Error: rawValue is undefined in comlink-loader

[rezaerami]

hello everyone.
I'm using the comlink-loader in ReactJS to load a class and call a function in off-thread.
it's a very basic function, only returns the given value (I'm gonna use it later to call API in off-thread), but I'm getting this error: Error: rawValue is undefined

here is my worker:

`//@todo: use writelog later to call API
// import { writeLog } from 'constants/Helpers/logHelpers';

export class LogWorker {
// offThreadLog: payload => writeLog(payload),
async offThreadLog(payload) {
return payload;
}
}`

and this is how I loaded and called it

`//some imports
import LogWorker from 'comlink-loader!constants/Workers/log.worker';
// some other imports

const Hoc = () => {
useEffect(() => {
const logWorker = new LogWorker();
window.addEventListener('click', async () => {
const response = await logWorker.offThreadLog({
medium: 'HOC',
detail: 'off thread log',
action: 'click',
});
console.log(response);
});
}, []);
}

export default Hoc;`
I also tried the example in docs, but the same error happened.
thanks.

[rezaerami]

I also should add when I use anormal function it works whti no problem
instead of using class i used below code.
export const offThreadLog = payload => { return payload; }