TypeError: Worker is not a constructor

[Xiryl]

Hi,
I'm using the library with the worker options, using the onResponse as file module as said on the documentation:

const runWrkPOST = (connections, pipelining, duration, title) => {
  const instance = autocannon(
    {
      url: 'http://localhost:3000',
      duration: 2,
      title,
      workers: 2,
      headers: {
        'Content-type': 'application/json; charset=utf-8',
      },
      requests: [
        {
          method: 'POST',
          path: '/api/v1/k/push/example',
          onResponse: path.join(__dirname, 'helpers', 'on-response'),
        },
      ],
    },
    (err, result) => console.log(result),
  );
  autocannon.track(instance, {
    renderProgressBar: true,
    renderResultsTable: true,
    renderLatencyTable: true,
  });
};

where in ./helpers/on-response.js:

const fastJson = require('fast-json-stringify');

module.exports = (client, statusCode, resBytes, responseTime) => {
  const stringify = fastJson({
    title: 'Message Schema',
    type: 'object',
    properties: {
      message: {
        type: 'string',
      },
    },
  });
  client.setHeaders({ 'Content-type': 'application/json; charset=utf-8' });
  client.setBody(
    stringify({
      message: `RESTAPI,datatype=Double,unit=°C ATemp=19.19 ${new Date().getTime()}000000`,
    }),
  );
};

But I'm getting the following error:

/Users/fabio/projects/internal/test/test/node_modules/autocannon/lib/manager.js:69
      const worker = new Worker(path.resolve(__dirname, './worker.js'), { workerData: { opts: workerOpts } })
                     ^

TypeError: Worker is not a constructor
    at init (/Users/fabio/projects/internal/test/test/node_modules/autocannon/lib/manager.js:69:22)
    at initWorkers (/Users/fabio/projects/internal/test/test/node_modules/autocannon/lib/manager.js:107:3)
    at _init (/Users/fabio/projects/internal/test/test/node_modules/autocannon/lib/init.js:57:5)
    at init (/Users/fabio/projects/internal/test/test/node_modules/autocannon/lib/init.js:13:10)
    at Object.runWrkPOST (/Users/fabio/projects/internal/test/test/src/bapi.js:61:20)
    at Object.<anonymous> (/Users/fabio/projects/internal/test/test/index.js:22:6)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)

---

I also tried to install the autocannon globally and run to check if the problem is in my code, but I'm getting the same error:

fabio@mbp-fabio test % autocannon -c 100 -d 5 -p 10 -w 2  http://localhost:3000/api/v1/status
worker_threads is not available
(node:25183) UnhandledPromiseRejectionWarning: TypeError: Worker is not a constructor
    at init (/usr/local/lib/node_modules/autocannon/lib/manager.js:69:22)
    at initWorkers (/usr/local/lib/node_modules/autocannon/lib/manager.js:107:3)
    at _init (/usr/local/lib/node_modules/autocannon/lib/init.js:57:5)
    at Promise (/usr/local/lib/node_modules/autocannon/lib/init.js:24:7)
    at new Promise (<anonymous>)
    at _init (/usr/local/lib/node_modules/autocannon/lib/init.js:23:21)
    at init (/usr/local/lib/node_modules/autocannon/lib/init.js:13:10)
    at start (/usr/local/lib/node_modules/autocannon/autocannon.js:232:5)
    at Object.<anonymous> (/usr/local/lib/node_modules/autocannon/autocannon.js:259:3)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
(node:25183) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:25183) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Am I forgetting something to use the workers options correctly?
Thanks

---

I'm running from MAC OS 11.0.1 (Big Sur) and node v10.16.3

[salmanm]

You'll need to use Node 11.7.0+ to be able to use workers.

But it should show the readable error message.

[Xiryl]

Oh good, I have to update node, my bad!
Thank you @salmanm

[Xiryl]

Updating to v14.15.4 work like a charm.
Thanks

[salmanm]

Reopening as the library should print an error message