CODEWITHSUNDEEP
javascriptnode.jsnpmwebpackwebpack-hmr
John Doe
John Doe

Reputation: 3671

Invalid HMR message error Webpack

I'm getting the following error from Webpack:

Invalid HMR message Followed by a string of very detailed JSON.

There really aren't any resources that I can find to better debug this. Any tips?

Webpack console errors

Bonus if anyone can give me insight to why require can't be found when it's used throughout the app no problem.

Here are some details:

NPM dependencies:

  "dependencies": {
    "babel-core": "^6.7.2",
    "babel-polyfill": "^6.7.4",
    "body-parser": "~1.12.0",
    "cookie-parser": "~1.3.4",
    "css-modules-require-hook": "^4.0.0",
    "cuid": "^1.3.8",
    "debug": "~2.1.1",
    "express": "~4.12.2",
    "fs": "0.0.2",
    "react": "^0.14.7",
    "react-dom": "^0.14.7",
    "react-redux": "^4.4.1",
    "react-router": "^2.0.1",
    "redux": "^3.3.1",
    "serve-favicon": "~2.2.0",
    "webpack": "^1.12.13"
  },
  "devDependencies": {
    "babel-eslint": "^5.0.0",
    "babel-loader": "^6.2.4",
    "babel-plugin-react-transform": "^2.0.2",
    "babel-polyfill": "^6.7.4",
    "babel-preset-es2015": "^6.6.0",
    "babel-preset-react": "^6.5.0",
    "babel-preset-react-hmre": "^1.1.1",
    "babel-register": "^6.7.2",
    "cross-env": "^1.0.7",
    "css-modules-require-hook": "^4.0.0",
    "eslint": "^2.6.0",
    "redux-devtools": "^3.1.1",
    "redux-devtools-dock-monitor": "^1.1.0",
    "redux-devtools-log-monitor": "^1.0.4",
    "webpack-dev-middleware": "^1.5.1",
    "webpack-hot-middleware": "^2.10.0"
  }

Webpack config:

var webpack = require('webpack');
var path = require('path');
var fs = require('fs');

  var nodeModules = {};
fs.readdirSync('node_modules')
  .filter(function(x) {
    return ['.bin'].indexOf(x) === -1;
  })
  .forEach(function(mod) {
    nodeModules[mod] = 'commonjs ' + mod;
  });

module.exports = {
  devtool: 'cheap-source-map',

  entry: ['webpack-hot-middleware/client',
          './index.js',
  ],
  target: 'node',
  output: {
    path: __dirname,
    filename: 'bundle.js',
  },

  resolve: {
    extensions: ['', '.js', '.jsx'],
  },

  module: {
    loaders: [
      {
        test: /\.css$/,
        loader: 'style!css?modules',
      },
      {
        test: /\.jsx*$/,
        exclude: [/node_modules/, /.+\.config.js/],
        loader: 'babel',
        query: {
          presets: ['react-hmre'],
        },
      },
    ],
  },

  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.DefinePlugin({
      'process.env': {
        CLIENT: JSON.stringify(true)
      }
    })
  ],

  externals: nodeModules

};

Upvotes: 23

Views: 4255

Answers (2)

adamrights
adamrights

Reputation: 1731

Set your target from node to web for the client.js.

If you are bundling a server side React app, you can add to the top of server file:

require('css-modules-require-hook')({
  generateScopedName: '[name]--[local]',
  prepend: []
});

So that the css-files required in SSR react components work.

Upvotes: 1

Rob Brander
Rob Brander

Reputation: 3771

You will want to set target to 'web' because your intention is to compile for the web.

You should set the engine to node (which is what I'm assuming you were trying to do using target).

target: "web",
engines: {
  node: "4.x"
},

Upvotes: 0

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