fix webpack config

Author: wangshijun

packages/react-scripts/config/webpack.config.dev.js

@@ -145,13 +145,6 @@ module.exports = {
  include: paths.appSrc,
  },
 
- // Avoid "require is not defined" errors
- {
- test: /\.mjs$/,
- include: /node_modules/,
- type: 'javascript/auto',
- },
-
  {
  // "oneOf" will traverse all following loaders until one will
  // match the requirements. When no loader matches it will fall

packages/react-scripts/config/webpack.config.prod.js

@@ -153,13 +153,6 @@ module.exports = {
  include: paths.appSrc,
  },
 
- // Avoid "require is not defined" errors
- {
- test: /\.mjs$/,
- include: /node_modules/,
- type: 'javascript/auto',
- },
-
  {
  // "oneOf" will traverse all following loaders until one will
  // match the requirements. When no loader matches it will fall