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ReferenceError regeneratorRuntime is not defined #9849

xuchenchenBoy opened this Issue Apr 12, 2019 · 1 comment


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commented Apr 12, 2019

I'm building an SSR template, and when I use @babebl/register and then execute webpack (config), the system reported an error.
I tried @babel/polyfill and @babel/plugin-transform-runtime, but none of them worked.

Input code


  ignore: [/\/(build|node_modules)\//],
  presets: ["@babel/preset-env", "@babel/preset-react"],
  plugins: ["@babel/plugin-syntax-dynamic-import", "dynamic-import-node"]


const config = require('../config/')
const webpack = require('webpack')
const express = require('express')
const webpackDevMiddleware = require('webpack-dev-middleware') 
const reactRouter = require('react-router')
const StaticRouter = reactRouter.reactRouter;
const app = express()
const complier = webpack(config)
const PORT = 8090
app.use(webpackDevMiddleware(complier, {
  publicPath: config.output.publicPath

app.listen(PORT , function() {
  console.log(`SSR running on port ${PORT }`);

const paths = require('./paths')
const webpack = require('webpack')
const htmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: ['webpack-hot-middleware/client?reload=true', paths.appIndexJs],
  output: {
    path: paths.clientBuild,
    filename: '[name].bundle.js',
    chunkFilename: '[name].bundle.js',
    publicPath: paths.publicPath
  devtool: 'eval-source-map',
  module: {
    rules: [
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: {
          presets: [
            ['@babel/preset-env', { 
              useBuiltIns: 'usage', 
              corejs: "2",  
              targets: {
                  browsers: ['last 2 versions', 'ie >= 9'],
  resolve: {
    extensions: ['.js', '.jsx']
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new htmlWebpackPlugin({
      template: './client/index.html',
      filename: 'index.html'

Error message



  • Babel version(s): 7.4.3
  • Node/npm version: [e.g. Node 10.15.3/npm 6.4.1]
  • OS: window 10

Rep (Please execute npm run dev:server and release notes in server.js)


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commented Apr 12, 2019

Hey @xuchenchenBoy! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
that typically always has someone willing to help. You can sign-up here
for an invite.

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