Incorporate a Web Worker into your webpack library for enhanced performance

I am facing an issue while attempting to include a web worker in my custom npm package.

[App] -> [my npm package -> load worker]

Within the npm package, I am utilizing worker-loader to import the worker file:

import Worker from 'worker-loader!./myPackage.worker';
const worker = new Worker(); 

The webpack configuration inside the local npm package looks like this:

{
 entry: './packages/myPackage/src/index.ts',
  output: {
    library: 'myPackage',
    libraryTarget: 'umd',
    path: path.resolve(__dirname, './packages/myPackage/dist'),
    filename: "index.js"
  },
  module: {
    rules: [
      { 
        test: /\.tsx?$/,
        loader: "ts-loader"
      },
      {
        test: /\.worker\.js$/,
        loader: 'worker-loader',
        options: {
          inline: "no-fallback"
      }
      },
    ]
  },        
}

However, I am encountering an issue where my app is unable to find the worker file. It is looking for the worker at ./static/js/myPackage.worker.js, but the file cannot be located, resulting in an error message of

Uncaught SyntaxError: Unexpected token '<'
.

I need the worker file to be bundled with the npm package so that no additional files are required. How can I accomplish this?

Answer №1

Recently encountered the same issue myself, and given the timing of your post, I'm assuming you're working with Webpack5.

To address this, I would recommend reordering your rules and ensuring that they are matching correctly. Additionally, if you are using react-native, be sure to confirm that workers can be utilized.

If you prefer not to create an extra file, consider utilizing the inline option for the worker (there is also a TypeScript guide available). Keep in mind that you will need to use no-fallback as the value for the inline option to avoid creating a separate file.

If the inline option is not suitable, explore the possibilities of module federation and dynamic public path. If these options do not work, consider utilizing import.meta.resolve or developing a plugin that can replace paths in the code after resolving them in the Webpack dependency graph.

The inline option is quite effective, but hopefully, these suggestions will assist you if that approach does not meet your needs.

Best regards,
Chance

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