There was an error encountered while attempting to read the property 'webpackHotUpdate' of an undefined object

Encountering an error when the browser reaches the following line in the "webpackified" app.js file:

/******/ (function(modules) { // webpackBootstrap
/******/    function hotDisposeChunk(chunkId) {
/******/        delete installedChunks[chunkId];
/******/    }
/******/        var parentHotUpdateCallback = this["webpackHotUpdate"];

The error is generated because this is undefined in the last line of this snippet.

Despite this error message, the application appears to be running smoothly.

Uncertain about which parts of my webpack.config.js are relevant, below are some possibly useful excerpts:

webpack.config.js

const HotModuleReplcement = new webpack.HotModuleReplacementPlugin();

...

module.exports = {

  ...

  devServer: {
    historyApiFallback: true,
    hot: true,
    inline: true,
    port: 8000,
    open: true,
    proxy: [{
      context: ['/assets', '/api'],
      target: 'http://localhost:4000',
      secure: false
    }]
  },
  plugins: [HotModuleReplcement, HtmlWebpack]
};

Any insights on what might be causing this issue?

Answer №1

The main issue here lies in the fact that instead of using "this", it should be "self" for webpages, as opposed to node environments.

It is crucial that the webpack.config.js does not look like this:

output: {
    path: 'dist',
      filename: '[name].js',
      publicPath: '/',
      globalObject: 'this' // avoid using "this"
  },

Instead, consider configuring it more like this:

output: {
    path: 'dist',
      filename: '[name].js',
      publicPath: '/',
      globalObject: 'self'
  },

Find out more on webpack.js.org

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