CODEWITHSUNDEEP
javascriptnode.jswebpack
Thomas Wagenaar
Thomas Wagenaar

Reputation: 6749

How to include a worker/process file with webpack

I have a file that creates child processes, the code is similar to this:

var cp = require('child_process');

function process () {
  return cp.fork('./worker');
}

module.exports(process);

But ./worker doesn't seem to be included in the bundle. Which causes the following error when running the process function:

Error: Cannot find module 'C:\Users\USER\Documents\GitHub\PROJECT\worker'
    at Function.Module._resolveFilename (module.js:485:15)
    at Function.Module._load (module.js:437:25)
    at Function.Module.runMain (module.js:605:10)
    at startup (bootstrap_node.js:158:16)
    at bootstrap_node.js:575:3
module.js:487
    throw err;
    ^

How can I make sure worker files are bundled as well? I want my whole project in óne file.

Upvotes: 4

Views: 886

Answers (1)

Mukesh Soni
Mukesh Soni

Reputation: 6668

There is a possible workaround. You can copy all your worker files into the dist directory. Let us say you have all your worker files in a workers directory. And so your above code changes a little (includes worker.js from workers direcotory).

var cp = require('child_process');
function process () {
  return cp.fork('./workers/worker');
}

module.exports(process);

And to copy the workers folder to your build/dist folder, you can use copy-webpack-plugin. In your case the plugin can be used like this in the webpack config file.

var CopyWebpackPlugin = require('copy-webpack-plugin')

module.exports = {

// your configuration for entry and output will be different, of course entry: './main.js', output: { filename: 'dist/bundle.js' }, target: 'node', plugins: [ new CopyWebpackPlugin([ { from: 'workers', to: 'dist/workers' } ]) ] }

Your bundle will still not have the worker.js file, but the reference will work for fork method.

Upvotes: 4

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