Error trying to use the webworker with a function that returns a promise

[capkverna]

Hello,
I need to use the webworker to run a function that communicates with a rest api. I tried some ways, but its not working.
That's what i tried:

this._webWorkerService.run(this.searchNotifications, params).then((retorno: any) => {
console.log('retorno', retorno);
this._webWorkerService.terminate();
});

searchNotifications(params: any) {
return new Promise((resolve, reject) => {
let xhr = new XMLHttpRequest();
xhr.open('POST', params.url);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.setRequestHeader('Accept', 'application/json');
xhr.setRequestHeader('Authorization', 'Bearer ' + params.tokenAuthorization);
xhr.onload = () => {
resolve(xhr.response);
};
xhr.onerror = () => {
reject(xhr.response);
};
xhr.send(JSON.stringify(params.filter));
});
}

And that's the error:

core.js:15724 ERROR Error: Uncaught (in promise): ErrorEvent: {"isTrusted":true}
at resolvePromise (zone.js:814)
at resolvePromise (zone.js:771)
at zone.js:873
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:421)
at Object.onInvokeTask (core.js:17290)
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:420)
at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:188)
at drainMicroTaskQueue (zone.js:595)
at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:500)
at invokeTask (zone.js:1540)