Webpack is transpiling all necessary code
  Sometimes dependencies in node_modules are shipped with ES6 code, which your Babel setup might be excluding. Update your Webpack config's babel-loader to include these dependencies if needed (be selective to avoid slowing down builds):

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        loader: 'babel-loader',
        exclude: /node_modules\/(?!(some-es6-dependency)\/)/,
        include: [path.resolve(__dirname, 'src'), path.resolve(__dirname, 'node_modules/some-es6-dependency')]
      }
    ]
  }
  

• Try a more explicit polyfill setup
  Instead of relying on babel-polyfill, import the specific core-js and regenerator runtime modules directly (since babel-polyfill@6 is just a wrapper around these):

  import 'core-js/es6';
  import 'regenerator-runtime/runtime';
  

  This can sometimes resolve edge cases where the bundled polyfill isn't loading correctly.

The key issue here is that babel-polyfill only adds missing JavaScript APIs — it doesn't transpile syntax. You need both proper syntax transpilation via Babel presets and polyfills for missing APIs to support super old browsers like Edge 38.

内容的提问来源于stack exchange，提问作者TerribleDeveloper