worker-loader essentially gives the developer a solution for getting the program to handle large computation tasks in the background. To get the loader up and running, we will take the following steps:

1. To begin with, use the command line to install worker-loader:

npm install worker-loader --save-dev

Alternatively, there is an inline way to import worker-loader from the App.js file. In this file, which is present in any Webpack project directory, make the following amendment, if it hasn't been done already:

import Worker from 'worker-loader!./Worker.js';

2. Once you have imported the loader, perform a configuration using webpack.config.js:

{
 module: {
  rules: [
  {
   test: /.worker.js$/,
   use: { 
      loader: 'worker-loader' 
      }
    }
   ]
  }
 }

use refers to the configuration needed to allow access to the loader.

3. Write the following code in App.js to allow this file to be an export location for the loader:

import Worker from './file.worker.js';
const worker = new Worker();
worker.postMessage({ a: 1 });
worker.onmessage = function (event) {};
worker.addEventListener("message", function (event) {});

The preceding code also adds an event listener to allow testing later in the development console.

4. Finally, run Webpack via your preferred method to see the results:

npm run build

You should see worker-loader installed and imported from App.js if you chose that method. This can be observed in the console window or by viewing the page source.

This gives you a couple of choices for utilizing worker-loader, either through the command-line utility or through the configuration of the App.js file. Next, we'll discuss coffee-loader.