TypeError: Cannot read property 'bind' of undefined, when using webpack to build the project with workerpool dependency.

The project is build using webpack to make single js file. However when using webpack, it throws the error,

node_modules\workerpool\src\worker.js:49
    worker.send = process.send.bind(process);
                               ^
TypeError: Cannot read property 'bind' of undefined
    at Object.<anonymous> (node_modules\workerpool\src\worker.js:49:32)
    at Module._compile (internal/modules/cjs/loader.js:1201:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1221:10)
    at Module.load (internal/modules/cjs/loader.js:1050:32)
    at Function.Module._load (internal/modules/cjs/loader.js:938:14)
    at Module.require (internal/modules/cjs/loader.js:1090:19)
    at require (internal/modules/cjs/helpers.js:75:18)
    at Object.worker (node_modules\workerpool\src\index.js:20:16)

Referring to #170, the issue is when building with webpack. Without building with webpack the code works absolutely fine. Considering the example,

const workerpool = require('workerpool');

// create a worker pool using an external worker script
const pool = workerpool.pool(__dirname + '/myWorker.js');

// run registered functions on the worker via exec
pool.exec('fibonacci', [10])
    .then(function (result) {
      console.log('Result: ' + result); // outputs 55
    })
    .catch(function (err) {
      console.error(err);
    })
    .then(function () {
      pool.terminate(); // terminate all workers when done
    });

It does make sense that, using webpack, it will try to convert all js file to one main.js file. When trying to run myWorker.js, Since the file is not in /dist folder after build, It may look like the error would be File not Found. However to my great surprise, the error was is

node_modules\workerpool\src\worker.js:49
    worker.send = process.send.bind(process);
                               ^
TypeError: Cannot read property 'bind' of undefined
...so on

Any explain regarding this behaviour, I wonder if it is unable to spawn child process.

One way to fix the issue is to exclude the myWorker.js from webpack building it, and moving the myWorker.js to /dist folder.

However I would like to know if we can include myWorker.js with webpack.

josdejong / workerpool

TypeError: Cannot read property 'bind' of undefined, when using webpack to build the project with workerpool dependency. #327