Passing k6 options crashes the test

Hello,

Running the pub/sub test with options crashes the test. Below is the output:

./k6 run --duration 10s --vus 10 scripts/test.js

...

  execution: local
     script: scripts/test.js
     output: -

  scenarios: (100.00%) 1 scenario, 10 max VUs, 40s max duration (incl. graceful stop):
           * default: 10 looping VUs for 10s (gracefulStop: 30s)

panic: TypeError: Not a function: [object Object] at file:///home/mike/projects/github/k6-nats-example/scripts/test.js:19:4(2)
running (03.0s), 10/10 VUs, 10 complete and 0 interrupted iterations
goroutine 159 [running]:-------------------------] 10 VUs  03.0s/10s
github.com/dop251/goja.(*Runtime).wrapJSFunc.func1({0xc0021e9980, 0x1, 0x4})
        github.com/dop251/goja@v0.0.0-20220110113543-261677941f3c/runtime.go:2161 +0x525
github.com/ydarias/xk6-nats.(*Nats).Subscribe.func1(0xc000b562a0)
        github.com/ydarias/xk6-nats@v0.0.0-20211125102117-532fa12d017c/nats.go:73 +0x47
github.com/nats-io/nats%2ego.(*Conn).waitForMsgs(0xc0005c3200, 0xc002233740)
        github.com/nats-io/nats.go@v1.13.1-0.20220121202836-972a071d373d/nats.go:2677 +0x442
created by github.com/nats-io/nats%2ego.(*Conn).subscribeLocked
        github.com/nats-io/nats.go@v1.13.1-0.20220121202836-972a071d373d/nats.go:3897 +0x3f1

I've tested this in Windows and Ubuntu WSL2 running the latest version go version go1.17.8 linux/amd64.

Here's the source code:

import { check, sleep } from "k6";
import { Nats } from "k6/x/nats";

const natsConfig = {
  servers: ["nats://localhost:4222"],
  unsafe: true,
};

const publisher = new Nats(natsConfig);
const subscriber = new Nats(natsConfig);

// export const options = {
//   duration: "10s",
//   vus: 10,
// };

export default function () {
  subscriber.subscribe("topic", (msg) => {
    check(msg, {
      "Is expected message": (m) => m.data === "the message",
      "Is expected topic": (m) => m.topic === "topic",
    });
  });

  sleep(1);

  publisher.publish("topic", "the message");

  sleep(1);
}

export function teardown() {
  publisher.close();
  subscriber.close();
}

Line 19 where it fails is where the check function has been declared.

Kindly assist.

ydarias / xk6-nats

Passing k6 options crashes the test #3