Question about async/await and subscribe() usage

[terradek]

Could you please tell me how to use subsctiber.subscribe()
I am facing with fails using this function, even with examples from the repository.
For example the test.js
Fails with the below error.
As I understand there are some issues with sleep(). Because it starts throwing these errors when 2 messages already received successfully.
But I don't understand where the sleep functions should be applied. And the other question, can I use async/await with the xk6-nats functions?

And one more question - is this possible to add some functionality to get stats from the nats server just like it was implemented in nats monitoring?

Thank you!

INFO[0002] {"1the message":{"raw":[49,116,104,101,32,109,101,115,115,97,103,101],"data":"1the message","topic":"test","header":{}}}  source=console
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
running panic: runtime error: invalid memory address or nil pointer dereference [recovered]
constantpanic: runtime error: invalid memory address or nil pointer dereference [recovered]5h0m0s  100000.00 iters/s
        panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xad1191]

goroutine 248 [running]:
github.com/dop251/goja.(*Runtime).runWrapped.func1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2517 +0x185
panic({0x2b9ef20, 0x51abf80})
        runtime/panic.go:884 +0x213
github.com/dop251/goja.(*vm).handleThrow(0xc0031e0000, {0x2b9ef20, 0x51abf80})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:788 +0x497
github.com/dop251/goja.(*vm).try.func1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:807 +0x45
panic({0x2b9ef20, 0x51abf80})
        runtime/panic.go:884 +0x213
github.com/dop251/goja.(*vm).handleThrow(0xc0031e0000, {0x2b9ef20, 0x51abf80})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:788 +0x497
github.com/dop251/goja.(*vm).runTryInner.func1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:830 +0x45
panic({0x2b9ef20, 0x51abf80})
        runtime/panic.go:884 +0x213
github.com/dop251/goja.(*Runtime).runWrapped.func1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2517 +0x185
panic({0x2b9ef20, 0x51abf80})
        runtime/panic.go:884 +0x213
github.com/dop251/goja.(*vm).handleThrow(0xc0031e0000, {0x2b9ef20, 0x51abf80})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:788 +0x497
github.com/dop251/goja.(*vm).try.func1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:807 +0x45
panic({0x2b9ef20, 0x51abf80})
        runtime/panic.go:884 +0x213
github.com/dop251/goja.(*vm).handleThrow(0xc0031e0000, {0x2b9ef20, 0x51abf80})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:788 +0x497
github.com/dop251/goja.(*vm).runTryInner.func1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:830 +0x45
panic({0x2b9ef20, 0x51abf80})
        runtime/panic.go:884 +0x213
github.com/dop251/goja.(*vm).run(0xc0031e0000)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:579 +0xb1
github.com/dop251/goja.(*vm).runTryInner(0xc0031e0000?)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:834 +0x70
github.com/dop251/goja.(*baseJsFuncObject).__call(0xc00468c7e0, {0xc002456fb0?, 0x1, 0x30?}, {0x0?, 0x0}, {0x0?, 0x0?})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:426 +0x705
github.com/dop251/goja.(*baseJsFuncObject)._call(...)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:442
github.com/dop251/goja.(*arrowFuncObject).Call(0x4043c5?, {{0x37116a8, 0x5228a60}, {0xc002456fb0, 0x1, 0x1}})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:386 +0x57
github.com/dop251/goja.AssertFunction.func1.1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2477 +0x77
github.com/dop251/goja.(*vm).try(0xc0031e0000, 0xc003a4a798)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:811 +0x244
github.com/dop251/goja.(*Runtime).runWrapped(0xc000f00400, 0x7f8bdb46e358?)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2521 +0x7c
github.com/dop251/goja.AssertFunction.func1({0x37116a8?, 0x5228a60?}, {0xc002456fb0?, 0xc00302ca98?, 0x13?})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2476 +0x92
go.k6.io/k6/js/modules/k6.(*K6).Check(0xc000d8eca0, {0x3710ac8?, 0xc003548ab0}, {0x3710ac8, 0xc004ec0060}, {0x5228fc0, 0x0, 0x4d6cbe?})
        go.k6.io/k6@v0.46.0/js/modules/k6/k6.go:195 +0x3fe
reflect.Value.call({0x2b93e80?, 0xc000d8ecb0?, 0x7f8bdb6dbbf8?}, {0x30102b2, 0x4}, {0xc004ec01e0, 0x2, 0x0?})
        reflect/value.go:586 +0xb0b
reflect.Value.Call({0x2b93e80?, 0xc000d8ecb0?, 0xc004ec0060?}, {0xc004ec01e0?, 0xc002456e20?, 0x7f8bdb8388e8?})
        reflect/value.go:370 +0xbc
github.com/dop251/goja.(*Runtime).wrapReflectFunc.func1({{0x37116a8, 0x5228a60}, {0xc001a7a4e0, 0x2, 0x12}})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2057 +0x3dc
github.com/dop251/goja.(*nativeFuncObject).vmCall(0xc0034cf500, 0xc0031e0000, 0x2)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:559 +0x1af
github.com/dop251/goja.call.exec(0x11?, 0xc0031e0000)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:3366 +0x6a
github.com/dop251/goja.(*vm).run(0xc0031e0000)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:582 +0x62
github.com/dop251/goja.(*vm).runTryInner(0xc0031e0000?)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:834 +0x70
github.com/dop251/goja.(*baseJsFuncObject).__call(0xc00107e620, {0xc00274b360?, 0x1, 0xc0036dd520?}, {0x0?, 0x0}, {0x0?, 0x0?})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:426 +0x705
github.com/dop251/goja.(*baseJsFuncObject)._call(...)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:442
github.com/dop251/goja.(*arrowFuncObject).Call(0xc00337f7c0?, {{0x37116a8, 0x5228a60}, {0xc00274b360, 0x1, 0x1}})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/func.go:386 +0x57
github.com/dop251/goja.AssertFunction.func1.1()
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2477 +0x77
github.com/dop251/goja.(*vm).try(0xc0031e0000, 0xc0036dd718)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/vm.go:811 +0x244
github.com/dop251/goja.(*Runtime).runWrapped(0xc000f00400, 0x7f8bdb4c18b8?)
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2521 +0x7c
github.com/dop251/goja.AssertFunction.func1({0x37116a8?, 0x5228a60?}, {0xc00274b360?, 0xc001b7a160?, 0xa9?})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2476 +0x92
github.com/dop251/goja.(*Runtime).wrapJSFunc.func1({0xc0010e8930, 0x1, 0x8?})
        github.com/dop251/goja@v0.0.0-20230828202809-3dbe69dd2b8e/runtime.go:2285 +0x185
github.com/ydarias/xk6-nats.(*Nats).Subscribe.func1(0xc0025fad90)
        github.com/ydarias/xk6-nats@v0.0.0-20230914104427-9af1a8411f14/nats.go:160 +0x255
github.com/nats-io/nats%2ego.(*Conn).waitForMsgs(0xc001288700, 0xc0027c0f70)
        github.com/nats-io/nats.go@v1.28.0/nats.go:3001 +0x442
created by github.com/nats-io/nats%2ego.(*Conn).subscribeLocked
        github.com/nats-io/nats.go@v1.28.0/nats.go:4232 +0x3f8```